RecyclerView竖直和水平的瀑布流布局

设置布局管理者添加给RecyclerView

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.rv);        //设置布局管理者        //LinearLayoutManager：分竖直 横向        //Ctrl+Alt+M抽取代码        RecyclerView.LayoutManager layoutManger = getVerticalStaggered();        recyclerView.setLayoutManager(layoutManger);        //设置适配器        //        MyAdapter adapter=new MyAdapter();        //        recyclerView.setAdapter(adapter);        MyStaggerdGridAdapter adapter = new MyStaggerdGridAdapter();        recyclerView.setAdapter(adapter);    }    private RecyclerView.LayoutManager getVerticalStaggered() {        //1.spanCout 列数        //2.方向        return new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL);    }    private RecyclerView.LayoutManager getHStaggered() {        //1.spanCout 列数        //2.方向        return new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.HORIZONTAL);    }}

onCreateViewHolder 和onBindViewHolder 方法中设置高度，或者宽度来调整布局。

/*** Created by Administrator on 2016/11/30.*///是什么？是一堆  get方法 。由rv,lv,gv viewpager调用// RecyclerView.Adapter封装了 getView优化//条目的高度由什么决定 ？由内容的高度public class MyStaggerdGridAdapter extends RecyclerView.Adapter {    //1.7 泛型自动推断    private List list = new ArrayList<>();    public MyStaggerdGridAdapter() {        for (int i = 0; i < 30; i++) {            list.add("经验值" + i);        }    }    //条目数量    @Override    public int getItemCount() {        return list.size();    }    //RecyclerView.ViewHolder是缓存条目控件    @Override    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        int itemId = R.layout.item;        // View itemView=View.inflate(parent.getContext(),itemId,null);        //1.条目布局        //2.RecyclerView  传入给item参考宽度        //3.是否把打气布局添加到父控件 true添加,报错 二次添加  false,不添加 仅参考宽度        View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_grid, parent, false);        MyViewHolder myViewHolder = new MyViewHolder(itemView);        //字段        return myViewHolder;    }    private Random random = new Random();    @Override    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {        MyViewHolder hd = (MyViewHolder) holder;        //数据        String item = list.get(position);        hd.text.setText(item);        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) hd.img.getLayoutParams();        params.width = RelativeLayout.LayoutParams.MATCH_PARENT;        params.height = 200 + random.nextInt(50);        System.out.println(params);    }    static class MyViewHolder extends RecyclerView.ViewHolder {        @BindView(R.id.img)        ImageView img;        @BindView(R.id.text)        TextView text;        @BindView(R.id.activity_main)        RelativeLayout activityMain;        public MyViewHolder(View itemView) {            super(itemView);            ButterKnife.bind(this, itemView);        }    }}

更多相关文章

随机推荐