Android之网格视图GridView

match_parent表示让当前控件的大小和父布局的大小一样，也就是由父布局来决定当前控件的大小

wrap_content表示让当前的控件大小能够刚好包含里面的内容，也就是由控件内容决定当前控件的大小

---

GridViewActivity和对应页面布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="15dp"
    >

    <GridView
        android:id="@+id/gv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:numColumns="3"
        android:horizontalSpacing="10dp"
        android:verticalSpacing="10dp"
        android:listSelector="@drawable/list_item"
    />
</LinearLayout>

package com.example.test0508;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.bumptech.glide.Glide;

public class GridViewActivity extends AppCompatActivity {

    private GridView mBtGridView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_grid_view);
        mBtGridView = findViewById(R.id.gv);
        mBtGridView.setAdapter(new GridViewAdaptor(GridViewActivity.this));
        mBtGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Toast.makeText(GridViewActivity.this,"点击",Toast.LENGTH_SHORT).show();
            }
        });
    }
}

class GridViewAdaptor extends BaseAdapter{
    private Context context;
    private LayoutInflater mLayoutInflater;

    public GridViewAdaptor(Context context) {
        this.context = context;
        mLayoutInflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return 10;
    }

    @Override
    public Object getItem(int i) {
        return null;
    }

    @Override
    public long getItemId(int i) {
        return 0;
    }

    static class ViewHolder{
        public ImageView imageView;
        public TextView textView;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        ViewHolder holder = null;
        if (view == null){
            view = mLayoutInflater.inflate(R.layout.layout_grid_item,null);
            holder = new ViewHolder();
            holder.imageView = view.findViewById(R.id.iv_gridView);
            holder.textView = view.findViewById(R.id.tv_grid_view_title);
            view.setTag(holder);
        }else {
            holder = (ViewHolder) view.getTag();
        }
        holder.textView.setText("这是标题");
        Glide.with(context).load("https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1589103035&di=dc1056a67b57cbfd46d2dd6f35a3f2ef&src=http://img.mingxing.com/upload/thumb/2015/09-25/0-eLomMg.jpg").into(holder.imageView);
        return view;
    }
}

---

layout_grid_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    >

    <ImageView
        android:id="@+id/iv_gridView"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:scaleType="fitCenter"
        android:background="@color/colorLittleBlue"
        android:src="@drawable/like_filled"
        />

    <TextView
        android:id="@+id/tv_grid_view_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="@color/colorBlack"
        android:gravity="center"
        android:text="Hello"
        android:layout_marginTop="10dp"
        />
</LinearLayout>