接口回调Demo

最新推荐文章于 2023-02-09 11:45:04 发布

仨胖_sam

最新推荐文章于 2023-02-09 11:45:04 发布

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接口回调Demo

设置接口

ViewPager mViewPager.setOnPageChangeListener(listener);


OnPageChangeListener listener = new OnPageChangeListener() {

        @Override
        public void onPageScrolled(int position, float positionOffset,
                int positionOffsetPixels) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onPageSelected(int position) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onPageScrollStateChanged(int state) {
            // TODO Auto-generated method stub

        }

    };

定义接口

public interface OnPageChangeListener {

  void onPageScrolled(int position, float positionOffset, int positionOffsetPixels);


 void onPageSelected(int position);

  void onPageScrollStateChanged(int state);
}

回调接口

 private void dispatchOnScrollStateChanged(int state) {
        if (mOnPageChangeListener != null) {
            mOnPageChangeListener.onPageScrollStateChanged(state);
        }
        if (mOnPageChangeListeners != null) {
            for (int i = 0, z = mOnPageChangeListeners.size(); i < z; i++) {
                OnPageChangeListener listener = mOnPageChangeListeners.get(i);
                if (listener != null) {
                    listener.onPageScrollStateChanged(state);
                }
            }
        }
        if (mInternalPageChangeListener != null) {
            mInternalPageChangeListener.onPageScrollStateChanged(state);
        }
    }