一个iOS风格的边缘滚动效果：overscroll

核心效果类是安卓view的松耦合的－-decorators ，因此它和和具体的View是解耦了的。这让开发者在实现效果的同时尽可能像黑盒那样不受干扰。

Gradle 依赖

添加如下到module的build.gradle 文件:

dependencies {      // ...        compile 'me.everything:overscroll-decor-android:1.0.0'  }

RecyclerView

RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);    // Horizontal  OverScrollDecoratorHelper.setUpOverScroll(recyclerView, OverScrollDecoratorHelper.ORIENTATION_HORIZONTAL);  // Vertical  OverScrollDecoratorHelper.setUpOverScroll(recyclerView, OverScrollDecoratorHelper.ORIENTATION_VERTICAL);

ListView

ListView listView = (ListView) findViewById(R.id.list_view);  OverScrollDecoratorHelper.setUpOverScroll(listView);

GridView

GridView gridView = (GridView) findViewById(R.id.grid_view);  OverScrollDecoratorHelper.setUpOverScroll(gridView);

ScrollView, HorizontalScrollView

ScrollView scrollView = (ScrollView) findViewById(R.id.scroll_view);  OverScrollDecoratorHelper.setUpOverScroll(scrollView);    HorizontalScrollView horizontalScrollView = (HorizontalScrollView) findViewById(R.id.horizontal_scroll_view);  OverScrollDecoratorHelper.setUpOverScroll(horizontalScrollView);

任意view   (Always Over-Scroll Ready)

View view = fragmentView.findViewById(R.id.demo_view);    // Horizontal  OverScrollDecoratorHelper.setUpStaticOverScroll(view, OverScrollDecoratorHelper.ORIENTATION_HORIZONTAL);  // Vertical  OverScrollDecoratorHelper.setUpStaticOverScroll(view, OverScrollDecoratorHelper.ORIENTATION_VERTICAL);

高级用法

// Horizontal RecyclerView  RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);  new HorizontalOverScrollBounceEffectDecorator(new RecyclerViewOverScrollDecorAdapter(recyclerView));    // ListView (vertical)  ListView listView = (ListView) findViewById(R.id.list_view);  new VerticalOverScrollBounceEffectDecorator(new AbsListViewOverScrollDecorAdapter(listView));    // GridView (vertical)  GridView gridView = (GridView) findViewById(R.id.grid_view);  new VerticalOverScrollBounceEffectDecorator(new AbsListViewOverScrollDecorAdapter(gridView));    // A simple TextView - horizontal  View textView = findViewById(R.id.title);  new HorizontalOverScrollBounceEffectDecorator(new StaticOverScrollDecorAdapter(view));

自定义 View

public class CustomView extends View {      // ...  }    final CustomView view = (CustomView) findViewById(R.id.custom_view);  new VerticalOverScrollBounceEffectDecorator(new IOverScrollDecoratorAdapter() {        @Override      public View getView() {          return view;      }        @Override      public boolean isInAbsoluteStart() {          // canScrollUp() is an example of a method you must implement          return !view.canScrollUp();      }        @Override      public boolean isInAbsoluteEnd() {           // canScrollDown() is an example of a method you must implement          return !view.canScrollDown();      }  });

效果与行为配置

/// Make over-scroll applied over a list-view feel more 'stiff'  new VerticalOverScrollBounceEffectDecorator(new AbsListViewOverScrollDecorAdapter(view),          5f, // Default is 3          VerticalOverScrollBounceEffectDecorator.DEFAULT_TOUCH_DRAG_MOVE_RATIO_BCK,          VerticalOverScrollBounceEffectDecorator.DEFAULT_DECELERATE_FACTOR);    // Make over-scroll applied over a list-view bounce-back more softly  new VerticalOverScrollBounceEffectDecorator(new AbsListViewOverScrollDecorAdapter(view),          VerticalOverScrollBounceEffectDecorator.DEFAULT_TOUCH_DRAG_MOVE_RATIO_FWD,          VerticalOverScrollBounceEffectDecorator.DEFAULT_TOUCH_DRAG_MOVE_RATIO_BCK,          -1f // Default is -2          );