Bdtjtk

I wrote a custom ViewPager to disable Swipe Scroll, but I want to swipe programmatically. I have three Tab in my view pager, but when I call viewPager.setCurrentItem(viewPager.getCurrentItem()+1) on the first Fragment, it moves to the third Fragment instead of the second Fragment. And if I call same function in the second Fragment, it goes to the third. If I call (viewPager.getCurrentItem()-1)` in the third fragment, it works fine by moving back. Any help would be appreciated. My code is below:

NonSwipeAbleViewPager

public class NonSwipeableViewPager extends ViewPager {



private boolean swipeable;



public NonSwipeableViewPager(Context context, AttributeSet attrs) {

    super(context, attrs);

    TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MyViewPager);

    try {

        swipeable = a.getBoolean(R.styleable.MyViewPager_swipeable, true);

    } finally {

        a.recycle();

    }

}



@Override

public boolean onInterceptTouchEvent(MotionEvent event) {

    return swipeable ? super.onInterceptTouchEvent(event) : false;

}



@Override

public boolean onTouchEvent(MotionEvent event) {

    return swipeable ? super.onTouchEvent(event) : false;

}

}

Declaration in XML

<co.example.customview.NonSwipeableViewPager

    android:id="@+id/pager"

    android:layout_width="match_parent"

    android:layout_height="0dp"

    android:layout_weight="1"

    app:swipeable="false" />

Calling it

 @Override

public boolean onOptionsItemSelected(MenuItem item) {

    switch (item.getItemId()) {

        case R.id.menuNext:

            NonSwipeableViewPager pages = (NonSwipeableViewPager) getActivity().findViewById(R.id.pager);

            pages.setCurrentItem(pages.getCurrentItem()+1, true);

            break;

        default:

            return super.onOptionsItemSelected(item);

    }

    return super.onOptionsItemSelected(item);

}

In your PagerActivity use

    viewPager = (ViewPager) findViewById(R.id.view_pager);

    viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

        @Override

        public void onPageSelected(int position) {

            int pagei = position + 1;

            pages=pagei + "";



            Toast.makeText(PagerActivity.this, getString(R.string.changeinfopage) + " " + pages, Toast.LENGTH_SHORT).show();

        }



        @Override

        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }



        @Override

        public void onPageScrollStateChanged(int state) {

        }

    });

and

    @Override

    public boolean onOptionsItemSelected(MenuItem item) {





        switch (item.getItemId()) {



            case R.id.action_previous:



                viewPager.setCurrentItem(viewPager.getCurrentItem() - 1);

                return true;



            case R.id.action_next:



                viewPager.setCurrentItem(viewPager.getCurrentItem() + 1);

                return true;

        }



        return super.onOptionsItemSelected(item);



   }

viewPager.setCurrentItem(idx);

where idx is 0 based integer.

try this :

  viewPager.postDelayed(new Runnable() {



    @Override

    public void run() {

        viewPager.setCurrentItem(position);

    }

}, 10);

sometimes, setCurrentItem on viewpager doesn't work. As pager's content was controlled by a spinner. both the spinners and the pagers state were restored onResume, and because of this the spinners onItemSelected listener was called during the next event propagation cycle.

By using handler we can make this work because it set the pagers current position after the onItemSelected event fired.