[Android Pro] RecyclerView实现瀑布流效果（二）
referece to : http://blog.csdn.net/u010687392
在上篇中我们知道RecyclerView中默认给我们提供了三种布局管理器，分别是LinearLayoutManager、 GridLayoutManager、StaggeredGridLayoutManager。其中 StaggeredGridLayoutManager可实现交错式网格布局，正好可以用来实现瀑布流。
下面先看看效果图吧，再贴代码：
其中大部分内容实现其实是和上篇文章是一样的，就不多叙述了，就一个地方不同，就是我们在适配器中绑定ViewHolder的方法中需要重新给我们的itemView布局设置height，我这里是生成随机数来设置高度的，代码实现为：
private void getRandomHeight(List<String> lists){//得到随机item的高度 heights = new ArrayList<>(); for (int i = 0; i < lists.size(); i++) { heights.add((int)(200+Math.random()*400)); } }
在onBindViewHolder方法中：
ViewGroup.LayoutParams params = holder.itemView.getLayoutParams();//得到item的LayoutParams布局参数 params.height = heights.get(position);//把随机的高度赋予itemView布局 holder.itemView.setLayoutParams(params);//把params设置给itemView布局
从而实现瀑布流效果。
贴一下代码吧：
MainActivity.java
public class MainActivity extends AppCompatActivity { private RecyclerView mRecyclerView; private List<String> lists; private MyRecyclerAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initData(); mRecyclerView = (RecyclerView) this.findViewById(R.id.recyclerView); mRecyclerView.setItemAnimator(new DefaultItemAnimator()); // mRecyclerView.addItemDecoration();//设置分割线 mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL));//设置RecyclerView布局管理器为2列垂直排布 adapter = new MyRecyclerAdapter(this,lists); mRecyclerView.setAdapter(adapter); adapter.setOnClickListener(new MyRecyclerAdapter.OnItemClickListener() { @Override public void ItemClickListener(View view, int postion) { Toast.makeText(MainActivity.this,"点击了："+postion,Toast.LENGTH_SHORT).show(); } @Override public void ItemLongClickListener(View view, int postion) { //长按删除 lists.remove(postion); adapter.notifyItemRemoved(postion); } }); } private void initData() { lists = new ArrayList(); for (int i = 0; i < 100; i++) { lists.add("" + i); } } }
MyRecyclerAdapter.java
public class MyRecyclerAdapter extends RecyclerView.Adapter<MyViewHolder> { private List<String> lists; private Context context; private List<Integer> heights; private OnItemClickListener mListener; public MyRecyclerAdapter(Context context,List<String> lists) { this.context = context; this.lists = lists; getRandomHeight(this.lists); } private void getRandomHeight(List<String> lists){//得到随机item的高度 heights = new ArrayList<>(); for (int i = 0; i < lists.size(); i++) { heights.add((int)(200+Math.random()*400)); } } public interface OnItemClickListener{ void ItemClickListener(View view,int postion); void ItemLongClickListener(View view,int postion); } public void setOnClickListener(OnItemClickListener listener){ this.mListener = listener; } @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(context).inflate(R.layout.item,parent,false); MyViewHolder viewHolder = new MyViewHolder(view); return viewHolder; } @Override public void onBindViewHolder(final MyViewHolder holder, int position) { ViewGroup.LayoutParams params = holder.itemView.getLayoutParams();//得到item的LayoutParams布局参数 params.height = heights.get(position);//把随机的高度赋予item布局 holder.itemView.setLayoutParams(params);//把params设置给item布局 holder.mTv.setText(lists.get(position));//为控件绑定数据 if(mListener!=null){//如果设置了监听那么它就不为空，然后回调相应的方法 holder.itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int pos = holder.getLayoutPosition();//得到当前点击item的位置pos mListener.ItemClickListener(holder.itemView,pos);//把事件交给我们实现的接口那里处理 } }); holder.itemView.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View v) { int pos = holder.getLayoutPosition();//得到当前点击item的位置pos mListener.ItemLongClickListener(holder.itemView,pos);//把事件交给我们实现的接口那里处理 return true; } }); } } @Override public int getItemCount() { return lists.size(); } } class MyViewHolder extends RecyclerView.ViewHolder{ TextView mTv; public MyViewHolder(View itemView) { super(itemView); mTv = (TextView) itemView.findViewById(R.id.textView); } }
源码下载地址：http://www.it165.net/uploadfile/files/2015/0705/recyclerView2.rar
转载请注明出处-http://blog.csdn.net/u010687392
分类:
Android Pro
本文转自demoblog博客园博客，原文链接http://www.cnblogs.com/0616--ataozhijia/p/4827433.html如需转载请自行联系原作者
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