Android攻城狮GridView（主菜单）

Posted 2020-09-10 张兮兮

GridView
布局文件声明GridViewjava里创建GridView 配置
1、准备数据源 
2、新建适配器（SimpleAdapter）
3、GridView加载适配器 
4、GridView配置监听器（OnItemClickListener）

gridView实现过程:
1.准备数据源
dataList=new ArrayList<Map<String,Object>>();

2.新建适配器(SimpleAdapter)
adapter=new SimpleAdapter(this,getData(),自定义布局,new String[]{"image","text"},new int[]{R.id.image,R.id.text});
(getData方法内容见笔记附录1)

3.gridView加载适配器
gridView.setAdapter(adapter);

4.gridView配置时间监听器(OnItemClickListener)
插入接口OnItemClickListener
gridView.setOnItemClickListener(this);
(onItemClick见笔记附录2)

1.getData方法内部
private List<Map<String,Object>> getData(){
for(int i=0;i<icon.length;i++){
Map<String,Object>map=new HashMap<String,Object>();
map.put("image",icon[i]);
map.put("text",iconName[i]);
dataList.add(map);
}
return dataList;
}

2.public void onItemClick(...){
Toast.makeText(this,"我是"+iconName[position],Toast.LENGTH_SHORT).show();
}

GridView的三种属性：
android:numColumns="" 每一行显示多少列
android:horizontalSpacing="" 两列之间的距离
android:verticalSpacing="" 两行之间的距离
其中，android:numColumns="auto_fit" 将实现自动适配的效果，但实际上可能不好看，还是应该人为规定有多少列数，同时修改ImageButton的大小，本节的示例是将原来的warp_content改成60dp。

清单文件中：android:theme="@android:style/Theme.Black.NoTitleBar"

 1 public class MainActivity extends Activity implements OnItemClickListener {
 2     private GridView gridView;
 3     private List<Map<String, Object>> dataList;
 4     
 5     private SimpleAdapter adapter;
 6      int[] icon = { R.drawable.g, R.drawable.h, R.drawable.k,
 7                 R.drawable.th_qq, R.drawable.a, R.drawable.b, R.drawable.c,
 8                 R.drawable.d, R.drawable.f, R.drawable.h, };
 9          String[] iconName = { "小白菜", "土豆", "藕片", "南瓜", "番茄", "土豆", "小白菜",
10                 "西瓜", "木耳", "黄瓜", };
11     @Override
12     protected void onCreate(Bundle savedInstanceState) {
13         super.onCreate(savedInstanceState);
14         setContentView(R.layout.fragment_main);
15         gridView=(GridView)findViewById(R.id.gridview1);
16         // 准备数据源
17         // 新建适配器
18         // GridView加载适配器
19         // GridView配置事件监听器（OnItemClinckListener）
20         dataList = new ArrayList<Map<String, Object>>();
21     
22         adapter = new SimpleAdapter(this, getDate(), R.layout.item,
23                 new String[] {"image", "text" }, new int[] { R.id.imageView1,
24                         R.id.text });
25         gridView.setAdapter(adapter);
26         gridView.setOnItemClickListener(this);
27     }
28 
29     private List<Map<String, Object>> getDate() {
30         
31 
32         for(int i=0;i<icon.length;i++){
33         Map<String, Object> map=new HashMap<String, Object>();
34         map.put("image", icon[i]);
35         map.put("text", iconName[i]);
36         dataList.add(map);
37         
38         }
39         return dataList;
40     }
41     @Override
42     public void onItemClick(AdapterView<?> parent, View view, int position,
43             long id) {
44         // TODO Auto-generated method stub
45         
46         Toast.makeText(this, "我是"+iconName[position], 0).show();
47     }