RecylerView之Grid显示

先看一下 运行效果

该篇文章 是基于上一篇 RecylerView之list显示 的基础上添加的 如想详细了解 请看上一篇

先看一下 MainActivity 中的代码

   private void loadGridData(boolean invresion, boolean orinetion ) {
        ArrayList<DataBean> datas = new ArrayList<>();
        //给bean类放数据，最好把装好数据的bean类放到集合里
        for(int i=0;i<35;i++){
            DataBean dataBean=new DataBean();
            dataBean.icon=R.drawable.ren;
            dataBean.name="picture"+i;

            //bean类放入集合里
            datas.add(dataBean);


        }
        RecylerGridAdapter gridAdapter = new RecylerGridAdapter(datas,this);
        recyclerView.setAdapter(gridAdapter);
        //布局管理器，参数：上下文 规定显示几列
        GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 3);
        gridLayoutManager.setReverseLayout(invresion);
        gridLayoutManager.setOrientation(orinetion ?  LinearLayoutManager.VERTICAL : LinearLayoutManager.HORIZONTAL);
           recyclerView.setLayoutManager(gridLayoutManager);
    }

在 onOptionsItemSelected（）方法里添加：

 if (itemId == R.id.action_grid){
            //标准显示
            loadGridData(false,true);
            Toast.makeText(MainActivity.this,"你好",Toast.LENGTH_SHORT).show();
            return true;
        }//list垂直反向显示
        else if (itemId == R.id.action_grid_vertical){
            loadGridData(true,true);
        }//水平显示
        else if(itemId == R.id.action_grid_horiztal){
            loadGridData(false,false);
        }//水平反向显示
        else if(itemId == R.id.action_grid_horiztalwest){
            loadGridData(true,false);
        }

其对应的自定义适配器：

public class RecylerGridAdapter extends RecyclerView.Adapter<RecylerGridAdapter.GridHolder> {
    private List<DataBean> dataBeen;
    private Context context;

    public RecylerGridAdapter(List<DataBean> dataBeen, Context context) {
        this.dataBeen = dataBeen;
        this.context = context;
    }

    @Override
    public GridHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //转换一个view布局对象，决定了item的样子 参数：1 上下文 2 xml布局文件
        View itemview = View.inflate(context, R.layout.item_grid, null);
        //创建一个viewHolder对象
        GridHolder gridHolder = new GridHolder(itemview);
       // ListViewHolder listViewHolder = new ListViewHolder(itemview);
        //把viewHolder对象传递出去
        return gridHolder;

    }

    @Override
    public void onBindViewHolder(GridHolder holder, int position) {
        DataBean dataBean = dataBeen.get(position);
        holder.setData(dataBean);


    }

    @Override
    public int getItemCount() {
        if(dataBeen !=null && dataBeen.size()>0){
            return dataBeen.size();
        }
        return 0;
    }

    public class GridHolder extends RecyclerView.ViewHolder {

        private final ImageView imgView;
        private final TextView textView;

        public GridHolder(View itemView) {
            super(itemView);
            imgView =(ImageView) itemView.findViewById(R.id.item_iv_icon);
             textView = (TextView)itemView.findViewById(R.id.list_tv_name);
        }

        public void setData(DataBean data) {
           imgView.setImageResource(data.icon);
            textView.setText(data.name);

        }
    }
}

其对应的xml文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:gravity="center" android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <ImageView
        android:src="@drawable/pic7"
        android:id="@+id/item_iv_icon"
        android:layout_width="75dp"
        android:layout_height="75dp" />
    <TextView
        android:text="图片描述"
        android:textSize="20sp"
        android:textStyle="bold"
        android:id="@+id/list_tv_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>