We Keep Coding

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) {
}

Waiting for two onChange to trigger with MediatorLiveData

I'm currently trying to learn how to use MediatorLiveData as described here:
https://developer.android.com/reference/androidx/lifecycle/MediatorLiveData
What I want to do is wait for two livedata object to get an update then do some logic on both.
So in my activity i currently got this. While this works I'm currently only getting Orders while i would like to wait for Orders AND Orderrows to finish and then make some change.
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Button myButt;
private MainViewModel mvw;
private TextView myView;
private MediatorLiveData data;
#Override
protected void onCreate(Bundle savedInstanceState) {
mvw = new ViewModelProvider(this).get(MainViewModel.class);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myButt = findViewById(R.id.button);
myView = findViewById(R.id.textview);
myButt.setOnClickListener(this);
data = new MediatorLiveData<>();
data.addSource(mvw.getAllOrders(), new Observer<Orders>() {
#Override
public void onChanged(Orders orders) {
data.setValue(orders);
}
});
data.addSource(mvw.getAllOrderRows(), new Observer<OrderRows>() {
#Override
public void onChanged(OrderRows orderRows) {
data.setValue(orderRows);
}
});
data.observe(this, new Observer<Orders>() { //this observers Orders but how do i get orders AND orderrows?
#Override
public void onChanged(Orders order) {
myView.setText(mvw.extractDate(order));
//Here i want to manipulate order and orderrows
Log.i("livedata" , order.getOrders().toString());
}
});
}
#Override
public void onClick(View view) {
switch(view.getId()){
case R.id.button:
Log.i("button","clicked");
mvw.updateOrderData(); // calls for new values to be fetched
mvw.updateOrderRowData();
}
}
}
in my viewmodel:
public class MainViewModel extends ViewModel {
private GetOrder getOrderRepo;
private MutableLiveData<Orders> allOrders;
private MutableLiveData<OrderRows> allOrderRows;
public MainViewModel(){
getOrderRepo = new GetOrder();
}
public MutableLiveData<Orders> getAllOrders() {
if(allOrders == null){
allOrders = new MutableLiveData<>();
allOrders = getOrderRepo.getAllOrders();
}
return allOrders;
}
public MutableLiveData<OrderRows> getAllOrderRows() {
if(allOrderRows == null){
allOrderRows = new MutableLiveData<>();
allOrderRows = getOrderRepo.getAllOrderRows();
}
return allOrderRows;
}
public void updateOrderData(){
Log.i("updating","updating data");
Orders orders = getOrderRepo.getAllOrders().getValue();
allOrders.setValue(orders);
}
public void updateOrderRowData(){
Log.i("updating","updating data");
OrderRows orderRows = getOrderRepo.getAllOrderRows().getValue();
allOrderRows.setValue(orderRows);
}
public String extractDate(Orders orders){
ArrayList<Order> listOfOrders = orders.getOrders();
Log.i("extractDate", ""+(listOfOrders.size()-1));
String date = listOfOrders.get(listOfOrders.size()-1).getOrderTime();
return date;
}
}
In the repostiory.
public class GetOrder {
private ApiService mAPIService;
MutableLiveData<Orders> allOrders;
MutableLiveData<OrderRows> allOrderRows;
public GetOrder(){
mAPIService = ApiUtils.getAPIService();
allOrders = new MutableLiveData<Orders>();
allOrderRows = new MutableLiveData<OrderRows>();
}
public MutableLiveData<Orders> getAllOrders(){
Log.i("func","starting func");
mAPIService.getOrders().subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber<Orders>() {
#Override
public void onCompleted() {
Log.i("func","onComplete");
}
#Override
public void onError(Throwable e) {
Log.i("onError",e.toString());
}
#Override
public void onNext(Orders orders) {
Log.i("Repo",orders.toString());
allOrders.setValue(orders);
}
});
return allOrders;
}
public MutableLiveData<OrderRows> getAllOrderRows(){
Log.i("func","starting func");
mAPIService.getOrderRows().subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber<OrderRows>() {
#Override
public void onCompleted() {
Log.i("func","onComplete");
}
#Override
public void onError(Throwable e) {
Log.i("onError",e.toString());
}
#Override
public void onNext(OrderRows orderRows) {
Log.i("Repo",orderRows.toString());
allOrderRows.setValue(orderRows);
}
});
return allOrderRows;
}
}

Best way to use Filter or Search in Paging Library, Android

I searched but didn't find any good solution for my situation which is:
I need to filter existing List<Article> which is generated thru the paging lib, but can't figure it out how to retrieve actual articleList from api request in FeedDataSource class at FeedActivity. I need to filter actual list before adapter.submitList(pagedList);
FeedDataSurce class
public class FeedDataSource extends PageKeyedDataSource<Long, Article>{
private static final String QUERY = "movies";
private static final String API_KEY = "079dac74a5f94ebdb990ecf61c8854b7";
private static final String TAG = FeedDataSource.class.getSimpleName();
private RestApi restApi;
private MutableLiveData networkState;
public FeedDataSource() {
restApi = RestApiFactory.feedRequest();
networkState = new MutableLiveData();
}
public MutableLiveData getNetworkState() {
return networkState;
}
#Override
public void loadInitial(#NonNull LoadInitialParams<Long> params,
#NonNull LoadInitialCallback<Long, Article> callback) {
networkState.postValue(NetworkState.LOADING);
restApi.fetchFeed(QUERY, API_KEY, 1, params.requestedLoadSize)
.enqueue(new Callback<FeedResponse>() {
#Override
public void onResponse(Call<FeedResponse> call, Response<FeedResponse> response) {
if(response.isSuccessful()) {
callback.onResult(response.body().getArticles(), null, 2l);
networkState.postValue(NetworkState.LOADED);
} else {
networkState.postValue(new NetworkState(NetworkState.Status.FAILED, response.message()));
}
}
#Override
public void onFailure(Call<FeedResponse> call, Throwable t) {
String errorMessage = t == null ? "unknown error" : t.getMessage();
networkState.postValue(new NetworkState(NetworkState.Status.FAILED, errorMessage));
}
});
}
#Override
public void loadBefore(#NonNull LoadParams<Long> params,
#NonNull LoadCallback<Long, Article> callback) {
}
#Override
public void loadAfter(#NonNull LoadParams<Long> params, #NonNull LoadCallback<Long, Article> callback) {
Log.d(TAG, "Loading Rang " + params.key + " Count " + params.requestedLoadSize);
networkState.postValue(NetworkState.LOADING);
restApi.fetchFeed(QUERY, API_KEY, params.key, params.requestedLoadSize).enqueue(new Callback<FeedResponse>() {
#Override
public void onResponse(Call<FeedResponse> call, Response<FeedResponse> response) {
if(response.isSuccessful()) {
callback.onResult(response.body().getArticles(), params.key + 1);
networkState.postValue(NetworkState.LOADED);
} else
networkState.postValue(new NetworkState(NetworkState.Status.FAILED, response.message()));
}
#Override
public void onFailure(Call<FeedResponse> call, Throwable t) {
String errorMessage = t == null ? "unknown error" : t.getMessage();
networkState.postValue(new NetworkState(NetworkState.Status.FAILED, errorMessage));
}
});
}
DataFactory class
public class FeedDataFactory extends DataSource.Factory {
private MutableLiveData<FeedDataSource> mutableLiveData;
public FeedDataFactory() {
this.mutableLiveData = new MutableLiveData<>();
}
#Override
public DataSource create() {
FeedDataSource feedDataSource = new FeedDataSource();
mutableLiveData.postValue(feedDataSource);
return feedDataSource;
}
public MutableLiveData<FeedDataSource> getMutableLiveData() {
return mutableLiveData;
}
ViewModel
public class FeedViewModel extends ViewModel {
private Executor executor;
private LiveData<NetworkState> networkState;
private LiveData<PagedList<Article>> articleLiveData;
public FeedViewModel() {
init();
}
private void init() {
executor = Executors.newFixedThreadPool(5);
FeedDataFactory feedDataFactory = new FeedDataFactory();
networkState = Transformations.switchMap(feedDataFactory.getMutableLiveData(),
dataSource -> dataSource.getNetworkState());
PagedList.Config pagedListConfig = new PagedList.Config.Builder()
.setEnablePlaceholders(true)
.setInitialLoadSizeHint(20)
.setPageSize(20)
.build();
articleLiveData = new LivePagedListBuilder(feedDataFactory, pagedListConfig)
.setFetchExecutor(executor)
.build();
}
public LiveData<NetworkState> getNetworkState() {
return networkState;
}
public LiveData<PagedList<Article>> getArticleLiveData() {
return articleLiveData;
}
Activity
public class FeedActivity extends AppCompatActivity {
private FeedListAdapter adapter;
private FeedViewModel feedViewModel;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/*
* Step 2: Initialize the ViewModel
*
* */
feedViewModel = new FeedViewModel();
/*
* Step 2: Setup the adapter class for the RecyclerView
*
* */
RecyclerView recyclerView = findViewById(R.id.list_feed);
recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
adapter = new FeedListAdapter(getApplicationContext());
/*
* Step 4: When a new page is available, we call submitList() method
* of the PagedListAdapter class
*
* */
feedViewModel.getArticleLiveData().observe(this, pagedList -> {
Log.d("TAG", "onCreate: ");
adapter.submitList(pagedList);
});
/*
* Step 5: When a new page is available, we call submitList() method
* of the PagedListAdapter class
*
* */
feedViewModel.getNetworkState().observe(this, networkState -> {
adapter.setNetworkState(networkState);
});
recyclerView.setAdapter(adapter);
}

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

RxJava: how to turn a complicated if statement into a reactive stream?

I am implementing an app introduction and waiver that should appear before the user can access the MainActivity of my Android app. If the user has not accepted the waiver or gone through the app introduction, then my IntroNavigator kicks them back to those activities.
How can I rxify my redirectIfNecessary() method in a more functional manner, instead of the imperative approach I implemented below.
IntroNavigatorImpl.java
public class IntroNavigatorImpl implements IntroNavigator {
WeakReference<Activity> activityWeakReference;
CloudPrefsRepo cloudPrefsRepo;
public IntroNavigatorImpl(Activity activity, CloudPrefsRepo cloudPrefsRepo) {
this.activityWeakReference = new WeakReference<>(activity);
this.cloudPrefsRepo = cloudPrefsRepo;
}
#Override
public void redirectIfNecessary() {
final boolean shouldShowAppIntro = cloudPrefsRepo.shouldShowAppIntro()
.toObservable().toBlocking().first();
final boolean shouldShowWaiver = cloudPrefsRepo.shouldShowWaiver()
.toObservable().toBlocking().first();
if (shouldShowAppIntro) {
showAppIntro();
finishActivity();
} else if (shouldShowWaiver) {
showWaiver();
finishActivity();
} else {
//do nothing
}
}
#Override
public void showWaiver() {
//launch waiver activity
}
#Override
public void showAppIntro() {
//launch app intro activity
}
public void finishActivity() {
if (activityWeakReference.get() != null) {
activityWeakReference.get().finish();
}
}
}
CloudPrefsRepo.java
public interface
/**
* Whether to show the app intro.
*/
Single<Boolean> shouldShowAppIntro();
/**
* Whether to show the waiver. If the user has already
* accepted this waiver, then it shouldn't be shown.
*/
Single<Boolean> shouldShowWaiver();

Edit Based on comment:
It's not the prettiest (I'm leaning towards there not being a good reactive way to do this)
final Action0 showInfoAction = new Action0() {
#Override
public void call() {
showAppIntro();
finishActivity();
}
};
final Action0 showWaiverAction = new Action0() {
#Override
public void call() {
showWaiver();
finishActivity();
}
};
final Action0 blankAction = new Action0() {
#Override
public void call() {
}
};
Observable.zip(shouldShowInfo, shouldShowWaiver, new Func2<Boolean, Boolean, Action0>() {
#Override
public Action0 call(Boolean shoudlShowInfo, Boolean shouldShowWaiver) {
if (shoudlShowInfo) {
return showInfoAction;
} else if (shouldShowWaiver) {
return showWaiverAction;
} else {
return blankAction;
}
}
}).subscribe(new Action1<Action0>() {
#Override
public void call(Action0 action0) {
action0.call();
}
});