title: How do i fix java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 in android? I am trying to learn ArrayList
body: <p>What the hell is this thing</p>
  
  <pre><code>public class MainActivity extends AppCompatActivity {
  ArrayList&lt;String&gt; celebrityURL = new ArrayList&lt;&gt;();
  int chosenCeleb = 0;
  ImageView celebrityImage;
  int locationAnswer = 0;
  //random answers
  </code></pre>
  
  <hr>
  
  <pre><code>ArrayList&lt;String&gt; answers = new ArrayList&lt;&gt;();
  //random buttons reference
  Button button01;
  Button button02;
  Button button03;
  Button button04;
  
  
  ArrayList&lt;String&gt; names = new ArrayList&lt;&gt;();
  
  public void selectCeleb(View view) {
  
      if (view.getTag().toString().equals(Integer.toString(locationAnswer))) {
          Toast.makeText(getApplicationContext(), "CORRECT ", Toast.LENGTH_LONG).show();
  
  
  
      } else {
          Toast.makeText(getApplicationContext(), "WRONG, IT WAS: " + names.get(chosenCeleb), Toast.LENGTH_SHORT).show();
  
  
  
      }
  
      randomCelebrity();
  }
  
  public class imagesGet extends AsyncTask&lt;String, Void, Bitmap&gt; {
  
      @Override
      protected Bitmap doInBackground(String... params) {
  
          try {
              URL imagesURL = new URL(params[0]);
              HttpURLConnection connection = (HttpURLConnection)   imagesURL.openConnection();
              connection.connect();
              InputStream inputStream = connection.getInputStream();
              Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
              return bitmap;
  
          } catch (MalformedURLException e) {
              e.printStackTrace();
          } catch (IOException e) {
              e.printStackTrace();
          }
  
          return null;
      }
  }
  
  
  public class getData extends AsyncTask&lt;String, Void, String&gt; {
  
      @Override
      protected String doInBackground(String... urls) {
  
          String result = "";
          URL url;
          HttpURLConnection connection = null;
          try {
              url = new URL(urls[0]);
              connection = (HttpURLConnection) url.openConnection();
              InputStream inputStream = connection.getInputStream();
              InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
              int data = inputStreamReader.read();
              while (data != -1) {
                  char current = (char) data;
                  result += current;
                  data = inputStreamReader.read();
              }
              return result;
          } catch (MalformedURLException e) {
              e.printStackTrace();
          } catch (IOException e) {
              e.printStackTrace();
          }
  
  
          return null;
      }
  }
  
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      celebrityImage = (ImageView) findViewById(R.id.celebrityID);
      button01 = (Button) findViewById(R.id.celebrity01);
      button02 = (Button) findViewById(R.id.celebrity02);
      button03 = (Button) findViewById(R.id.celebrity03);
      button04 = (Button) findViewById(R.id.celebrity04);
  
      getData task = new getData();
      String resultData = null;
      try {
          try {
              resultData = task.execute("http://www.posh24.se/kandisar").get();
          } catch (InterruptedException e) {
              e.printStackTrace();
          }
  
          String[] spResult = resultData.split("&lt;div class\"sidebarContainer\"&gt;");
  
          //images
          Pattern pattern = Pattern.compile("img src=\"(.*?)\"");
          Matcher matcher = pattern.matcher(spResult[0]);
          while (matcher.find()) {
              celebrityURL.add(matcher.group(1));
          }
  
          //names of the celebrities
          pattern = Pattern.compile("alt=\"(.*?)\"");
          matcher = pattern.matcher(spResult[0]);
          while (matcher.find()) {
              names.add(matcher.group(1));
          }
  
  
      }  catch (ExecutionException e) {
          e.printStackTrace();
      }
      randomCelebrity();
  }
  
  public void randomCelebrity() {
      //random  celebrity
      Random random = new Random();
      chosenCeleb = random.nextInt
              //between zero and the size of celebURL
                      (celebrityURL.size());
  
      //update imageView with new celebrity image
      imagesGet imagesGet = new imagesGet();
      Bitmap celebBitmap;
      try {
          celebBitmap = imagesGet.execute(celebrityURL.get(chosenCeleb)).get();
          celebrityImage.setImageBitmap(celebBitmap);
          int incorrectLocation;
          locationAnswer = random.nextInt(4);
  </code></pre>
  
  <hr>
  
  <pre><code>        for (int i = 0; i &lt; answers.size(); i++) {
              if (i == locationAnswer) {
                  //update answers
                  answers.get(chosenCeleb);
  
              } else {
                  //create random celebrity from celebs urls
                  incorrectLocation = random.nextInt(celebrityURL.size());
  
                  //avoid getting the correct and wrong answer in same location
                  //generate random answer if this condition is met
                  while (incorrectLocation == chosenCeleb) {
                      incorrectLocation = random.nextInt(celebrityURL.size());
                  }
  
                  //assign wrong location answer in answers array
                  answers.get(names.indexOf(incorrectLocation));
              }
          }
  </code></pre>
  
  <hr>
  
  <pre><code>        button01.setText(answers.get(0));
          button02.setText(answers.get(1));
          button03.setText(answers.get(2));
          button04.setText(answers.get(3));
      } catch (ExecutionException e) {
          e.printStackTrace();
      } catch (InterruptedException e) {
          e.printStackTrace();
      }
  
    }
    }
  </code></pre>
  
  <p>I divide the code so you can see it better. I am not idea how to fix this, but i know it is something with the ArrayList answers thing.
  I am trying to make an app that will random take html data and display it in android app. I am making an app to ques the celebrity name.</p>
  
  <p>Edit: Sorry i forgot to include the error</p>
  
  <pre><code>FATAL EXCEPTION: main
  Process: com.stringmanipulation.stringmanipulation, PID: 24397
                                                   java.lang.IllegalStateException: Could not execute method for android:onClick
                                                     at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
                                                     at android.view.View.performClick(View.java:5610)
                                                     at android.view.View$PerformClick.run(View.java:22265)
                                                     at android.os.Handler.handleCallback(Handler.java:751)
                                                     at android.os.Handler.dispatchMessage(Handler.java:95)
                                                     at android.os.Looper.loop(Looper.java:154)
                                                     at android.app.ActivityThread.main(ActivityThread.java:6077)
                                                     at java.lang.reflect.Method.invoke(Native Method)
                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
                                                  Caused by: java.lang.reflect.InvocationTargetException
                                                     at java.lang.reflect.Method.invoke(Native Method)
                                                     at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
                                                     at android.view.View.performClick(View.java:5610) 
                                                     at android.view.View$PerformClick.run(View.java:22265) 
                                                     at android.os.Handler.handleCallback(Handler.java:751) 
                                                     at android.os.Handler.dispatchMessage(Handler.java:95) 
                                                     at android.os.Looper.loop(Looper.java:154) 
                                                     at android.app.ActivityThread.main(ActivityThread.java:6077) 
                                                     at java.lang.reflect.Method.invoke(Native Method) 
                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) 
                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 
                                                  Caused by: java.lang.IndexOutOfBoundsException: Index: 103, Size: 100
                                                     at java.util.ArrayList.get(ArrayList.java:411)
                                                     at com.stringmanipulation.stringmanipulation.MainActivity.randomCelebrity(MainActivity.java:183)
                                                     at com.stringmanipulation.stringmanipulation.MainActivity.selectCeleb(MainActivity.java:53)
                                                     at java.lang.reflect.Method.invoke(Native Method) 
                                                     at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) 
                                                     at android.view.View.performClick(View.java:5610) 
                                                     at android.view.View$PerformClick.run(View.java:22265) 
                                                     at android.os.Handler.handleCallback(Handler.java:751) 
                                                     at android.os.Handler.dispatchMessage(Handler.java:95) 
                                                     at android.os.Looper.loop(Looper.java:154) 
  </code></pre>