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My application crashes as soon as I start an IntentService. I'm trying to make the intentservice read accelerometer data. I intend to use a partial-wake lock to keep it on even when the screen is off. So the intentService extends from sensorEventListener I've added the COURSE_LOCATION and FINE_LOCATION permissions in the manifest. here's my stack trace
java.lang.RuntimeException: Unable to start service com.shreeasish.safer.SensorIntentService@163c49fe with Intent { cmp=com.shreeasish.safer/.SensorIntentService }: java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Message android.app.IntentService$ServiceHandler.obtainMessage()' on a null object reference
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2941)
at android.app.ActivityThread.access$2100(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1415)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5343)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Message android.app.IntentService$ServiceHandler.obtainMessage()' on a null object reference
at android.app.IntentService.onStart(IntentService.java:116)
at android.app.IntentService.onStartCommand(IntentService.java:130)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2924)
at android.app.ActivityThread.access$2100(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1415)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5343)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
And here's my ServiceIntent class
public class SensorIntentService extends IntentService {
private Sensor mAccelerometer;
private SensorManager mSensorManager;
// public static final String BROADCAST_ACTION = "com.shreeasish.Safer.SERVICE_BROADCAST";
// public static final String ACCELEROMETER_DATA = "com.shreeasish.Safer.ACCELEROMETER_DATA";
@Override
public void onCreate() {
}
public SensorIntentService(String name) {
super(name);
}
public SensorIntentService() {
super("com.shreeasish.Safer");
}
@Override
protected void onHandleIntent(Intent intent) {
}
// @Override
public void onSensorChanged(SensorEvent event) {
}
// @Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}
I haven't added any code yet. So it shouldn't crash should it?
This is the code I'm using to launch it
Intent mServiceIntent = new Intent(getActivity(), SensorIntentService.class);
getActivity().startService(mServiceIntent);
705
IntentService is a base class for Services that handle asynchronous requests (expressed as Intents) on demand. Clients send requests through startService(Intent) calls; the service is started as needed, handles each Intent, in turn, using a worker thread, and stops itself when it runs out of work.
If the task doesn't require any and also not a very long task you can use service. If the Background task is to be performed for a long time we can use the intent service. Service will always run on the main thread. intent service always runs on the worker thread triggered from the main thread.
The IntentService is used to perform a certain task in the background. Once done, the instance of IntentService terminates itself automatically. An example for its usage would be downloading certain resources from the internet.
You need to call the super onCreate() in your SensorIntentService:
@Override
public void onCreate() {
super.onCreate();
}
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