Recycler View

最新推荐文章于 2025-01-24 15:39:41 发布

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最新推荐文章于 2025-01-24 15:39:41 发布

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本文介绍了一个使用Java实现的RecyclerView适配器示例，包括如何创建适配器类、ViewHolder以及如何设置不同的布局管理器来改变列表视图的显示方式。

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/**
 * 适配器
 */

public class Mybase extends RecyclerView.Adapter<Mybase.MyViewHolder> {

    private  List<String> list;
    public Mybase() {
        list = new ArrayList<>();
        for (int i=0;i<30;i++){
            list.add("数量"+i);
        }

    }
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View inflate = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_item, null);
        return new MyViewHolder(inflate);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        holder.item_text.setText(list.get(position));

        if (position%2==1){
            holder.item_img.setImageResource(R.drawable.tu1);
        }

    }

    @Override
    public int getItemCount() {
        return list.size();
    }
    public class MyViewHolder extends RecyclerView.ViewHolder{

        private final TextView item_text;
        private final ImageView item_img;

        public MyViewHolder(View itemView) {
            super(itemView);
            item_text = (TextView) itemView.findViewById(R.id.item_text);
            item_img = (ImageView) itemView.findViewById(R.id.item_img);

        }
    }





//主方法

public class MainActivity extends AppCompatActivity {

    private RecyclerView recycle_main;
    private Button btn_main;
    private LinearLayoutManager linearLayoutManager;
    private GridLayoutManager gridLayoutManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recycle_main = (RecyclerView) findViewById(R.id.recycler_main);
        btn_main = (Button) findViewById(R.id.btn_main);
        linearLayoutManager = new LinearLayoutManager(this);
        gridLayoutManager = new GridLayoutManager(this, 3);
        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                return 3 - position % 3;
            }
        });
        StaggeredGridLayoutManager staggeredGridLayoutManager=new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL);
        recycle_main.setLayoutManager(staggeredGridLayoutManager);
        recycle_main.setAdapter(new Mybase());
        btn_main.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RecyclerView.LayoutManager layoutManager = recycle_main.getLayoutManager();
                if (layoutManager==null){
                    return;
                }
                if (layoutManager instanceof GridLayoutManager){
                    recycle_main.setLayoutManager(linearLayoutManager);
                }else if (layoutManager instanceof LinearLayoutManager){
                    recycle_main.setLayoutManager(gridLayoutManager);
                }
            }
        });
    }
}