How to intercept touch events from ViewPager.OnPageChangeListener

问题

I'm trying to disallow my ViewPager from scrolling between tabs. I have the following situation:

        public class MyClass extends ViewPager implements ViewPager.OnPageChangeListener, OnTouchListener {

             public MyClass() {
               setOnTouchListener(this);
             }

@Override
    public void onPageScrollStateChanged(int state) {
        Log.d("Testing", TAG + " onPageScrollStateChanged");
    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        Log.d("Testing", TAG + " onPageScrolled");
    }

    @Override
    public void onPageSelected(int position) {
        Log.d("Testing", TAG + " onPageSelected");
    }

        @Override
        public boolean onInterceptTouchEvent(MotionEvent event) {
            Log.d("Testing", "intercept");
                return false;
        }

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                Log.d("Testing", "touch2");
                    return false;
            }

        }

I have the logs from onPageScrolled and onPageScrollStateChanged normally, but I do not have logs from onInterceptTouchEvent and onTouch. What am I doing wrong?

回答1:

This is how I handle this (my entire class) :

public class SelectiveViewPager extends ViewPager {
private boolean paging = true;

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

public SelectiveViewPager(Context context, AttributeSet attributeSet){
    super(context, attributeSet);
}

@Override
public boolean onInterceptTouchEvent(MotionEvent e) {
    if (paging) {
        return super.onInterceptTouchEvent(e);
    }

    return false;
}

public void setPaging(boolean p){ paging = p; }

}

The boolean paging gives you the option to turn this on and off, if you need it. If you don't need, just return false. If you aren't doing anything special in onTouch, you don't need to override it.

回答2:

return true; in your onInterceptTouchEvent();

回答3:

Your constructor doesn't get called btw. Are you creating the view pager by code or inflating it by xml? You need to define the proper constructors.

来源：https://stackoverflow.com/questions/14764603/how-to-intercept-touch-events-from-viewpager-onpagechangelistener