Question

I have following main.xml of layout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TextView
    android:id="@+id/textview01"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello" />

and I am trying to retrieve the text i.e. @string/hello by using the following code

   public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);



  TextView tv= (TextView) findViewById(R.id.textview01);
  String input= tv.getText().toString();

  Log.d("Info",input);

but I am not able to see the output. Application is crashing with NULL Exception error at the String input = tv.getText(

Answer 1

You need to call

setContentView(R.layout.main);

before calling findViewById