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541天前
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845天前
鸽子
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849天前public class ImageListAdapter extends BaseAdapter { |
private Context context; |
private String[] myImages = null; |
public ImageListAdapter (Context context, String[] myImages) { |
this.context = context; |
this.myImages = myImages; |
} |
@Override |
public int getCount() { |
if (myImages == null) { |
return 0; |
} |
return myImages.length; |
} |
@Override |
public String getItem (int position) { |
if (position < 0 || myImages == null || position > myImages.length) { |
return null; |
} |
return myImages[position]; |
} |
@Override |
public long getItemId (int position) { |
return position; |
} |
@Override |
public View getView (int position, View convertView, ViewGroup parent) { |
View item = null; |
if (convertView != null) { |
item = convertView; |
} else { |
item = View.inflate (context, R.layout.image_item, null); |
} |
final ImageView imageView = (ImageView) item.findViewById (R.id.image); |
final String image = getItem (position); |
if (image == null) { |
return item; |
} |
//对每个图片地址创建一个线程， |
new Thread() { |
public void run() { |
Message msg = new Message(); |
msg.what = 0; |
//getBitmap省略了，就是从网上通过http下载图片，转化成一个Bitmap |
Bitmap bitmap = getBitmap (image); |
List list = new ArrayList(); |
list.add (bitmap); |
list.add (imageView); |
msg.obj = list; |
handler.sendMessage (msg); |
} |
} .start(); |
return item; |
} |
private Handler handler = new Handler() { |
@Override |
public void handleMessage (Message msg) { |
switch (msg.what) { |
case 0://接到从线程内传来的图片bitmap和imageView. |
//这里只是将bitmap传到imageView中就行了。只所以不在线程中做是考虑到线程的安全性。 |
List list = (List) msg.obj; |
Bitmap bitmap = (Bitmap) list.get (0); |
ImageView iv = (ImageView) list.get (1); |
iv.setImageBitmap (bitmap); |
break; |
default: |
super.handleMessage (msg); |
} |
} |
}; |
} |
