Develop Reference

Why My Recyclerview Isn't Working In An Acticvity

I need to parse json and show them on RecyclerView.. But my RecyclerView isn't working..
I need to fix this..
This is Json
Simple Json File for My app
[
{
"name": "Saif Maroof",
"roll": 978617,
"gender":"Male",
"phonenumber": 01931078639,
"StudentImage": "R.drawble.books"
},
{
"name": "Minhaj",
"roll": 978617,
"gender":"Male",
"phonenumber": 01931078639,
"studentimage": "R.drawble.books"
}
]
This is StudentInfo Activity
I think in this activity nothing gets wrong
package com.college.npc17_18.activity;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.DividerItemDecoration;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import android.util.Log;
import android.view.MenuItem;
import com.college.npc17_18.MainActivity;
import com.college.npc17_18.R;
import com.college.npc17_18.adapter.StudentInfoAdapter;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
public class StudentInfo extends AppCompatActivity {
RecyclerView recyclerView;
StudentInfoAdapter studentInfoAdapter;
RecyclerView.Adapter adapter;
// ProgressBar progressBar;
RecyclerView.LayoutManager layoutManager;
List <Object> studentInfo = new ArrayList<>();
DividerItemDecoration dividerItemDecoration;
private static final String TAG = "MainActivity";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_student_info);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
// progressBar = findViewById(R.id.progress_circular_country);
recyclerView = findViewById(R.id.studentsInfoRecycleView);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
adapter = new StudentInfoAdapter(this,studentInfo);
// String jsonFileString = Utils.getJsonFromAssets(getApplicationContext(), "studentinfo.json");
// progressBar.setVisibility(View.GONE);
// studentInfoAdapter = new StudentInfoAdapter(this,studentInfo);
recyclerView.setAdapter(adapter);
addItemsFromJSON();
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
finish();
}
return super.onOptionsItemSelected(item);
}
private void addItemsFromJSON() {
try {
String jsonDataString = readJSONDataFromFile();
JSONArray jsonArray = new JSONArray(jsonDataString);
for (int i=0; i<jsonArray.length(); ++i) {
JSONObject itemObj = jsonArray.getJSONObject(i);
String name = itemObj.getString("name");
String roll = itemObj.getString ("roll");
String phonenumber = itemObj.getString("phonenumber");
String gender = itemObj.getString("gender");
int studentimage = itemObj.getInt("studentimage");
com.college.npc17_18.model.StudentInfo studentInfos = new com.college.npc17_18.model.StudentInfo(name,roll,phonenumber,gender,studentimage);
studentInfo.add(studentInfos);
}
} catch (JSONException | IOException e) {
Log.d(TAG, "addItemsFromJSON: ", e);
}
}
private String readJSONDataFromFile() throws IOException{
InputStream inputStream = null;
StringBuilder builder = new StringBuilder();
try {
String jsonString = null;
inputStream = getResources().openRawResource(R.raw.studentinfo);
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(inputStream, "UTF-8"));
while ((jsonString = bufferedReader.readLine()) != null) {
builder.append(jsonString);
}
} finally {
if (inputStream != null) {
inputStream.close();
}
}
return new String(builder);
}
}
This is StudentInfo Adapter
package com.college.npc17_18.adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.college.npc17_18.R;
import com.college.npc17_18.model.StudentInfo;
import java.util.ArrayList;
import java.util.List;
public class StudentInfoAdapter extends RecyclerView.Adapter <StudentInfoAdapter.Viewholder> {
private List <Object> studentInfos;
Context context;
public StudentInfoAdapter(Context context, List<Object> studentInfo) {
this.studentInfos = studentInfo;
this.context = context;
}
#NonNull
#Override
public StudentInfoAdapter.Viewholder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.studentitem,parent,false);
return new Viewholder(view);
}
#Override
public void onBindViewHolder(#NonNull StudentInfoAdapter.Viewholder holder, int position) {
StudentInfo studentInfo = (StudentInfo) studentInfos.get(position);
holder.StudentImageId.setImageResource (studentInfo.getStudentImage());
holder.NameId.setText("Name:"+studentInfo.getNamme());
holder.RollId.setText("Roll"+studentInfo.getRoll());
holder.GenderId.setText("Gender:"+studentInfo.getGender());
holder.PhoneNumberId.setText("Phone Number:"+studentInfo.getPhoneNumber());
}
#Override
public int getItemCount() {
return studentInfos.size();
}
public class Viewholder extends RecyclerView.ViewHolder{
TextView NameId,RollId,PhoneNumberId,GenderId;
ImageView StudentImageId;
public Viewholder(#NonNull View itemView) {
super(itemView);
StudentImageId = itemView.findViewById(R.id.StudentImageId);
NameId = itemView.findViewById(R.id.NameId);
RollId = itemView.findViewById(R.id.RollId);
// CGPAId = itemView.findViewById(R.id.CGPAId);
GenderId = itemView.findViewById(R.id.GenderId);
PhoneNumberId = itemView.findViewById(R.id.PhoneNumberId);
}
}
}
This is StudentItem.xml
Layout for RecyclerView...
<?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"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:clickable="true"
android:elevation="40dp"
app:cardCornerRadius="5dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="horizontal">
<ImageView
android:id="#+id/StudentImageId"
android:layout_width="71dp"
android:layout_height="match_parent" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:orientation="vertical">
<TextView
android:id="#+id/NameId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Name"
android:textSize="18sp" />
<TextView
android:id="#+id/RollId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Roll" />
<TextView
android:id="#+id/GenderId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Gender" />
<TextView
android:id="#+id/PhoneNumberId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Phone Number" />
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>
Now what do I need to do?

At the time when you instantiate an object of your adapter class
adapter = new StudentInfoAdapter(this,studentInfo);
Your adapter object is initialized with an empty studentInfo list
So, you should call adapter.notifyDataSetChanged(); in your addItemsFromJSON() method when the JSON parsing is completed.

update your adapter after you set your data
yourAdapter.notifyDataSerChanged();

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.

custom listview with images

Hello guys im new to android dev and im having an unknown error with my code,i finished the code but when i run it sends me back to "dataprovider". can anyone please help me?
My fragment.
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
public class Places_Fragment extends ListFragment {
ListView listView;
int[] images ={R.drawable.cake_1,R.drawable.cake_2,R.drawable.cake_3,R.drawable.cake_4,R.drawable.cake_5,R.drawable.cake_6};
String[] places;
PlaceAdapter adapter;
public static Places_Fragment newInstance() {
Places_Fragment fragment = new Places_Fragment();
return fragment;
}
public Places_Fragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_places_, container, false);
listView =(ListView)rootView .findViewById(R.id.listView);
places = getResources().getStringArray(R.array.places);
int i=0;
adapter = new PlaceAdapter(getActivity(),R.layout.row_layout);
listView.setAdapter(adapter);
for(String item: places)
{
PlaceDataProvider dataProvider = new PlaceDataProvider(images[i],places[i]);
adapter.add(dataProvider);
i++;
}
return rootView;
}
}
My custom Adapter.
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 java.util.ArrayList;
import java.util.List;
/**
* Created by Bonfire-ADv on 4/23/2016.
*/
public class PlaceAdapter extends ArrayAdapter {
List list =new ArrayList();
public PlaceAdapter(Context context, int resource) {
super(context, resource);
}
static class DataHandler
{
ImageView images;
TextView Places;
}
#Override
public void add(Object object) {
super.add(object);
list.add(object);
}
#Override
public int getCount() {
return this.list.size();
}
#Override
public Object getItem(int position) {
return this.list.get(position);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View row;
row = convertView;
DataHandler handler;
if (convertView== null)
{
LayoutInflater inflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate (R.layout.row_layout, parent, false);
handler = new DataHandler();
handler.images = (ImageView) row.findViewById(R.id.image_view);
handler.Places = (TextView) row.findViewById(R.id.place_title);
row.setTag(handler);
}
else
{
handler = (DataHandler) row.getTag();
}
PlaceDataProvider dataProvider;
dataProvider = (PlaceDataProvider) this.getItem(position);
handler.images.setImageResource(dataProvider.getImages());
handler.Places.setText(dataProvider.getPlaces());
return row;
}
}
My dataprovider.
package com.selfstudios.cakeplanet;
public class PlaceDataProvider {
private int images;
private String places;
public PlaceDataProvider(int images,String places)
{
this.setImages(images);
this.setPlaces(places);
}
public int getImages() {
return images;
}
public void setImages(int images) {
this.images = images;
}
public String getPlaces() {
return places;
}
public void setPlaces(String places) {
this.places = places;
}
}
my frag xml.
<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.selfstudios.cakeplanet.Places_Fragment">
<!-- TODO: Update blank fragment layout -->
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/listView"
android:layout_weight="1" />
</LinearLayout>
my row xml.
<?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="80dp">
<ImageView
android:layout_width="100dp"
android:layout_height="75dp"
android:id="#+id/image_view"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:paddingStart="2dp"
android:paddingLeft="2dp"
android:paddingEnd="2dp"
android:src="#drawable/cake_1"
/>
<TextView
android:id="#+id/place_title"
android:layout_width="175dp"
android:layout_height="75dp"
android:text="place name"
android:gravity="center"
android:layout_alignParentTop="false"
android:layout_centerHorizontal="true"
/>
<View
android:layout_width="match_parent"
android:layout_height="2dp"
android:background="#color/colorPrimaryDark"
android:layout_alignBottom="#+id/image_view">
</View>
</RelativeLayout>

Try replacing
for(String item: places)
with the more traditional
for(int i; i < places.size(); i++

Android: How to create a filtering function with Checkbox

I am trying to create a filtering function with checkbox for my application. I have populated a list of installed application and i want to filter out only a few it. My idea is to get those checkbox that are checked and store it into an array. After which, display it back into a listview.
Example:
For this example, i would like to only list out Maps and Camera upon clicking on the submit button.
Does anyone know what should i do to achieve this? I'm clueless at the moment due to my knowledge of android studio.
Here is my code.
activity_main.xml
<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"
android:orientation="vertical">
<ListView
android:id="#+id/android:list"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</ListView>
</LinearLayout>
activity_list_app.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="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="#+id/app_icon"
android:layout_width="50dp"
android:layout_height="50dp"
android:padding="3dp"
android:scaleType="centerCrop"
android:contentDescription="#null"/>
<LinearLayout
android:layout_width="240dp"
android:layout_height="wrap_content"
android:gravity="center|center_vertical"
android:orientation="vertical"
android:padding="5dp">
<TextView
android:id="#+id/app_name"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:textStyle="bold"
android:layout_gravity="left" />
<TextView
android:id="#+id/app_package"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_gravity="left" />
</LinearLayout>
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/checkbox" />
MainActivity.java
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.CheckedTextView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends ListActivity{
private PackageManager packageManager = null;
private List<ApplicationInfo> applist = null;
private AppAdapter listadapter = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
packageManager = getPackageManager();
//ListView listview= getListView();
new LoadApplications().execute();
}
protected void onListItemClick(ListView l, View v, int position, long id){
super.onListItemClick(l, v, position, id);
ApplicationInfo app = applist.get(position);
try{
Intent intent = packageManager.getLaunchIntentForPackage(app.packageName);
if(intent != null){
startActivity(intent);
}
}catch(ActivityNotFoundException e){
Toast.makeText(MainActivity.this,e.getMessage(), Toast.LENGTH_LONG).show();
}catch(Exception e){
Toast.makeText(MainActivity.this,e.getMessage(), Toast.LENGTH_LONG).show();
}
}
private List<ApplicationInfo> checkForLaunchIntent(List<ApplicationInfo> list){
ArrayList<ApplicationInfo> appList = new ArrayList<ApplicationInfo>();
for(ApplicationInfo info : list){
try{
if(packageManager.getLaunchIntentForPackage(info.packageName)!=null){
appList.add(info);
}
}catch(Exception e){
e.printStackTrace();
}
}
return appList;
}
private class LoadApplications extends AsyncTask<Void, Void, Void>{
private ProgressDialog progress = null;
protected Void doInBackground(Void... params){
applist = checkForLaunchIntent(packageManager.getInstalledApplications(PackageManager.GET_META_DATA));
listadapter = new AppAdapter(MainActivity.this, R.layout.activity_list_app, applist);
return null;
}
protected void onPostExecute(Void result){
setListAdapter(listadapter);
progress.dismiss();
super.onPostExecute(result);
}
protected void onPreExecute(){
progress = ProgressDialog.show(MainActivity.this, null, "Loading apps info...");
super.onPreExecute();
}
}
}
AppAdapter.java
import java.util.List;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.util.SparseBooleanArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class AppAdapter extends ArrayAdapter<ApplicationInfo>{
private List<ApplicationInfo> appList;
private Context context;
private PackageManager packageManager;
public AppAdapter(Context context, int resource, List<ApplicationInfo> objects){
super(context, resource,objects);
this.context = context;
this.appList= objects;
packageManager= context.getPackageManager();
}
public View getView(int position, View convertView, ViewGroup parent){
View view = convertView;
if(null == view){
LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = layoutInflater.inflate(R.layout.activity_list_app,null);
}
ApplicationInfo data = appList.get(position);
if(null != data){
TextView appName = (TextView) view.findViewById(R.id.app_name);
TextView packageName = (TextView) view.findViewById(R.id.app_package);
ImageView iconView = (ImageView) view.findViewById(R.id.app_icon);
appName.setText(data.loadLabel(packageManager));
packageName.setText(data.packageName);
iconView.setImageDrawable(data.loadIcon(packageManager));
}
return view;
}
public int getCount(){
return((null != appList) ? appList.size() : 0);
}
public ApplicationInfo getItem(int position){
return((null != appList) ? appList.get(position): null);
}
public long getItemId(int position) {
return position;
}
}

Android Custom ListView with ArrayList How do I open a second activity

I have this Custom ListView with ArrayList and I am trying to Open second Activity Using
the Icon Used is in the folder drawable
setOnItemClickListener(new OnItemClickListener() {}
but it force closes the app when I click on the ListItem
CbMain.java
package com.frostistudios.circuitbasicspro;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;
public class CbMain extends Activity {
String[] listItems = {"Menu One","Menu Two","Menu Three"};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cb_main);
ListView lv = (ListView) findViewById(R.id.listView); //listview in xml file
List<ListViewItem> items = new ArrayList<CbMain.ListViewItem>();
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position,
long id) {
if(position == 0){
//call to custom method for opening activity
openItemOneActivity();
}
else if(position == 1){
openItemTwoActivity();
}
else if(position == 2){
openItemThreeActivity();
}
}
});
items.add(new ListViewItem()
{{
ThumbnailResource = R.drawable.ic_action_call;
Title = listItems[0];
SubTitle = "";
}});
items.add(new ListViewItem()
{{
ThumbnailResource = R.drawable.ic_action_call;
Title = listItems[1];
SubTitle = "";
}});
items.add(new ListViewItem()
{{
ThumbnailResource = R.drawable.ic_action_call;
Title = listItems[2];
SubTitle = "";
}});
CustomListViewAdapter adapter = new CustomListViewAdapter(this, items);
lv.setAdapter(adapter);
}
//custom methods to open another activity
public void openItemOneActivity(){
Intent intent = new Intent(this,ItemOneActivity.class);
startActivity(intent);
}
public void openItemTwoActivity(){
Intent intent = new Intent(this,ItemTwoActivity.class);
startActivity(intent);
}
public void openItemThreeActivity(){
Intent intent = new Intent(this,ItemThreeActivity.class);
startActivity(intent);
}
class ListViewItem {
public int ThumbnailResource;
public String Title;
public String SubTitle;
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
//getMenuInflater().inflate(R.menu.actionbar, menu);
//return super.onCreateOptionsMenu(menu);
return true;
}
}
CustomListViewAdapter.java
this is the custom list adapter file
package com.frostistudios.circuitbasicspro;
import java.util.List;
import com.frostistudios.circuitbasicspro.CbMain.ListViewItem;
import android.app.Activity;
import android.content.Context;
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;
public class CustomListViewAdapter extends BaseAdapter
{
LayoutInflater inflater;
List<ListViewItem> items;
public CustomListViewAdapter(Activity context, List<ListViewItem> items) {
super();
this.items = items;
this.inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return items.size();
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ListViewItem item = items.get(position);
View vi=convertView;
if(convertView==null)
vi = inflater.inflate(R.layout.item_row, null);
ImageView imgThumbnail = (ImageView) vi.findViewById(R.id.imgThumbnail);
TextView txtTitle = (TextView) vi.findViewById(R.id.txtTitle);
TextView txtSubtitle = (TextView) vi.findViewById(R.id.txtSubTitle);
imgThumbnail.setImageResource(item.ThumbnailResource);
txtTitle.setText(item.Title);
txtSubtitle.setText(item.SubTitle);
return vi;
}
}
and this is the XML File that holds the ListView Design
<?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="match_parent"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imgThumbnail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:src="#drawable/ic_action_call"
android:layout_marginLeft="10dp"
android:layout_marginTop="2dp"/>
<TextView
android:id="#+id/txtTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/imageView1"
android:layout_toRightOf="#+id/imageView1"
android:text="Large Text"
android:layout_marginLeft="60dp"
android:layout_marginTop="6dp"/>
<TextView
android:id="#+id/txtSubTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/imageView1"
android:layout_alignLeft="#+id/textView1"
android:layout_below="#+id/textView1"
android:text="" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="#+id/textView1"
android:src="#drawable/arrow" />
</RelativeLayout>

Looking from your log cat, the error seems because the theme you used is not from the compat. Check your manifest, and make sure you use the compat theme.
Example (for ALL acitivities in your apps) :
<application
//other code
android:theme="#style/Theme.AppCompat.Light" >
Or if you only use the action bar on particular activity :
<Activity
//other code
android:theme="#style/Theme.AppCompat.Light" >
TIPS :
Always pay attention to the log cat, especially the caused by. I know the problem from there.

It would help a lot if you posted the error output. Are your other Activities declared in your manifest? You already have a context in the adapter, so you could set it there and try. I also think that View vi is unecessary, you can use convertView.