I have the following codes as below. I am trying to run a simple list view all with not error and output is empty white screen.

**MainActivity.java**

```
public class MainActivity extends ActionBarActivity {

    String[] stateArray = {"jh","kd"};
    private ListView stateListView;
    private ArrayAdapter<string> arrayAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        stateListView = (ListView) findViewById(R.id.state_list);
        arrayAdapter  = new ArrayAdapter<string>(this,android.R.layout.simple_list_item_1);
        stateListView.setAdapter(arrayAdapter);
    }

}

```

**activity\_main.xml**

```
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.lab4_1.MainActivity" >

    <ListView
        android:id="@+id/state_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </ListView>

</RelativeLayout>

```

Al works fine no error and the emulator just show empty which screen nothing inside. What could be missing?