Last Updated: June 14, 2015

SeekBar Swipe Control

Description:

In this post I'm gonna show you How you can control your seekbar( horizontal + vertical ) using the android GestureDetector.In this technique you can move your seekbar progress on screen's swipe up,down,left right movement using simple callbacks.






So let's get stared :



Step1: Add a Gesture Detector to calculate the screen's swipe(left,right,top,down).

private final class GestureListener extends GestureDetector.SimpleOnGestureListener {

        private static final int SWIPE_THRESHOLD = 10;
        private static final int SWIPE_VELOCITY_THRESHOLD = 10;

        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
            boolean result = float diffY = e2.getY() - e1.getY();
                float diffX = e2.getX() - e1.getX();
                if (Math.abs(diffX) > Math.abs(diffY)) {
                    if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(distanceX) > SWIPE_VELOCITY_THRESHOLD) {
                        if (diffX > 0) {
                            iSwipeRefresh.rightSwipe();
                            return true;
                        } else {
                            iSwipeRefresh.leftSwipe();
                            return true;

                        }
                    }
                } else {
                    if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(distanceY) > SWIPE_VELOCITY_THRESHOLD) {
                        if (diffY > 0) {

                            iSwipeRefresh.downSwipe();
                            return true;
                        } else {
                            iSwipeRefresh.upSwipe();
                            return true;
                        }
                    }
                }
            } catch (Exception exception) {
                exception.printStackTrace();
            }
            return result;
        }


        @Override
        public boolean onDown(MotionEvent e) {
            return true;
        }

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            return true;
        }
    }
Step 2: Create a interface to receive the callback.

public interface ISwipeRefresh {

    void leftSwipe();

    void rightSwipe();

    void upSwipe();

    void downSwipe();
}
Step 3: Add the above Gesture detector in a class implementing onTouchListener.

public class OnScrollTouchListenerControl implements View.OnTouchListener {

    private static final String TAG = OnScrollTouchListenerControl.class.getName();
    private final GestureDetector gestureDetector;
    private ISwipeRefresh iSwipeRefresh;

    public OnScrollTouchListenerControl(Context ctx, ISwipeRefresh iSwipeRefresh) {
        this.iSwipeRefresh = iSwipeRefresh;
        gestureDetector = new GestureDetector(ctx, new GestureListener());
    }

    public boolean onTouch(final View view, final MotionEvent motionEvent) {
        return gestureDetector.onTouchEvent(motionEvent);
    }
 }

Step:4 Finally lets integrate with this Seekbar.


public class MainActivity extends Activity implements ISwipeRefresh ,SeekBar.OnSeekBarChangeListener {

    private final static String TAG = MainActivity.class.getName();
    private SeekBar horizontalSeekB;
    private int MIN_PROGRESS = 10;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        init();
    }

    private void init() {

        findViewById(R.id.mainContainer).setOnTouchListener(new OnScrollTouchListenerControl(this, this));
        horizontalSeekB     = (SeekBar)findViewById(R.id.horizontalSeekBar);
        horizontalSeekB.setMax(100);
        horizontalSeekB.setOnSeekBarChangeListener(this);
    }

    @Override
    public void leftSwipe() {
        horizontalSeekB.setProgress(horizontalSeekB.getProgress() - MIN_PROGRESS);
    }

    @Override
    public void rightSwipe() {
        horizontalSeekB.setProgress(horizontalSeekB.getProgress() + MIN_PROGRESS);
    }

    @Override
    public void upSwipe() {
        //verticalSeekbarB.setProgress(verticalSeekbarB.getProgress() - MIN_PROGRESS);
    }

    @Override
    public void downSwipe() {
        //verticalSeekbarB.setProgress(verticalSeekbarB.getProgress() + MIN_PROGRESS);
    }

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {}

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {}

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {}
}


GITHUB Project HERE

Bingo we're DONE!!!


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