下拉刷新

Author: CSnowStack

app/src/main/java/cq/airbnb/IsChildRequestScrollListener.java

@@ -5,5 +5,5 @@
  */
 
 public interface IsChildRequestScrollListener {
-    boolean requestScroll(boolean up,boolean inTranslationMin);
+    boolean requestScroll(boolean up,boolean shouldNotRefresh);
 }

app/src/main/java/cq/airbnb/TabBehavior.java

@@ -103,6 +103,7 @@ public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, View child, V
         }
 
         //如果list需要滑动 且 不是(向上滑&&tab不在顶部)
+
         if (isChildRequestScroll(child.getTranslationY())) {
             consumed[1] = 0;
             return;
@@ -213,12 +214,12 @@ public void onAnimationUpdate(ValueAnimator animation) {
      */
     private boolean isChildRequestScroll(float translationY) {
         PagerAdapter adapter = mViewPager.getAdapter();
-        boolean isTranslationMin=translationY==mTranslationMin;
-        return ((translationY == 0 ||((translationY==mTranslationMax||isTranslationMin)&&!mUp))&&/*在顶部,或在底部且向下滑,在初始位置的时候,不给刷新,但是可以向下滑*/
+        boolean shouldNotRefresh=translationY==mTranslationMin||translationY==0;//这两个位置的时候不应该刷新
+        return ((translationY == 0 ||((translationY==mTranslationMax||shouldNotRefresh)&&!mUp))&&/*在顶部,或在底部且向下滑,在初始位置的时候,不给刷新,但是可以向下滑*/
                 adapter != null && //有适配器
                 adapter.getCount() > 0 &&//有item
                 adapter instanceof IsChildRequestScrollListener && //实现了
-                ((IsChildRequestScrollListener) adapter).requestScroll(mUp,isTranslationMin)//需要滑动
+                ((IsChildRequestScrollListener) adapter).requestScroll(mUp,shouldNotRefresh)//需要滑动
         );
     }
 

app/src/main/java/cq/behaviordemo/ItemFragment.java

@@ -60,12 +60,12 @@ private void initView() {
 
 
     @Override
-    public boolean requestScroll(boolean up,boolean isTranslationMin) {
+    public boolean requestScroll(boolean up,boolean shouldNotRefresh) {
         //向上滑动,并且 mRecyclerView 可以上滑动
         return (up && ViewCompat.canScrollVertically(mRecyclerView, 1)) ||
-                //向下滑动,且可以下滑或者(可以刷新,且不在初始位置)
+                //向下滑动,且可以下滑或者(可以刷新,且不在初始位置,不在顶部)
                 (!up && (ViewCompat.canScrollVertically(mRecyclerView, -1) ||
-                        (!isTranslationMin&&((LinearLayoutManager) mRecyclerView.getLayoutManager()).findFirstCompletelyVisibleItemPosition() == 0)));
+                        (!shouldNotRefresh&&((LinearLayoutManager) mRecyclerView.getLayoutManager()).findFirstCompletelyVisibleItemPosition() == 0)));
 
     }
 

app/src/main/java/cq/behaviordemo/adapter/ItemAdapter.java

@@ -62,13 +62,13 @@ public CharSequence getPageTitle(int position) {
 
 
     @Override
-    public boolean requestScroll(boolean up,boolean isTranslationMin) {
+    public boolean requestScroll(boolean up,boolean shouldNotRefresh) {
         //有子项目,有设置 vp ,没被清掉
         if(mViewPager!=null&&mViewPager.get()!=null ){
             int currentItem=mViewPager.get().getCurrentItem();
             //实现了接口
             if(getItem(currentItem) instanceof IsChildRequestScrollListener)
-                return ((IsChildRequestScrollListener)getItem(currentItem)).requestScroll(up,isTranslationMin);
+                return ((IsChildRequestScrollListener)getItem(currentItem)).requestScroll(up,shouldNotRefresh);
         }
 
         return false;