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• Compressing Image using AsyncTask before uploading to Firebase Storage

  I'm trying to compress a images before uploading them to Firebase Storage using this class that extends AsyncTask

  ` public class BackgroundImageResize extends AsyncTask{

      Bitmap mBitmap;
  
      public BackgroundImageResize(Bitmap bitmap) {
          if(bitmap != null){
              this.mBitmap = bitmap;
          }
      }
  
      @Override
      protected void onPreExecute() {
          super.onPreExecute();
          Toast.makeText(NextActivity.this, "compressing image", Toast.LENGTH_SHORT).show();
         // showProgressBar();
      }
  
      @Override
      protected byte[] doInBackground(Uri... params) {
          Log.d(TAG, "doInBackground: started.");
  
          if(mBitmap == null){
              try{
                  mBitmap = MediaStore.Images.Media.getBitmap(NextActivity.this.getContentResolver(), params[0]);
              }catch (IOException e){
                  Log.e(TAG, "doInBackground: IOException: " + e.getMessage());
              }
          }
          byte[] bytes = null;
          bytes = getBytesFromBitmap(mBitmap, 100);
          return bytes;
      }
  
      @Override
      protected void onPostExecute(byte[] bytes) {
          super.onPostExecute(bytes);
          mUploadBytes = bytes;
       //   hideProgressBar();
          //execute the upload task
  
      }
  }
  
  public static byte[] getBytesFromBitmap(Bitmap bitmap, int quality){
      ByteArrayOutputStream stream = new ByteArrayOutputStream();
      bitmap.compress(Bitmap.CompressFormat.JPEG, quality,stream);
      return stream.toByteArray();
  }
  

  `

  using this onClickView to call it

  ` public void onClick(View v) { Log.d(TAG, "onClick: navigating to the final share screen.");

              //Compress the image
  
             try{ backgroundImageResize.execute() ; } catch (NullPointerException e) {}
  
  
              //upload the image to firebase
              Toast.makeText(NextActivity.this, "Attempting to upload new photo", Toast.LENGTH_SHORT).show();
              String caption = mCaption.getText().toString();
  
              if(intent.hasExtra(getString(R.string.selected_image))){
                  imgUrl = intent.getStringExtra(getString(R.string.selected_image));
                  mFirebaseMethods.uploadNewPhoto(getString(R.string.new_photo), caption, imageCount, imgUrl,null);
              }
              else if(intent.hasExtra(getString(R.string.selected_bitmap))){
                  bitmap = (Bitmap) intent.getParcelableExtra(getString(R.string.selected_bitmap));
                  mFirebaseMethods.uploadNewPhoto(getString(R.string.new_photo), caption, imageCount, null,bitmap);
              }
  

  `

  My question is, how do I pass the bitmap or url to this BackgroundImageResize at onCLickListener ?

  this is the firebase storage upload method

   public void uploadNewPhoto(String photoType, final String caption,final int count, final String imgUrl,
                             Bitmap bm){
      Log.d(TAG, "uploadNewPhoto: attempting to uplaod new photo.");
  
      FilePaths filePaths = new FilePaths();
      //case1) new photo
      if(photoType.equals(mContext.getString(R.string.new_photo))){
          Log.d(TAG, "uploadNewPhoto: uploading NEW photo.");
  
          String user_id = FirebaseAuth.getInstance().getCurrentUser().getUid();
          StorageReference storageReference = mStorageReference
                  .child(filePaths.FIREBASE_IMAGE_STORAGE + "/" + user_id + "/photo" + (count + 1));
  
          //convert image url to bitmap
          if(bm == null){
              bm = ImageManager.getBitmap(imgUrl);
          }
  
          byte[] bytes = ImageManager.getBytesFromBitmap(bm, 90);
  
  
          UploadTask uploadTask = null;
          uploadTask = storageReference.putBytes(bytes);
  
          uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
              @Override
              public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                  Uri firebaseUrl = taskSnapshot.getDownloadUrl();
  
                  Toast.makeText(mContext, "photo upload success", Toast.LENGTH_SHORT).show();
  
                  //add the new photo to 'photos' node and 'user_photos' node
                  addPhotoToDatabase(caption, firebaseUrl.toString());
  
                  //navigate to the main feed so the user can see their photo
                  Intent intent = new Intent(mContext, HomeActivity.class);
                  mContext.startActivity(intent);
              }
          }).addOnFailureListener(new OnFailureListener() {
              @Override
              public void onFailure(@NonNull Exception e) {
                  Log.d(TAG, "onFailure: Photo upload failed.");
                  Toast.makeText(mContext, "Photo upload failed ", Toast.LENGTH_SHORT).show();
              }
          }).addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() {
              @Override
              public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
                  double progress = (100 * taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount();
  
                  if(progress - 15 > mPhotoUploadProgress){
                      Toast.makeText(mContext, "photo upload progress: " + String.format("%.0f", progress) + "%", Toast.LENGTH_SHORT).show();
                      mPhotoUploadProgress = progress;
                  }
  
                  Log.d(TAG, "onProgress: upload progress: " + progress + "% done");
              }
          });
  
• Calling a Progressive Web App from another android application

  i have a question I've got a PWA and i want to open it from another application using the url like mypwascheme:http://my.test.host/mypage

  But i have no idea what should i use for the scheme part, ie. mypwascheme

  I tried my app's name & short name from the manifest.json but neither did work

  Any ideas? Thanks in advance
• rxjava throws OnErrorNotImplementedException

  Observable.create(new ObservableOnSubscribe())
      .subscribeOn(Schedulers.io())
      .compose(new ParserTransformer())
      .map()
      .subscribe()
  

  When something wrong in my ObservableOnSubscribe, it throws an exception(java.net.UnknownHostException ...).

  ObservableOnSubscribe:

  public void subscribe(ObservableEmitter oe) throws Exception {
      try{
          ...
      } catch {
          if (!oe.isDisposed()) {
              if (ex instanceof IOException) {
                  throw new NetException(...); //sometimes, it make the app crash!
              }
          } else{
              ...
          }
      }
      oe.onComplete();
  }
  

  here's the log :

  D OkHttp: error: java.net.UnknownHostException
  D OkHttp: oe.isDisposed: false
  W System.err: io.reactivex.exceptions.OnErrorNotImplementedException: Unable to resolve host ******: No address associated with hostname
  W System.err:   at io.reactivex.internal.functions.Functions$OnErrorMissingConsumer.accept(Functions.java:704)
  W System.err:   at io.reactivex.internal.functions.Functions$OnErrorMissingConsumer.accept(Functions.java:701)
  W System.err:   at io.reactivex.internal.observers.LambdaObserver.onError(LambdaObserver.java:77)
  W System.err:   at io.reactivex.internal.observers.BasicFuseableObserver.onError(BasicFuseableObserver.java:100)
  W System.err:   at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.checkTerminated(ObservableObserveOn.java:276)
  W System.err:   at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.drainNormal(ObservableObserveOn.java:172)
  W System.err:   at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.run(ObservableObserveOn.java:252)
  W System.err:   at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(HandlerScheduler.java:109)
  W System.err:   at android.os.Handler.handleCallback(Handler.java:754)
  W System.err:   at android.os.Handler.dispatchMessage(Handler.java:95)
  W System.err:   at android.os.Looper.loop(Looper.java:163)
  W System.err:   at android.app.ActivityThread.main(ActivityThread.java:6343)
  W System.err:   at java.lang.reflect.Method.invoke(Native Method)
  W System.err:   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:880)
  W System.err:   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:770)
  

  Why this happen? Why rxjava says that OnError is not implemented?