Android——网格视图 GridView

activity_activitygrid.xml

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/gdvw_1"
    android:numColumns="4"
    android:verticalSpacing="30dp"
    android:horizontalSpacing="30dp"
    android:columnWidth="120dp"
    android:gravity="center"
    android:stretchMode="columnWidth">
<!--numColumns:列数
    verticalSpacing:垂直间距
    horizontalSpacing：水平间距
    columnWidth：列宽
    stretchMode：元素缩放模式-->
</GridView>

Activitygrid.java

显示内容都为图片，未用xml文件在外加载组件，直接在java代码里面写的

package com.example.chenshuai.test321;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
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.Toast;

public class Activitygrid extends AppCompatActivity {

    //只需要获得图片的id
    int[] imgid;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_activitygrid);

        GridView gdvw_1 = (GridView)findViewById(R.id.gdvw_1);

        imgid=new int[]{R.drawable.anniu3,R.drawable.anniu4,R.drawable.anniu5,R.drawable.anniu6,
                        R.drawable.anniu7,R.drawable.anniu8,R.drawable.anniu9,R.drawable.anniu10,
                        R.drawable.anniu11,R.drawable.anniu12};

        gdvw_1.setAdapter(new MybaseAdapter());

        gdvw_1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                Toast.makeText(Activitygrid.this, "position= "+position, Toast.LENGTH_SHORT).show();
            }
        });
    }

    class MybaseAdapter extends BaseAdapter{
        @Override
        public int getCount() {
            return imgid.length;
        }

        @Override
        public Object getItem(int position) {
            return imgid[position];
        }

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

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            //通过position  获取数据
            int imageid = imgid[position];

            ImageView imageView_1=null;
            //不用加载layout文件的方法
            //只需要图片视图 直接构造视图

            if (convertView == null)
            {
                imageView_1 = new ImageView(Activitygrid.this);
                imageView_1.setLayoutParams(new GridView.LayoutParams(150, 150));
                imageView_1.setScaleType(ImageView.ScaleType.FIT_XY);
            }
            else
            {
                imageView_1 = (ImageView)convertView;
            }

            imageView_1.setImageResource(imageid);
            return imageView_1;
        }
    }
}