GridView和SimpleAdapter

这次的作业是用GridView和SimpleAdapter完成九宫格的手机界面的九宫格

1）在xml中添加GridView用于显示一个网格，代码：

<GridView
android:id="@+id/GridView1"
android:horizontalSpacing="10dp"
android:verticalSpacing="20dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:numColumns="3"/>

2）然后，创建每一项的布局activity.xml的代码：

接下来要准备数据源和创建适配器并绑定，其相关的Java代码为：

public class MainActivity extends AppCompatActivity {
private GridView gv;
private int[] img = {R.drawable.blue, R.drawable.cat, R.drawable.fish, R.drawable.gray, R.drawable.sun,
        R.drawable.tree, R.drawable.tuzi, R.drawable.view, R.drawable.yezi};
private List<Integer> list = new ArrayList<Integer>();
@Override
protected void onCreate(Bundle savedInstanceState) {
    setContentView(R.layout.activity_main);
    GridView gv = (GridView) findViewById(GridView1);
    SimpleAdapter adapter = new SimpleAdapter(this, getData(), R.layout.support_simple_spinner_dropdown_item, new String[]{"img"},
            new int[]{R.id.image});
    gv.setAdapter(adapter);
 //创建适配器并绑定
}
 //准备数据源，添加图片的数据
   private ArrayList<Map<String, Object>> getData() {
     ArrayList<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
    Map<String, Object> map = new HashMap<String, Object>();
    map.put("img", R.drawable.blue);
    list.add(map);
    map = new HashMap<String, Object>();
    map.put("img", R.drawable.cat);
    list.add(map);
    map = new HashMap<String, Object>();
    map.put("img", R.drawable.fish);
    list.add(map);
    map = new HashMap<String, Object>();
    map.put("img", R.drawable.gray);
    list.add(map);
    map = new HashMap<String, Object>();
    map.put("img", R.drawable.sun);
    list.add(map);
    map = new HashMap<String, Object>();
    map.put("img", R.drawable.tree);
    list.add(map);
    map = new HashMap<String, Object>();
    map.put("img", R.drawable.tuzi);
    list.add(map);
    map = new HashMap<String, Object>();
    map.put("img", R.drawable.view);
    list.add(map);
    map.put("img", R.drawable.yezi);
    list.add(map);
    return list;
}
 }