Ich versuche, Googles @ zu folgAktivitätserkennung Beispiel.

Im Beispiel starten sie die Aktivitätserkennung, wenn Sie auf eine Schaltfläche klicken. Ich möchte sie jedoch nur starten, wenn die App gestartet wird. Deshalb habe ich versucht, sie in das @ -Zeichen einzufügeonConnected Methode. Es wird jedoch eine Nullzeigerausnahme ausgelöst.

Hier ist, wie ich es nenne:

@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);
    }
}

Und der Fehler:

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.examp,le.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

Haben Sie eine Idee, was ich anders machen muss, um diesen Fehler zu vermeiden? Andere Ortungsdienste funktionieren einwandfrei - wie Geofencing oder das Anfordern von Aktivitätsaktualisierungen.