Question

TextView t =(TextView)findViewById(R.id.place); 
t.setText("A");

i call the above code inside onCreate() method. My activity is a ListActivity. But why this gives me the following error

05-04 14:21:40.840: E/AndroidRuntime(16168): Caused by: java.lang.NullPointerException

and here is the XML where i defined TextView

<TextView android:id="@+id/place"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:textSize="16sp"
            android:textStyle="bold" 
            android:focusable="false"
            android:text=""
            android:layout_gravity="left"/>

and how to fix it?

Answer 1

public class yourclass extends Activity{
    TextView t;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            setContentView(R.layout.patient);
            t =(TextView)findViewById(R.id.place); 
            t.setText("A");
    }
}