How do I make a seekbar whose initail progress which is zero, starts in the middle

Question

I want to customize the SeekBar as shown below in the image.

I'm a beginner in programming and I looked for tutorials, but every where the progress starts in the leftmost corner. Can someone please guide me how can I customize the SeekBar.

So In onProgresschanged.

 @Override
 public void onProgressChanged(SeekBar seekBar,int progress, boolean fromUser) {            
brightness = progress;
    putGestureImageOnScreen(doBrightness(imageBitmap, brightness));
 }

Thanks.

Answer 1

Seekbars in Android cannot have negative values. Assuming you have specified a value of '100' for your maximum range of the progress bar (for example using setMax(100) or in your xml file using android:max="100"), then you can use this method to move your progress bar to the middle whenever you want (for example in your Activity.onCreate() or wherever else)

    yourProgressBar.setProgress(50);

After that you can get the progress value using:

    int progress = yourProgressBar.getProgress();

If you want to have a progress value between (e.g.) -50 to +50, then you can simply use:

    int progress = yourProgressBar.getProgress();
    progress -= 50;

Good luck.