gridview Adapter怎么写
重写了BaseAdapter

@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
ImageView imageView;
if(arg1 == null){
imageView = new ImageView(context);
imageView.setLayoutParams(new GridView.LayoutParams(45,45));
imageView.setAdjustViewBounds(false);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
}else{
imageView = (ImageView) arg1;
}
Resources res=getResources();  
int i=res.getIdentifier(arr[arg0],"drawable",getPackageName());  
imageView.setImageResource(R.drawable.default_pic);
return imageView;
}

以上正确的
现在想用布局文件来完成，我把它修改如下

public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
View v ;
if(arg1 == null){
v = (View) findViewById(R.layout.items_img);
ImageView iv1 = (ImageView) v.findViewById(R.id.ItemImage1);
ImageView iv2 = (ImageView) v.findViewById(R.id.ItemImage2);
iv1.setImageResource(R.drawable.default_pic);
iv2.setImageResource(R.drawable.checkbox1);
}else{
v = (ImageView) arg1;
}
return v;
}

items_img.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<ImageView
    android:id="@+id/ItemImage1"
    android:layout_width="100dip"
    android:layout_height="100dip"
    android:layout_centerHorizontal="true"/>
<ImageView
    android:id="@+id/ItemImage2"
    android:layout_width="40dip"
    android:layout_height="40dip"
    android:src="@drawable/checkbox1"
    />
</RelativeLayout>

运行报错，说我这行空指针，不可能啊!
ImageView iv1 = (ImageView) v.findViewById(R.id.ItemImage1);

[解决办法]
v = (View) findViewById(R.layout.items_img);这里错了，v不是find出来的，是LayoutInflator加载出来的
v = LayoutInflater.from(mContext).inflate(R.layout.home_grid_item, null);
[解决办法]
要先手动 加载xml文件，然后再find，随便找一个demo 就可以看到了
[解决办法]
1楼正解inflate
[解决办法]
1楼正解，或者直接获取系统服务
LayoutInflater mLayoutInflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
ViewGroup menuView = (ViewGroup) mLayoutInflater.inflate(
R.layout.gridview_pop, null, true);
menuGrid = (GridView) menuView.findViewById(R.id.gridview);

just like this