Can't Write File On Sd Card In Android App

I am unable to write file on physical SD card. I want to ask user for permission to write to whole SD card. User grants the permission. Now I want to create file in specific direc

Solution 1:

string targetUri = uriWithPermission + "MyDir/MyFile.MyExt"; // MyDir exists

Even if MyDir exists your code will not work as you have seen as it is not the right uri for a file there.

Also if the user had choosed the MyDir directory and your coude would look like

string targetUri = uriWithPermission + "/MyFile.MyExt";

your code, using an outputstream to create a file, still would not work.

Instead you should use DocumentFile to obtain an instance for the choosen directory. After that you can use DocumentFile.createFile() to create a subdirectory or file.

You do not need the usual permissions in manifest and runtime for this.

Solution 2:

You have to give runtime permission

if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
    Log.v(TAG,"Permission is granted");
    //File write logic herereturntrue;
} else {
    ActivityCompat.requestPermissions(this, newString[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CODE)
}

Solution 3:

check following code it would be help you to understand file save in memory.

@OverridepublicvoidonActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == CAMERA_CAPTURE_IMAGE_REQUEST_CODE && resultCode == RESULT_OK) {
        // Show the thumbnail on ImageViewpreviewMedia();
    } elseif (requestCode == REQUEST_GALLERY_PHOTO && resultCode == RESULT_OK) {
        // Show the thumbnail on ImageViewtry {
            imageUri = data.getData();
            String[] filePathColumn = {MediaStore.Images.Media.DATA};

            Cursor cursor = getActivity().getContentResolver().query(imageUri,
                    filePathColumn, null, null, null);
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            mCurrentPhotoPath = cursor.getString(columnIndex);
            cursor.close();
            bitmap = BitmapFactory.decodeFile(compressImage(mCurrentPhotoPath));
            preview_imageview.setImageBitmap(bitmap);
        } catch (Exception e) {
            e.getMessage();
        }

        // ScanFile so it will be appeared on GalleryMediaScannerConnection.scanFile(getActivity(),
                newString[]{imageUri.getPath()}, null,
                newMediaScannerConnection.OnScanCompletedListener() {
                    publicvoidonScanCompleted(String path, Uri uri) {
                    }
                });
    }
}