gridview Adapter怎么写

[rocksent]

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);

[hotkarriver]

1楼正解inflate

[b87936260]

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);

[聚集美丽]

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

[聚集美丽]

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

[悲催的码农]

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