我已经设置了一个 AsyncTask 类来为我在后台做一些事情，这样 UI 在下载图像然后设置为墙纸时不会冻结。
从 onItemCLick 调用我的 AsyncTask 类时，出现错误。
错误状态“构造函数 SetWallpaperAsync(ImageDetailFragment) 未定义”
我对使用 AsyncTask 比较陌生，所以有人会检查我的代码并告诉我哪里出错了，非常感谢，谢谢。
从此类调用（ImageDetailFragment）：
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// TODO Add your menu entries here
super.onCreateOptionsMenu(menu, inflater);
inflater.inflate(R.menu.image_menu, menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.Favoritewallpaper:
case R.id.Setwallpaper:
new SetWallpaperAsync(this).execute(mImageUrl); // <-------- Here - "The constructor SetWallpaperAsync(ImageDetailFragment) is undefined"
}
return true;
}
设置壁纸异步：
public class SetWallpaperAsync extends AsyncTask<String, String, String> {
private Context context;
private ProgressDialog pDialog;
String image_url;
URL mImageUrl;
String myFileUrl1;
Bitmap bmImg = null;
public SetWallpaperAsync(Context context) {
this.context = context;
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pDialog = new ProgressDialog(context);
pDialog.setMessage("Setting Wallpaper...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
try {
mImageUrl = new URL(args[0]);
// myFileUrl1 = args[0];
HttpURLConnection conn = (HttpURLConnection) mImageUrl
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
bmImg = BitmapFactory.decodeStream(is);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String args) {
// TODO Auto-generated method stub
WallpaperManager wpm = WallpaperManager.getInstance(context);
try {
wpm.setBitmap(bmImg);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
pDialog.dismiss();
}
}