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My Main Activity extends ListActivity and displays a List. I am using custom Listitems defined in a class named DefinitionAdapter. I also have a seperate class that implements OnClickListener. In the class DefinitionAdapter I set the OnClickListener to the ListItems: public View getView(int position, View convertView, ViewGroup parent) { View v = convertView; if (v == null) { LayoutInflater vi = (LayoutInflater)getContext().getSystemService( Context.LAYOUT_INFLATER_SERVICE); v = vi.inflate(R.layout.row, null); } ... v.setOnClickListener(new OnItemClickListener(position) ); return v; } My custom OnClickListener is supposed to start another activity. public class OnItemClickListener implements OnClickListener extends Activity { private int position; public OnItemClickListener(int p) { position = p; } @Override public void onClick(View v) { Intent intent = new Intent(this, ShowDefinition.class); startActivity(intent); } } I am not sure that I am doing that right. I added my new activity to the manifest, as well as the activity i extended the listener with: <activity android:name="ShowDefinition" android:label="@string/app_name"> </activity> <activity android:name="OnItemClickListener" android:label="@string/app_name"> </activity> Nonetheless, if I click on an Item in my List, the application always breaks with a NullPointerException. I think I am using the intent wrong... any Ideas? In regard to Nikita Beloglazov's comment: It breaks when I create the Intent: Intent intent = new Intent(this, ShowDefinition.class); Here's the stacktrace: 05-23 22:56:46.629: ERROR/AndroidRuntime(258): Uncaught handler: thread ma

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