将下载的视频从 url 保存到存储，不适用于真实设备（不支持路径）

Question

I am trying to save a video which I downloaded from url to my internal storage. The weird thing is that its working on my personal real device (Samsung j6) and my simulators perfectly fine, but keeps on crashing on some other devices (Samsung s10 and especially huaweis) I have no idea how to fix it and other threads about this topic did not solve my issue at hand.

Down below my code of asking for permission during runtime + downloading the file

if (ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE) ==
                PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA) ==
                PackageManager.PERMISSION_GRANTED) {


            if (post.url != null) {
                holder.sharedPhoto.buildDrawingCache();
                Bitmap bmp = holder.sharedPhoto.getDrawingCache();


                if (ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA) ==
                        PackageManager.PERMISSION_GRANTED) {
                    MediaStore.Images.Media.insertImage(context.getContentResolver(), bmp, "Flax"+post.id, post.url);
                    new SweetAlertDialog(context, SweetAlertDialog.SUCCESS_TYPE)
                            .setTitleText(context.getString(R.string.SUCCESS_IMG_SAVED))
                            .show();
                }
            }

            if (post.vUrl != null && !post.vUrl.equals("")) {
                String mBaseFolderPath = android.os.Environment
                        .getExternalStorageDirectory().getPath()
                        + File.separator
                        + "FolderName" + File.separator;
                if (!new File(mBaseFolderPath).exists()) {
                    new File(mBaseFolderPath).mkdir();
                }

                String fname = post.date.toString();

                Uri downloadUri = Uri.parse(post.vUrl.trim());
                if (downloadUri == null) {
                    return;
                }

                String mFilePath = "file://" + mBaseFolderPath + "/" + fname ;
                DownloadManager.Request req = new DownloadManager.Request(downloadUri);
                req.setDestinationUri(Uri.parse(mFilePath));
                req.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                DownloadManager dm = (DownloadManager) context.getSystemService(context.DOWNLOAD_SERVICE);
                dm.enqueue(req);
                Toast.makeText(context, R.string.video_downloaded, Toast.LENGTH_LONG).show();

            }
        }else {
            ActivityCompat.requestPermissions((Activity) context, new String[]
                    {Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE}, 0);
        }

Works always on my test devices :D

my error code is the following

Fatal Exception: java.lang.SecurityException
Unsupported path /storage/emulated/0/FolderName/1604782936

More of the log

Fatal Exception: java.lang.SecurityException: Unsupported path /storage/emulated/0/FolderName/1604782936
   at android.os.Parcel.createException(Parcel.java:2071)
   at android.os.Parcel.readException(Parcel.java:2039)
   at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:188)
   at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:140)
   at android.content.ContentProviderProxy.insert(ContentProviderNative.java:481)
   at android.content.ContentResolver.insert(ContentResolver.java:1844)
   at android.app.DownloadManager.enqueue(DownloadManager.java:1081)
   at com.flax.de.Cells.PostTabelViewCell.savePost(PostTabelViewCell.java:821)
   at com.flax.de.Cells.PostTabelViewCell.access$1900(PostTabelViewCell.java:78)
   at com.flax.de.Cells.PostTabelViewCell$23.onClick(PostTabelViewCell.java:643)
   at com.android.internal.app.AlertController$AlertParams$3.onItemClick(AlertController.java:1229)
   at android.widget.AdapterView.performItemClick(AdapterView.java:330)
   at android.widget.AbsListView.performItemClick(AbsListView.java:1259)
   at android.widget.AbsListView$PerformClick.run(AbsListView.java:3306)
   at android.widget.AbsListView$3.run(AbsListView.java:4296)
   at android.os.Handler.handleCallback(Handler.java:888)
   at android.os.Handler.dispatchMessage(Handler.java:100)
   at android.os.Looper.loop(Looper.java:213)
   at android.app.ActivityThread.main(ActivityThread.java:8178)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1101)

Any idea how to fix it to work on all devices?

i have added the

        android:requestLegacyExternalStorage="true"

to my manifest

Answer 1

我认为你可以使用 getFilesDir()、getExternalFilesDir() 和 getExternalFilesDirs()