Controlling two ViewPager Together

Question

I need to synchronize the two ViewPager together. The requirement is something like on scrolling the ViewPager-1 and the ViewPager-2 should also scroll by certain amount. The Image shown below will make you more clear with my question.

You can also help me with some tutorials link. Thanks.

Answer 1

I think this is what you need:

        viewpager1.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                viewpager2.onTouchEvent(event);
                return false;
            }
        });

        viewpager2.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                viewpager1.onTouchEvent(event);
                return false;
            }
        });

I have a same problem, but first I try to use fakeDragBy method, which is dead end. (if you have more than two pages)

Answer 2

You can extend ViewPager in order to create a custom view and override onTouchEvent() in the following way:

        @Override
        public boolean onTouchEvent(MotionEvent event) {

          if(mDependentView != null){
            mDependentView.onTouchEvent(event);
          }
          return super.onTouchEvent(event);
        }

Also create a setter inside your custom class in order to set the dependentView

public void setDependentView(View view){
   mDependentView = view;
}

Then you should set the second viewpager as dependent view of the first viewpager in your activity.