使用AsyncTask下载多张网络图片
for (int i =0; i < item.getUrls().size();i++){
new AsynPicTask().execute(item.getUrls().get(i));
}
在onPostExecute回调方法里保存下载好的图片
class AsynPicTaskextends AsyncTask {
@Override
protected BitmapdoInBackground(String... imagUrl) {
Bitmap bitmap =null;
try {
URL url =new URL(imagUrl[0]);
URLConnection urlConnection = url.openConnection();
urlConnection.setConnectTimeout(3000);
urlConnection.connect();
InputStream inputStream = urlConnection.getInputStream();
bitmap = BitmapFactory.decodeStream(inputStream);
inputStream.close();
}catch (MalformedURLException e) {
e.printStackTrace();
}catch (IOException e) {
e.printStackTrace();
}
return bitmap;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@SuppressLint("WrongThread")
@Override
protected void onPostExecute(Bitmap bitmap) {
// 首先保存图片
String storePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator +"akxy";
File appDir =new File(storePath);
if (!appDir.exists()) {
appDir.mkdir();
}
String fileName = System.currentTimeMillis() +".jpg";
File file =new File(appDir, fileName);
try {
FileOutputStream fos =new FileOutputStream(file);
//通过io流的方式来压缩保存图片
if(bitmap!=null) {
bitmap.compress(Bitmap.CompressFormat.JPEG, 60, fos);
fos.flush();
fos.close();
}
//保存图片后发送广播通知更新数据库
Uri uri = Uri.fromFile(file);
mcontext.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));
}catch (IOException e) {
e.printStackTrace();
}
}
}
