FocusLayoutManager-有焦点item的水平/垂直滚动RecyclerView-LayoutManager。仿An...

有焦点item的水平/垂直滚动RecyclerView-LayoutManager。仿Android豆瓣书影音“推荐“频道列表布局效果截图: GIF:  可自己监听滚动编写效果，如修改成仿MacOS文件浏览: 依赖api 'com.ccy:FocusLayoutManager:1.0.1' // （or implementation）使用focusLayoutManager =                 new FocusLayoutManager.Builder()                         .layerPadding(dp2px(this, 14))                         .normalViewGap(dp2px(this, 14))                         .focusOrientation(FocusLayoutManager.FOCUS_LEFT)                         .isAutoSelect(true)                         .maxLayerCount(3)                         .setOnFocusChangeListener(new FocusLayoutManager.OnFocusChangeListener() {                             @Override                             public void onFocusChanged(int focusdPosition, int lastFocusdPosition) {                                                              }                         })                         .build(); recyclerView.setLayoutManager(focusLayoutManager);各属性意义见图： 注意：因为item在不同区域随着滑动会有不同的缩放，所以实际layerPadding、normalViewGap会被缩放计算。调整动画效果：new FocusLayoutManager.Builder()                         ......                         .setSimpleTrasitionListener(new FocusLayoutManager.SimpleTrasitionListener() {                              @Override                             public float getLayerViewMaxAlpha(int maxLayerCount) {                                 return super.getLayerViewMaxAlpha(maxLayerCount);                             }                             @Override                             public float getLayerViewMinAlpha(int maxLayerCount) {                                 return super.getLayerViewMinAlpha(maxLayerCount);                             }                             @Override                             public float getLayerChangeRangePercent() {                                 return super.getLayerChangeRangePercent();                             }                             //and more                                                          //更多可重写方法和释义见接口声明                         })                         .build();自定义动画/滚动监听：如果你想在滑动时不仅仅改变item的大小、透明度，你有更多的想法，可以监听TrasitionListener,该监听暴露了很多关键布局数据，......             .setSimpleTrasitionListener(null) //如果默认动画不想要，移除之。or use removeTrasitionlistener(XXX)              .addTrasitionListener(new FocusLayoutManager.TrasitionListener() {                             @Override                             public void handleLayerView(FocusLayoutManager focusLayoutManager,                                                         View view, int viewLayer,                                                         int maxLayerCount, int position,                                                         float fraction, float offset) {                                                              }                             @Override                             public void handleFocusingView(FocusLayoutManager focusLayoutManager,                                                            View view, int position,                                                            float fraction, float offset) {                             }                             @Override                             public void handleNormalView(FocusLayoutManager focusLayoutManager, View view, int position, float fraction, float offset) {                             }                         })各参数意义见接口注释。 实际上SimpleTrasitionListener内部就会被转为TrasitionListener。可参考转换类是怎么做的：TrasitionListenerConvert源码解析https://blog.csdn.net/ccy0122/article/details/90515386