Android how to update value of ProgressBar?

Question

My activity have a ProgressBar. When start activity, I\'ll check value get from another place and update to ProgressBar. Here\'s my code:

final ProgressBar p         


        

Answer 1

I usually use this code:

private int mProgressStatus;
private Handler mHandler = new Handler();

public void startProgress(View view) {
    final ProgressBar progressBar = (ProgressBar) findViewById(R.id.horizontal_progress);
    mProgressStatus = 0;
    progressBar.setProgress(mProgressStatus);

    //progressBar.setVisibility(View.VISIBLE);
    new AsyncTask<Void, Void, Void>() {
        @Override
        protected Void doInBackground(final Void... params) {
            while (mProgressStatus < 100) {
                try {
                    Thread.sleep(500);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                mProgressStatus += 15;
                mHandler.post(new Runnable() {
                    public void run() {
                        progressBar.setProgress(mProgressStatus);
                    }
                });
            }
            return null;
        }

    }.execute();
}

Hope this helps

Answer 2

Try with:

    int currentPosition=0;
    int total=mediaPlayer.getDuration();
    while(mediaPlayer!=null && currentPosition<total){
        try{
            if(progressEnable){
                Thread.sleep(1000);
                currentPosition=mediaPlayer.getCurrentPosition();
                long pos=1000L * currentPosition/total;
                Log.d("thread pos", pos+"");
                progressSeekBar.setProgress((int) pos);
            }
        }
        catch (Exception e) {
        }
    }

Declare progressEnable globally:

private boolean progressEnable=true;

Answer 3

You can auto-advance progress bar using RXJava.

@Override
protected void onAttachedToWindow() {
    super.onAttachedToWindow();
    if (autoProgress) {
        autoProgressSubscriber = Observable.interval(0, 1000/60, TimeUnit.MILLISECONDS) //~60fps
                    .map(index -> calculateAutoProgress())
                    .subscribe(progress -> {
                        if (progressBar != null) {
                            progressBar.setProgress(progress);
                        }
                    });
    }
}

@Override
protected void onDetachedFromWindow() {
    if (autoProgress) {
        autoProgressSubscriber.unsubscribe();
    }
    super.onDetachedFromWindow();
}

Answer 4

You are running a while (progressBar.getProgress() < 100) in the UI thread (you use runOnUiThread) so UI thread will be blocked (and nothing painted) until this loop finish.

You can:

• Put the runOnUiThread inside the loop and, maybe, a sleep inside de runOnUiThread call. However, it is not the preferred kind of solution since you are using too much CPU to just look for a value change. The sleep approach it a bit ugly but solves the cpu problem. It would be something like::

  Thread t = new Thread() {
      public void run() {
      int oldProgress = 0;
  
      while (progressBar.getProgress() < 100) {
              ((Activity) ctx).runOnUiThread(new Runnable() {
                  public void run() {
                      int value = Downloader.progress.get(gameId+ "");
                      if (value != oldProgress) {
                          oldProgress = value;
                          progressBar.setProgress(value);
                          progressText.setText(value + " %");
                      }
                  }
              }
              Thread.sleep(500);
          }
      });
    }
  };
  

• Update the progress bar in an event way so you only call (in the UI thread) the update code when progress changes. It is the preferred way.