FocusLayoutManager

Introduction: 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
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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:
gif1 gif2


可自己监听滚动编写效果,如修改成仿 MacOS 文件浏览:

依赖

implementation 'com.ccy:FocusLayoutManager:1.0.2'
// (or api)

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(受动画控制),所以实际视觉上堆叠 view 的间距、普通 view 的间距未必等于 layerPadding、normalViewGap

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

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