App crashes onstart with a null pointer exception. this happens when location permission is already granted. However doesnt occur when the location permission is not granted and only given after the app starts.
public void requestLocationUpdates() {
Log.i(TAG, "Requesting location updates");
Utils.setRequestingLocationUpdates(this, true);
startService(new Intent(getApplicationContext(),
LocationUpdatesService.class));
try {
mFusedLocationClient.requestLocationUpdates(mLocationRequest,
mLocationCallback, Looper.myLooper());
} catch (SecurityException unlikely) {
Utils.setRequestingLocationUpdates(this, false);
Log.e(TAG, "Lost location permission. Could not request updates. " +
unlikely);
}
}
Below is the error.
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.example.projectu/com.example.projectu.MainActivity}:
java.lang.NullPointerException: Attempt to invoke virtual method 'void
com.example.projectu.LocationUpdatesService.requestLocationUpdates()' on a
null object reference
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:440)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual
method 'void
com.example.projectu.LocationUpdatesService.requestLocationUpdates()' on a
null object reference
at com.example.projectu.MainActivity.onStart(MainActivity.java:265)
at
android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1334)
at android.app.Activity.performStart(Activity.java:7029)
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2741)
you have not initialized mFusedLocationClient, and calling its mFusedLocationClient.requestLocationUpdates on null object
Related
My app uses a WebView to display some content. Some day I started to receive the following error from my users:
Fatal Exception: java.lang.RuntimeException: Error receiving broadcast Intent { act=android.hardware.usb.action.USB_DEVICE_ATTACHED flg=0x10 pkg=com.chessking.android.learn.ctforbeginners } in org.chromium.media.AudioManagerAndroid$5#13883a1
at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:891)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5420)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by java.lang.NullPointerException: Attempt to invoke virtual method 'int android.hardware.usb.UsbDevice.getInterfaceCount()' on a null object reference
at org.chromium.media.AudioManagerAndroid.hasUsbAudioCommInterface(AudioManagerAndroid.java:1224)
at org.chromium.media.AudioManagerAndroid.access$1200(AudioManagerAndroid.java:43)
at org.chromium.media.AudioManagerAndroid$5.onReceive(AudioManagerAndroid.java:1254)
at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:881)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5420)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
I've looked at AudioManagerAndroid.java code, the error is in line
if (!hasUsbAudioCommInterface(device)) return;
device is null:
....
mUsbAudioReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
UsbDevice device = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (DEBUG) {
logd("UsbDeviceBroadcastReceiver.onReceive: a= " + intent.getAction()
+ ", Device: " + device.toString());
}
// Not a USB audio device.
if (!hasUsbAudioCommInterface(device)) return;
....
How can I avoid the problem without changing chromium sources? My WebView never use audio. Is there a way to do not subscribe for Audio events?
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent.getExtras() != null) {
String temp = intent.getStringExtra("key");
temp1 = Integer.parseInt(temp);
counter = temp1;
}
}
I'm passing data to the service and it works perfectly when the app is open but crashes as soon as i close the app.. I've tried a lot of things and I'm new to android. Any help would be appreciated
Thanks in advance.
Here is the log
03-21 15:35:07.868 21818-21818/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.cs442.shash5259.assignment_6, PID: 21818
java.lang.RuntimeException: Unable to start service com.cs442.shash5259.assignment_6.Myservice#9d88461 with null: java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Bundle android.content.Intent.getExtras()' on a null object reference
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3045)
at android.app.ActivityThread.-wrap17(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1452)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Bundle android.content.Intent.getExtras()' on a null object reference
at com.cs442.shash5259.assignment_6.Myservice.onStartCommand(Myservice.java:55)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3028)
at android.app.ActivityThread.-wrap17(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1452)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Looking at the logs, it is clear that your Intent object in onStartCommand is null, when app is closed.
Looking at the documentation inside the source code of Service, it is mentioned that:
The Intent supplied to onStartCommand may be null if the service
is being restarted after
its process has gone away, and it had previously returned anything
except START_STICKY_COMPATIBILITY.
You can deal with this in at least 2 different ways depending on your app's requirement.
1.You can modify the code as below in your onStartCommand:
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent!= null) {
String temp = intent.getStringExtra("key");
temp1 = Integer.parseInt(temp);
counter = temp1;
}
}
This will prevent the crash but will not update the counter
2.Or you may return START_REDELIVER_INTENT in the onStartCommand() callback in service so that the entire intent is sent following a restart, thus preventing Intent from being null.
From my mobile I am starting a foreground service in my android watch. I am able to do that correctly. But when I try to stop the service as well as the activity in watch , I am getting an error message( watch app is crashing). I am using message listener service to receive the message from mobile.
I also have a stop button in watch app which is running perfectly(if I try to stop the service from watch itself) and it has the same lines of code. I am not sure where I am wrong when I receive message from mobile app to stop the foreground service.
#Override public void onMessageReceived(MessageEvent messageEvent) {
Log.i(INFOTAG, "Stop msg received");
if(messageEvent.getPath().equals(STOP_MESSAGE_PATH_2)){
started = false;
Intent stopIntent = new Intent(
MainActivity.this, ForegroundService.class);
stopService(stopIntent);
this.finish();
}
}
Below is the error log I am getting:
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference
at android.content.ContextWrapper.getPackageName(ContextWrapper.java:132)
at android.content.ComponentName.(ComponentName.java:77)
at android.content.Intent.(Intent.java:4160)
at com.magi.magidemo.MainActivity.onMessageReceived(MainActivity.java:464)
at com.google.android.gms.wearable.internal.zzcf$5.zza(Unknown Source)
at com.google.android.gms.wearable.internal.zzcf$5.zzs(Unknown Source)
at com.google.android.gms.internal.zzmn.zzb(Unknown Source)
at com.google.android.gms.internal.zzmn$zza.handleMessage(Unknown Source)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
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:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
You need to get the Activity's instance from the override method.
Like this:
public MainActivity activity;
// in the override method
this.activity = activity;
Then use it:
Intent stopIntent = new Intent(
activity, ForegroundService.class);
Have a look: android.content.Context.getPackageName()' on a null object reference
This is my Service getting called on button click from an Activity. If I swipe my Activity left while Service is running it crashes. I have also tried running it in separate process by putting in android:process=":remote" in the manifest but it is still the same.
#Override
public void onCreate(){
super.onCreate();
Log.d("Service", "Creating");
}
#Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
return null;
}
#Override
public int onStartCommand (Intent intent, int flags, int startId)
{
super.onStartCommand(intent, flags, startId);
Log.d("Started", "Service");
type = intent.getIntExtra("Type",-1);
mode = intent.getIntExtra("Mode",-1);
rank = intent.getIntExtra("Rank", -1);
latitude = intent.getDoubleExtra("Lat", -1.0);
longitude = intent.getDoubleExtra("Long", -1.0);
startTime = intent.getLongExtra("Start", 0);
endTime = intent.getLongExtra("End", 0);
The error I am getting is:
java.lang.RuntimeException: Unable to start service com.routofy.routofytest.MyLocationService#374afe93 with null: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.content.Intent.getIntExtra(java.lang.String, int)' on a null object reference
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2913)
at android.app.ActivityThread.access$2100(ActivityThread.java:148)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1390)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5312)
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:901)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.content.Intent.getIntExtra(java.lang.String, int)' on a null object reference
at com.routofy.routofytest.MyLocationService.onStartCommand(MyLocationService.java:89)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2896)
at android.app.ActivityThread.access$2100(ActivityThread.java:148)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1390)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5312)
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:901)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
That is null pointer on type = intent.getIntExtra("Type",-1);
I understand that killing the app is killing the process and Intent this Service is getting is coming out to be null. But how to handle such cases that even if Activity is killed Intent is handed over to Service?
I want service to be totally independent of Activity. Also I am running it like:
Intent pickIntent = new Intent(getApplicationContext(),MyLocationService.class);
I understand that killing the app is killing the process and intent this service is getting is coming out to be null.
Since you haven't posted the return value of onStartCommand() I believe that it's START_STICKY meaning that the service is recreated by the system with null Intent passed in.
But how to handle such cases that even if activity is killed intent is handed over to service.
Just return START_REDELIVER_INTENT flag, which means that:
"If the system kills the service after onStartCommand() returns, recreate the service and call onStartCommand() with the last intent that was delivered to the service."
I have following code
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
if(intent != null) {
Log.i("INTENT", intent.getAction().toString());
}
return START_STICKY;
}
but it always returns NullPointerException on line:
Log.i("INTENT", intent.getAction().toString());
Why? I'm checking above if "intent" variable is not null. If that's the case execute following code. But i still got nullpointerexception.
Service is started from activity like that:
startService(new Intent(this, MainService.class));
What am I doing wrong?
You are getting a NullPointerException because intent.getAction() seems to return null.
You should extend your check to this:
if(intent != null && intent.getAction() != null) {
If you want to add an Action to your intent you need to call setAction():
Intent i = new Intent(this, MainService.class);
i.setAction("foo");
startService(i);
I got the similar stack，add the check
intent.getAction() != null
it worked.
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.languoguang.welcomeapp, PID: 17676
java.lang.RuntimeException: Unable to start service com.example.languoguang.welcomeapp.CountService#f6049d4 with Intent { cmp=com.example.languoguang.welcomeapp/.CountService }: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toString()' on a null object reference
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3698)
at android.app.ActivityThread.access$1500(ActivityThread.java:198)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1668)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6649)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:826)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toString()' on a null object reference
at com.example.languoguang.welcomeapp.CountService.onStartCommand(CountService.java:24)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3679)
at android.app.ActivityThread.access$1500(ActivityThread.java:198)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1668)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6649)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:826)
I/Process: Sending signal. PID: 17676 SIG: 9