RecyclerView的基本用法

//首先主页面代码

public class MainActivity extends AppCompatActivity {
    private List<String> mDatas;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mDatas=new ArrayList<String>();
        for (int i=0;i<10;i++){

            mDatas.add("你好"+i);
        }
        RecyclerView rv= (RecyclerView) findViewById(R.id.rv);
        //ListView
        //rv.setLayoutManager(new LinearLayoutManager(this));
        //GridView
        //rv.setLayoutManager(new GridLayoutManager(this,2));
        //类似于瀑布流
        rv.setLayoutManager(new StaggeredGridLayoutManager(2, OrientationHelper.VERTICAL));
        MyAdapter adapter=new MyAdapter();
        rv.setAdapter(adapter);

}

//适配器代码

<pre name="code" class="java"> public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder>{
        @Override
        public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

            MyViewHolder holder=new MyViewHolder(LayoutInflater.from(MainActivity.this).inflate(R.layout.item,parent,false));

            return holder;
        }

        @Override
        public void onBindViewHolder(MyViewHolder holder, int position) {
            holder.tv.setText(mDatas.get(position)+"");

<span style="white-space:pre">	</span>    //如果想实现瀑布流就给每个item随机的高
            /*ViewGroup.LayoutParams params=holder.itemView.getLayoutParams();
            ArrayList<Integer> height=new ArrayList<Integer>();
            for (int i=0;i<mDatas.size();i++){
                height.add((int)(200+Math.random()*400));
            }
            params.height=height.get(position);*/
        }

        @Override
        public int getItemCount() {
            return mDatas.size();
        }
        class MyViewHolder extends ViewHolder
        {

            TextView tv;

            public MyViewHolder(View view)
            {
                super(view);
                tv = (TextView) view.findViewById(R.id.id_num);
            }
        }
    }

//主布局的文件

     <android.support.v7.widget.RecyclerView
        android:id="@+id/rv"
        android:divider="#ffff0000"
        android:dividerHeight="10dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

//item布局文件

<pre name="code" class="html">      <TextView
        android:id="@+id/id_num"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="1" />