IllegalStateException when click on button in android hello world program

Question

I\'m new to android and I\'m trying to implement MyFirstApp given on android google developers site, So app contains one textbox and button, if you enter any text in textfie

Answer 1

public void sendMessage(View view) {
    // Do something in response to button
    Intent intent = new Intent(this, DisplayMessageActivity.class);
    EditText editText = (EditText) findViewById(R.id.edit_message);
    String message = editText.getText().toString();
    intent.putExtra(EXTRA_MESSAGE, message);
    this.startActivity(intent);
}