Android课程---如何用网格视图做出手机桌面APP

<?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/gv_1"
    android:numColumns="3"
    android:verticalSpacing="10dp"
    android:horizontalSpacing="10dp"
    android:columnWidth="90dp"
    android:gravity="center"
    android:stretchMode="columnWidth">

    <!--android:numColumns="auto_fit" ，GridView的列数设置为自动
        android:columnWidth="90dp"，每列的宽度，也就是Item的宽度
        android:stretchMode="columnWidth"，缩放与列宽大小同步
        android:verticalSpacing="10dp"，两行之间的边距，
        如：行一(NO.0~NO.2)与行二(NO.3~NO.5)间距为10dp
        android:horizontalSpacing="10dp"，两列之间的边距。-->
</GridView>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingBottom="4dp">

    <ImageView
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_centerHorizontal="true"
        android:id="@+id/app_Image">
    </ImageView>
    <TextView
        android:layout_width="wrap_content"
        android:layout_below="@+id/app_Image"
        android:layout_height="wrap_content"
        android:text="TextView01"
        android:layout_centerHorizontal="true"
        android:id="@+id/app_Text">
    </TextView>

</RelativeLayout>

package com.hanqi.test3;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.SimpleAdapter;

import java.util.ArrayList;
import java.util.HashMap;

public class TestActivity extends AppCompatActivity {
    int[] imid;
    String[] name;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test);

        GridView gv_1 =(GridView)findViewById(R.id.gv_1);

        imid = new int[]{R.drawable.apps,R.drawable.book,R.drawable.compass,R.drawable.contacts,
                R.drawable.driving,R.drawable.mail,R.drawable.maps,R.drawable.media,
                R.drawable.message,R.drawable.music,R.drawable.webs,R.drawable.youtube};
        name = new String[]{"APP","书","指南针","联系我们", "驾驶模式"
                ,"邮件","地图","媒体","信息","音乐","网络","电视"};

        //生成动态数组，并且转入数据
        ArrayList<HashMap<String, Object>> lstImageItem = new ArrayList<HashMap<String, Object>>();
        for(int i=0;i<imid.length;i++)
        {
            HashMap<String, Object> map = new HashMap<String, Object>();
            map.put("ItemImage", imid[i]);//添加图像资源的ID
            map.put("ItemText",name[i]);//按序号做ItemText
            lstImageItem.add(map);
        }
        //生成适配器的ImageItem <====> 动态数组的元素，两者一一对应
        SimpleAdapter saImageItems = new SimpleAdapter(this,
                lstImageItem,//数据来源
                R.layout.activity_test2,//activity_test2的XML实现

                //动态数组与ImageItem对应的子项
                new String[] {"ItemImage","ItemText"},

                //ImageItem的XML文件里面的一个ImageView,两个TextView ID
                new int[] {R.id.app_Image,R.id.app_Text});
        //添加并且显示
        gv_1.setAdapter(saImageItems);
        //添加消息处理
        gv_1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            }
        });
    }

    //当AdapterView被单击(触摸屏或者键盘)，则返回的Item单击事件
    class  ItemClickListener implements AdapterView.OnItemClickListener {
        public void onItemClick(AdapterView<?> arg0,//The AdapterView where the click happened
                                View arg1,//The view within the AdapterView that was clicked
                                int arg2,//The position of the view in the adapter
                                long arg3//The row id of the item that was clicked
        ) {
            //在本例中arg2=arg3
            HashMap<String, Object> item = (HashMap<String, Object>) arg0.getItemAtPosition(arg2);
            //显示所选Item的ItemText
            setTitle((String) item.get("ItemText"));
        }

    }
}