@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.message_history_activity); contentList = (ListView) findViewById(R.id.msghistory_content_list); adapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1); contentList.setAdapter(adapter); dbHelper = new DatabaseHelper(this); this.registerReceiver( messageReceiver, new IntentFilter("com.forchild.messages.history.display")); }