SupportV7包中 SwipeRefreshLayout 修改下拉控件的距离

  //修改下拉距离

         ViewTreeObserver vto = mCategoryResults.mSwipeRefreshLayout.getViewTreeObserver();

         vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

             public void onGlobalLayout() {

                 final DisplayMetrics metrics = getResources().getDisplayMetrics();

                 Float mDistanceToTriggerSync = Math.min(((View) mCategoryResults.mSwipeRefreshLayout.getParent()).getHeight() * 0.6f, 500 * metrics.density);

                 try {

                     Field field = SwipeRefreshLayout.class.getDeclaredField("mDistanceToTriggerSync");

                     field.setAccessible(true);

                     field.setFloat(mCategoryResults.mSwipeRefreshLayout, mDistanceToTriggerSync);

                 } catch (Exception e) {

                     e.printStackTrace();

                 }

                 ViewTreeObserver obs = mCategoryResults.mSwipeRefreshLayout.getViewTreeObserver();

                 obs.removeOnGlobalLayoutListener(this);

             }

         });