Almond Mendoza

For list of android tutorial click here

You want to implement Gesture on your Android, gladly android has a build in Simple GestureDetector for you. Here is how you use it

private GestureDetector mGestureDetector;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mGestureDetector = new GestureDetector(this, new LearnGestureListener());
}
@Override
public boolean onTouchEvent(MotionEvent event) {
    if (mGestureDetector.onTouchEvent(event))
        return true;
    else
        return false;
}
class LearnGestureListener extends GestureDetector.SimpleOnGestureListener{
    @Override
    public boolean onSingleTapUp(MotionEvent ev) {
        Log.d("onSingleTapUp",ev.toString());
        return true;
    }
    @Override
    public void onShowPress(MotionEvent ev) {
        Log.d("onShowPress",ev.toString());
    }
    @Override
    public void onLongPress(MotionEvent ev) {
        Log.d("onLongPress",ev.toString());
    }
    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        Log.d("onScroll",e1.toString());
        return true;
    }
    @Override
    public boolean onDown(MotionEvent ev) {
        Log.d("onDownd",ev.toString());
        return true;
    }
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        Log.d("d",e1.toString());
        Log.d("e2",e2.toString());
        return true;
    }
}

Explanation
First we create a GestureDetector instance
private GestureDetector mGestureDetector;

Then we create a GestureListener for us to listen
class LearnGestureListener extends GestureDetector.SimpleOnGestureListener{ …… }

After creating those 2, we bind our listener to our GestureDetector instance
mGestureDetector = new GestureDetector(this, new LearnGestureListener());

Lastly we need to know where the event listener will be trigger, that is where onTouchEvent comes in
public boolean onTouchEvent(MotionEvent event) {
if (mGestureDetector.onTouchEvent(event)) …..
}

** The function on our LearnGestureListener class have logical name except onFling which means on swipe.

Reference
Code Shogun
Calandar Android App

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