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;  

    }  

}  

GridView和SimpleAdapter九宫格作业