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

Your app is looking for the sendMessage() method in an activity where the method is not implimented

java.lang.IllegalStateException:Could not find a method MainActivity.sendMessage(View) in the activity class com.example.myfirstapp.DisplayMessageActivity for onClick handler on view class android.widget.Button

03-15 18:00:03.430: E/AndroidRuntime(592): 

is this the xml layout name activity_display_message_1 where you declare the Button? you must put the method sendMessage also in the same activity

EDIT: FULL SOLUTION

activity_main.xml

activity_display_message.xml

MainActivity

public class MainActivity extends Activity {
public final static String EXTRA_MESSAGE = "com.example.myfirstapp.MESSAGE";
    @Override
         protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
}


    /** Called when the user clicks the Send button */
    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);
        startActivity(intent);
    }
}

DisplayMessageActivity.java

  public class DisplayMessageActivity extends Activity {

    @Override
     protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_display_message_1);


    // Get the message from the intent
    Intent intent = getIntent();
    String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);

    // Create the text view
    TextView textView = new TextView(this);
    textView.setTextSize(40);
    textView.setText(message);
}

}

Update also you manifest file because you've inverse the launcher