Android——RecyclerView

RecyclerView的使用

依赖

kotlin 复制代码

	implementation("androidx.recyclerview:recyclerview:1.4.0")

activity_recyclerview.xml

xml 复制代码

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

RecyclerviewActivity.java

java 复制代码

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

        RecyclerView recyclerView = findViewById(R.id.rv);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(linearLayoutManager);
        RecyclerviewAdapter adapter = new RecyclerviewAdapter(Planet.getDefaultList(), this);
        recyclerView.setAdapter(adapter);
    }

RecyclerviewAdapter.java

java 复制代码

public class RecyclerviewAdapter extends RecyclerView.Adapter<RecyclerviewAdapter.ViewHolder> {
    private List<Planet> data;
    private Context context;


    public RecyclerviewAdapter(List<Planet> data, Context context) {
        this.data = data;
        this.context = context;
    }


    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = View.inflate(context, R.layout.recyclerview_item, null);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        holder.tv.setText(data.get(position).name);
    }

    @Override
    public int getItemCount() {
        return data == null ? 0 : data.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        private TextView tv;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            tv = itemView.findViewById(R.id.tv);
        }
    }
}

绑定点击事件

使用接口实现回调

java 复制代码

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            tv = itemView.findViewById(R.id.tv);

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (mOnItemClickListener != null) {
                        mOnItemClickListener.onRecyclerItemClick(getLayoutPosition());
                    }
                }
            });
        }

在adapter中实现一个接口

java 复制代码

    private OnRecyclerItemClickListener mOnItemClickListener;

    public void setRecyclerItemClickListener(OnRecyclerItemClickListener listener) {
        mOnItemClickListener = listener;
    }

    public interface OnRecyclerItemClickListener {
        void onRecyclerItemClick(int position);
    }

在Activity中传入回调方法

java 复制代码

    adapter.setRecyclerItemClickListener(new RecyclerviewAdapter.OnRecyclerItemClickListener() {
        @Override
        public void onRecyclerItemClick(int position) {
            Log.d("TAG", "" + position);
        }
    });

案例代码