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我試圖找出Google Play服務爲什麼會在應用程序從諸如設備睡眠或切換其他程序的背景狀態返回後發生nullpointerexception崩潰。有時Google Play服務會在應用程序啓動時提供崩潰彈出窗口。所以我認爲問題在於服務路徑上的某處，因爲rxjava是線程發生的地方。GoogleApiClient不能爲空[Awareness API]
Note: I Inject GoogleApiClient in both MainActivity (field injection) and in GoogleApiService (constructor injection).
GoogleApiClient是作爲@Singleton注入的。我一直在試圖追蹤爲什麼這會發生幾個小時而沒有進展，任何幫助表示讚賞。
應用程序將繼續沒有任何問題需要解決，「谷歌遊戲服務彈出」很討厭，雖然，我看到一個調用getuserLocAndWeather（）的返回失去連接到Google Play服務，但它立刻返回一個有效的結果下一個電話。
MainActivity和GoogleApiService中的實際對象引用永遠不爲null，引用始終是相同的，例如[email protected]，並且在調用時始終連接。
跟蹤：
FATAL EXCEPTION: lowpool[3]
Process: com.google.android.gms.persistent, PID: 12828
java.lang.NullPointerException: GoogleApiClient must not be null
at ilk.a(:com.google.android.gms:73)
at hys.<init>(:com.google.android.gms:115)
at pof.<init>(:com.google.android.gms:86)
at ppz.<init>(:com.google.android.gms:35)
at ppx.<init>(:com.google.android.gms:179)
at ppp.a(:com.google.android.gms:179)
at buc.a(:com.google.android.gms:381)
at jfo.run(:com.google.android.gms:1087)
at itt.run(:com.google.android.gms:453)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at iyg.run(:com.google.android.gms:17)
at java.lang.Thread.run(Thread.java:818)
我的服務等級：，在try {}客戶端打印出來永遠是：true，如果谷歌無關發揮服務崩潰與否。
客戶端：[email protected]已連接？ ：真
public class GoogleApiService implements IGoogleApi{
private GoogleApiClient client;
private static final String TAG = "GoogleApiClient";
@Inject
public GoogleApiService(GoogleApiClient client){
this.client = client;
}
public Observable<UserCurrentInfo> getLocationWeather(){
Observable<WeatherResult> weatherObservable = Observable.create(subscriber -> {
try {
Log.d(TAG,"Trying to get some Weather");
Log.d(TAG,"Client: " + client.toString() + " Connected? :" + client.isConnected());
Awareness.SnapshotApi.getWeather(client)
.setResultCallback(weather -> {
if (!weather.getStatus().isSuccess()) {
subscriber.onError(new Throwable("could not get weather"));
Log.d(TAG," Error getting weather" + weather.getStatus().toString());
} else {
Log.d(TAG,"Getting dem weathers");
subscriber.onNext(weather);
subscriber.onCompleted();
}
});
}catch (SecurityException e){
throw new SecurityException("No permission: " + e);
}
});
Observable<LocationResult> locationObservable = Observable.create(subscriber -> {
try {
Awareness.SnapshotApi.getLocation(client)
.setResultCallback(retrievedLocation -> {
if (!retrievedLocation.getStatus().isSuccess()) {
subscriber.onError(new Throwable("Could not get location."));
Log.d(TAG," Error getting location");
} else {
subscriber.onNext(retrievedLocation);
subscriber.onCompleted();
}
});
}catch (SecurityException e){
throw new SecurityException("No permission: " + e);
}
});
return Observable.zip(weatherObservable, locationObservable,
(weather, location) -> {
return new UserCurrentInfo(weather.getWeather(),location.getLocation());
});
}
主持人：
public class FavouritesPresenter implements BasePresenter<IFavouriteView>{
private IFavouriteView favView;
private String TAG = "FavPresenter";
private Subscription subscription;
private GetUserLocationWeatherUseCase useCase;
@Inject
FavouritesPresenter(GetUserLocationWeatherUseCase wlUseCase){
this.useCase = wlUseCase;
}
@Override
public void onCreate() {
}
@Override
public void onStop(){
if(subscription != null){
subscription.unsubscribe();
}
}
public void getUserLocAndWeather(){
subscription = useCase.execute().subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(info -> {
favView.showText(
formatStringDecimals(info.getWeather().getTemperature(Weather.CELSIUS)+"",2),
info.getWeather().getConditions()[0],
formatStringDecimals(""+info.getLocation().getLatitude(),3),
formatStringDecimals("" + info.getLocation().getLongitude(),3)
);},
err ->{favView.showText("??",0,"","");}
);
}
用例：在mainactivity
public class GetUserLocationWeatherUseCase implements Usecase<UserCurrentInfo> {
IGoogleApi apihelper;
public GetUserLocationWeatherUseCase(IGoogleApi helper){
this.apihelper = helper;
}
@Override
public Observable<UserCurrentInfo> execute(){
return apihelper.getLocationWeather();
}
用法：
@Inject
FavouritesPresenter favouritesPresenter;
GoogleApiClient.ConnectionCallbacks connectionCallbacks;
GoogleApiClient.OnConnectionFailedListener connectionFailedListener;
@Inject
GoogleApiClient mGoogleApiClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
initInjector();
favouritesPresenter.attachView(this);
favouritesPresenter.onCreate();
registerReceiverGPS();
}
@Override
protected void onStart() {
super.onStart();
if (mGoogleApiClient != null){
registerCallbacks(this.mGoogleApiClient);
registerFailedToConnect(this.mGoogleApiClient);
mGoogleApiClient.connect();
}
}
@Override
protected void onStop() {
favouritesPresenter.onStop();
if (mGoogleApiClient != null) {
mGoogleApiClient.unregisterConnectionCallbacks(this.connectionCallbacks);
mGoogleApiClient.unregisterConnectionFailedListener(this.connectionFailedListener);
mGoogleApiClient.disconnect();
}
}
@Override
public void registerCallbacks(GoogleApiClient client){
this.connectionCallbacks = new GoogleApiClient.ConnectionCallbacks() {
@Override
public void onConnected(@Nullable Bundle bundle)
favouritesPresenter.getUserLocAndWeather(); //Call to presenter that initiates the observable chain, actually this comes later after some GPS checks and such, but for easier cohesion
}
@Override
public void onConnectionSuspended(int i) {}
};
client.registerConnectionCallbacks(this.connectionCallbacks);
}
什麼，如果你對你的onCreate（） 添加此如果（GoogleApiClient == NULL）{ GoogleApiClient =新GoogleApiClient.Builder（本） .addConnectionCallbacks（本） .addOnConnectionFailedListener（本） .addApi（LocationServices .API） .build（）; } –
@Tony這已經發生在注入器中，對象本身從來沒有從我看到的實際上是空的，它總是有相同的引用MainActivity和GoogleApiService – buddhabath
什麼時候程序崩潰？ –