ListView/Adapter is not displaying the last item

ListView/Adapter is not displaying the last item - java

this is a small application which asks some questions and then it will show answers. When we finish answering all the questions, new activity appears and shows us the all the answers except the last one. I searched this problem and saw answers but none of them is working in my case. Thanks for any kind of help.
This is my code:
XML code for the main layout.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.itrio.iqtest.Result_QA"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Answers"
android:textSize="22sp"
android:textStyle="bold"
android:layout_margin="20dp"/>
<ListView
android:id="#+id/result_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</ListView>
</LinearLayout>
Another XML custom view.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:padding="10dp">
<TextView
android:id="#+id/question_result"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:textSize="18sp"
android:textStyle="bold">
</TextView>
<View
android:layout_width="match_parent"
android:layout_height="10dp"/>
<TextView
android:textStyle="italic"
android:id="#+id/answer_result"
android:layout_width="fill_parent"
android:textSize="18sp"
android:layout_marginBottom="10dp"
android:layout_height="wrap_content">
</TextView>
</LinearLayout>
Here's the code for questions:
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Collections;
public class Genius extends AppCompatActivity {
private TextView question_view;
private Button mNext;
int currentQ = 0;
RadioGroup genius_rg;
RadioButton op1, op2, op3, op4,checked;
private int score;
int turns=0;
boolean check= false, shuffle = true;
String[] questions = new String[8];
String[] answers = new String[8];
//Keys
private static final String Question_Index_key = "Index value of Questions";
private static final String Checked_Radio = "Selected radio Button";
private static final String Is_Radio_Checked = "ISC";
private static final String Do_Not_Shuffle_Again = "Dont' shuffle";
public static final String Result_Questions = "questions to display at result activity";
public static final String Result_Answers = "answers to display at result activity";
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt(Question_Index_key,currentQ);
outState.putInt(Checked_Radio,genius_rg.getCheckedRadioButtonId());
outState.putBoolean(Is_Radio_Checked,check);
outState.putBoolean(Do_Not_Shuffle_Again, shuffle);
}
#Override
public void onBackPressed() {
super.onBackPressed();
Dialog alert_exit = new QuizExitAlert(Genius.this);
alert_exit.show();
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
//Changes 'back' button action
if (keyCode == KeyEvent.KEYCODE_BACK) {
Dialog alert_exit = new QuizExitAlert(Genius.this);
alert_exit.show();
}
return true;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_genius);
if (savedInstanceState != null) {
currentQ = savedInstanceState.getInt(Question_Index_key);
if (savedInstanceState.getBoolean(Is_Radio_Checked)) {
checked = (RadioButton) findViewById(savedInstanceState.getInt(Checked_Radio));
checked.setChecked(true);
}
shuffle = savedInstanceState.getBoolean(Do_Not_Shuffle_Again);
}
question_view = (TextView) findViewById(R.id.question_genius);
genius_rg = (RadioGroup) findViewById(R.id.radio_genius);
op1 = (RadioButton) findViewById(R.id.g_op1);
op2 = (RadioButton) findViewById(R.id.g_op2);
op3 = (RadioButton) findViewById(R.id.g_op3);
op4 = (RadioButton) findViewById(R.id.g_op4);
Collections.shuffle(bank);
question_view.setText(bank.get(currentQ).getQ());
op1.setText(bank.get(currentQ).getOp1());
op2.setText(bank.get(currentQ).getOp2());
op3.setText(bank.get(currentQ).getOp3());
op4.setText(bank.get(currentQ).getOp4());
mNext = (Button) findViewById(R.id.next_genius);
mNext.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
turns++;
if (turns >= 8) {
new AlertDialog.Builder(Genius.this)
.setTitle("Done!!!")
.setMessage("You have answered all the questions.")
.setPositiveButton("Submit", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Intent result = new Intent(Genius.this,Result_QA.class);
result.putExtra(Result_Questions, questions);
result.putExtra(Result_Answers, answers);
startActivity(result);
}
}).show();
}else {
if (op1.isChecked() || op2.isChecked() || op3.isChecked() || op4.isChecked()) {
checked = (RadioButton) findViewById(genius_rg.getCheckedRadioButtonId());
if (bank.get(currentQ).getAns() == checked.getText()) {
score += 10;
}
questions[currentQ] = bank.get(currentQ).getQ();
answers[currentQ] = bank.get(currentQ).getAns();
genius_rg.clearCheck();
currentQ++;
question_view.setText(bank.get(currentQ).getQ());
op1.setText(bank.get(currentQ).getOp1());
op2.setText(bank.get(currentQ).getOp2());
op3.setText(bank.get(currentQ).getOp3());
op4.setText(bank.get(currentQ).getOp4());
} else {
Toast.makeText(Genius.this, "Select an option to proceed", Toast.LENGTH_SHORT).show();
}
}
}
});
}
}
Here's the code for LisView Activity:
import android.os.Bundle;
import android.app.Activity;
import android.widget.ListView;
public class Result_QA extends Activity {
ListView result;
ReslutListViewAdapter reslutListViewAdapter;
String[] ques, ans;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result__q);
Bundle b= getIntent().getExtras();
ques = b.getStringArray(new Genius().Result_Questions);
ans = b.getStringArray(new Genius().Result_Answers);
result = (ListView) findViewById(R.id.result_view);
reslutListViewAdapter = new ReslutListViewAdapter(this, ques, ans);
System.out.println("adapter => "+reslutListViewAdapter.getCount());
result.setAdapter(reslutListViewAdapter);
}
}
Code for ListViewAdapter class:
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class ReslutListViewAdapter extends BaseAdapter {
Activity context;
String[] questions;
String[] answers;
public ReslutListViewAdapter(Activity con, String[] ques, String[] ans){
super();
context = con;
questions = ques;
answers = ans;
}
#Override
public int getCount() {
return questions.length;
}
private class ViewHolder {
TextView mQ;
TextView mA;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null)
{
convertView = inflater.inflate(R.layout.result_listadapter, null);
holder = new ViewHolder();
holder.mQ = (TextView) convertView.findViewById(R.id.question_result);
holder.mA = (TextView) convertView.findViewById(R.id.answer_result);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder) convertView.getTag();
}
holder.mQ.setText(questions[position]);
holder.mA.setText(answers[position]);
return convertView;
}
}

First of all listview is old one Recyclerview had came, which makes our work easier and lot more improvements have been done in RecyclerView to make developer work easier.
Coming to this issue, ListView doesn't support wrap_content. So change the height and width of ListView to match_parent. Then in adapter xml file the parent layout height should be wrap_content, but you have mentioned it as match_parent, so change that also to wrap_content. Hopefully, this should solve your problem. If the above solution didn't work, then try by removing the padding and margin in the adapter XML layout(from the parent layout in result_listadapter.xml file).
FYI fill_parent is deprecated and we are supposed to use match_parent instead of that. So avoid using the fill_parent.
Hope this helps:)

Related

How to create a new card after taking input from dialog box

Basically on clicking a button a dialog box opens from which I am capturing information. Once I click on "Done" option present in the Dialog box, I want a new card to be created comprising of that information. I have implemented recycler view for achieving the above but for some reason it is not working. Could someone tell me what's wrong?
Here's the code of my Adapter
package com.example.android.teleconsultation_doctor;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
public class AdapterManageSlots extends RecyclerView.Adapter<AdapterManageSlots.ManageSlotsViewHolder> {
private ArrayList<CardViewManageSlots> mManageSlots;
public static class ManageSlotsViewHolder extends RecyclerView.ViewHolder{
public TextView mSlots, mTiming;
public ManageSlotsViewHolder(#NonNull View itemView) {
super(itemView);
mTiming = itemView.findViewById(R.id.textViewTimingValue);
mSlots = itemView.findViewById(R.id.textViewSlotValue);
}
}
public AdapterManageSlots(ArrayList<CardViewManageSlots> manageSlots){
mManageSlots = manageSlots;
}
#NonNull
#Override
public ManageSlotsViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.cardview_manage_slots, viewGroup, false);
ManageSlotsViewHolder evh = new ManageSlotsViewHolder(v);
return evh;
}
#Override
public void onBindViewHolder(#NonNull ManageSlotsViewHolder manageSlotsViewHolder, int i) {
CardViewManageSlots currentItem = mManageSlots.get(i);
manageSlotsViewHolder.mSlots.setText(currentItem.getSlot());
manageSlotsViewHolder.mTiming.setText(currentItem.getTiming());
}
#Override
public int getItemCount() {
return mManageSlots.size();
}
}
Here is the JAVA code of the activity
package com.example.android.teleconsultation_doctor;
import android.app.AlertDialog;
import android.app.DatePickerDialog;
import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import java.text.DateFormat;
import java.util.ArrayList;
import java.util.Calendar;
public class ManageSlots extends AppCompatActivity implements DatePickerDialog.OnDateSetListener, AdapterView.OnItemSelectedListener {
ImageView imageViewCalender;
TextView textViewDateValue;
String date, spinnerSlotValue, spinnerEndTimeValue, spinnerStartTimeValue;
Button buttonAddSlot;
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_manage_slots);
ArrayList<CardViewManageSlots> slotDetails = new ArrayList<>();
imageViewCalender = findViewById(R.id.imageViewCalander);
textViewDateValue = findViewById(R.id.textViewDateValue);
buttonAddSlot = findViewById(R.id.buttonAddSlot);
imageViewCalender.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
showDatePickerDialog();
}
});
buttonAddSlot.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
AlertDialog.Builder mBuilder = new AlertDialog.Builder(ManageSlots.this);
View mView = getLayoutInflater().inflate(R.layout.dialog_manage_slots, null);
Spinner mSpinnerSlots = mView.findViewById(R.id.spinnerSlots);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(ManageSlots.this, android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.slot_names));
adapter.setDropDownViewResource(R.layout.support_simple_spinner_dropdown_item);
mSpinnerSlots.setAdapter(adapter);
spinnerSlotValue = mSpinnerSlots.getSelectedItem().toString();
Spinner mSpinnerStartTime = mView.findViewById(R.id.spinnerStartTime);
ArrayAdapter<String> adapter1 = new ArrayAdapter<String>(ManageSlots.this, android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.time));
adapter1.setDropDownViewResource(R.layout.support_simple_spinner_dropdown_item);
mSpinnerStartTime.setAdapter(adapter1);
spinnerStartTimeValue = mSpinnerStartTime.getSelectedItem().toString();
Spinner mSpinnerEndTime = mView.findViewById(R.id.spinnerEndTime);
ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(ManageSlots.this, android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.time));
adapter2.setDropDownViewResource(R.layout.support_simple_spinner_dropdown_item);
mSpinnerEndTime.setAdapter(adapter2);
spinnerEndTimeValue = mSpinnerEndTime.getSelectedItem().toString();
mBuilder.setPositiveButton("Done", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
//Toast.makeText(ManageSlots.this, "Slot Created!" + spinnerSlotValue + spinnerEndTimeValue + spinnerStartTimeValue, Toast.LENGTH_LONG).show();
dialogInterface.dismiss();
}
});
mBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
mBuilder.setView(mView);
AlertDialog dialog = mBuilder.create();
dialog.show();
}
});
String finalTime = spinnerStartTimeValue + "-" + spinnerEndTimeValue;
Toast.makeText(this, finalTime, Toast.LENGTH_SHORT).show();
slotDetails.add(new CardViewManageSlots(spinnerSlotValue,finalTime));
//slotDetails.add(new CardViewManageSlots("Morning","diwwodmw"));
mRecyclerView = findViewById(R.id.recyclerViewSlots);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mAdapter = new AdapterManageSlots(slotDetails);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setAdapter(mAdapter);
}
private void showDatePickerDialog() {
DatePickerDialog datePickerDialog = new DatePickerDialog(
this,
this,
Calendar.getInstance().get(Calendar.YEAR),
Calendar.getInstance().get(Calendar.MONTH),
Calendar.getInstance().get(Calendar.DAY_OF_MONTH)
);
datePickerDialog.show();
}
#Override
public void onDateSet(DatePicker datePicker, int i, int i1, int i2) {
int i3=i1;
i3=i3+1;
date = i2 + "/" + i3 + "/" + i;
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR,i);
cal.set(Calendar.MONTH,i1);
cal.set(Calendar.DAY_OF_MONTH,i2);
String selectedDate = DateFormat.getDateInstance().format(cal.getTime());
textViewDateValue.setText(selectedDate);
}
#Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
}
#Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
}
Here is the XML code of the activity
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ManageSlots">
<include
layout="#layout/toolbar_layout"
android:id="#+id/mytoolbar"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Select Date:"
android:id="#+id/textViewSelectDate"
android:layout_below="#id/mytoolbar"
android:layout_margin="10dp"
android:textSize="20dp"
android:textColor="#000"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/imageViewCalander"
android:src="#drawable/round_today_black_18dp_2x"
android:layout_toRightOf="#id/textViewSelectDate"
android:layout_below="#id/mytoolbar"
android:layout_marginTop="5dp"
android:clickable="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textViewDateValue"
android:layout_below="#id/imageViewCalander"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:textSize="20dp"
android:text="Aug 21, 2020"
android:textColor="#000"
/>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/textViewDateValue"
android:id="#+id/recyclerViewSlots"
android:padding="4dp"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/buttonAddSlot"
android:text="Add Slot"
android:layout_alignParentBottom="true"
android:layout_margin="10dp"
android:background="#color/colorPrimaryDark"
android:textColor="#fff"/>
</RelativeLayout>

If I understand it correctly, you want something like this:
mBuilder.setPositiveButton("Done", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
spinnerSlotValue = mSpinnerSlots.getSelectedItem().toString();
spinnerStartTimeValue = mSpinnerStartTime.getSelectedItem().toString();
spinnerEndTimeValue = mSpinnerEndTime.getSelectedItem().toString();
String finalTime = spinnerStartTimeValue + "-" + spinnerEndTimeValue;
slotDetails.add(new CardViewManageSlots(spinnerSlotValue,finalTime));
mAdapter.notifyDataSetChanged();
dialogInterface.dismiss();
}
});

how to open link when user click on Text ( Click Here To See Full Topic )?

I develop (NEWS Android app) with android studio and I have a problem, I Post a Short topic in the app and I need to let the user see the full topic when clicks on TextView (Click Here), but I need to change the site link on every topic. Anyone can help me, please ??
I Update the news through (Firebase Database and Online Database)
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.util.Base64;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import com.squareup.picasso.Picasso;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
public class Home extends AppCompatActivity {
RequestQueue requestQueue;
String url = "https://mobarmejlebanon.000webhostapp.com/show.php";
TextView textView;
ListView listview;
ArrayList<listitme> listitmes = new ArrayList<listitme>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
textView = (TextView) findViewById(R.id.textView);
listview = (ListView) findViewById(R.id.listview);
requestQueue = Volley.newRequestQueue(this);
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("allstudents");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject respons = jsonArray.getJSONObject(i);
String id = respons.getString("id");
String name = respons.getString("name");
String info = respons.getString("info");
String img = respons.getString("img");
listitmes.add(new listitme(id, name, info, img));
listAllItme();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e("VOLLEY", "ERROR");
}
}
);
requestQueue.add(jsonObjectRequest);
}
public void listAllItme() {
listAdpter lA = new listAdpter(listitmes);
listview.setAdapter(lA);
}
class listAdpter extends BaseAdapter {
ArrayList<listitme> listA = new ArrayList<listitme>();
public listAdpter(ArrayList<listitme> listA) {
this.listA = listA;
}
#Override
public int getCount() {
return listA.size();
}
#Override
public Object getItem(int position) {
return listA.get(position).id;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater layoutInflater = getLayoutInflater();
View view = layoutInflater.inflate(R.layout.row_item, null);
TextView id = (TextView) view.findViewById(R.id.textView_id);
TextView name = (TextView) view.findViewById(R.id.textView_name);
TextView info = (TextView) view.findViewById(R.id.textView_info);
ImageView img = (ImageView) view.findViewById(R.id.image);
id.setText(listA.get(position).id);
name.setText(listA.get(position).name);
info.setText(listA.get(position).info);
Picasso.with(Home.this).load("https://mobarmejlebanon.000webhostapp.com/images/" + listA.get(position).img).into(img);
return view;
}
}
}
Here is the Firebase database code
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
public class Topic2 extends AppCompatActivity {
TextView TopicTitle,Topic;
FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();
DatabaseReference mRootReference = firebaseDatabase.getReference();
DatabaseReference mKidRefernece = firebaseDatabase.getReference("topictwotitle");
DatabaseReference mChildReference = mRootReference.child("topictwomessage");
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_topic2);
TopicTitle = (TextView) findViewById(R.id.twotitle);
Topic = (TextView) findViewById(R.id.twomsg);
TopicTitle.setText("Please Wait");
Topic.setText("Loading");
}
#Override
protected void onStart() {
super.onStart();
mChildReference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String message = dataSnapshot.getValue(String.class);
Topic.setText(message);
mKidRefernece.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String topictitle = dataSnapshot.getValue(String.class);
TopicTitle.setText(topictitle);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}

I suggest you to use CardView and RecyclerView in order to achieve your purpose. You can get a better insight of it here:
Also you can catch a glimpse of it in action here and hither.
EDIT
According to the new query regarding this question; I think you must catch up this How to get a text after clicking on the CardView.
Happy Coding...

EDIT
Here is your sample:
I added dummy right now.
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayList<TopicDTO> topics = new ArrayList<>();
for (int i = 0; i < 10; i++) {
topics.add(new TopicDTO("" + i, "Topic " + (i + 1), "Your Topic info goes here", "Your Topic Image goes here", "http://www.google.com"));
}
ListView listTopics = (ListView) findViewById(R.id.listTopics);
listTopics.setAdapter(new TopicsListAdapter(MainActivity.this, topics));
}
}
TopicsListAdapter.java
public class TopicsListAdapter extends BaseAdapter {
private LayoutInflater mInflater;
private ArrayList<TopicDTO> mData;
public TopicsListAdapter(Context context, ArrayList<TopicDTO> data) {
mInflater = LayoutInflater.from(context);
mData = data;
}
#Override
public int getCount() {
return mData.size();
}
#Override
public Object getItem(int position) {
return mData.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ChildViewHolder holder;
if (convertView == null) {
holder = new ChildViewHolder();
convertView = mInflater.inflate(R.layout.row_topics, parent,
false);
holder.textTopicTitle = (TextView) convertView
.findViewById(R.id.textTopicTitle);
holder.textTopicInfo = (TextView) convertView
.findViewById(R.id.textTopicInfo);
holder.textTopicLink = (TextView) convertView
.findViewById(R.id.textTopicLink);
convertView.setTag(holder);
} else {
holder = (ChildViewHolder) convertView.getTag();
}
final TopicDTO mItem = mData.get(position);
holder.textTopicTitle.setText(mItem.name);
holder.textTopicInfo.setText(mItem.info);
/*You need to have a more info link per topic*/
holder.textTopicLink.setClickable(true);
holder.textTopicLink.setMovementMethod(LinkMovementMethod.getInstance());
String text = "<a href='" + mItem.moreInfoLink + "'> Click here to see full topic </a>";
holder.textTopicLink.setText(Html.fromHtml(text));
return convertView;
}
class ChildViewHolder {
TextView textTopicTitle, textTopicInfo, textTopicLink;
}
}
row_topics.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="horizontal">
<ImageView
android:layout_width="50dp"
android:layout_height="50dp"
android:src="#drawable/ic_launcher" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/textTopicTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/textTopicInfo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp" />
</LinearLayout>
</LinearLayout>
<!--You need to add extra TextView in your row file of listview.
It will work as a link per topic.-->
<TextView
android:id="#+id/textTopicLink"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="right"
android:text="Click here to see full topic" />
</LinearLayout>
Read each comment carefully and then implement it. That's it. Nothing can be better than this.
OLD
You need to have a textView for each topic you have.You have something like listview or recyclerview. Then when user clicks on that textView open link associated with that topic only that is from your dataset of listview.
Try this on your textview on which you want to open a link :
info.setClickable(true);
info.setMovementMethod(LinkMovementMethod.getInstance());
String text = "<a href='http://www.google.com'> Google </a>";
info.setText(Html.fromHtml(text));
Replace "http://www.google.com" with your topic's link.

java.lang.NullPointerException: Android Studio

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
I am getting a NullPointerException at line 67 while trying to set a listView with a chat adapter. Here is the class:
I have placed ** around the line I am getting the NullPointerException on. I'm not really understading why its returning as null when I'm setting messageAdapter to a new object of an inner class called ChatAdapter(this).
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MessageListActivity extends AppCompatActivity {
/**
* Whether or not the activity is in two-pane mode, i.e. running on a tablet
* device.
*/
ListView listView;
Button sendButton;
ArrayList<String> arrayList = new ArrayList<String>();
ChatDatabaseHelper Cdb;
private boolean mTwoPane;
ChatAdapter messageAdapter = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_message_list);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
toolbar.setTitle(getTitle());
listView = (ListView)findViewById(R.id.chatListView);
final EditText editText = (EditText)findViewById(R.id.messageText);
sendButton = (Button)findViewById(R.id.sendButton);
messageAdapter = new ChatAdapter(this); // chatAdapter is a built in adapater
**listView.setAdapter(messageAdapter);**
Cdb = new ChatDatabaseHelper(this);
Cursor cursor = Cdb.getMessages(); // get messages method is of type Cursor from database helper class
// cursor will move through the database to find the next text if there is any.
while (cursor.moveToNext()) { arrayList.add(cursor.getString(cursor.getColumnIndex(Cdb.KEY_MESSAGE))); }
sendButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) { // on click listener for the send button
String chatText = editText.getText().toString(); // changing editText to String
arrayList.add(chatText); // adding the string from EditTest to arrayList
boolean isInserted = Cdb.insertData(chatText); // inserting the message text into the database
if(isInserted = true)
{ Toast.makeText(MessageListActivity.this,"Message Sent",Toast.LENGTH_SHORT).show(); } // if the message inserts into the database this toast will show
else {
Toast.makeText(MessageListActivity.this,"Message not Sent",Toast.LENGTH_SHORT).show(); } // if message does not nter the database this toast will show
messageAdapter.notifyDataSetChanged(); // notifying the adapter that a message has been sent, changing from incoming to outgoing
editText.setText(" "); // set the text on the send button to blank.
} // end of onClick view
}); // end of onClickListener
if (findViewById(R.id.message_detail_container) != null) {
// The detail container view will be present only in the
// large-screen layouts (res/values-w900dp).
// If this view is present, then the
// activity should be in two-pane mode.
mTwoPane = true;
}
}
class ChatAdapter extends ArrayAdapter<String> { // custom adapter class // when youc all the adapter it forms the for loop for you.
public ChatAdapter(MessageListActivity ctx) {
super(ctx, 0);
} // default constructor
// method to return the number of rows that will be in your array
// will tell how many times to run a for loop
public int getCount(){ return arrayList.size(); } // will return the size of the array
public String getItem(int position){ return arrayList.get(position); } // will return the item at position
// getview method
#Override
public View getView(int position, final View convertView, ViewGroup parent) {// inner class
LayoutInflater Inflater = MessageListActivity.this.getLayoutInflater(); // an inflater inflates the xml layout into a view.
View result = null;
if(position%2 == 0){ // if position number in the array is odd do this, if number is even, do this.
result = Inflater.inflate(R.layout.chat_row_incoming, null); // depending on the position, show layout incoming
} else {
result = Inflater.inflate(R.layout.chat_row_outgoing,null); // depending on the position, show layout outgoing
}
TextView message = (TextView)result.findViewById(R.id.messageText); // creating a message of type TextView connected to messageText
final String messageText = getItem(position) ;
message.setText(messageText);
result.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (mTwoPane) {
Bundle arguments = new Bundle();
arguments.putString(MessageDetailFragment.ARG_ITEM_ID,messageText );
MessageDetailFragment fragment = new MessageDetailFragment();
fragment.setArguments(arguments);
getSupportFragmentManager().beginTransaction()
.replace(R.id.message_detail_container, fragment)
.commit();
} else {
Context context = v.getContext();
Intent intent = new Intent(context, MessageDetailActivity.class);
intent.putExtra(MessageDetailFragment.ARG_ITEM_ID,messageText );
context.startActivity(intent);
}
}
});
return result; // return the view which is the Inflater.
}
} // end of chat adapter class
private void setupRecyclerView(#NonNull RecyclerView recyclerView) {
recyclerView.setAdapter(new SimpleItemRecyclerViewAdapter(DummyContent.ITEMS));
}
public class SimpleItemRecyclerViewAdapter
extends RecyclerView.Adapter<SimpleItemRecyclerViewAdapter.ViewHolder> {
private final List<DummyContent.DummyItem> mValues;
public SimpleItemRecyclerViewAdapter(List<DummyContent.DummyItem> items) {
mValues = items;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.message_list_content, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(final ViewHolder holder, int position) {
holder.mItem = mValues.get(position);
holder.mIdView.setText(mValues.get(position).id);
holder.mContentView.setText(mValues.get(position).content);
holder.mView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (mTwoPane) {
Bundle arguments = new Bundle();
arguments.putString(MessageDetailFragment.ARG_ITEM_ID, holder.mItem.id);
MessageDetailFragment fragment = new MessageDetailFragment();
fragment.setArguments(arguments);
getSupportFragmentManager().beginTransaction()
.replace(R.id.message_detail_container, fragment)
.commit();
} else {
Context context = v.getContext();
Intent intent = new Intent(context, MessageDetailActivity.class);
intent.putExtra(MessageDetailFragment.ARG_ITEM_ID, holder.mItem.id);
context.startActivity(intent);
}
}
});
}
#Override
public int getItemCount() {
return mValues.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public final View mView;
public final TextView mIdView;
public final TextView mContentView;
public DummyContent.DummyItem mItem;
public ViewHolder(View view) {
super(view);
mView = view;
mIdView = (TextView) view.findViewById(R.id.id);
mContentView = (TextView) view.findViewById(R.id.content);
}
#Override
public String toString() {
return super.toString() + " '" + mContentView.getText() + "'";
}
}
}
xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.ChatWindow">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/chatListView"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
android:layout_alignParentBottom="false"
android:layout_alignWithParentIfMissing="false"
android:layout_above="#+id/sendButton" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sendButton"
android:id="#+id/sendButton"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:singleLine="true" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/messageText"
android:layout_toStartOf="#id/sendButton"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:enabled="true"
/>
</RelativeLayout>

just try
messageAdapter = new ChatAdapter(MessageListActivity .this);

EditText losing content after scrolling in RecyclerView

I'm having an issue that I have not been able to solve for a couple weeks now. I have an app that adds two EditTexts and one CheckBox on button click. However, whenever I type some content in the EditTexts, and then scroll down, the content disappears when I scroll back up. I cannot figure out a fix for this. I have found a few other very similar posts, however I have tried all solutions I can find, but none have seemed to do the trick for me yet. Here are a couple similar posts I found:
EditText loses content on scroll in ListView
Saving EditText content in RecyclerView
I've recently done some changes to my program in attempt to fix this as well. I added an ArrayList to my MainActivity and passed it to my adapter. I also made two custom text listeners in which onTextChanged, I add the string to the ArrayList. Then, in onBindViewHolder, I update the position in the text listeners, then set the text to the String in the ArrayList at that position. However, this is giving some strange errors. Now, when I add content to an EditText and scroll down, it adds it to multiple EditTexts, and even changes the content in some of them. I'm not sure how to go about fixing this.
Also, on another note, I have the app enabled for drag and drop and swipe to dismiss. So please take that into account as well if you have a solution. Thank you!
MainActivity
import android.content.ClipData;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private ArrayList<ListItems> itemsList;
private RecyclerView mRecyclerView;
private MyRecyclerAdapter adapter;
private List<String> courseStrings = new ArrayList<>();
private List<String> creditStrings = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
courseStrings.add("");
creditStrings.add("");
// Toast variable in order to fix toast queueing issue.
final Toast toast = Toast.makeText(MainActivity.this, "", Toast.LENGTH_SHORT);
// For the recycler view.
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
final LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
itemsList = new ArrayList<>();
adapter = new MyRecyclerAdapter(MainActivity.this, itemsList, courseStrings, creditStrings);
mRecyclerView.setAdapter(adapter);
mRecyclerView.setLayoutManager(linearLayoutManager);
// For the addCourse button.
final Button addCourse = (Button) findViewById(R.id.addCourse);
addCourse.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
adapter.createListItem(new ListItems(null, null, false), toast);
toast.setText("New course added");
toast.show();
}
});
final Button clearAll = (Button) findViewById(R.id.clearAll);
clearAll.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// In order to clear the list.
if (itemsList.size() == 0) {
toast.setText("All courses have already been cleared.");
toast.show();
} else {
adapter.clearAdapter();
toast.setText("All courses have been cleared.");
toast.show();
}
}
});
// For the drag and drop/swipe to dismiss.
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(
new ItemTouchHelper.SimpleCallback(ItemTouchHelper.UP | ItemTouchHelper.DOWN,
ItemTouchHelper.LEFT) {
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
final int fromPos = viewHolder.getAdapterPosition();
final int toPos = target.getAdapterPosition();
Collections.swap(itemsList, fromPos, toPos);
adapter.notifyItemMoved(fromPos, toPos);
return true;
}
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
adapter.onItemDismiss(viewHolder.getAdapterPosition());
}
});
itemTouchHelper.attachToRecyclerView(mRecyclerView);
} // End of onCreate
} // End of MainActivity
MyRecyclerAdapter
import android.app.Activity;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.text.Editable;
import android.text.InputType;
import android.text.TextWatcher;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.view.LayoutInflater;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.RelativeLayout;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class MyRecyclerAdapter extends RecyclerView.Adapter<MyRecyclerAdapter.CustomRowViewHolder> {
private ArrayList<ListItems> itemsList;
private Context mContext;
private List<String> courseStrings;
private List<String> creditStrings;
public MyRecyclerAdapter(Context context, ArrayList<ListItems> itemsList, List<String> courseStrings, List<String> creditStrings){
this.itemsList = itemsList;
this.mContext = context;
this.courseStrings = courseStrings;
this.creditStrings = creditStrings;
}
#Override
public MyRecyclerAdapter.CustomRowViewHolder onCreateViewHolder(final ViewGroup viewGroup, int position) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.new_course_row, null);
final CustomRowViewHolder holder = new CustomRowViewHolder(v, new CoursesCustomTextListener(), new CreditsCustomTextListener());
holder.creditsText.setInputType(InputType.TYPE_CLASS_NUMBER);
holder.checkBox.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(holder.checkBox.isChecked()) {
holder.courseText.setEnabled(false);
holder.courseText.setFocusable(false);
holder.courseText.setInputType(InputType.TYPE_NULL);
holder.creditsText.setEnabled(false);
holder.creditsText.setFocusable(false);
holder.creditsText.setInputType(InputType.TYPE_NULL);
} else {
holder.courseText.setEnabled(true);
holder.courseText.setFocusable(true);
holder.courseText.setFocusableInTouchMode(true);
holder.courseText.setInputType(InputType.TYPE_CLASS_TEXT);
holder.creditsText.setEnabled(true);
holder.creditsText.setFocusable(true);
holder.creditsText.setFocusableInTouchMode(true);
holder.creditsText.setInputType(InputType.TYPE_CLASS_NUMBER);
} // End if else
}
});
return holder;
} // End of onCreateViewHolder
#Override
public void onBindViewHolder(CustomRowViewHolder holder, final int position) {
ListItems listItem = itemsList.get(position);
int focusedItem = 0;
holder.itemView.setSelected(focusedItem == position);
holder.getLayoutPosition();
holder.creditsCustomTextListener.updatePosition(position);
holder.creditsCustomTextListener.updatePosition(position);
holder.courseText.setText(courseStrings.get(position));
holder.creditsText.setText(creditStrings.get(position));
// Set listener to check box.
holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
itemsList.get(position).setIsComplete(b);
}
});
holder.checkBox.setChecked( itemsList.get(position).getIsComplete());
} // End of onBindViewHolder
public void clearAdapter() {
itemsList.clear();
notifyDataSetChanged();
} // End of clearAdapter
public int getItemCount() {
return(null != itemsList ? itemsList.size() : 0);
} // End of getItemCount
public void onItemDismiss(int position) {
itemsList.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, itemsList.size());
} // End of onItemDismiss
public void createListItem(ListItems listItem, Toast toast) {
itemsList.add(listItem);
int position = itemsList.indexOf(listItem);
notifyItemInserted(position);
} // End of createListItem
///////////////////////////////////// CustomRowViewHolder /////////////////////////////////////
public static class CustomRowViewHolder extends RecyclerView.ViewHolder {
public EditText courseText;
public EditText creditsText;
public CheckBox checkBox;
public RelativeLayout relativeLayout;
public CoursesCustomTextListener coursesCustomTextListener;
public CreditsCustomTextListener creditsCustomTextListener;
public CustomRowViewHolder(View view, CoursesCustomTextListener coursesCustomTextListener, CreditsCustomTextListener creditsCustomTextListener) {
super(view);
this.coursesCustomTextListener = coursesCustomTextListener;
this.creditsCustomTextListener = creditsCustomTextListener;
this.courseText = (EditText) view.findViewById(R.id.course);
this.creditsText = (EditText) view.findViewById(R.id.credits);
this.checkBox = (CheckBox) view.findViewById(R.id.complete);
this.relativeLayout = (RelativeLayout) view.findViewById(R.id.relLayout);
this.courseText.addTextChangedListener(coursesCustomTextListener);
this.creditsText.addTextChangedListener(creditsCustomTextListener);
}
}
////////////////////////////////// CoursesCustomTextListener //////////////////////////////////
private class CoursesCustomTextListener implements TextWatcher {
private int position;
public void updatePosition(int position) {
this.position = position;
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// No operation to perform.
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
courseStrings.add(s.toString());
}
#Override
public void afterTextChanged(Editable s) {
// No operation to perform.
}
}
////////////////////////////////// CreditsCustomTextListener //////////////////////////////////
private class CreditsCustomTextListener implements TextWatcher {
private int position;
public void updatePosition(int position) {
this.position = position;
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// No operation to perform.
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
creditStrings.add(s.toString());
}
#Override
public void afterTextChanged(Editable s) {
// No operation to perform.
}
}
} // End of MyRecyclerAdapter
ListItems
import java.util.ArrayList;
public class ListItems {
private String course;
private String credits;
private Boolean complete;
public ListItems(String mCourse, String mCredits, Boolean mComplete) {
course = mCourse;
credits = mCredits;
complete = mComplete;
}
public String getCourse() {
return course;
}
public void setCourse(String course) {
this.course = course;
}
public String getCredits() {
return credits;
}
public void setCredits(String credits) {
this.credits = credits;
}
public Boolean getIsComplete() {
return complete;
}
public void setIsComplete(Boolean complete) {
this.complete = complete;
}
} // End of ListItems
new_course_row.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/relLayout"
android:layout_margin="5dp">
<EditText
android:layout_width="130dp"
android:layout_height="wrap_content"
android:id="#+id/course"
android:hint="Enter Course ID"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textSize="16sp"
android:maxLines="1" />
<EditText
android:layout_width="115dp"
android:layout_height="wrap_content"
android:id="#+id/credits"
android:hint="Enter Credits"
android:layout_alignBottom="#+id/course"
android:textSize="16sp"
android:layout_toRightOf="#+id/course"
android:maxLines="1" />
<CheckBox
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Check if complete"
android:id="#+id/complete"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignBottom="#+id/course"
android:textSize="13sp"
android:paddingBottom="4dp"
android:paddingTop="4dp" />
</RelativeLayout>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingRight="10dp"
android:paddingLeft="10dp"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:id="#+id/rl"
tools:context=".MainActivity" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add Course"
android:id="#+id/addCourse"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:textColor="#FFF"
android:background="#drawable/my_button"
android:textSize="18dp"
android:paddingRight="5dp"
android:paddingLeft="5dp"
android:paddingTop="15dp"
android:paddingBottom="15dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Clear All"
android:id="#+id/clearAll"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:textColor="#FFF"
android:background="#drawable/my_button"
android:textSize="18dp"
android:paddingRight="5dp"
android:paddingLeft="5dp"
android:paddingTop="15dp"
android:paddingBottom="15dp"/>
<android.support.v7.widget.RecyclerView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/recycler_view"
android:layout_below="#+id/addCourse"
android:layout_marginTop="10dp"
/>
</RelativeLayout>
Thank you in advance for any help! I could REALLY use a solution!
EDIT: I've noticed now that, say I enter "aaaaaaa" in the first EditText, then it will add "a" to an EditText further down the list, then "aa" to the EditText after that one, then "aaa", "aaaa", until it reaches "aaaaaaa". Then there will be a few empty EditText's, and then it will start it over again. Here is a visual:
EDIT x2: Haven't worked on this in a while, and haven't been getting any answers. Even got the "Tumbleweed" badge for this post! Anyone have any ideas?

Though I am not quite sure but I believe this is happening because recycler view regenerates its positons . For your custom edit text you are adding the string ` #Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
courseStrings.add(s.toString());
}
for both edit texts.
In recyler view you have implemented this.courseText.addTextChangedListener(coursesCustomTextListener);
so everytime you scroll the onBind Method is called and as the position changes this must be getting called too. Hence it must be regenerating . I request you to first try
holder.courseText.setTag(position);
in onBindViewHolder().
Try it for both texts individually.If it does work then try
holder.view.setTag(position);

Expandable Listview OnClickListeners

I am creating an app in android studios that requires the user to select a child item from an expandable listview on one activity and for it to be displayed on another activity. I'm new to java and android studios and still dont understand how to do this really. If anyone has any sample code or can help that would be great, thanks!

You should use the setOnChildClickListener method from the ExpandableListView class to create a ClickListener for the list elements and then use a Intent to open the new activity. The call to set the listener should be set after you've set the adapter for the ListView.
Here there's a tutorial for using a ExpandableListView and it shows how to set a ClickListener for the elements.
And here there's the Android developer's documentation which shows how to create and open a new Activity from a button's click.

**You should use the setOnChildClickListener method from the ExpandableListView class to create a ClickListener for the list elements and then use a Intent to open the new activity. The call to set the listener should be set after you've set the adapter for the ListView and create the xml file for child and parent.child will be Expandable TextView **
**layout file**
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.elite_android.explistview1.MainActivity">
<RelativeLayout
android:id="#+id/main_number_picker_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="17dp">
<NumberPicker
android:id="#+id/main_number_picker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:text="Next" />
<TextView
android:id="#+id/main_txt_patient_count"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toLeftOf="#id/main_number_picker"
android:text="Select number of patient"
android:textColor="#color/colorAccent"
android:layout_marginLeft="80dp"/>
</RelativeLayout>
<ExpandableListView
android:id="#+id/exp_Listview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/main_number_picker_layout">
</ExpandableListView>
</RelativeLayout>
**Main Activity.java file**
package com.example.elite_android.explistview1;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.ExpandableListView;
import android.view.View.OnFocusChangeListener;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ListView;
import android.widget.NumberPicker;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.NumberPicker;
public class MainActivity extends AppCompatActivity {
ExpandableListView expandableListView;
private MyAdapter mAdapter;
ExpandableListView expand;
NumberPicker numberPicker;
private List<String> headerItems;
private ArrayList childDetails;
private HashMap<String, List<String>> childList;
private Context ctx;
EditText editText1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// get reference to the EditText
editText1 = (EditText) findViewById(R.id.child_item);
// //set the onFocusChange listener
// // editText1.setOnFocusChangeListener(editText1.getOnFocusChangeListener());
//
//// //get reference to EditText
//// editText2 = (EditText) findViewById(R.id.sequence);
//// // set the on focusChange listner
//// editText2.setOnFocusChangeListener(editText2.getOnFocusChangeListener());
//
// //Generate list View from ArrayList;
//
//
// EditText editText = (EditText) findViewById(R.id.child_item);
// editText.requestFocus();
// InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
// imm.showSoftInput(editText, InputMethodManager.SHOW_IMPLICIT);
//
//
//// editText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
// // #Override
// // public void onFocusChange(View v, boolean hasFocus) {
// // //editText.setOnFocusChangeListener();
// // return;
// // }
// //});
//
String[] numbers = new String[10];
for (int count = 0; count < 10; count++)
numbers[count] = String.valueOf(count);
numberPicker = (NumberPicker) findViewById(R.id.main_number_picker);
numberPicker.setMaxValue(numbers.length);
numberPicker.setMinValue(1);
numberPicker.setDisplayedValues(numbers);
numberPicker.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
#Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
generateListItems(newVal);
loadRecycleView();
}
});
}
private void generateListItems(int childCount) {
if (headerItems != null)
headerItems.clear();
else
headerItems = new ArrayList<>();
if (childList != null)
childList.clear();
else
childList = new HashMap();
if (childDetails == null) {
childDetails = new ArrayList();
childDetails.add("Name");
childDetails.add("Age");
childDetails.add("Gender");
}
// Put header items
for (int count = 0; count < childCount; count++) {
headerItems.add(" Parent " + count);
childList.put(headerItems.get(count), childDetails);
}
}
private void loadRecycleView() {
if (expandableListView == null) {
expandableListView = (ExpandableListView) findViewById(R.id.exp_Listview);
mAdapter = new MyAdapter(this, headerItems, childList);
expandableListView.setAdapter(mAdapter);
} else {
expandableListView.invalidate();
mAdapter.setHeaderData(headerItems);
mAdapter.setListData(childList);
mAdapter.notifyDataSetChanged();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
}
**Adapter class.java**
package com.example.elite_android.explistview1;
import android.content.Context;
import android.graphics.Color;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.NumberPicker;
import android.widget.TextView;
import android.widget.EditText;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.view.View.OnFocusChangeListener;
/**
* Created by ELITE-ANDROID on 28-02-2017.
*/
// this is provides all needs methods implementing an Expandable List VIew
public class MyAdapter extends BaseExpandableListAdapter {
// We need some Variables here so therer are some Variables here
private List<String> header_titles; // This is for Representing the HeadLine(Array list)
private HashMap<String, List<String>> child_titles; // defin the HashMap for the child item how to Represent the Parent Handing so Hash Map, need some Variables
private Context ctx;
private NumberPicker numberPicker;
EditText editText;
View view;
private static LayoutInflater inflater = null;
//for initalized for all Variables we need some Constructor
public MyAdapter(Context context, List<String> header_titles, HashMap<String, List<String>> child_titles) {
super();
this.ctx = context;
this.child_titles = child_titles;
this.header_titles = header_titles;
}
public void refreshHeader_titles(List<String> events) {
this.header_titles.clear();
this.header_titles.addAll(header_titles);
notifyDataSetChanged();
}
;
#Override
// From this Override method How to Return how many elements are the Group count like parent
public int getGroupCount() {
return header_titles.size();
}
#Override
//here the number of child items are in each heading. There are three Heading - PAtien Name ,Age, Gender
public int getChildrenCount(int groupPosition) {
// Log.d("xxx", )
return child_titles.get(header_titles.get(groupPosition)).size(); //how to Return the size of HashMap
}
#Override
public Object getGroup(int groupPosition) {
return header_titles.get(groupPosition);
}
#Override
// here how to retuen child items on the particular headings and Positions.
public Object getChild(int groupPosition, int childPosition) {
return child_titles.get(header_titles.get(groupPosition)).get(childPosition);
}
#Override
//return the groupo position
public long getGroupId(int groupPosition) {
return groupPosition;
}
#Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
#Override
public boolean hasStableIds() {
return false;
}
#Override
// Here return the Group View
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
// ListViewHolder viewHolder;
// if (view == null) {
// viewHolder = new ListViewHolder();
// LayoutInflater inflater = context.getLayoutInflater();
// view = inflater.inflate(R.layout.listitems, null, true);
// viewHolder.itmName = (TextView) view.findViewById(R.id.Item_name);
// viewHolder.itmPrice = (EditText) view.findViewById(R.id.Item_price);
// view.setTag(viewHolder);
// } else {
// viewHolder = (ListViewHolder) view.getTag();
//// loadSavedValues();
// }
// Here how to get the Heading Title here Decalered String Variables, now how to get title of heading from getGroup methods so simple call Backed Methods.
String title = (String) this.getGroup(groupPosition);
if (convertView == null) {
LayoutInflater layoutInflater = (LayoutInflater) this.ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.prent, null);
}
TextView textView = (TextView) convertView.findViewById(R.id.heading_item);
textView.setText(title); // for Heading bold style ,title
return convertView;
}
#Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
String title = (String) this.getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.child, null);
}
String cellData = child_titles.get(header_titles.get(groupPosition)).get(childPosition);
EditText childItem = (EditText) convertView.findViewById(R.id.child_item);
childItem.setHint(cellData);
childItem.setOnFocusChangeListener(new View.OnFocusChangeListener() {
#Override
public void onFocusChange(View v, boolean hasFocus) {
// Log.d("xxxx", "Has focus " + hasFocus);
if (!hasFocus) {
// int itemIndex = View.getId();
// String enteredName = ((EditText)v).getText().toString();
// selttems.put(itemIndex, enteredName);
} else {
}
return;
}
});
return convertView;
}
#Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
public void setListData(HashMap<String, List<String>> lData) {
child_titles = lData;
}
public void setHeaderData(List<String> hData) {
header_titles = hData;
}
}
**child.Xml file**
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#ffff">
<EditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/child_item"
android:textSize="25dp"
android:textStyle="bold"
android:gravity="center_vertical"
android:layout_marginLeft="10dp"/>
<!--<EditText-->
<!--android:id="#+id/sequence"-->
<!--android:layout_width="wrap_content"-->
<!--android:layout_height="wrap_content"-->
<!--android:layout_alignParentLeft="true"-->
<!--android:layout_alignParentTop="true"-->
<!--android:paddingLeft="35sp"-->
<!--android:layout_marginRight="10dp"-->
<!--android:textAppearance="?android:attr/textAppearanceMedium" />-->
</LinearLayout>
<!--This Layout File Represent the Child Items.
This Field Represent the Child Item IN the List VIew -->
**parent.Xml**
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="50dp"
android:orientation="vertical">
<TextView
android:id="#+id/heading_item"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:gravity="center_vertical"
android:textColor="#color/colorAccent"
android:textSize="25dp" />
</LinearLayout>
<!--This Layout file for Heading -Lines.-->

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

ListView/Adapter is not displaying the last item - java

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