Custom Listview activity keep crashing

Custom Listview activity keep crashing - java

So I have this custom list adapter and listview thingy and I can't seem to get it to work. I've spent a couple of days now trying to figure how to fix it. Change this change that, nothing seems to work. Any idea? thanks
MainActivity.class
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActvty";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_inventory_actvity);
Log.d(TAG, "onCreate, Started");
ListView resList = (ListView)findViewById(R.id.inListView);
resClass wood = new resClass("Wood", 10);
resClass iron = new resClass("Iron", 50);
resClass meat = new resClass("Meat", 5);
ArrayList<resClass> resArrayList = new ArrayList<>();
resArrayList.add(wood);
resArrayList.add(iron);
resArrayList.add(meat);
ResListAdapter rsAdapter = new ResListAdapter(this, R.layout.activity_inventory_actvity, resArrayList);
resList.setAdapter(rsAdapter);
}
}
resClass.class
public class resClass {
private String resType;
private int resCount;
public resClass(String resType, int resCount) {
this.resType = resType;
this.resCount = resCount;
}
public String getResType() {
return resType;
}
public void setResType(String resType) {
this.resType = resType;
}
public int getResCount() {
return resCount;
}
public void setResCount(int resCount) {
this.resCount = resCount;
}
}
ResListAdapter.class
I'm guessing there is something wrong with the adapter. But I'm not really sure.
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.ArrayList;
class ResListAdapter extends ArrayAdapter<resClass>{
private static final String TAG = "ResListAdapter";
private Context mContext;
int mResource;
public ResListAdapter( Context context, int resource, ArrayList<resClass> objects) {
super(context, resource, objects);
mContext = context;
mResource = resource;
}
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
String resType = getItem(position).getResType();
int resCount = getItem(position).getResCount();
resClass res = new resClass(resType, resCount);
LayoutInflater rsInflater = LayoutInflater.from(mContext);
convertView = rsInflater.inflate(mResource, parent, false);
TextView resTypeView = (TextView)convertView.findViewById(R.id.res_name);
TextView resCountView = (TextView)convertView.findViewById(R.id.res_count);
resTypeView.setText(resType);
resCountView.setText(Integer.toString(resCount));
return convertView;
}
}
The xml files
MainActivity
<?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="p_darkness.lonemandevelopmentstudio.com.p_darkness.MainActivity">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="8dp"
android:id="#+id/inListView"/>
</RelativeLayout>
Custom layout for the listview
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:orientation="horizontal"
android:weightSum="100"
android:layout_height="match_parent">
<TextView
android:id="#+id/res_name"
android:textColor="#000"
android:textSize="17sp"
android:layout_width="wrap_content"
android:layout_height="60dp"
android:gravity="center"
android:layout_weight="50"
android:text="res_name"
android:textAlignment="center"/>
<TextView
android:id="#+id/res_count"
android:textColor="#000"
android:textSize="15sp"
android:textAlignment="center"
android:layout_width="wrap_content"
android:layout_height="60dp"
android:gravity="center"
android:layout_weight="50"
android:text="res_count"
/>
</LinearLayout>
It's been really frustrating guys hope I can find the solution by asking this time.

Related

ListView only shows the first item from the arraylist

Previously I had crash issues due to the wrong reference to the resource files. Fixed that issue and updated this thread with the logical error that I am getting.
I am new to android and currently learning custom classes and adapter. While working I am facing a problem which is the listview shows the first arraylist item only.
I have attached the codes of the required files as well.
Working Activity
package np.com.shresthakiran.tourswoniga;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ListView;
import java.util.ArrayList;
public class KhowpaActivity extends AppCompatActivity {
ListView lvHeritageList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview_heritage);
lvHeritageList = findViewById(R.id.lvHeritage);
ArrayList<Heritages> heritageAryList = new ArrayList<>();
heritageAryList.add(new Heritages(R.drawable.ic_launcher_background,"Ngatapol", "Taumadi"));
heritageAryList.add(new Heritages(R.drawable.ic_launcher_foreground, "Dattatreya", "Taumadi"));
heritageAryList.add(new Heritages(R.drawable.ic_launcher_foreground, "Lu dhwakha", "Lyaaku"));
heritageAryList.add(new Heritages(R.drawable.ic_launcher_foreground, "55 jhyale Durbar", "Lyaaku"));
heritageAryList.add(new Heritages(R.drawable.ic_launcher_foreground, "Taleju Bhawani", "Lyaaku"));
HeritageAdapter heritageAdapter = new HeritageAdapter(KhowpaActivity.this, R.layout.heritages_row, heritageAryList);
lvHeritageList.setAdapter(heritageAdapter);
}
}
Custom Adapter
package np.com.shresthakiran.tourswoniga;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import java.util.ArrayList;
public class HeritageAdapter extends ArrayAdapter<Heritages> {
private Context mContext;
private int mResource;
public HeritageAdapter(#NonNull Context context, int resource, #NonNull ArrayList<Heritages> objects) {
super(context, resource, objects);
this.mContext = context;
this.mResource = resource;
}
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
LayoutInflater layoutInflater =LayoutInflater.from(mContext);
convertView = layoutInflater.inflate(mResource, parent, false);
ImageView ivHeritageImage = convertView.findViewById(R.id.ivHeritage);
TextView tvHeritageName = convertView.findViewById(R.id.tvHeritageName);
TextView tvHeritageAddress = convertView.findViewById(R.id.tvHeritageAddress);
ivHeritageImage.setImageResource(getItem(position).getmImageResourceId());
tvHeritageName.setText(getItem(position).getmHeritageName());
tvHeritageAddress.setText(getItem(position).getmHeritageAddress());
return convertView;
}
}
Object Class
package np.com.shresthakiran.tourswoniga;
public class Heritages {
private int mImageResourceId;
private String mHeritageName;
private String mHeritageAddress;
public Heritages(int heritageImageResourceId, String heritageName, String heritageAddress) {
this.mImageResourceId = heritageImageResourceId;
this.mHeritageName = heritageName;
this.mHeritageAddress = heritageAddress;
}
public int getmImageResourceId() {
return mImageResourceId;
}
public String getmHeritageName() {
return mHeritageName;
}
public String getmHeritageAddress() {
return mHeritageAddress;
}
}
ListView 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:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="100dp"
android:minHeight="100dp">
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/lvHeritage">
</ListView>
</RelativeLayout>
List Row XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="horizontal"
android:weightSum="100"
android:layout_margin="10dp">
<ImageView
android:id="#+id/ivHeritage"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="33.33"
android:padding="2dp"
android:text="Ngatapol"
android:layout_marginTop="7dp"
android:src="#mipmap/ic_launcher"/>
<LinearLayout
android:id="#+id/llHeritageInfo"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight="66.66"
android:padding="8dp" >
<TextView
android:id="#+id/tvHeritageName"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:textSize="18sp"
android:textStyle="bold"
android:text="Ngatapol"
android:textAppearance="?android:textAppearanceMedium"
android:padding="2dp"/>
<TextView
android:id="#+id/tvHeritageAddress"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:textSize="18sp"
android:text="Taumadi"
android:padding="2dp"/>
</LinearLayout>
</LinearLayout>

listview shows the first item only is because you have set height in heritages_row layout to match_parent which will cover the whole screen height and for the next item, you've to scroll down even if the content of the first item is not covering the whole height.
To make each row to only cover the content its displaying, use wrap_content instead of match_parent.

Intro slide helper by viewPager

i wanted to use intro slider to my App
i learned it by this video https://www.youtube.com/watch?v=byLKoPgB7yA&t=22s
I do like video tutorial but I have a problem with dots
when I slide to any page the dots(. ) will be copy and increase
where is my problem and what should I do ?
package time.one.just.show.introslyder;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Html;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private ViewPager mSlideViewPager;
private LinearLayout mDotsLayout;
private SlyderAdapter slyderAdapter;
//dots of any Slide pages
private TextView[] mDots;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSlideViewPager = findViewById(R.id.viewPager);
mDotsLayout = findViewById(R.id.dots);
slyderAdapter = new SlyderAdapter(this);
mSlideViewPager.setAdapter(slyderAdapter);
addDotsIndiccator(0);
mSlideViewPager.addOnPageChangeListener(viewListener);
}
private void addDotsIndiccator(int position) {
mDots = new TextView[3];
for (int i = 0; i < mDots.length; i++) {
mDots[i] = new TextView(this);
mDots[i].setText(Html.fromHtml("&#8226"));
mDots[i].setTextSize(35);
mDots[i].setTextColor(getResources().getColor(R.color.colorWhiteNearToGray));
mDotsLayout.addView(mDots[i]);
}
if (mDots.length > 0) {
mDots[position].setTextColor(getResources().getColor(R.color.colorWite));
}
}
ViewPager.OnPageChangeListener viewListener = new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int i, float v, int i1) {
}
#Override
public void onPageSelected(int i) {
addDotsIndiccator(i);
}
#Override
public void onPageScrollStateChanged(int i) {
}
};}
And this is my SideAdapter class
package time.one.just.show.introslyder;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class SlyderAdapter extends PagerAdapter {
Context context;
LayoutInflater layoutInflater;
public SlyderAdapter(Context context) {
this.context = context;
}
public int[] slide_imagesArray = {
R.drawable.eat,
R.drawable.men,
R.drawable.sleep};
public String[] slide_headerArray = {
"EAT", "men", "code"};
public String[] slide_descriptionArray = {
"this is 1st", "this is 2nd", "this is 3rd"
};
#Override
public int getCount() {
return slide_headerArray.length;
}
#Override
public boolean isViewFromObject(#NonNull View view, #NonNull Object o) {
return view == o;
}
#NonNull
#Override
public Object instantiateItem(#NonNull ViewGroup container, int position) {
layoutInflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
View view = layoutInflater.inflate(R.layout.slide_layoout, container, false);
ImageView slideImageView = (ImageView) view.findViewById(R.id.slideImage);
TextView slideheader = (TextView) view.findViewById(R.id.slideheader);
TextView slidedescription = (TextView) view.findViewById(R.id.slideDescription);
slideImageView.setImageResource(slide_imagesArray[position]);
slideheader.setText(slide_headerArray[position]);
slidedescription.setText(slide_descriptionArray[position]);
container.addView(view);
return view;
}
#Override
public void destroyItem(#NonNull ViewGroup container, int position, #NonNull Object object) {
container.removeView((RelativeLayout) object);
}
}
and this is my SliderLayout
<?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"
android:orientation="vertical"
android:layout_width="match_parent" android:layout_height="match_parent">
<ImageView
android:id="#+id/slideImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="89dp"
app:srcCompat="#drawable/eat" />
<TextView
android:id="#+id/slideheader"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="122dp"
android:layout_marginBottom="287dp"
android:text="بدون نیاز به اینترنت"
android:textSize="20sp"
android:textStyle="bold" />
<TextView
android:id="#+id/slideDescription"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="0dp"
android:layout_marginBottom="171dp"
android:text="آرشیو کامل این خواننده محبوب همیشه در جیب شم ، ، هر کدام ز آهنگ ها را خواستید می توانید دانلود کنید و هر زمان دلتون خوست به آن ها گوش بدهید حتی بدون نیز به اینترنت" />
</RelativeLayout>
and activtymain xml
<?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:background="#drawable/main_background"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
<LinearLayout
android:id="#+id/dots"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:orientation="horizontal"></LinearLayout>
</RelativeLayout>

I found a solution
just by add this inside my App
mDotsLayout.removeAllViews();
thank you all

How do I retrieve the ID number of this text view

How do I retrieve the text of a specific textView? BEcause when I click an ID number it displays '1' in the textview of the next class in every text view I click. I used JSON array so it's kind of tricky for me. And yes I'm completely a beginner.
DisplayListView
package rjj.tutorial_jsonandlistview;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.SearchView;
import android.widget.TextView;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class DisplayListView extends AppCompatActivity {
String json_string;
JSONObject jsonObject;
JSONArray jsonArray;
ContactAdapter contactAdapter;
ListView listView;
SearchView sv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.display_listview_layout);
listView = (ListView)findViewById(R.id.listview);
contactAdapter = new ContactAdapter(this,R.layout.row_layout);
listView.setAdapter(contactAdapter);
json_string = getIntent().getExtras().getString("json_data");
//Searchview
sv = (SearchView)findViewById(R.id.search);
sv.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
#Override
public boolean onQueryTextChange(String newText) {
contactAdapter.getFilter().filter(newText);
return true;
}
});
//End of Searchview
try {
jsonObject = new JSONObject(json_string);
jsonArray = jsonObject.getJSONArray("server_response");
int count = 0;
String id ,firstname , surname, age , username, password;
while(count<jsonArray.length()){
JSONObject JO = jsonArray.getJSONObject(count);
id = JO.getString("id");
firstname = JO.getString("firstname");
surname = JO.getString("surname");
age = JO.getString("age");
username = JO.getString("username");
password = JO.getString("password");
Contacts contact = new Contacts(id, firstname, surname, age,username,password);
contactAdapter.add(contact);
count++;
}
} catch (JSONException e) {
e.printStackTrace();
}
}
public void hello(View view) {
Intent intent = new Intent(this, Update.class);
TextView textView = (TextView)findViewById(R.id.tx_id);
String id = textView.getText().toString();
intent.putExtra("id", id);
startActivity(intent);
}
}
My ContactAdapter Class:
package rjj.tutorial_jsonandlistview;
import android.content.Context;
import android.support.annotation.LayoutRes;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Julian on 7/20/2017.
*/
public class ContactAdapter extends ArrayAdapter {
List list = new ArrayList();
public ContactAdapter(#NonNull Context context, #LayoutRes int resource) {
super(context, resource);
}
public void add(Contacts object) {
super.add(object);
list.add(object);
}
#Override
public int getCount() {
return list.size();
}
#Nullable
#Override
public Object getItem(int position) {
return list.get(position);
}
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
View row;
row = convertView;
ContactHolder contactHolder;
if(row == null){
LayoutInflater layoutInflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = layoutInflater.inflate(R.layout.row_layout,parent,false);
contactHolder = new ContactHolder();
contactHolder.tx_id = (TextView)row.findViewById(R.id.tx_id);
contactHolder.tx_firstname = (TextView)row.findViewById(R.id.tx_firstname);
contactHolder.tx_surname = (TextView)row.findViewById(R.id.tx_surname);
contactHolder.tx_age = (TextView)row.findViewById(R.id.tx_age);
contactHolder.tx_username = (TextView)row.findViewById(R.id.tx_username);
contactHolder.tx_password = (TextView)row.findViewById(R.id.tx_password);
row.setTag(contactHolder);
} else{
contactHolder = (ContactHolder)row.getTag();
}
Contacts contacts = (Contacts)this.getItem(position);
contactHolder.tx_id.setText(contacts.getId());
contactHolder.tx_firstname.setText(contacts.getFirstname());
contactHolder.tx_surname.setText(contacts.getSurname());
contactHolder.tx_age.setText(contacts.getAge());
contactHolder.tx_username.setText(contacts.getUsername());
contactHolder.tx_password.setText(contacts.getPassword());
return row;
}
static class ContactHolder{
TextView tx_id, tx_firstname, tx_surname, tx_age, tx_username, tx_password;
}
}
My Update Class:
package rjj.tutorial_jsonandlistview;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class Update extends AppCompatActivity {
String id;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_update);
id = getIntent().getExtras().getString("id");
TextView textView = (TextView)findViewById(R.id.textView);
textView.setText(id);
}
}
My display_listview_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<android.widget.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="rjj.tutorial_jsonandlistview.DisplayListView">
<SearchView
android:layout_width="match_parent"
android:layout_height="30dp"
android:id="#+id/search"
android:queryHint="Search..."/>
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/search"
android:id="#+id/listview">
</ListView>
</android.widget.RelativeLayout>
The row_layout.xml (which I use to display the JSON array)
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="75dp">
<TextView
android:layout_width="60dp"
android:layout_height="match_parent"
android:id="#+id/tx_id"
android:layout_alignParentLeft="true"
android:text="ID"
android:gravity="center"
android:textAppearance="?android:textAppearanceLarge"
android:onClick="hello"
/>
<TextView
android:layout_width="60dp"
android:layout_height="match_parent"
android:id="#+id/tx_firstname"
android:layout_toRightOf="#+id/tx_id"
android:text="Firstname"
android:gravity="center"
android:textAppearance="?android:textAppearanceLarge"
/>
<TextView
android:layout_width="60dp"
android:layout_height="match_parent"
android:id="#+id/tx_surname"
android:layout_toRightOf="#+id/tx_firstname"
android:text="Lastname"
android:gravity="center"
android:textAppearance="?android:textAppearanceLarge"
/>
<TextView
android:layout_width="60dp"
android:layout_height="match_parent"
android:id="#+id/tx_age"
android:layout_toRightOf="#+id/tx_surname"
android:text="Age"
android:gravity="center"
android:textAppearance="?android:textAppearanceLarge"
/>
<TextView
android:layout_width="60dp"
android:layout_height="match_parent"
android:id="#+id/tx_username"
android:layout_toRightOf="#+id/tx_age"
android:text="Username"
android:gravity="center"
android:textAppearance="?android:textAppearanceLarge"
/>
<TextView
android:layout_width="60dp"
android:layout_height="match_parent"
android:id="#+id/tx_password"
android:layout_toRightOf="#+id/tx_username"
android:text="Password"
android:gravity="center"
android:textAppearance="?android:textAppearanceLarge"
/>
</RelativeLayout>

In method hello(View view) you don't need this string:
TextView textView = (TextView)findViewById(R.id.tx_id);
becouse the view in hello(View view) this is our TextView. Just cast it to TextView and get text from it:
String id = ((TextView)view).getText().toString();
Another and most universal approach: to change
TextView textView = (TextView)findViewById(R.id.tx_id);
to
TextView textView = (TextView)((ViewGroup)(view.getParent())).findViewById(R.id.tx_id);
In this way you can use any R.id for current list item.

RecyclerView does not load data, shows nothing

I'm a beginner with Android and struggling with the implementation of a RecyclerView. Was working through a tutorial and changing the values to what I need. But when I start, the view stays empty. As far as I was planning, it was supposed to show 20 times the same item for the moment.
ExerciseList.java (Start Activity):
package com.example.erik.orlandoapp;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
public class ExerciseList extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTitle(getString(R.string.title_activity_exercise_list));
setContentView(R.layout.activity_exercise_list);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
}
ExerciseBlock.java:
package com.example.erik.orlandoapp;
import java.util.ArrayList;
import java.util.List;
public class ExerciseBlock {
private String title;
private int difficulty;
private int exerciseId;
private static int lastId = 0;
public ExerciseBlock(String title, int difficulty, int exerciseId) {
this.title = title;
this.difficulty = difficulty;
this.exerciseId = exerciseId;
}
public String getTitle() {
return title;
}
public int getDifficulty() {
return difficulty;
}
public int getExerciseId() {
return exerciseId;
}
public static ArrayList<ExerciseBlock> createContactsList(int numContacts) {
ArrayList<ExerciseBlock> exerciseBlocks = new ArrayList<ExerciseBlock>();
for (int i = 1; i <= numContacts; i++) {
exerciseBlocks.add(new ExerciseBlock("Title",1,1));
}
return exerciseBlocks;
}
}
ExerciseBlockAdapter.java:
package com.example.erik.orlandoapp;
import android.content.Context;
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.List;
public class ExerciseBlockAdapter extends RecyclerView.Adapter<ExerciseBlockAdapter.ViewHolder> {
private List<ExerciseBlock> exList;
private Context mContext;
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
View contactView = inflater.inflate(R.layout.exercise_item, parent, false);
ViewHolder viewHolder = new ViewHolder(contactView);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolder viewHolder, int position) {
ExerciseBlock exBlock = exList.get(position);
TextView textView = viewHolder.getTxtDiff();
textView.setText(exBlock.getDifficulty());
textView = viewHolder.getTxtExercise();
textView.setText(exBlock.getExerciseId());
}
#Override
public int getItemCount() {
return exList.size();
}
public ExerciseBlockAdapter(Context context, List<ExerciseBlock> exList) {
this.exList = exList;
this.mContext = context;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
private TextView txtExercise;
private TextView txtDiff;
public TextView getTxtExercise() {
return this.txtExercise;
}
public TextView getTxtDiff() {
return this.txtDiff;
}
public ViewHolder(View itemView) {
super(itemView);
txtDiff = (TextView) itemView.findViewById(R.id.txtExDiff);
txtExercise = (TextView) itemView.findViewById(R.id.txtExName);
}
}
}
UserListActivity:
package com.example.erik.orlandoapp;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import java.util.ArrayList;
public class UserListActivity extends AppCompatActivity {
ArrayList<ExerciseBlock> exerciseBlocks;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
RecyclerView rvContacts = (RecyclerView) findViewById(R.id.exerciseList);
exerciseBlocks = ExerciseBlock.createContactsList(20);
ExerciseBlockAdapter adapter = new ExerciseBlockAdapter(this, exerciseBlocks);
rvContacts.setAdapter(adapter);
rvContacts.setLayoutManager(new LinearLayoutManager(this));
}
}
activity_exercise_list.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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"
android:fitsSystemWindows="true"
tools:context="com.example.erik.orlandoapp.ExerciseList">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/exerciseList"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_marginBottom="20dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
exercise_item.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:weightSum="1">
<TextView
android:id="#+id/txtExName"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Whatever" />
<TextView
android:id="#+id/txtExDiff"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/colorDifEasy"
android:paddingBottom="6dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="6dp"
android:text="Leicht"
android:textSize="10sp" />
</LinearLayout>
Thanks a lot!

I don't see UserListActivity calling setContentView()
Either put this code inside ExersiceList Activity
RecyclerView rvContacts = (RecyclerView) findViewById(R.id.exerciseList);
exerciseBlocks = ExerciseBlock.createContactsList(20);
ExerciseBlockAdapter adapter = new ExerciseBlockAdapter(this, exerciseBlocks);
rvContacts.setAdapter(adapter);
rvContacts.setLayoutManager(new LinearLayoutManager(this));
or call setContentView(R.layout.activity_exercise_layout) on Your UserListActivity

StaggeredGrid RecyclerView not showing anything

I'm trying to inflate a RecyclerView which has as StaggeredGrid Layout, but it is not showing anything. I've pretty much copied previous code I've used before for the RecyclerView so I'm kind of stumped.
In MuseumStoriesViewHolder.onCreateViewHolder() the return of holder has the following value ViewHolder{337ec22b position=-1 id=-1, oldPos=-1, pLpos:-1 unboundundefined adapter position no parent} I'm not sure if this is realated, but it was something that seemed off to me.
It also might help to know that the fragment I'm inflating this RecyclerView is a nested Fragment.
Any help would be greatly appreciated.
MuseumFragment
package com.example.android.radiobuttontestproject.fragments;
import android.app.Activity;
import android.os.Bundle;
import android.app.Fragment;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.android.radiobuttontestproject.R;
import com.example.android.radiobuttontestproject.adapters.MuseumStoriesAdapter;
import com.example.android.radiobuttontestproject.helpers.pojo.StoryObject;
import com.example.android.radiobuttontestproject.test.SampleDataFactory;
import java.util.List;
import butterknife.Bind;
import butterknife.ButterKnife;
public class MuseumFragment extends Fragment {
private List<StoryObject> storyObjectList;
private StaggeredGridLayoutManager storyGridLayoutManager;
private MuseumStoriesAdapter storyAdapter;
#Bind(R.id.stories_recycler_view) RecyclerView storiesRecyclerView;
public static MuseumFragment newInstance() {
MuseumFragment fragment = new MuseumFragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
public MuseumFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_museum, container, false);
ButterKnife.bind(this, view);
//Sets up the stories
SampleDataFactory sampleDataFactory = new SampleDataFactory();
storyObjectList = sampleDataFactory.getSampleStories(
getResources().getStringArray(R.array.test_titles_for_grid_museum1),
getResources().getStringArray(R.array.test_desc_for_grid_museum1));
storyGridLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
storiesRecyclerView.setLayoutManager(storyGridLayoutManager);
storyAdapter = new MuseumStoriesAdapter(getActivity().getApplicationContext(), storyObjectList);
storiesRecyclerView.setAdapter(storyAdapter);
return view;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
#Override
public void onDetach() {
super.onDetach();
}
}
MuseumStoriesAdapter
package com.example.android.radiobuttontestproject.adapters;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import com.example.android.radiobuttontestproject.R;
import com.example.android.radiobuttontestproject.helpers.pojo.StoryObject;
import java.util.List;
public class MuseumStoriesAdapter extends RecyclerView.Adapter<MuseumStoriesAdapter.MuseumStoriesViewHolder> {
private List<StoryObject> itemList;
private LayoutInflater inflater;
private Context context;
public MuseumStoriesAdapter(Context context, List<StoryObject> itemList) {
this.itemList = itemList;
this.context = context;
inflater = LayoutInflater.from(this.context);
}
#Override
public MuseumStoriesViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View view = inflater.inflate(R.layout.view_box_small, viewGroup, false);
MuseumStoriesViewHolder holder = new MuseumStoriesViewHolder(view);
return holder;
}
#Override
public void onBindViewHolder(MuseumStoriesViewHolder holder, int position) {
holder.title.setText(itemList.get(position).getTitle());
holder.desc.setText(itemList.get(position).getDescription());
}
#Override
public int getItemCount() {
return itemList.size();
}
class MuseumStoriesViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView type,title,desc;
public MuseumStoriesViewHolder(View itemView) {
super(itemView);
//Tried Butterknife, but it doesn't seem like it was working in the view holder. - Peter
type = (TextView) itemView.findViewById(R.id.small_box_type);
title = (TextView) itemView.findViewById(R.id.small_box_title);
desc = (TextView) itemView.findViewById(R.id.small_box_desc);
itemView.setOnClickListener(this);
}
#Override
public void onClick(View view) {
Toast.makeText(view.getContext(), "Clicked Position = " + getPosition(), Toast.LENGTH_SHORT).show();
}
}
}
fragment_museum.xml
<ScrollView
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.example.android.radiobuttontestproject.fragments.MuseumFragment">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="1">
<TextView
android:id="#+id/museum_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="#dimen/header_margin"
android:gravity="center"
android:textSize="#dimen/font_larger"
android:text="#string/museum_header" />
<android.support.v7.widget.RecyclerView
android:id="#+id/stories_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</ScrollView>
view_box_small.xml
<?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="wrap_content"
android:layout_margin="#dimen/small_box_margin"
android:background="#color/small_box_background_color">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<!--TODO Make layout_height wrap contenet -->
<ImageView
android:layout_width="match_parent"
android:layout_height="120dp"
android:background="#color/test_color2"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:src="#drawable/abc_btn_rating_star_off_mtrl_alpha"
/>
</FrameLayout>
<TextView
android:id="#+id/small_box_type"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="#dimen/font_small"
android:textColor="#color/font_red"
android:text="Object"
/>
<TextView
android:id="#+id/small_box_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="#dimen/font_large"
android:textColor="#color/font_black"
android:text="Sample Text Here"
/>
<TextView
android:id="#+id/small_box_desc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="#dimen/font_normal"
android:textColor="#color/font_black"
android:textStyle="italic"
android:text="Sample Text Here"
/>
</LinearLayout>

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