How to save and check if the file exists in scoped storage?

Question

Till now, I check whether a file exists or not and if it does not then I save it to the device in Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) but it is not supported from Android 10.

So I tried to use mediastore API for saving the image.

READ_STORAGE_PERMISSION -> NOT ALLOWED

First I query the contentresolver to check the existence of the file with the following code:

                Uri collection = null;
                collection = MediaStore.Images.Media.getContentUri(MediaStore.VOLUME_EXTERNAL);
                String[] PROJECTION = new String[]{MediaStore.Images.Media.DISPLAY_NAME,
                        MediaStore.MediaColumns.RELATIVE_PATH};
                String QUERY = MediaStore.Files.FileColumns.RELATIVE_PATH + " like ? and " + 
                MediaStore.Files.FileColumns.DISPLAY_NAME + " like ?";

                ContentResolver mContentResolver = this.getContentResolver();
                Cursor cursor = mContentResolver.query(collection, PROJECTION, QUERY , new String[]{"%" + dirName + "%", "%" + fname + "%"}, null);

                if (cursor != null) {
                    Log.d("upisdk", "cursor != null");
                    if (cursor.getCount() > 0) {

                    } else {
                   
                    }
                }

If the cursor is empty, then it means that the file does not exists and I will save the file using code

ContentResolver contentResolver = getContentResolver();
                        ContentValues contentValues = new ContentValues();
                        contentValues.put(MediaStore.MediaColumns.DISPLAY_NAME, fname);
                        contentValues.put(MediaStore.MediaColumns.MIME_TYPE, "image/jpg");
                        contentValues.put(MediaStore.MediaColumns.RELATIVE_PATH, dirName);
                        Uri imageUri = 
                        contentResolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues);

                        fos = contentResolver.openOutputStream(Objects.requireNonNull(imageUri));
                        finalBitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
                        Objects.requireNonNull(fos).close();

Now If everything is working fine until I delete the App data.

After deleting the data, the folder is still there and the previously saved file also. Now If the query the contentresolver for that file, it is giving cursor empty. If the READ_STORAGE_PERMISSION is not allowed then it is happening. If I allow the READ_STORAGE_PERMISSION then it is giving me the cursor non-empty. On the other hand, If i try to save a new different image and query the resolver then I am getting non-empty cursor even without the READ_STORAGE_PERMISSION.

Please tell me what I am doing wrong.

Answer 1

Solution-1

---

private fun getUriFromPath(displayName: String): Uri? {
        val photoId: Long
        val photoUri = MediaStore.Images.Media.getContentUri("external")
        val projection = arrayOf(MediaStore.Images.ImageColumns._ID)
        val cursor = contentResolver.query(
            photoUri,
            projection,
            MediaStore.Images.ImageColumns.DISPLAY_NAME + " LIKE ?",
            arrayOf(displayName),
            null
        )!!
        cursor.moveToFirst()
        val columnIndex = cursor.getColumnIndex(projection[0])
        photoId = cursor.getLong(columnIndex)
        cursor.close()
        return Uri.parse("$photoUri/$photoId")
    }

if you want you can add relative path too to find at specific location

check using file name

private fun isExist(){
        val pathOfImage=getUriFromPath("myimage.png")
        val isExist = try {
            val i= pathOfImage?.let { contentResolver.openInputStream(it) }
            i != null
        }
        catch (e: IOException) {
            e.printStackTrace()
            false
        }
        if (!isExist) {
            // do whatever u want
        }
    }

this solution give exception when file not found and try to openstream.

---

---

Solution-2

In this solution I did save my files into Android\media\com.yourpackge\ directory

private fun isExist(){
        val path = this.externalMediaDirs.first()
        val folder = File(path, getString(R.string.app_name))
        if (!folder.exists()) folder.mkdirs()
        val  file = File(folder, "myimage.png")

        if (!file.exists()) {
            // save your files or do whatever you want

            // use this for show files into gallery
            MediaScannerConnection.scanFile(this, arrayOf(file.absolutePath), null,
                object : MediaScannerConnection.OnScanCompletedListener {
                    override fun onScanCompleted(path: String, uri: Uri?) {
                        Log.e("scann--","Finished scanning $path")
                    }
                })
        }
    }

---

Now I want to move my files from older getExternalStorageDirectory folder to Android\media\com.yourpackge\ directory in android 11 like whatsapp did without asking any permission.

EDIT - 1

I'm able to move my folder to new on using kotlin Utils class

sourcefolder.copyRecursively(newfolder,true)

private fun copyFiles(){
        val path = this.externalMediaDirs.first()
        val folder = File(path, getString(R.string.app_name))
        if (!folder.exists()) folder.mkdirs()
        val sourcefolder = File(Environment.getExternalStorageDirectory().toString() + "/"
                +"Supreme")
        sourcefolder.copyRecursively(folder,true)

    }