I'm attempting to follow Google's Activity Recognition example.
In the example they start the activity recognition when you click a button, however I'd like to just start it up when the app starts - so I tried putting it in the onConnected
method. However, it ends up throwing a null pointer exception.
Here's how I'm calling it:
@Override
public void onConnected(Bundle connectionHint) {
Log.d(TAG, "onConnected");
try {
ActivityRecognition.ActivityRecognitionApi.requestActivityUpdates(
mGoogleApiClient,
UPDATE_INTERVAL_IN_MILLISECONDS,
getActivityDetectionPendingIntent()
).setResultCallback(this);
} catch (SecurityException securityException) {
logSecurityException(securityException);
}
}
And the error:
03-21 20:28:57.939 2340-2340/getrewards.example.com.getrewards E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: getrewards.example.com.getrewards, PID: 2340
java.lang.NullPointerException: Appropriate Api was not requested.
at com.google.android.gms.internal.jx.b(Unknown Source)
at com.google.android.gms.common.api.c.a(Unknown Source)
at com.google.android.gms.common.api.c.a(Unknown Source)
at com.google.android.gms.common.api.c.b(Unknown Source)
at com.google.android.gms.internal.nb.requestActivityUpdates(Unknown Source)
at getrewards.example.com.getrewards.RewardsFragment.onConnected(RewardsFragment.java:274)
at com.google.android.gms.internal.jm.f(Unknown Source)
at com.google.android.gms.common.api.c.gJ(Unknown Source)
at com.google.android.gms.common.api.c.d(Unknown Source)
at com.google.android.gms.common.api.c$2.onConnected(Unknown Source)
at com.google.android.gms.internal.jm.f(Unknown Source)
at com.google.android.gms.internal.jm.dU(Unknown Source)
at com.google.android.gms.internal.jl$h.b(Unknown Source)
at com.google.android.gms.internal.jl$h.g(Unknown Source)
at com.google.android.gms.internal.jl$b.hy(Unknown Source)
at com.google.android.gms.internal.jl$a.handleMessage(Unknown Source)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
03-21 20:28:58.343 1235-1594/system_process E/ActivityManager﹕ Invalid thumbnail dimensions: 288x288
03-21 20:29:02.543 1235-1267/system_process E/InputDispatcher﹕ channel '39825fb6 getrewards.example.com.getrewards/getrewards.example.com.getrewards.RewardsActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
03-21 20:33:31.053 2374-2374/? E/memtrack﹕ Couldn't load memtrack module (No such file or directory)
03-21 20:33:31.053 2374-2374/? E/android.os.Debug﹕ failed to load memtrack module: -2
03-21 20:33:44.213 2403-2403/? E/memtrack﹕ Couldn't load memtrack module (No such file or directory)
03-21 20:33:44.213 2403-2403/? E/android.os.Debug﹕ failed to load memtrack module: -2
03-21 20:34:56.658 2479-2479/? E/memtrack﹕ Couldn't load memtrack module (No such file or directory)
03-21 20:34:56.659 2479-2479/? E/android.os.Debug﹕ failed to load memtrack module: -2
03-21 20:35:09.756 2501-2501/? E/memtrack﹕ Couldn't load memtrack module (No such file or directory)
03-21 20:35:09.756 2501-2501/? E/android.os.Debug﹕ failed to load memtrack module: -2
03-21 20:35:52.821 2563-2563/? E/memtrack﹕ Couldn't load memtrack module (No such file or directory)
03-21 20:35:52.821 2563-2563/? E/android.os.Debug﹕ failed to load memtrack module: -2
03-21 20:35:53.299 1235-1267/system_process E/InputDispatcher﹕ channel '21589154 getrewards.example.com.getrewards/getrewards.example.com.getrewards.RewardsActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
03-21 20:36:06.753 2586-2586/? E/memtrack﹕ Couldn't load memtrack module (No such file or directory)
03-21 20:36:06.753 2586-2586/? E/android.os.Debug﹕ failed to load memtrack module: -2
03-21 20:36:29.956 2634-2634/? E/memtrack﹕ Couldn't load memtrack module (No such file or directory)
03-21 20:36:29.956 2634-2634/? E/android.os.Debug﹕ failed to load memtrack module: -2
03-21 20:36:43.621 2657-2657/? E/memtrack﹕ Couldn't load memtrack module (No such file or directory)
03-21 20:36:43.621 2657-2657/? E/android.os.Debug﹕ failed to load memtrack module: -2
Any ideas what I need to do differently to avoid this error? Other location services work just fine - like geofencing or requesting activity updates.
In Java, the java. lang. NullPointerException is thrown when a reference variable is accessed (or de-referenced) and is not pointing to any object. This error can be resolved by using a try-catch block or an if-else condition to check if a reference variable is null before dereferencing it.
How to fix the NullPointerException? To avoid NullPointerException we have to initialize the Textview component with the help of findviewbyid( ) method as shown below. The findViewbyId( ) takes the “id” value of the component as the parameter. This method helps locate the component present in the app.
java.lang.NullPointerException. Thrown when an application attempts to use null in a case where an object is required. These include: Calling the instance method of a null object. Accessing or modifying the field of a null object.
The problem ended up that I was adding the LocationServices.API to the Google API Client, but I wasn't adding ActivityRecognition.API. After I updated my call to this, it worked:
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.addApi(ActivityRecognition.API)
.build();
}
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