安卓作业：
使用GridView和SimpleAdapter实现手机界面常见的九宫格，图片可以任意选择，注意图片大小
1，主xml文件
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_qiu" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingBottom="@dimen/activity_vertical_margin" tools:context="cn.edu.niit.jiugongge.QiuActivity"> <GridView android:id="@+id/gridView" android:layout_width="fill_parent" android:layout_height="wrap_content" android:numColumns="auto_fit"/><!--定义每行显示的列数，auto_fit自定义--> /></RelativeLayout>2.建立一个新的activity_imageview
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView android:id="@+id/img" android:layout_width="wrap_content" android:layout_height="100dp" android:paddingTop="10dp" android:paddingLeft="10dp" android:paddingRight="10dp" android:layout_gravity="center" android:scaleType="fitXY" /> </LinearLayout>3.java文件代码
package cn.edu.niit.jiugongge;
import android.support.v7.app.AppCompatActivity;import android.os.Bundle;
public class QiuActivity extends AppCompatActivity {
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_qiu)
public class DzzyFragment extends Fragment {
private GridView gridView;
private int[] imgs = { };//图片资源
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_dzzy, container, false);
setHasOptionsMenu(true);
gridView = (GridView) view.findViewById(R.id.gridView);
ArrayList<HashMap<String, Object>> imagelist = new ArrayList<HashMap<String, Object>>();
for (int i = 0; i < imgs.length; i++) {
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("img", imgs[i]);
imagelist.add(map);
}
SimpleAdapter sa = new SimpleAdapter(getActivity()
.getApplicationContext(), imagelist,
R.layout.activity_dzzy_item2, new String[] { "img" },
new int[] { R.id.img });
gridView.setAdapter(sa);
return view;
}
}