Click event of item in recyclerview

The click event of each item of recyclerview is not encapsulated in the component like listview. When the click event of an item is required, it needs to be implemented by yourself. Add a click event for recyclerview in the adapter. The reference is as follows:

For the usage of recyclerview, please refer to: simple usage of recyclerview

Define the callback interface of click event in adapyer of recyclerview:

/**
 * 定义 RecyclerView 选项单击事件的回调接口
 */
public interface OnItemClickListener{
    //参数（父组件，当前单击的View,单击的View的位置，数据）
    void onItemClick(RecyclerView parent,View view,int position,String data);
}

Declare the interface in the adapyer of recyclerview and provide the setter method:

private OnItemClickListener onItemClickListener;
public void setOnItemClickListener(OnItemClickListener onItemClickListener){
    this.onItemClickListener = onItemClickListener;
}

Implement the view.onclicklistener interface in the adapyer class of recyclerview, override the onclick (view view) method, and then set the event listening to the interface:

public class RvAdapter1 extends RecyclerView.Adapter<RvAdapter1.DataViewHolder> implements View.OnClickListener{
    ...
    view.setOnClickListener(this);//设置监听器
    ...
    @Override
    public void onClick(View view) {
        //根据RecyclerView获得当前View的位置
        int position = recyclerView.getChildAdapterPosition(view);
        //程序执行到此，会去执行具体实现的onItemClick()方法
        if (onItemClickListener!=null){
            onItemClickListener.onItemClick(recyclerView,view,position,mList.get(position));
        }
    }
    ...
}

Set the click event of each item through the adapter in mainactivity:

adapter.setOnItemClickListener(new RvAdapter1.OnItemClickListener() {
    @Override
    public void onItemClick(RecyclerView parent,String data) {
        Toast.makeText(MainActivity.this,data,Toast.LENGTH_SHORT).show();
    }
});

/**
 * Created by jzman on 2017/5/13 0013.
 * RecycleView的Adapter
 */
public class RvAdapter1 extends RecyclerView.Adapter<RvAdapter1.DataViewHolder> implements View.OnClickListener{
    private Context mContext;
    private RecyclerView recyclerView;
    private ArrayList<String> mList;

    public RvAdapter1() {}

    public RvAdapter1(Context mContext,ArrayList<String> mList) {
        this.mContext = mContext;
        this.mList = mList;
    }

    /**
     * 用于创建ViewHolder
     * @param parent
     * @param viewType
     * @return
     */
    @Override
    public DataViewHolder onCreateViewHolder(ViewGroup parent,int viewType) {
        View view = LayoutInflater.from(mContext).inflate(R.layout.item,null);
        view.setOnClickListener(this);
        //使用代码设置宽高（xml布局设置无效时）
        view.setLayoutParams(new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT));
        DataViewHolder holder = new DataViewHolder(view);
        return holder;
    }

    /**
     * 绑定数据
     * @param holder
     * @param position
     */
    @Override
    public void onBindViewHolder(DataViewHolder holder,int position) {
        holder.tv_data.setText(mList.get(position));
    }

    /**
     * 选项总数
     * @return
     */
    @Override
    public int getItemCount() {
        return mList.size();
    }

    @Override
    public void onClick(View view) {
        //根据RecyclerView获得当前View的位置
        int position = recyclerView.getChildAdapterPosition(view);
        //程序执行到此，会去执行具体实现的onItemClick()方法
        if (onItemClickListener!=null){
            onItemClickListener.onItemClick(recyclerView,mList.get(position));
        }
    }

    /**
     * 创建ViewHolder
     */
    public static class DataViewHolder extends RecyclerView.ViewHolder{
        TextView tv_data;
        public DataViewHolder(View itemView) {
            super(itemView);
            tv_data = (TextView) itemView.findViewById(R.id.tv_recycle);
        }
    }

    private OnItemClickListener onItemClickListener;
    public void setOnItemClickListener(OnItemClickListener onItemClickListener){
        this.onItemClickListener = onItemClickListener;
    }

    /**
     * 定义RecyclerView选项单击事件的回调接口
     */
    public interface OnItemClickListener{
        //参数（父组件，当前单击的View,单击的View的位置，数据）
        void onItemClick(RecyclerView parent,String data);
    }
    /**
     *   将RecycleView附加到Adapter上
     */
    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
        this.recyclerView= recyclerView;
    }
    /**
     *   将RecycleView从Adapter解除
     */
    @Override
    public void onDetachedFromRecyclerView(RecyclerView recyclerView) {
        super.onDetachedFromRecyclerView(recyclerView);
        this.recyclerView = null;
    }
}

/**
 * Created by jzman on 2017/5/13 0013.
 */
public class MainActivity extends AppCompatActivity {
    private RecyclerView rv;
    RvAdapter1 adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        rv = (RecyclerView) findViewById(R.id.rv);
        //设置布局管理器
//        rv.setLayoutManager(new linearlayoutmanager(this));//线性
        rv.setLayoutManager(new GridLayoutManager(this,4));//线性
//        rv.setLayoutManager(new StaggeredGridLayoutManager(4,StaggeredGridLayoutManager.VERTICAL));//线性
        adapter = new RvAdapter1(this,initData());
        adapter.setOnItemClickListener(new RvAdapter1.OnItemClickListener() {
            @Override
            public void onItemClick(RecyclerView parent,String data) {
                Toast.makeText(MainActivity.this,Toast.LENGTH_SHORT).show();
            }
        });

        rv.setAdapter(adapter);
    }
    public static ArrayList<String> initData(){
        ArrayList<String> arrayList = new ArrayList<>();
        for (int i=0;i<50;i++){
            arrayList.add("第"+i+"条数据");
        }
        return arrayList;
    }
}

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