<简单>RecyclerView仿新闻头条的频道管理

需要在build里添加依赖

  compile 'com.android.support:recyclerview-v7:25.3.1'

布局文件activity_main

 <android.support.v7.widget.RecyclerView
        android:layout_weight="1"
        android:id="@+id/recyclerView_up"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    </android.support.v7.widget.RecyclerView>
    <!--用来划分上下的频道-->
    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#999999">

    </View>

    <android.support.v7.widget.RecyclerView
        android:layout_weight="1"
        android:id="@+id/recyclerView_down"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    </android.support.v7.widget.RecyclerView>

在layout下定义一个message.xml布局文件,用来显示RecyclerView里的文字,跟listview的意义差不多

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        android:padding="3dp"
        android:text="123123123" />

写一个 MyItemOnClickListener 接口用来监听点击事件,在里边传入两个参数,第一个是试图,第二是点击的下标

public interface MyItemOnClickListener  {
    void onClick(View view,int position);
}

RecyclerView的适配器类

//RecyclerView.Adapter<?>里写的是优化继承ViewHolder的帮助类
public class ViewAdapter extends RecyclerView.Adapter<ViewAdapter.MyViewHolder> {

    private Context mContext;
    /**
    *特别注意一下mList后面一定要默认赋值,不然运行的时候会报错,因为我们默认上面的RecyclerView是没有添加数据的 
    */
    private List<String> mList=new ArrayList<>();
    private MyItemOnClickListener myItemOnClickListener;

    public ViewAdapter(Context context) {
        this.mContext = context;
    }
    //传数组的方法
    public void setMessage(List<String> list) {
        this.mList = list;
    }
    //写个方法把接口传过来
    public void setMyItemOnClickListener(MyItemOnClickListener myItemOnClickListener) 
    {
        this.myItemOnClickListener = myItemOnClickListener;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //打气筒填充我们自定义的message.xml的试图
        View view = View.inflate(mContext, R.layout.messgae, null);
        //优化
        final MyViewHolder holder = new MyViewHolder(view);
        //监听
        view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //调用我们自定义接口的方法
                myItemOnClickListener.onClick(v, holder.getLayoutPosition());
            }
        });
        return holder;
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        MyViewHolder viewHolder = holder;
        viewHolder.textView.setText(mList.get(position));
    }

    @Override
    public int getItemCount() {
        return mList.size();
    }
    //ViewHolder优化
    static class MyViewHolder extends RecyclerView.ViewHolder {
        private TextView textView;

        public MyViewHolder(View itemView) {
            super(itemView);
            textView = (TextView) itemView.findViewById(R.id.textView);
        }
    }
}

在MainActivity的实现

public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView_up;
    private RecyclerView recyclerView_down;
    private List<String> listUp = new ArrayList<>();
    private List<String> listDown = new ArrayList<>();
    private ViewAdapter adapterUp;
    private ViewAdapter adapterDown;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //添加数据
        initData();
        initView();
    }
    public void initData(){
    //添加数据
        for (int i = 0; i < 15; i++) {
        //默认的我们只给下面的RecyclerView添加了数据
            listDown.add("频道管理" + i);
        }
    }

    private void initView() {
        recyclerView_up = (RecyclerView) findViewById(R.id.recyclerView_up);
        recyclerView_down = (RecyclerView) findViewById(R.id.recyclerView_down);

        initUp();
        initDown();
    }

    private void initUp() {
        //创建适配器
        adapterUp = new ViewAdapter(MainActivity.this);
        //添加数据,我们默认创建的时候是空的
        adapterUp.setMessage(listUp);
        recyclerView_up.setAdapter(adapterUp);
        //RecyclerView显示样式
        GridLayoutManager gridLayoutManagerUp = new GridLayoutManager(this, 3);
        recyclerView_up.setLayoutManager(gridLayoutManagerUp);
        //点击监听
        adapterUp.setMyItemOnClickListener(new MyItemOnClickListener() {
            @Override
            public void onClick(View view, int position) {
                Log.e("Up", "上" + position);

                //下面的RecyclerView添加当前点击的条目信息并刷新数组
                listDown.add(listUp.get(position));
                adapterDown.setMessage(listDown);
                adapterDown.notifyDataSetChanged();

                //从当前数组移除数据并刷新数组
                listUp.remove(position);
                adapterUp.setMessage(listUp);
                adapterUp.notifyDataSetChanged();
            }
        });
    }

    private void initDown() {
        adapterDown = new ViewAdapter(MainActivity.this);
        adapterDown.setMessage(listDown);
        recyclerView_down.setAdapter(adapterDown);
        GridLayoutManager gridLayoutManagerDown = new GridLayoutManager(this, 3);
        recyclerView_down.setLayoutManager(gridLayoutManagerDown);
        adapterDown.setMyItemOnClickListener(new MyItemOnClickListener() {
            @Override
            public void onClick(View view, int position) {
                Log.e("Down", "下" + position);


                //下面的RecyclerView添加当前点击的条目信息并刷新数组
                listUp.add(listDown.get(position));
                adapterUp.setMessage(listUp);
                adapterUp.notifyDataSetChanged();

                //从当前数组移除数据并刷新数组
                listDown.remove(position);
                adapterDown.setMessage(listDown);
                adapterDown.notifyDataSetChanged();
            }
        });
    }
}