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Flutter E/EventChannel : Failed to open event stream System services not available to Activities before onCreate()

I can't solve this problem. I want to write a flutter plugin for connecting to scales via bluetooth, but the scales sdk It's being used through the activity page, so I tried to find information about the activity usage in the flutter plugin, so I tried to run it. ActivityAware But I can't run the SDK and I can't pass values from extend class of sdk into EventChanel and can't send back to stream flutter.
this Logcat Error
2022-09-03 01:35:18.966 7973-7973/com.example.releep_scale_connect_example E/EventChannel#scan_releep_scale: Failed to open event stream
java.lang.IllegalStateException: System services not available to Activities before onCreate()
at android.app.Activity.getSystemService(Activity.java:6916)
at aicare.net.cn.iweightlibrary.bleprofile.BleProfileServiceReadyActivity.isBLEEnabled(BleProfileServiceReadyActivity.java:299)
at aicare.net.cn.iweightlibrary.bleprofile.BleProfileServiceReadyActivity.startScan(BleProfileServiceReadyActivity.java:329)
at com.example.releep_scale_connect.ReleepScaleConnectPlugin.onListen(ReleepScaleConnectPlugin.java:156)
at io.flutter.plugin.common.EventChannel$IncomingStreamRequestHandler.onListen(EventChannel.java:218)
at io.flutter.plugin.common.EventChannel$IncomingStreamRequestHandler.onMessage(EventChannel.java:197)
at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:178)
at io.flutter.embedding.engine.dart.DartMessenger.lambda$handleMessageFromDart$0$DartMessenger(DartMessenger.java:206)
at io.flutter.embedding.engine.dart.-$$Lambda$DartMessenger$6ZD1MYkhaLxyPjtoFDxe45u43DI.run(Unknown Source:12)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:236)
at android.app.ActivityThread.main(ActivityThread.java:8051)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:620)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1011)
2022-09-03 01:35:18.978 7973-7973/com.example.releep_scale_connect_example W/Looper: PerfMonitor longMsg : seq=135 plan=01:35:17.167 late=0ms wall=1800ms running=24ms runnable=1ms h=android.os.Handler c=io.flutter.embedding.engine.dart.-$$Lambda$DartMessenger$6ZD1MYkhaLxyPjtoFDxe45u43DI procState=2
this my plugin (ReleepScaleConnectPlugin.java)
I want this SDK to be in flutter plugin format.
this github SDK : https://github.com/evanwork1234/AiFitSDK
public class ReleepScaleConnectPlugin extends BleProfileServiceReadyActivity implements FlutterPlugin, EventChannel.StreamHandler, MethodCallHandler, ActivityAware {
private FlutterActivity activity;
private MethodChannel channel;
private EventChannel stream_chanel;
private DeviceDialog devicesDialog;
private BinaryMessenger binaryMessenger;
private String[] permissionArray = new String[] {
Manifest.permission.BLUETOOTH,
Manifest.permission.BLUETOOTH_ADMIN,
Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.INTERNET,
Manifest.permission.ACCESS_NETWORK_STATE
};
#Override
public void onAttachedToEngine(#NonNull FlutterPluginBinding flutterPluginBinding) {
binaryMessenger = flutterPluginBinding.getBinaryMessenger();
}
#Override
public void onMethodCall(#NonNull MethodCall call, #NonNull Result result) {
if (call.method.equals("getPlatformVersion")) {
result.success("Android " + android.os.Build.VERSION.RELEASE);
} else {
result.notImplemented();
}
}
#Override
public void onDetachedFromEngine(#NonNull FlutterPluginBinding binding) {
channel.setMethodCallHandler(null);
}
ArrayList listVal = new ArrayList();
private Gson gson = new Gson();
#Override
public void onListen(Object arguments, EventChannel.EventSink events) {
if (arguments.equals("scan")) {
// devicesDialog.startScan();
startScan();
String json = gson.toJson(listVal);
events.success(json);
}
}
#Override
public void onCancel(Object arguments) {
}
#Override
protected void onError(String s, int i) {
L.e("TAG", "Message = " + s + " errCode = " + i);
// showInfo(getString(R.string.state_error, errMsg, errCode), true);
}
#Override
protected void onGetWeightData(WeightData weightData) {
}
#Override
protected void onGetResult(int i, String s) {
}
#Override
protected void onServiceBinded(WBYService.WBYBinder wbyBinder) {
}
#Override
protected void onServiceUnbinded() {
}
#Override
protected void getAicareDevice(BroadData broadData) {
if (broadData != null) {
L.e("TAG", broadData.toString());
listVal.add(broadData.toString());
}
}
private void startLeScan() {
startScan();
}
private void stopLeScan() {
stopScan();
}
#Override
public void onAttachedToActivity(#NonNull #NotNull ActivityPluginBinding binding) {
L.e("TAG", "onAttachedToActivity");
activity = (FlutterActivity) binding.getActivity();
AiFitSDK.getInstance().init (activity);
channel = new MethodChannel(binaryMessenger, "releep_scale_connect");
channel.setMethodCallHandler(this);
stream_chanel = new EventChannel(binaryMessenger, "scan_releep_scale");
stream_chanel.setStreamHandler(this);
boolean backBoolean = PermissionUtils.checkPermissionArray(activity.getContext(), permissionArray, 3);
// initPermissions();
// Judge whether Bluetooth is on, if you need to change the style, you can do it yourself
if (!isBLEEnabled()) {
showBLEDialog();
}
//startScan();
// devicesDialog = new DeviceDialog(activity.getContext(), this);
}
#Override
public void onDetachedFromActivityForConfigChanges() {
L.e("TAG", "onDetachedFromActivityForConfigChanges");
}
#Override
public void onReattachedToActivityForConfigChanges(#NonNull #NotNull ActivityPluginBinding binding) {
L.e("TAG", "onReattachedToActivityForConfigChanges");
}
#Override
public void onDetachedFromActivity() {
L.e("TAG", "onDetachedFromActivity");
}
}
I want these override methods to be able to pass values back to flutter.
#Override
protected void onGetWeightData(WeightData weightData) {
}
#Override
protected void onGetResult(int i, String s) {
}
#Override
protected void onGetFatData(boolean b, BodyFatData bodyFatData) {
}

Get latitude and longitude from onSuccess(LocationEngineResult result) [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 2 years ago.
I get user current location by using override method
public void onSuccess(LocationEngineResult result) {
location = Point.fromLngLat(result.getLastLocation().getLongitude(),result.getLastLocation().getLatitude());
}
but I don't know how to replace the latitude and longitude on variable
private final Point ROUTE_ORIGIN=Point.fromLngLat(location.longitude(),location.latitude());
with the location i get from public void onSuccess(LocationEngineResult result) is there any solution for this?
The app crashed with error
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'double com.mapbox.geojson.Point.longitude()' on a null object reference
Can anyone give me some idea or solution? I tried to find sources but still can't solve it.
public class ArActivity extends BaseActivity implements RouteListener, ProgressChangeListener, OffRouteListener {
private static final String TAG = ArActivity.class.getSimpleName();
// Handles navigation.
private MapboxNavigation mapboxNavigation;
// Fetches route from points.
private RouteFetcher routeFetcher;
private RouteProgress lastRouteProgress;
private PermissionsManager permissionsManager;
private LocationEngine locationEngine;
private LocationEngineCallback<LocationEngineResult> locationCallback;
public Point location;
private boolean visionManagerWasInit = false;
private boolean navigationWasStarted = false;
TextView tvlocation;
// This dummy points will be used to build route. For real world test this needs to be changed to real values for
// source and target location
private final Point ROUTE_ORIGIN=Point.fromLngLat(location.longitude(),location.latitude());
private final Point ROUTE_DESTINATION = Point.fromLngLat(101.769116, 2.923220);
#Override
protected void initViews() {
setContentView(R.layout.activity_ar_navigation);
tvlocation = findViewById(R.id.location);
}
#Override
protected void onPermissionsGranted() {
startVisionManager();
startNavigation();
}
#Override
protected void onStart() {
super.onStart();
startVisionManager();
startNavigation();
}
#Override
protected void onStop() {
super.onStop();
stopVisionManager();
stopNavigation();
}
private void startVisionManager() {
if (allPermissionsGranted() && !visionManagerWasInit) {
// Create and start VisionManager.
VisionManager.create();
VisionManager.setModelPerformanceConfig(new Merged(new On(ModelPerformanceMode.DYNAMIC, ModelPerformanceRate.LOW)));
VisionManager.start();
VisionManager.setVisionEventsListener(new VisionEventsListener() {
#Override
public void onAuthorizationStatusUpdated(#NotNull AuthorizationStatus authorizationStatus) {
}
#Override
public void onFrameSegmentationUpdated(#NotNull FrameSegmentation frameSegmentation) {
}
#Override
public void onFrameDetectionsUpdated(#NotNull FrameDetections frameDetections) {
}
#Override
public void onFrameSignClassificationsUpdated(#NotNull FrameSignClassifications frameSignClassifications) {
}
#Override
public void onRoadDescriptionUpdated(#NotNull RoadDescription roadDescription) {
}
#Override
public void onWorldDescriptionUpdated(#NotNull WorldDescription worldDescription) {
}
#Override
public void onVehicleStateUpdated(#NotNull VehicleState vehicleState) {
}
#Override
public void onCameraUpdated(#NotNull Camera camera) {
}
#Override
public void onCountryUpdated(#NotNull Country country) {
}
#Override
public void onUpdateCompleted() {
}
});
VisionArView visionArView = findViewById(R.id.mapbox_ar_view);
// Create VisionArManager.
VisionArManager.create(VisionManager.INSTANCE);
visionArView.setArManager(VisionArManager.INSTANCE);
visionArView.setFenceVisible(true);
visionManagerWasInit = true;
}
}
private void stopVisionManager() {
if (visionManagerWasInit) {
VisionArManager.destroy();
VisionManager.stop();
VisionManager.destroy();
visionManagerWasInit = false;
}
}
private void startNavigation() {
if (allPermissionsGranted() && !navigationWasStarted) {
// Initialize navigation with your Mapbox access token.
mapboxNavigation = new MapboxNavigation(
this,
getString(R.string.mapbox_access_token),
MapboxNavigationOptions.builder().build()
);
// Initialize route fetcher with your Mapbox access token.
routeFetcher = new RouteFetcher(this, getString(R.string.mapbox_access_token));
routeFetcher.addRouteListener(this);
locationEngine = LocationEngineProvider.getBestLocationEngine(this);
LocationEngineRequest arLocationEngineRequest = new LocationEngineRequest.Builder(0)
.setPriority(LocationEngineRequest.PRIORITY_HIGH_ACCURACY)
.setFastestInterval(1000)
.build();
locationCallback = new LocationEngineCallback<LocationEngineResult> () {
#Override
public void onSuccess(LocationEngineResult result) {
location = Point.fromLngLat(result.getLastLocation().getLongitude(),result.getLastLocation().getLatitude());
}
#Override
public void onFailure(#NonNull Exception exception) {
}
};
try {
locationEngine.requestLocationUpdates(arLocationEngineRequest, locationCallback, Looper.getMainLooper());
} catch (SecurityException se) {
VisionLogger.Companion.e(TAG, se.toString());
}
initDirectionsRoute();
// Route need to be reestablished if off route happens.
mapboxNavigation.addOffRouteListener(this);
mapboxNavigation.addProgressChangeListener(this);
navigationWasStarted = true;
}
}
private void stopNavigation() {
if (navigationWasStarted) {
locationEngine.removeLocationUpdates(locationCallback);
mapboxNavigation.removeProgressChangeListener(this);
mapboxNavigation.removeOffRouteListener(this);
mapboxNavigation.stopNavigation();
navigationWasStarted = false;
}
}
private void initDirectionsRoute() {
// Get route from predefined points.
NavigationRoute.builder(this)
.accessToken(getString(R.string.mapbox_access_token))
.origin(ROUTE_ORIGIN)
.destination(ROUTE_DESTINATION)
.build()
.getRoute(new Callback<DirectionsResponse>() {
#Override
public void onResponse(Call<DirectionsResponse> call, Response<DirectionsResponse> response) {
if (response.body() == null || response.body().routes().isEmpty()) {
return;
}
// Start navigation session with retrieved route.
DirectionsRoute route = response.body().routes().get(0);
mapboxNavigation.startNavigation(route);
// Set route progress.
VisionArManager.setRoute(new Route(
getRoutePoints(route),
route.duration().floatValue(),
"",
""
));
}
#Override
public void onFailure(Call<DirectionsResponse> call, Throwable t) {
}
});
}
#Override
public void onErrorReceived(Throwable throwable) {
if (throwable != null) {
throwable.printStackTrace();
}
mapboxNavigation.stopNavigation();
Toast.makeText(this, "Can not calculate the route requested", Toast.LENGTH_SHORT).show();
}
#Override
public void onResponseReceived(#NotNull DirectionsResponse response, RouteProgress routeProgress) {
mapboxNavigation.stopNavigation();
if (response.routes().isEmpty()) {
Toast.makeText(this, "Can not calculate the route requested", Toast.LENGTH_SHORT).show();
} else {
DirectionsRoute route = response.routes().get(0);
mapboxNavigation.startNavigation(route);
// Set route progress.
VisionArManager.setRoute(new Route(
getRoutePoints(route),
(float) routeProgress.durationRemaining(),
"",
""
));
}
}
#Override
public void onProgressChange(Location location, RouteProgress routeProgress) {
lastRouteProgress = routeProgress;
}
#Override
public void userOffRoute(Location location) {
routeFetcher.findRouteFromRouteProgress(location, lastRouteProgress);
}
private RoutePoint[] getRoutePoints(#NotNull DirectionsRoute route) {
ArrayList<RoutePoint> routePoints = new ArrayList<>();
List<RouteLeg> legs = route.legs();
if (legs != null) {
for (RouteLeg leg : legs) {
List<LegStep> steps = leg.steps();
if (steps != null) {
for (LegStep step : steps) {
RoutePoint point = new RoutePoint((new GeoCoordinate(
step.maneuver().location().latitude(),
step.maneuver().location().longitude()
)), mapToManeuverType(step.maneuver().type()));
routePoints.add(point);
List<Point> geometryPoints = buildStepPointsFromGeometry(step.geometry());
for (Point geometryPoint : geometryPoints) {
point = new RoutePoint((new GeoCoordinate(
geometryPoint.latitude(),
geometryPoint.longitude()
)), ManeuverType.None);
routePoints.add(point);
}
}
}
}
}
return routePoints.toArray(new RoutePoint[0]);
}
private List<Point> buildStepPointsFromGeometry(String geometry) {
return PolylineUtils.decode(geometry, Constants.PRECISION_6);
}
private ManeuverType mapToManeuverType(#Nullable String maneuver) {
if (maneuver == null) {
return ManeuverType.None;
}
switch (maneuver) {
case "turn":
return ManeuverType.Turn;
case "depart":
return ManeuverType.Depart;
case "arrive":
return ManeuverType.Arrive;
case "merge":
return ManeuverType.Merge;
case "on ramp":
return ManeuverType.OnRamp;
case "off ramp":
return ManeuverType.OffRamp;
case "fork":
return ManeuverType.Fork;
case "roundabout":
return ManeuverType.Roundabout;
case "exit roundabout":
return ManeuverType.RoundaboutExit;
case "end of road":
return ManeuverType.EndOfRoad;
case "new name":
return ManeuverType.NewName;
case "continue":
return ManeuverType.Continue;
case "rotary":
return ManeuverType.Rotary;
case "roundabout turn":
return ManeuverType.RoundaboutTurn;
case "notification":
return ManeuverType.Notification;
case "exit rotary":
return ManeuverType.RotaryExit;
default:
return ManeuverType.None;
}
}

At the point of instantiating this line (i.e. when the class loads):
private final Point ROUTE_ORIGIN=Point.fromLngLat(location.longitude(),location.latitude());
The location variable you are using is set to nothing:
public Point location;
Aka, it is null and you are getting a NullPointerException.
You should either not try to use the location object until it is instantiated, setting your routeOrigin later on. Or change the ROUTE_ORIGIN to use a static location, the same way you have for ROUTE_DESTINATION.

Memory leak issues in Fragment

I have implemented MVP pattern in my app. And I'm using WeakReferences to store View's reference in my Presenter. But still my fragments are not being claimed by GC upon destroying. Below is the screenshot of problem. Any idea what is causing this and how to remove this issue?
Below is the code for my Presenter:
public class ProductDetailPresenter implements ProductDetailContract.Presenter {
private final WeakReference<ProductDetailContract.View> view;
private CategoriesDataSource repo;
public ProductDetailPresenter(ProductDetailContract.View view, CategoriesDataSource repo) {
this.view = new WeakReference<>(view);
this.repo = repo;
view.setPresenter(this);
}
#Override
public void start() {
}
#Override
public void submitRating(final Product product, final float mRating) {
final ProductDetailContract.View view =ProductDetailPresenter.this.view.get();
if (view != null) {
repo.submitRating(product.getId(), mRating, true, new CategoriesDataSource.SubmitRatingCallback() {
#Override
public void onRatingSubmitted() {
product.setRating(mRating);
product.setRated(true);
product.setUpdatedAt(new Date(System.currentTimeMillis()));
repo.updateProductInDB(product);
if (!view.isActive()) return;
view.onRatingSubmitted(true, mRating);
}
#Override
public void onError(Throwable throwable) {
if (!view.isActive()) return;
view.onRatingSubmitted(false, 0);
}
});
}
}
#Override
public void onRateKarenClicked() {
ProductDetailContract.View view = this.view.get();
if (view != null) {
view.openDialog();
}
}
#Override
public void onAbhiKhareediyeClicked(Product product) {
EventBus.getDefault().post(
new ProductDetailContract.ContractEventMessages(
ProductDetailContract.ContractEventMessages.EVENT_START_QUANTITY_SCREEN, product));
}
}

This is the problem:
#Override
public void submitRating(final Product product, final float mRating) {
final ProductDetailContract.View view =ProductDetailPresenter.this.view.get(); <-- this is bad
you have a final object that is being passed to the repo. Delete the whole line. You don't need it. Use in the view.get() inside the onRatingSubmitted and onError

Using Dagger 2 in SyncAdapter class

I am using Sync Adapter along with Dagger 2 for dependency injection. I am stuck since I cannot seem to figure out where should I use XYZ.inject since SyncAdapter class does not provide OnCreate or an Activity to stick to. Can someone suggest how to deal with Dependency injection in case of Sync Adapter alike classes which do not belong to activity/fragment?
PS: I have looked at several similar questions but failed to find a solution to my problem.
SyncAdapter.java
public class SyncAdapter extends AbstractThreadedSyncAdapter {
ContentResolver mContentResolver;
//Injects here
#Inject
SyncCenterPresenter mSyncCenterPresenter;
private final AccountManager mAccountManager;
Context context;
public SyncAdapter(Context context, boolean autoInitialize) {
super(context, autoInitialize);
mContentResolver = context.getContentResolver();
mAccountManager = AccountManager.get(context);
this.context=context;
}
Account mainAccount;
public static final int SYNC_INTERVAL = 60 * 1;
public static final int SYNC_FLEXTIME = SYNC_INTERVAL/3;
#Override
public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) {
Log.v("Sync class me","sync adapter on perform sync");
if (mSyncCenterPresenter == null){
Log.v("messsage","null");
} else {
Log.v("messsage","not null");
mSyncCenterPresenter.loadDatabaseCenterPayload();
mSyncCenterPresenter.syncPayload();
}
}
/**
* Helper method to schedule the sync adapter periodic execution
*/
public static void configurePeriodicSync(Context context, int syncInterval, int flexTime) {
Account account = myAccount;
String authority = "com.mifos.provider";
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
// we can enable inexact timers in our periodic sync
SyncRequest request = new SyncRequest.Builder().
syncPeriodic(syncInterval, flexTime).
setSyncAdapter(account, authority).
setExtras(new Bundle()).build();
ContentResolver.requestSync(request);
} else {
ContentResolver.addPeriodicSync(account,
authority, new Bundle(), syncInterval);
}
}
static Account myAccount;
public static void onAccountCreated(Account newAccount, Context context) {
/*
* Since we've created an account
*/
myAccount = newAccount;
SyncAdapter.configurePeriodicSync(context, SYNC_INTERVAL, SYNC_FLEXTIME);
/*
* Without calling setSyncAutomatically, our periodic sync will not be enabled.
*/
ContentResolver.setSyncAutomatically(newAccount, "com.mifos.provider", true);
/*
* Finally, let's do a sync to get things started
*/
syncImmediately(context);
}
public static Account getSyncAccount(Context context) {
// Create the account type and default account
Account newAccount = new Account(
context.getString(R.string.app_name), "com.mifos");
return newAccount;
}
/**
* Helper method to have the sync adapter sync immediately
* #param context The context used to access the account service
*/
public static void syncImmediately(Context context) {
Bundle bundle = new Bundle();
bundle.putBoolean(ContentResolver.SYNC_EXTRAS_EXPEDITED, true);
bundle.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true);
ContentResolver.requestSync(getSyncAccount(context),
"com.mifos.provider", bundle);
}
}
SyncCenterPresenter.java
public class SyncCenterPresenter {
private final DataManagerCenter mDataManagerCenter;
private CompositeSubscription mSubscriptions;
List<CenterPayload> centerPayloads;
int mCenterSyncIndex = 0;
#Inject
public SyncCenterPresenter(DataManagerCenter dataManagerCenter) {
Log.v("messsage","const me");
mDataManagerCenter = dataManagerCenter;
mSubscriptions = new CompositeSubscription();
centerPayloads = new ArrayList<>();
}
public void loadDatabaseCenterPayload() {
Log.v("messsage","load me");
mSubscriptions.add(mDataManagerCenter.getAllDatabaseCenterPayload()
.observeOn(AndroidSchedulers.mainThread())
.subscribeOn(Schedulers.io())
.subscribe(new Subscriber<List<CenterPayload>>() {
#Override
public void onCompleted() {
}
#Override
public void onError(Throwable e) {
}
#Override
public void onNext(List<CenterPayload> centerPayloads) {
showCenters(centerPayloads);
}
}));
}
public void syncCenterPayload(CenterPayload centerPayload) {
mSubscriptions.add(mDataManagerCenter.createCenter(centerPayload)
.observeOn(AndroidSchedulers.mainThread())
.subscribeOn(Schedulers.io())
.subscribe(new Observer<SaveResponse>() {
#Override
public void onCompleted() {
}
#Override
public void onError(Throwable e) {
}
#Override
public void onNext(SaveResponse center) {
showCenterSyncResponse();
}
}));
}
public void deleteAndUpdateCenterPayload(int id) {
mSubscriptions.add(mDataManagerCenter.deleteAndUpdateCenterPayloads(id)
.observeOn(AndroidSchedulers.mainThread())
.subscribeOn(Schedulers.io())
.subscribe(new Observer<List<CenterPayload>>() {
#Override
public void onCompleted() {
}
#Override
public void onError(Throwable e) {
}
#Override
public void onNext(List<CenterPayload> centerPayloads) {
showPayloadDeletedAndUpdatePayloads(centerPayloads);
}
}));
}
public void showCenters(List<CenterPayload> centerPayload) {
centerPayloads = centerPayload;
}
public void showCenterSyncResponse() {
deleteAndUpdateCenterPayload(centerPayloads
.get(mCenterSyncIndex).getId());
}
public void showPayloadDeletedAndUpdatePayloads(List<CenterPayload> centers) {
mCenterSyncIndex = 0;
this.centerPayloads = centers;
}
public void syncPayload() {
for (int i = 0; i < centerPayloads.size(); ++i) {
if (centerPayloads.get(i).getErrorMessage() == null) {
syncCenterPayload(centerPayloads.get(i));
mCenterSyncIndex = i;
break;
} else {
Log.v("messsage","else block");
}
}
}
}
ActivityComponent
#PerActivity
#Component(dependencies = ApplicationComponent.class, modules =
ActivityModule.class)
public interface ActivityComponent {
void inject(LoginActivity loginActivity);
void inject(PassCodeActivity passCodeActivity);
//other methods
void inject(SyncAdapter syncAdapter);
}
ActivityModule
#Module
public class ActivityModule {
private Activity mActivity;
public ActivityModule(Activity activity) {
mActivity = activity;
}
#Provides
Activity provideActivity() {
return mActivity;
}
#Provides
#ActivityContext
Context providesContext() {
return mActivity;
}
}
EDIT
SyncService.java
public class SyncService extends Service {
private static final Object sSyncAdapterLock = new Object();
private static SyncAdapter sSyncAdapter = null;
#Override
public void onCreate() {
synchronized (sSyncAdapterLock) {
if (sSyncAdapter == null) {
sSyncAdapter = new SyncAdapter(getApplicationContext(), true);
}
}
}
#Nullable
#Override
public IBinder onBind(Intent intent) {
return sSyncAdapter.getSyncAdapterBinder();
}
}
Can someone please help me to get this working? since I can't figure out where to use the inject and how to do it without an Activity Component? A different and a better approach would be appreciated as well.
Thanks

You can implement the constructor, so please use constructor injection to initialize your adapter.
public class SyncAdapter extends AbstractThreadedSyncAdapter {
// ...
#Inject
public SyncAdapter(Context context, boolean autoInitialize) { /*...*/ }
}
Then you simply inject the service that returns the SyncAdapter like you would anything else...
public class SyncService extends Service {
#Inject SyncAdapter syncAdapter;
#Override
public void onCreate() {
AndroidInjection.inject(this);
// or
DaggerSyncServiceComponent.create().inject(this);
}
#Override
public IBinder onBind(Intent intent) {
return syncAdapter;
}
}
And that's it.

Android System.Err for setVisibility(View.GONE)?

I've noticed a bug in a basic survey app I'm making to better learn android.
Occasionally I get a W/System.err﹕ at MainActivity.surveyAvailable(MainActivity.java:40) that points to this line of code:
button.setVisibility(View.GONE);
I've used setVisibility many times before and never had any issues.
Here's the function, this gets called when the user first enters the app, and after they finish taking a survey to check the server and see if there is another survey available for the user:
public void surveyAvailable(boolean surveyIsAvailable) {
Log.d("MainActivity", "App survey is available? " + surveyIsAvailable );
Button button = (Button)findViewById(R.id.takeSurveyButton);
if (surveyIsAvailable) {
button.setVisibility(View.VISIBLE);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
App.getInstance().showSurvey();
}
});
} else {
Log.d("MainActivity", "We hit here");
button.setVisibility(View.GONE);
}
}
When a survey isn't available, the appropriate lines are logged - App survey is available? false and 'We hit here'. But then the button sometimes doesn't get set to View.GONE and I see the System.Err line. But sometimes it works fine and the button's visibility does change. Any idea how to fix that? Or how to get more information on what the System.Err actually means?
EDIT:
I found that by setting Button surveyButton; in my activity and then referencing the button as this.surveyButton seems to get the functionality to work more along the lines of what we'd expect (e.g. when we call button.setVisibility(View.GONE) the view is actually consistently GONE). But it still throws the System.Err line which has me hesitant that things are working correctly.
Edited Activity:
public class MainActivity extends ActionBarActivity implements SurveyListener {
Button surveyButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.surveyButton = (Button)findViewById(R.id.takeSurveyButton);
}
public void surveyAvailable(boolean surveyIsAvailable) {
Log.d("MainActivity", "App survey is available? " + surveyIsAvailable );
if (surveyIsAvailable) {
this.surveyButton.setVisibility(View.VISIBLE);
this.surveyButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
App.getInstance().showSurvey();
}
});
} else {
Log.d("MainActivity", "We hit here");
this.surveyButton.setVisibility(View.GONE);
}
}
}
The activity implements this class:
public abstract interface SurveyListener
{
public abstract void surveyAvailable(boolean surveyAvailable);
}
Main App class that checks for surveys and calls 'surveyAvailable()`:
public class App
{
private static App _instance;
private SurveyListener _eventsHandler;
private String _apiKey = "";
private String _appuserId = "";
private String _surveyUrl = "";
private Activity _parentContext;
private Boolean _surveyAvailable;
public static App initWithApiKeyAndListener(String apiKey, SurveyListener surveyEventsHandler) {
if (_instance == null)
{
_instance = new App();
_instance._parentContext = (Activity) surveyEventsHandler;
_instance.setSurveyListener(surveyEventsHandler);
_instance.setApiKey(apiKey);
String appuserId = PreferenceManager.getDefaultSharedPreferences((Activity) _instance._eventsHandler).getString(tag, "no_appuser");
if (appuserId == "no_appuser") {
_instance._surveyAvailable = true;
_instance.alertAvailability(true);
} else {
_instance.checkForCampaigns();
}
}
return _instance;
}
private void alertAvailability(boolean surveyAvailable) {
App.getInstance()._eventsHandler.surveyAvailable(surveyAvailable);
}
private void checkForCampaigns() {
new CampaignCheck().execute();
}
public static App getInstance()
{
if (_instance == null)
{
_instance = new App();
}
return _instance;
}
public void donePushed()
{
App.getInstance().checkForCampaigns();
}
private class CampaignCheck extends AsyncTask<Void, Void, Void> {
protected Void doInBackground(Void... params) {
Boolean surveysAvailable = false;
try {
surveysAvailable = new AppuserConnection().checkCampaigns();
App.getInstance()._surveyAvailable = surveysAvailable;
App.getInstance().alertAvailability(_surveyAvailable);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
}
}
}

You shouldn't modify the UI elements from a different thread. You are doing this by calling App.getInstance().alertAvailability(_surveyAvailable); on a background thread. Move this to the AsyncTask's onPostExecute.