前言:

在ExpandableRecyclerView的基础上实现的StickyRecyclerView,支持水平与垂直方向, 支持GridLayoutManager和StaggeredGridLayoutManager布局和自定义LayoutManager扩展, 支持StickyHeader和下一个StickyHeader的渐变背景文字颜色动画,支持画的方式与Gravity和任意布局方式,Header,Footer, 支持StickyManager扩展

RecyclerViw之ExpandableRecyclerView

RecyclerViw之StickyRecyclerView

RecyclerView之WheelView

RecyclerView之BannerPager

先看功能图和效果图(查看原图动画)

StickyHeader渐变效果,查看原图动画

垂直方式,百分百还原微信效果,查看原图动画

水平方式,查看原图动画

Grid和瀑布流式,查看原图动画

任意布局样式,查看原图动画

测试demo.apk包下载

一: 使用, 没有过度的封装

allprojects {
    repositories {
    ...
    maven { url 'https://jitpack.io' }
    }  
}

dependencies {
    implementation 'com.github.youxiaochen:sticky-recyclerview:1.0.4'
}

private var stickyView: StickyRecyclerView...
private var adapter: StickAdapter...
private var indexView: CharIndexView...

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    ......
    stickyView.setStickyAdapter(adapter)
    CharIndexMediator(stickyView, indexView).attach(this) /** 交给*/
}

源码地址 https://github.com/youxiaochen/sticky-recyclerview

亦可使用代码生成控件

//用于代码生成控件
public StickyRecyclerView(@NonNull Context context, @NonNull StickyParams params) {
    this(context, params, new DrawingStickyManager());
}

//用于代码生成控件
public StickyRecyclerView(@NonNull Context context, @NonNull StickyParams params, @NonNull StickyManager stickyManager) {
    super(context);
    initialize(params, stickyManager);
}

二: 相关类

1. CharIndexView相关属性, 配合CharIndexMediator使用更方便

内部Adapter类
public static abstract class Adapter {
    ......
    
    //字符索引数量
    public abstract int getItemCount();

    //当前字符索引
    public abstract char getItemChar(int position);
}

CharIndexView属性图

2. StickyRecyclerView相关属性 extends ExpandableRecyclerView

内部StickyAdapter类, 用法与ExpandableAdapter一致
public static abstract class StickyAdapter<GVH extends GroupViewHolder, CVH extends ChildViewHolder> extends ExpandableAdapter<GVH, CVH> {

    @Override
    public boolean groupCanClick() {
        return false;
    }

    @Override
    public void onGroupViewAttachedToWindow(@NonNull GVH holder) {
        ViewGroup.LayoutParams params = holder.itemView.getLayoutParams();
        if ((params instanceof StaggeredGridLayoutManager.LayoutParams)) {
            StaggeredGridLayoutManager.LayoutParams sParams = (StaggeredGridLayoutManager.LayoutParams) params;
            sParams.setFullSpan(true);
        }
    }

    //获取Sticky的item对象
    @NonNull
    public abstract String getStickerItem(int groupPos);
}

StickyManager支持重写扩展 setStickyManager(stickyManager...)

3. 适用任意布局时的StickyLayoutView相关属性 extends FrameLayout

内部Adapter类, 用法与ExpandableAdapter一致
public static abstract class Adapter<GVH extends GroupViewHolder, CVH extends ChildViewHolder> extends ExpandableAdapter<GVH, CVH> {

    /**
     * 创建StickyViewHolder, 不与ExpandableRecyclerView中的GroupViewHolder混合复用
     * 若要监听点击事件亦可在此方法中设置
     */
    public abstract @NonNull GVH onCreateStickyViewHolder(@NonNull ViewGroup parent);

    //绑定当前StickyViewHolder
    public abstract void onBindStickyViewHolder(@NonNull GVH holder, int groupPos);

    @Override
    public boolean groupCanClick() {
        return false;
    }
}

源码地址 https://github.com/youxiaochen/sticky-recyclerview

RecyclerViw之ExpandableRecyclerView

RecyclerViw之StickyRecyclerView

RecyclerView之WheelView

RecyclerView之BannerPager

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