Question

Im just making a simple app that will vibrate when the button is clicked, but for some reason when i click the button the app says it unexpectedly stopped and needed to force close, below is the source code to the main java file and i have used the android vibrate permission in my manifest. can someone tell me why every time I click the vibrate button it gives me the error that it unexpectedly stopped?

package com.test;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Vibrator;
import android.view.View;
import android.widget.EditText;

public class Main extends Activity {

public final static String EXTRA_MESSAGE = "com.test.MESSAGE";

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
}

/* Called when the user clicks the 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);
}

public void vibrateMe() {


    Vibrator vibrate = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);

    vibrate.vibrate(500);


}

public void stopVibrating(Vibrator vibrate) {

        vibrate.cancel();
    }
}

Answer 1

You have to change your vibrateMe() to vibrateMe(View v) if you use android:onClick="vibrateMe"

For instance, if you specify android:onClick=”sayHello”, you must
declare a public void sayHello(View v) method of your context
(typically, your Activity).

Check the developer page