GridView的标准写法

private GridView gd;

private List<Picture> list;



@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);



    initView();

    initData();

    processData();



}



private void initView() {

    gd = (GridView) findViewById(R.id.gd);

}



private void initData() {

    list = new ArrayList<Picture>();

    // 只能有7张图片，再多就oom了，下次解决图片过多oom的问题

    list.add(new Picture(R.drawable.iv1));

    list.add(new Picture(R.drawable.iv2));

    list.add(new Picture(R.drawable.iv3));

    list.add(new Picture(R.drawable.iv4));

    list.add(new Picture(R.drawable.iv5));

    list.add(new Picture(R.drawable.iv6));

    list.add(new Picture(R.drawable.iv7));



}



private void processData() {

    MyAdapter myAdapter = new MyAdapter(getApplication(), list);

    gd.setAdapter(myAdapter);

}

}

**MyAdapter**

public class MyAdapter extends BaseAdapter {

private Context context;

private List<Picture> list;



public MyAdapter(Context context, List list) {

    this.context = context;

    this.list = list;

}



@Override

public int getCount() {

    return list.size();

}



@Override

public Object getItem(int position) {

    return null;

}



@Override

public long getItemId(int position) {

    return 0;

}



@Override

public View getView(int position, View convertView, ViewGroup parent) {

    ViewHolder holder = new ViewHolder();

    if (convertView == null) {

        // 复用历史缓存对象

        convertView = View.inflate(context, R.layout.item_grid, null);

    }



    holder.iv_icon = (ImageView) convertView.findViewById(R.id.iv_icon);

    Picture picture = list.get(position);

    holder.iv_icon.setBackgroundResource(picture.getRes());



    return convertView;

}



/**

 * 减少findViewById次数

 */

private class ViewHolder {

    ImageView iv_icon;

}

}

**JavaBean**

public class Picture {

private int res;

public Picture(int res) {

super();

this.res = res;

}

public int getRes() {

return res;

}

public void setRes(int res) {

this.res = res;

}

}

**_布局文件_**

<RelativeLayout xmlns:android=“http://schemas.android.com/apk/res/android”

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context="com.example.gridviewDemo.MainActivity" >



<GridView

    android:id="@+id/gd"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:numColumns="3" >

</GridView>