RecyclerView方便自己使用

最新推荐文章于 2024-09-30 15:44:47 发布

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最新推荐文章于 2024-09-30 15:44:47 发布

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本文链接：https://blog.youkuaiyun.com/xiao_duo_space/article/details/78045479

本文详细介绍了如何使用RecyclerView创建适配器，包括依赖项的添加、适配器类的定义及其实现方法，并展示了如何在MainActivity中进行初始化及布局设置。

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添加依赖

compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'

//RecyclerView的适配器

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    //声明变量
    private Context context;
    private List<?> list = new ArrayList<>();
    //构造方法
    public MyAdapter(Context context, List<?> list) {
        this.context = context;
        this.list = list;
    }

    @Override
    public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //加载布局
        View view = LayoutInflater.from(context).inflate("要加载的布局",parent,false);
        ViewHolder holder = new ViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(MyAdapter.ViewHolder holder, int position) {
            //给控件赋值的操作
       
    }

    @Override
    public int getItemCount() {
        return list== null?0:list.size();//返回条目数
    }

    public class ViewHolder extends RecyclerView.ViewHolder{
        //布局中的控件
        public ImageView imageView;

        public ViewHolder(View itemView) {
            super(itemView);
            //初始化控件控件
            imageView = (ImageView)itemView.findViewById(R.id.img);
        }
    }
}

//MainActivity的代码
public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private List<?> list = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化控件
        recyclerView = (RecyclerView) findViewById(R.id.my_recycler);
        //设置瀑布流的展示
        StaggeredGridLayoutManager manager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
        //默认布局
        //LinearLayoutManager manager = new LinearLayoutManager(MainActivity.this);
        //GridView样式
        //GridLayoutManager grid = new GridLayoutManager(MainActivity.this,2);
        recyclerView.setLayoutManager(manager);        //设置适配器        recyclerView.setAdapter(new MyAdapter(MainActivity.this,this));
    }}