How can I make an Android seek-bar move smoothly?

Question

I\'m trying to make a SeekBar move more smoothly than just jumping straight to the position. I\'m doing this as I\'ve got a SeekBar with 3 options for a slider-type implementati

Answer 1

I found the following solution to make the seekbar move smoothly, yet still snap to a limited range of values. Assuming you have the following views in your layout:

You can use the following code in your activity (change the value of android:max in the above xml, and the smoothness factor in the code below according to your needs - higher values = smoother):

public class MyActivity extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    sliderListener sldListener = new sliderListener();
    SeekBar sldProgress = (SeekBar) findViewById(R.id.sldProgress);
    sldProgress.setOnSeekBarChangeListener(sldListener);
  }
  private class sliderListener implements OnSeekBarChangeListener {
    private int smoothnessFactor = 10;
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
      progress = Math.round(progress / smoothnessFactor);
      TextView lblProgress = (TextView) findViewById(R.id.lblProgress);
      lblProgress.setText(String.valueOf(progress));
    }

    public void onStartTrackingTouch(SeekBar seekBar) {
    }

    public void onStopTrackingTouch(SeekBar seekBar) {
      seekBar.setProgress(Math.round((seekBar.getProgress() + (smoothnessFactor / 2)) / smoothnessFactor) * smoothnessFactor);
    }
  }
}