Detect swipe using onTouchListener in ScrollView

Question

I\'m using the following code to detect swipe in my Activity:

getWindow().getDecorView().getRootView().setOnTouchListener(new OnTouchListener() {
                    


        

Answer 1

mSlop = ViewConfiguration.get(getActivity()).getScaledTouchSlop();
boolean mIsSwiping = false;

public boolean onTouch(View v, MotionEvent event) {
    //Timber.d("onTouch, v.getId %d, event.getActionMasked %d", v.getId(), event.getActionMasked());
    switch (event.getActionMasked()) {
        case MotionEvent.ACTION_DOWN:
            mDownX = event.getX();
            mDownY = event.getY();
            break;
        case MotionEvent.ACTION_UP:
        case MotionEvent.ACTION_CANCEL:
            mIsSwiping = false;
            break;
        case MotionEvent.ACTION_MOVE:
            float deltaX = event.getX() - mDownX;
            float deltaY = event.getY() - mDownY;
            if (!mIsSwiping && Math.abs(deltaX) > mSlop && Math.abs(deltaY) < mSlop) {
                mIsSwiping = true;
                if (deltaX > 0) {
                    Timber.d("swipe from left to right, slop %d", mSlop);
                    // TODO:
                } else {
                    Timber.d("swipe from right to left");
                    // TODO:
                }
                return true;
            } else if (!mIsSwiping && Math.abs(deltaY) > mSlop) {
                mIsSwiping = true;
                Timber.d("swipe vertical");
                return true;
            }

    }
    return false;
}

Answer 2

You must set OntouchListener to ScrollView.

ScrollView scrollView = (ScrollView)findViewById(R.id.scrollView1);
scrollView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch(event.getAction()){
                    case MotionEvent.ACTION_DOWN:{
                        downX = event.getX();}
                    case MotionEvent.ACTION_UP:{
                        upX = event.getX();

                        float deltaX = downX - upX;

                        if(Math.abs(deltaX)>0){
                            if(deltaX>=0){
                                swipeToRight();
                                return true;
                            }else{
                                swipeToLeft();
                                return  true;
                            }
                        }
                    }
                }

                return false;
            }
});

Answer 3

I think this is what you are looking for:

Swipe event in android ScrollView