unable to create the service ,it gives null pointer exception

[sameera liyanage]

here is my main class

package intent.filters;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class IntentExamples extends Activity implements OnClickListener {
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		Button Activity1 = (Button) findViewById(R.id.Button01);
		Activity1.setOnClickListener(this);

		Button startButton = (Button) findViewById(R.id.startButton);
		startButton.setOnClickListener(this);

		Button stopButton = (Button) findViewById(R.id.stopButton);
		stopButton.setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {

		//Intent myIntent =new Intent(v.getContext(), DigitalClock.class);
			///startActivityForResult(myIntent, 0);
		if(v.getId()==R.id.Button01){
		Intent myIntent =new Intent(this, DigitalClock.class);
		startActivity(myIntent);
		}
		
		if(v.getId()==R.id.startButton){
			startService(new Intent(getBaseContext(), MediaPlayerService.class));
			
			}
			
		if(v.getId()==R.id.stopButton){
			stopService(new Intent(getBaseContext(), MediaPlayerService.class));
			}
			
	}
}

here is service class

package intent.filters;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;

public class MediaPlayerService extends Service {

	MediaPlayer myMediaPlayer;

	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void onCreate() {
		myMediaPlayer = MediaPlayer.create(this, R.raw.mindtaffy);
		myMediaPlayer.setLooping(true);
	}

	@Override
	public void onStart(Intent intent, int startid) {
		myMediaPlayer.start();
	}

	@Override
	public void onDestroy() {
		myMediaPlayer.stop();
	}

}

here is manifest.xml file

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="intent.filters"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="3" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".IntentExamples"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
	<activity android:name=".DigitalClock"></activity>
	<service android:enabled="true" android:name=".MediaPlayerService" />
    </application>
</manifest>

here is exception in logcat

07-21 18:22:28.880: WARN/dalvikvm(573): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
07-21 18:22:28.900: ERROR/AndroidRuntime(573): FATAL EXCEPTION: main
07-21 18:22:28.900: ERROR/AndroidRuntime(573): java.lang.RuntimeException: Unable to create service intent.filters.MediaPlayerService: java.lang.NullPointerException
07-21 18:22:28.900: ERROR/AndroidRuntime(573):     at android.app.ActivityThread.handleCreateService(ActivityThread.java:2969)
07-21 18:22:28.900: ERROR/AndroidRuntime(573):     at android.app.ActivityThread.access$3300(ActivityThread.java:125)
07-21 18:22:28.900: ERROR/AndroidRuntime(573):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2087)
07-21 18:22:28.900: ERROR/AndroidRuntime(573):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-21 18:22:28.900: ERROR/AndroidRuntime(573):     at android.os.Looper.loop(Looper.java:123)
07-21 18:22:28.900: ERROR/AndroidRuntime(573):     at android.app.ActivityThread.main(ActivityThread.java:4627)
07-21 18:22:28.900: ERROR/AndroidRuntime(573):     at java.lang.reflect.Method.invokeNative(Native Method)
07-21 18:22:28.900: ERROR/AndroidRuntime(573):     at java.lang.reflect.Method.invoke(Method.java:521)
07-21 18:22:28.900: ERROR/AndroidRuntime(573):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
07-21 18:22:28.900: ERROR/AndroidRuntime(573):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
07-21 18:22:28.900: ERROR/AndroidRuntime(573):     at dalvik.system.NativeStart.main(Native Method)
07-21 18:22:28.900: ERROR/AndroidRuntime(573): Caused by: java.lang.NullPointerException
07-21 18:22:28.900: ERROR/AndroidRuntime(573):     at intent.filters.MediaPlayerService.onCreate(MediaPlayerService.java:21)
07-21 18:22:28.900: ERROR/AndroidRuntime(573):     at android.app.ActivityThread.handleCreateService(ActivityThread.java:2959)
07-21 18:22:28.900: ERROR/AndroidRuntime(573):     ... 10 more
07-21 18:22:28.940: WARN/ActivityManager(58):   Force finishing activity intent.filters/.IntentExamples
07-21 18:22:29.490: WARN/ActivityManager(58): Activity pause timeout for HistoryRecord{44f9b5c8 intent.filters/.IntentExamples}

[andrew chou]

guess u'r testing it on Virtual Machine.
add the following part to the onCreate of your Service,you'll understand:

if(player == null) System.out.println(" MediaPlayer not surported here ");

Good luck!