Having Problem in Android Application - Unfortunately stopped Working
FATAL EXCEPTION: main Process: com.example.faizanamin.myapplication, PID: 12590 java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.List.size()' on a null object reference
package com.example.faizanamin.myapplication;
import android.content.Context;
import android.os.AsyncTask;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.MenuItemHoverListener;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.accessibility.CaptioningManager;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.RatingBar;
import android.widget.TextView;
import com.example.faizanamin.myapplication.models.MovieModel;
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.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private TextView tvData;
private ListView lvMovies;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lvMovies = (ListView)findViewById(R.id.lvMovies);
//new JSONTask().execute("http://android.devfever.com/moviesdemo.txt");
}
public class JSONTask extends AsyncTask<String, String, List<MovieModel> >{
@Override
protected List<MovieModel> doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url=new URL(params[0]);
connection = (HttpURLConnection)url.openConnection();
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
String line="";
StringBuffer buffer = new StringBuffer();
while((line=reader.readLine())!=null){
buffer.append(line);
}
String finalJson = buffer.toString();
JSONObject parentObject = new JSONObject(finalJson);
JSONArray parentArray = parentObject.getJSONArray("movies");
List<MovieModel> movieModelList = new ArrayList<>();
for(int i=0;i<parentArray.length();i++) {
JSONObject finalObject = parentArray.getJSONObject(i);
MovieModel movieModel = new MovieModel();
movieModel.setMovie(finalObject.getString("movie"));
movieModel.setYear(finalObject.getInt("year"));
movieModel.setRating((float) finalObject.getDouble("rating"));
movieModel.setDirector(finalObject.getString("director"));
movieModel.setDuration(finalObject.getString("duration"));
movieModel.setTagline(finalObject.getString("tagline"));
movieModel.setImage(finalObject.getString("image"));
movieModel.setStory(finalObject.getString("story"));
List<MovieModel.Cast> castList = new ArrayList<>();
for(int j=0; j<finalObject.getJSONArray("cast").length(); j++){
MovieModel.Cast cast = new MovieModel.Cast();
cast.setName(finalObject.getJSONArray("cast").getJSONObject(j).getString("name"));
castList.add(cast);
}
movieModel.setCastList(castList);
movieModelList.add(movieModel);
}
return movieModelList;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
} finally {
if (connection!=null) {
connection.disconnect();
}
try {
if(reader!=null){
reader.close();}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPostExecute(List<MovieModel> result) {
super.onPostExecute(result);
// TODO NEED TO SET DATA
MovieAdapter adapter = new MovieAdapter(getApplicationContext(),R.layout.row,result);
lvMovies.setAdapter(adapter);
}
}
public class MovieAdapter extends ArrayAdapter{
private List<MovieModel> movieModelList;
private int resource;
private LayoutInflater inflater;
public MovieAdapter(Context context, int resource, List<MovieModel> objects) {
super(context, resource, objects);
movieModelList = objects;
this.resource = resource;
inflater = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if(convertView == null){
convertView = inflater.inflate(resource,null);
}
ImageView lvMovieIcon;
TextView tvMovie,tvTagline,tvYear,tvDuration,tvDirector,tvCast,tvStory;
RatingBar rMovieRating;
lvMovieIcon = (ImageView)findViewById(R.id.imageView);
tvMovie = (TextView)findViewById(R.id.movieName);
tvTagline = (TextView)findViewById(R.id.tagline);
tvYear = (TextView)findViewById(R.id.year);
tvDuration = (TextView)findViewById(R.id.duration);
tvDirector = (TextView)findViewById(R.id.director);
rMovieRating = (RatingBar) findViewById(R.id.rating);
tvCast = (TextView)findViewById(R.id.cast);
tvStory = (TextView)findViewById(R.id.story);
tvMovie.setText(movieModelList.get(position).getMovie());
tvTagline.setText(movieModelList.get(position).getTagline());
tvYear.setText("Year: "+movieModelList.get(position).getYear());
tvDuration.setText(movieModelList.get(position).getDuration());
tvDirector.setText(movieModelList.get(position).getDirector());
//Rating Bar
rMovieRating.setRating(movieModelList.get(position).getRating()/2);
StringBuffer stringBuffer = new StringBuffer();
for(MovieModel.Cast cast:movieModelList.get(position).getCastList()){
stringBuffer.append(cast.getName()+", ");
}
tvCast.setText(stringBuffer);
tvStory.setText(movieModelList.get(position).getStory());
return convertView;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu){
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item){
int id = item.getItemId();
if(id == R.id.action_refreash){
new JSONTask().execute("http://android.devfever.com/allmovielist.txt");
return true;
}
return super.onOptionsItemSelected(item);
}
}
