hello world (android RecyclerView)

1、引入jar包

file ->project structure ->app->library dependency 選擇recyclerVier 

2、增加Obj.java

package com.nndou.yy.recyclertest01;

public class Obj {
    private String name;
    private String des;
    public Obj(String name,String des){
        this.name = name;
        this.des = des;
    }
    public String getName(){
        return name;
    }
    public String getDes(){
        return des;
    }
}

3、增加 ObjAdapter.java

package com.nndou.yy.recyclertest01;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.ArrayList;

/**
 * Created by yy on 16/7/6.
 */
public class ObjAdapter extends RecyclerView.Adapter<ObjAdapter.MyViewHolder>{

    public Context mContext;
    public ArrayList<Obj> mDatas;

    public ObjAdapter(Context mContext, ArrayList<Obj> mDatas) {
        this.mContext = mContext;
        this.mDatas = mDatas;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        MyViewHolder holder = new MyViewHolder(LayoutInflater.from(mContext).inflate(R.layout.raw, parent,
                false));
        return holder;
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        Obj obj = mDatas.get(position);
        holder.objName.setText(obj.getName());
        holder.objDes.setText(obj.getDes());
    }

    @Override
    public int getItemCount() {
        return mDatas.size();
    }

    class MyViewHolder extends RecyclerView.ViewHolder
    {

        TextView objName;
        TextView objDes;

        public MyViewHolder(View view)
        {
            super(view);
            objName = (TextView) view.findViewById(R.id.obj_name);
            objDes = (TextView) view.findViewById(R.id.obj_des);
        }
    }

}

4、增加 raw.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="40dp"
        android:text="New Text"
        android:id="@+id/obj_name"
        android:layout_marginLeft="10dp"
        android:gravity="center"
        />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="40dp"
        android:text="New Text"
        android:id="@+id/obj_des"
        android:layout_marginLeft="10dp"
        android:gravity="center"
        />
</LinearLayout>

5、增加控件

<android.support.v7.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/rlist"
    >

6、增加功能代碼

package com.nndou.yy.recyclertest01;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private ObjAdapter mAdapter;
    private ArrayList<Obj> mDatas = new ArrayList<Obj>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initData();
        mAdapter = new ObjAdapter(this,mDatas);
        mRecyclerView = (RecyclerView) findViewById(R.id.rlist);
        //mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        //mRecyclerView.setLayoutManager(new GridLayoutManager(this,4));
        //mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.HORIZONTAL));
        mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL));


        mRecyclerView.setAdapter(mAdapter);
    }

    private void initData() {
        for(int i = 0;i<200;i++){
            Obj obj = new Obj("a"+i,"b"+i);
            mDatas.add(obj);
        }
    }
}