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我有一个壁纸应用程序具有保存图像功能。它的工作正常，但从应用程序下载的图像只显示重新启动移动后。有人可以帮我解决这个问题吗？ 我的下载图片的代码如下所示。图库项目未更新文件下载后
public class SaveTask extends AsyncTask<String , String , String>
\t \t \t {
\t \t \t \t
\t \t \t \t private Context context;
\t \t \t \t private ProgressDialog pDialog;
\t \t \t \t String image_url;
\t \t \t \t URL myFileUrl;
\t \t \t \t String myFileUrl1;
\t \t \t \t Bitmap bmImg = null;
\t \t \t \t File file ;
\t \t \t \t public SaveTask(Context context) {
\t \t \t \t this.context = context;
\t \t \t \t }
\t \t \t \t @Override
\t \t \t \t protected void onPreExecute() {
\t \t \t \t // TODO Auto-generated method stub
\t \t \t \t super.onPreExecute();
\t \t \t \t pDialog = new ProgressDialog(context);
\t \t \t \t pDialog.setMessage("Downloading Image ...");
\t \t \t \t pDialog.setIndeterminate(false);
\t \t \t \t pDialog.setCancelable(false);
\t \t \t \t pDialog.show();
\t \t \t \t }
\t \t \t \t @Override
\t \t \t \t protected String doInBackground(String... args) {
\t \t \t \t // TODO Auto-generated method stub
\t \t \t \t try {
\t \t \t \t myFileUrl = new URL(args[0]);
\t \t \t \t //myFileUrl1 = args[0];
\t \t \t \t HttpURLConnection conn = (HttpURLConnection) myFileUrl.openConnection();
\t \t \t \t conn.setDoInput(true);
\t \t \t \t conn.connect();
\t \t \t \t InputStream is = conn.getInputStream();
\t \t \t \t bmImg = BitmapFactory.decodeStream(is);
\t \t \t \t }
\t \t \t \t catch (IOException e)
\t \t \t \t {
\t \t \t \t e.printStackTrace();
\t \t \t \t }
\t \t \t \t try {
\t \t \t \t String path = myFileUrl.getPath();
\t \t \t \t String idStr = path.substring(path.lastIndexOf('/') + 1);
\t \t \t \t File filepath = Environment.getExternalStorageDirectory();
\t \t \t \t File dir = new File (filepath.getAbsolutePath() + "/Hindi Picture/");
\t \t \t \t dir.mkdirs();
\t \t \t \t String fileName = idStr;
\t \t \t \t file = new File(dir, fileName);
\t \t \t \t FileOutputStream fos = new FileOutputStream(file);
\t \t \t \t bmImg.compress(CompressFormat.JPEG, 75, fos);
\t \t \t \t sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(new File(idStr))));
\t \t \t \t fos.flush();
\t \t \t \t fos.close();
\t \t \t \t
\t \t \t \t }
\t \t \t \t catch (Exception e)
\t \t \t \t {
\t \t \t \t e.printStackTrace();
\t \t \t \t }
\t \t \t \t return null;
\t \t \t \t }
\t \t \t @Override
\t \t \t protected void onPostExecute(String args) {
\t \t \t // TODO Auto-generated method stub
\t \t \t \t Toast.makeText(SlideImageActivity.this, "Image Saved Succesfully Hindi Picture Folder/", Toast.LENGTH_SHORT).show();
\t \t \t \t if (mInterstitial.isLoaded()) {
\t \t \t \t \t \t mInterstitial.show();
\t \t \t \t \t }
\t \t \t pDialog.dismiss();
\t \t \t }
\t \t \t }