Android GridView实现桌面效果

一.在XML文件中设定GridView

    <GridView android:layout_marginTop="10dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/GL"
        android:horizontalSpacing="10dp"
        android:verticalSpacing="10dp"
        android:numColumns="3" />

二.在Activity中初始化GridView

    private GridView gl;
    protected void onCreate(Bundle savedInstanceState) {
        ······
        gl=(GridView) findViewById(R.id.GL);
    ｝

三.初始化适配器，并为适配器初始化数据源

    private List<Map<String, Object>> dataList;
    private int[] icon= {R.drawable.address_book,R.drawable.calendar,
    R.drawable.camera,R.drawable.clock,
    R.drawable.games_control,R.drawable.messenger};
    private String[] iconName={"通讯录","日历","相机","时钟","游戏","短信"};
    private SimpleAdapter adapter;
    protected void onCreate(Bundle savedInstanceState) {
        ·······
        dataList=new ArrayList<Map<String,Object>>();
        adapter=new SimpleAdapter(this, gatData(), R.layout.item,
        new String[]{"pic","text"}, new int[]{R.id.pic,R.id.text});
        gl.setAdapter(adapter);
    }
    private List<Map<String, Object>> gatData() {
        // TODO Auto-generated method stub
        for(int i=0;i<icon.length;i++){
            Map<String, Object> map= new HashMap<String, Object>();
            map.put("pic", icon[i]);
            map.put("text", iconName[i]);
            dataList.add(map);
        }
        return dataList;
    }

代码理解

private List<Map<String, Object>> dataList;
dataList=new ArrayList<Map<String,Object>>();

初始化数据源dataList

for(int i=0;i<icon.length;i++){
Map<String, Object> map=new HashMap<String, Object>();
map.put("pic", icon[i]);
map.put("text", iconName[i]);
dataList.add(map);
}

将icon和iconName中的数据通过key（pic、text）-value（icon[i]、iconName[i]）映射导入新建立的HashMap中，再将该HashMap加入到数据源的末尾

adapter=new SimpleAdapter(this, gatData(), R.layout.item,new String[]{"pic","text"}, new int[]{R.id.pic,R.id.text});

此处new String 中的pic和text分别指向DataList中的key值为pic，text的value，而R.layout.item则是将pic，text通过何种方式显示的布局文件，this则指代该SimpleAdapter所在的上下文

四.编写item数据布局文件

    <ImageView android:layout_width="60dp"
        android:layout_height="60dp"
        android:background="@drawable/ic_launcher"
        android:id="@+id/pic"/>
    
    <TextView  android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:id="@+id/text"
        android:textColor="#ffffff"
        android:text="@string/hello_world"/>

五.为实现窗口效果，要在ManiFest文件中选择无标题栏的主题

        android:theme="@android:style/Theme.Black.NoTitleBar" >

六.通过接口方法设置事件监听器

public class MainActivity extends Activity implements OnItemClickListener{
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
            long id) {
        // TODO Auto-generated method stub
        Toast.makeText(this, "我是"+iconName[position],Toast.LENGTH_SHORT).show();
    }



        gl.setOnItemClickListener(this);