viewPager的OnPageChangeListener監聽器的方法調用順序

mviewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
          Log.d("測試代碼", "onPageScrolled滑動中" + position);
         }

    @Override
    public void onPageSelected(int position) {
        Log.d("測試代碼", "onPageSelected選中了" + position);
      
    }


    @Override
    public void onPageScrollStateChanged(int state) {

        if (state == ViewPager.SCROLL_STATE_DRAGGING) {
            //正在滑動   pager處於正在拖拽中

            Log.d("測試代碼", "onPageScrollStateChanged=======正在滑動" + "SCROLL_STATE_DRAGGING");

        } else if (state == ViewPager.SCROLL_STATE_SETTLING) {
            //pager正在自動沉降，至關於鬆手後，pager恢復到一個完整pager的過程
            Log.d("測試代碼", "onPageScrollStateChanged=======自動沉降" + "SCROLL_STATE_SETTLING");

        } else if (state == ViewPager.SCROLL_STATE_IDLE) {
            //空閒狀態  pager處於空閒狀態
            Log.d("測試代碼", "onPageScrollStateChanged=======空閒狀態" + "SCROLL_STATE_IDLE");
        }


    }
});

Log日誌打印以下

09-14 16:02:18.577  13543-13543/com.football.app D/測試代碼﹕ onPageScrollStateChanged=======正在滑動SCROLL_STATE_DRAGGING
09-14 16:02:18.577  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.591  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.607  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.615  13543-13543/com.football.app D/測試代碼﹕ onPageScrollStateChanged=======自動沉降SCROLL_STATE_SETTLING
09-14 16:02:18.615  13543-13543/com.football.app D/測試代碼﹕ onPageSelected1
09-14 16:02:18.624  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.641  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.658  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.675  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.691  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.709  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.726  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.743  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.760  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.777  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.794  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.811  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.828  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中0
09-14 16:02:18.845  13543-13543/com.football.app D/測試代碼﹕ onPageScrolled滑動中1
09-14 16:02:18.946  13543-13543/com.football.app D/測試代碼﹕ onPageScrollStateChanged=======空閒狀態SCROLL_STATE_IDLE

 

 

 

經過日誌 得出來  ViewPager滑動的時候  回調的方法順序爲  

1. onPageScrollStateChanged()// state == ViewPager.SCROLL_STATE_DRAGGING  正在滑動狀態

2. onPageScrolled()  //滑動狀態

3. onPageScrollStateChanged() // state ==SCROLL_STATE_SETTLING  自動沉降狀態

4. onPageSelected() // 選中狀態

5. onPageScrolled()  //滑動狀態

6. onPageScrollStateChanged()  //state==SCROLL_STATE_IDLE   空閒狀態  滑動結束