title: ListView: How to add data on custom ArrayAdapter?
body: <p>To have a colorful ListView I have created my own ArrayAdapter, but when I want to use <code>adapter.clear()</code> or <code>adapter.add()</code> it gives me errors. Here is the code and errors.</p>
  
  <p>XML file:</p>
  
  <pre><code>&lt;ListView
      android:id="@+id/android:list"
      android:layout_width="0dip"
      android:layout_height="wrap_content"
      android:padding="10dip"
      android:layout_margin="4dip"
      android:layout_weight="1"&gt;
  &lt;/ListView&gt;
  </code></pre>
  
  <p>Adapter:</p>
  
  <pre><code>class stableArrayAdapter extends ArrayAdapter&lt;String&gt; {
  
      HashMap&lt;String, Integer&gt; mIdMap = new HashMap&lt;String, Integer&gt;();
  
      public stableArrayAdapter(Context context, int textViewResourceId, String [] objects) 
      {
          super(context, textViewResourceId, objects);
          for (int i = 0; i &lt; objects.length; ++i) {
              mIdMap.put(objects[i], i);
          }
      }
  
      @Override
      public long getItemId(int position) {
          String item = getItem(position);
          return mIdMap.get(item);
      }
  
      @Override
      public boolean hasStableIds() {
          return true;
      }
  }
  </code></pre>
  
  <p>Java code:</p>
  
  <pre><code>public class createtarget extends ListActivity
  {
      stableArrayAdapter adapter;
  
      @Override
      public void onCreate(Bundle savedInstanceState) 
      {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.createtarget);
  
  
          lstView = getListView();
          lstView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);        
          lstView.setTextFilterEnabled(true);
  
          Target=new String []{""};
          adapter = new stableArrayAdapter(this,android.R.layout.simple_list_item_checked, Target);
          setListAdapter(adapter);
      }   
  }
  </code></pre>
  
  <p>Add code:</p>
  
  <pre><code>public void submit(View view) 
  {
  
      adapter.add("Hello");
      } 
  </code></pre>
  
  <p>Errors:</p>
  
  <pre><code>06-08 05:21:11.785: E/AndroidRuntime(3584): FATAL EXCEPTION: main
  06-08 05:21:11.785: E/AndroidRuntime(3584): java.lang.IllegalStateException: Could not execute method of the activity
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.view.View$1.onClick(View.java:3599)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.view.View.performClick(View.java:4204)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.view.View$PerformClick.run(View.java:17355)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.os.Handler.handleCallback(Handler.java:725)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.os.Handler.dispatchMessage(Handler.java:92)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.os.Looper.loop(Looper.java:137)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.app.ActivityThread.main(ActivityThread.java:5041)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at java.lang.reflect.Method.invokeNative(Native Method)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at java.lang.reflect.Method.invoke(Method.java:511)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at dalvik.system.NativeStart.main(Native Method)
  06-08 05:21:11.785: E/AndroidRuntime(3584): Caused by: java.lang.reflect.InvocationTargetException
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at java.lang.reflect.Method.invokeNative(Native Method)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at java.lang.reflect.Method.invoke(Method.java:511)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.view.View$1.onClick(View.java:3594)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     ... 11 more
  06-08 05:21:11.785: E/AndroidRuntime(3584): Caused by: java.lang.UnsupportedOperationException
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at java.util.AbstractList.add(AbstractList.java:404)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at java.util.AbstractList.add(AbstractList.java:425)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at android.widget.ArrayAdapter.add(ArrayAdapter.java:179)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     at net.learn2develop.UsingIntent.createtarget.submit(createtarget.java:136)
  06-08 05:21:11.785: E/AndroidRuntime(3584):     ... 14 more
  06-08 05:21:16.206: E/Trace(3614): error opening trace file: No such file or directory (2)
  </code></pre>