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本文實例為大家分享了Android仿IOS回彈效果的具體代碼，供大家參考，具體內容如下
效果圖:
導入依賴:
dependencies {
// ...
compile 'me.everything:overscroll-decor-android:1.0.4'
}
RecyclerView
支持線性布局和網格布局管理器（即所有原生Android布局）。可以輕松適應支持自定義布局管理器。
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);
ViewPager
ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager); OverScrollDecoratorHelper.setUpOverScroll(viewPager);
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);
Any View - Text, Image…
View view = findViewById(R.id.demo_view); // Horizontal OverScrollDecoratorHelper.setUpStaticOverScroll(view, OverScrollDecoratorHelper.ORIENTATION_HORIZONTAL); // Vertical OverScrollDecoratorHelper.setUpStaticOverScroll(view, OverScrollDecoratorHelper.ORIENTATION_VERTICAL);
高級用法
// 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)); // ViewPager ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager); new HorizontalOverScrollBounceEffectDecorator(new ViewPagerOverScrollDecorAdapter(viewPager)); // A simple TextView - horizontal View textView = findViewById(R.id.title); new HorizontalOverScrollBounceEffectDecorator(new StaticOverScrollDecorAdapter(view));
RecyclerView 使用 ItemTouchHelper 進行拖動
從版本1.0.1起，效果可以與RecyclerView內置的滑動機制（基于ItemTouchHelper）平滑運行。但是，還需要一些很少顯式的配置工作：
// Normally you would attach an ItemTouchHelper & a callback to a RecyclerView, this way:
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
ItemTouchHelper.Callback myCallback = new ItemTouchHelper.Callback() {
...
};
ItemTouchHelper myHelper = new ItemTouchHelper(myCallback);
myHelper.attachToRecyclerView(recyclerView);
// INSTEAD of attaching the helper yourself, simply use the dedicated adapter
new VerticalOverScrollBounceEffectDecorator(new RecyclerViewOverScrollDecorAdapter(recyclerView, myCallback));
滾動狀態改變回調
// Note: over-scroll is set-up using the helper method.
IOverScrollDecor decor = OverScrollDecoratorHelper.setUpOverScroll(recyclerView, OverScrollDecoratorHelper.ORIENTATION_HORIZONTAL);
decor.setOverScrollStateListener(new IOverScrollStateListener() {
@Override
public void onOverScrollStateChange(IOverScrollDecor decor, int oldState, int newState) {
switch (newState) {
case STATE_IDLE:
// No over-scroll is in effect.
break;
case STATE_DRAG_START_SIDE:
// Dragging started at the left-end.
break;
case STATE_DRAG_END_SIDE:
// Dragging started at the right-end.
break;
case STATE_BOUNCE_BACK:
if (oldState == STATE_DRAG_START_SIDE) {
// Dragging stopped -- view is starting to bounce back from the *left-end* onto natural position.
} else { // i.e. (oldState == STATE_DRAG_END_SIDE)
// View is starting to bounce back from the *right-end*.
}
break;
}
}
}
拖拽出View原本范圍時回調
當前拖拽的強度（偏移量）
// Note: over-scroll is set-up by explicity instantiating a decorator rather than using the helper; The two methods can be used interchangeably for registering listeners.
VerticalOverScrollBounceEffectDecorator decor = new VerticalOverScrollBounceEffectDecorator(new RecyclerViewOverScrollDecorAdapter(recyclerView, itemTouchHelperCallback));
decor.setOverScrollUpdateListener(new IOverScrollUpdateListener() {
@Override
public void onOverScrollUpdate(IOverScrollDecor decor, int state, float offset) {
final View view = decor.getView();
if (offset > 0) {
// 'view' is currently being over-scrolled from the top.
} else if (offset < 0) {
// 'view' is currently being over-scrolled from the bottom.
} else {
// No over-scroll is in-effect.
// This is synonymous with having (state == STATE_IDLE).
}
}
});
自定義控件
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();
}
});
拖拽強度和回彈效果配置
/// 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
);
禁用回彈效果和開啟回彈效果
IOverScrollDecor decor = OverScrollDecoratorHelper.setUpOverScroll(view); // Detach. You are strongly encouraged to only call this when overscroll isn't // in-effect: Either add getCurrentState()==STATE_IDLE as a precondition, // or use a state-change listener. decor.detach(); // Attach. decor.attach();
源碼地址：Android仿IOS回彈效果
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持億速云。
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