Synchronizing two ViewPagers using OnPageChangeListener

Question

I\'m trying to synchronize two ViewPagers, as apparently have quite a lot of people before me, and I\'ve got as far as this:

private ViewPager m         


        

Answer 1

I have Solved the problem without utilizing the Listener. So you can use the listener for some other stuff and will make code look cleaner.

I know its a question asked a long ago. I was searching for a solution and solved it myself.

This is how my Custom ViewPager code is

public class CustomPager extends ViewPager {
CustomPager mCustomPager;
private boolean forSuper;

public CustomPager(Context context) {
    super(context);
}

public CustomPager(Context context, AttributeSet attrs) {
    super(context, attrs);
}

@Override
public boolean onInterceptTouchEvent(MotionEvent arg0) {
    if (!forSuper) {

        mCustomPager.forSuper(true);
        mCustomPager.onInterceptTouchEvent(arg0);
        mCustomPager.forSuper(false);
    }
    return super.onInterceptTouchEvent(arg0);
}

@Override
public boolean onTouchEvent(MotionEvent arg0) {
    if (!forSuper) {
        mCustomPager.forSuper(true);
        mCustomPager.onTouchEvent(arg0);
        mCustomPager.forSuper(false);
    }
    return super.onTouchEvent(arg0);
}

public void setViewPager(CustomPager customPager) {
    mCustomPager = customPager;
}

public void forSuper(boolean forSuper) {
    this.forSuper = forSuper;
}

@Override
public void setCurrentItem(int item, boolean smoothScroll) {
    if (!forSuper) {
        mCustomPager.forSuper(true);
        mCustomPager.setCurrentItem(item, smoothScroll);
        mCustomPager.forSuper(false);
    }
    super.setCurrentItem(item, smoothScroll);
}

@Override
public void setCurrentItem(int item) {
    if (!forSuper) {
        mCustomPager.forSuper(true);
        mCustomPager.setCurrentItem(item);
        mCustomPager.forSuper(false);
    }
    super.setCurrentItem(item);

}

}

And you have to set pagers like this before adapter is set and just after getting reference using the ID.

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    backPager=(CustomPager) findViewById(R.id.BackPager);
    frontPager = (CustomPager) findViewById(R.id.frontPager);
    frontPager.setViewPager(backPager);
    backPager.setViewPager(frontPager);
    backPager.setAdapter(your Adapter);
    frontPager.setAdapter(your Adapter);
}

Must set ViewPagers before assigning adapter.