When I run my android app in the AVD it gives me an error

Issue

The AVD says "Unfortunately, Service has stopped", where service is the name of my app. Please tell me where I went wrong. I have posted the code of the two files :

MainActivity.java:

public class MainActivity extends Activity {
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Button start, stop;

        start = (Button) findViewById(R.id.Button1);
        stop = (Button) findViewById(R.id.Button2);

        start.setOnClickListener(new View.OnClickListener() {

        @Override

        public void onClick(View v) {

        Intent service = new Intent(MainActivity.this, MyService.class);

        startService(service);

        }

        });

        stop.setOnClickListener(new View.OnClickListener() {

        @Override

          public void onClick(View v) {

        Intent name = new Intent(MainActivity.this, MyService.class);

        stopService(name);

        }

        });

        }

}

MyService.java:

public class MyService extends Service {

    @Override
    public IBinder onBind(Intent arg0) {
            return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        new AlertDialog.Builder(this).setTitle("Argh").setMessage("Watch out!").setNeutralButton("Close", null).show();
        return 0;
    }

    @Override
    public void onDestroy() {

        super.onDestroy();

    }

}

activity_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/Button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="20dp"
        android:text="Play" />

    <Button
        android:id="@+id/Button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/Button1"
        android:layout_alignBottom="@+id/Button1"
        android:layout_centerHorizontal="true"
        android:text="Stop" />

</RelativeLayout>

This is what LogCat says:

04-18 18:48:48.724: E/Trace(852): error opening trace file: No such file or directory (2)
04-18 18:48:49.683: D/gralloc_goldfish(852): Emulator without GPU emulation detected.

The error message is displayed after I click on the start button.

Thanks in advance :)

Solution

I don't think you can generate an AlertDialog in a service without any context to the activity. If you just want to know if the service is started or not, try logging it:

Log.i("MyService","Service started");

And check for it in you logcat by doing:

logcat -s "MyService"

If you want to display an AlertDialog, trying to look at this post.

Answered By - wangyif2