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GitHub - CCY0122/FocusLayoutManager: 有焦点item的水平/垂直滚动RecyclerView-Layou...
source link: https://github.com/CCY0122/FocusLayoutManager
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README.md
FocusLayoutManager
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
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