RecyclerView的使用

创建步骤：

创建activity，顺便创建.xml文件，将recyclerView控件加入到.xml文件中去

在XXXActivity文件的onCreate(Bundle savedInstanceState)中进行编写

通过 findViewById找到控件

//获取RecyclerView对象
 mRecyclerView = findViewById(R.id.hole_rv);

配置layoutManager

//设置layoutManager
LinearLayoutManager layoutManager = new LinearLayoutManager(HoleActivity.this);
mRecyclerView.setLayoutManager(layoutManager);

配置adapter(并编写java类)

//设置adapter
mMyAdapter = new HoleAdapter(HoleActivity.this, post_list);
mRecyclerView.setAdapter(mMyAdapter);

设置Decoration分割线

//设置Decoration分割线
DividerItemDecoration decoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL);
decoration.setDrawable(getResources().getDrawable(R.drawable.divider, null));
mRecyclerView.addItemDecoration(decoration);

编写adapter类文件

创建myAdapter文件并进行编写

首先extends RecyclerView.Adapter

编写构造函数(一般需要语境context以及数据list)

public HoleAdapter(Context hole_context, List list) {
    context = hole_context;
    post_list = list;
}

再编写自己的myHolderr类，用来获取item对象(需要先创建item_XXX.xml文件)

public class myHolder extends RecyclerView.ViewHolder {
    TextView post_text;

    public myHolder(@NonNull View itemView) {
        super(itemView);
        post_text = itemView.findViewById(R.id.item_tv);
    }
}

将RecyclerView.Adapter 改为RecyclerView.Adapter

重写函数onCreateViewHolder()(绑定item视图)

@NonNull
@Override
public myHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_hole, parent, false);
    myHolder myHolder = new myHolder(view);
    return myHolder;
} 

重写函数onBindViewHolder()(绑定item数据)

@Override
public void onBindViewHolder(@NonNull myHolder holder, int position) {
    post post = post_list.get(position);
    holder.post_text.setText(post.post_context);
}

重写函数getItemCount()(返回item个数)

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

至此Recycler的设置完成