create image file in internal application cache directory and returns the newly created file uri

Uri.java

    private String saveImageByUri(Uri uri) {
        File parent = new File(getCacheDir(), "temp_images");
        try {
            final InputStream inputStream = getContentResolver().openInputStream(uri);
            if (inputStream == null)
                return "";
            final BufferedSource source = Okio.buffer(Okio.source(inputStream));
          //create file named with same format temp24734194048114480959349.png 
            final File file = File.createTempFile(String.format(Locale.ENGLISH, "temp%d", SystemClock.currentThreadTimeMillis()), ".png", parent);
            final Sink sink = Okio.sink(file);
            source.readAll(sink);
            sink.flush();
            sink.close();
            return file.getPath();
        } catch (java.io.IOException e) {
            e.printStackTrace();
            return "";
        }
    }