简介
该控件用于在有限的窗口中展示大量数据集，其实这样功能的控件我们并不陌生，例如：ListView、GridView、瀑布流布局。
有了ListView、GridView为什么还需要RecyclerView这样的控件呢？整体上看RecyclerView架构，提供了一种插拔式的体验，高度的解耦，异常的灵活，通过设置它提供的不同LayoutManager，ItemDecoration , ItemAnimator实现酷炫的效果。
提供的几个关键方法有：
setLayoutManager：设置布局方式
setAdapter：设置Item的Adapter
setItemAnimator：设置Item的动画效果
addItemDecoration：分割线的样式
实现ListView功能
public class RecycleActivity extends AppCompatActivity { @BindView(R.id.recycle_view) RecyclerView recycleView; private List mDatas = new ArrayList<>(); @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_recycle); ButterKnife.bind(this); initData(); recycleView.setAdapter(new MyAdapter(mDatas)); recycleView.setLayoutManager(new LinearLayoutManager(this)); DividerItemDecoration dividerItemDecorationV = new DividerItemDecoration( RecycleActivity.this, DividerItemDecoration.VERTICAL); recycleView.addItemDecoration(dividerItemDecorationV); } private void initData() { for (int i = 0; i < 100; i++) { mDatas.add(String.valueOf(i)); } } private static class MyViewHolder extends RecyclerView.ViewHolder { private TextView tv; public MyViewHolder(View itemView) { super(itemView); tv = (TextView) itemView.findViewById(R.id.holder_view_tv); } } private static class MyAdapter extends RecyclerView.Adapter { private List mDatas; public MyAdapter(List datas) { mDatas = datas; } @Override public int getItemCount() { return mDatas.size(); } @Override public void onBindViewHolder(MyViewHolder holder, int position) { holder.tv.setText(mDatas.get(position)); } @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.holder_view, parent, false); MyViewHolder myViewHolder = new MyViewHolder(itemView); return myViewHolder; } }} 运行截图
实现GridView功能
public class RecycleActivity extends AppCompatActivity { @BindView(R.id.recycle_view) RecyclerView recycleView; private List mDatas = new ArrayList<>(); @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_recycle); ButterKnife.bind(this); initData(); recycleView.setAdapter(new MyAdapter(mDatas)); recycleView.setLayoutManager(new GridLayoutManager(this, 3)); DividerItemDecoration dividerItemDecorationV = new DividerItemDecoration( RecycleActivity.this, DividerItemDecoration.VERTICAL); DividerItemDecoration dividerItemDecorationH = new DividerItemDecoration( RecycleActivity.this, DividerItemDecoration.HORIZONTAL); recycleView.addItemDecoration(dividerItemDecorationV); recycleView.addItemDecoration(dividerItemDecorationH); } private void initData() { for (int i = 0; i < 100; i++) { mDatas.add(String.valueOf(i)); } } private static class MyViewHolder extends RecyclerView.ViewHolder { private TextView tv; public MyViewHolder(View itemView) { super(itemView); tv = (TextView) itemView.findViewById(R.id.holder_view_tv); } } private static class MyAdapter extends RecyclerView.Adapter { private List mDatas; public MyAdapter(List datas) { mDatas = datas; } @Override public int getItemCount() { return mDatas.size(); } @Override public void onBindViewHolder(MyViewHolder holder, int position) { holder.tv.setText(mDatas.get(position)); } @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.holder_view, parent, false); MyViewHolder myViewHolder = new MyViewHolder(itemView); return myViewHolder; } }} 运行截图
实现瀑布流
public class RecycleActivity extends AppCompatActivity { @BindView(R.id.recycle_view) RecyclerView recycleView; private List mDatas = new ArrayList<>(); private List mHeights = new ArrayList<>(); @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_recycle); ButterKnife.bind(this); initData(); recycleView.setAdapter(new MyAdapter(mDatas, mHeights)); StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL); recycleView.setLayoutManager(staggeredGridLayoutManager); } private void initData() { for (int i = 0; i < 100; i++) { mDatas.add(String.valueOf(i)); mHeights.add((int) (100 + Math.random() * 300)); } } private static class MyViewHolder extends RecyclerView.ViewHolder { private TextView tv; public MyViewHolder(View itemView) { super(itemView); tv = (TextView) itemView.findViewById(R.id.holder_view_tv); } } private static class MyAdapter extends RecyclerView.Adapter { private List mDatas; private List mHeights; public MyAdapter(List datas, List heights) { mDatas = datas; mHeights = heights; } @Override public int getItemCount() { return mDatas.size(); } @Override public void onBindViewHolder(MyViewHolder holder, int position) { holder.tv.setText(mDatas.get(position)); ViewGroup.LayoutParams params = holder.tv.getLayoutParams(); params.height = mHeights.get(position); holder.tv.setLayoutParams(params); } @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.holder_view, parent, false); MyViewHolder myViewHolder = new MyViewHolder(itemView); return myViewHolder; } }} 运行截图
