saveBitmapToFile

MainActivity.java

public static File saveBitmapToFile(Context context, String filename, Bitmap bitmap) {
        File f = new File(context.getCacheDir(), filename);
        Log.e(TAG, "saveBitmapToFile: " + f.getAbsolutePath());
        try {
            f.createNewFile();
            //Convert bitmap to byte array
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            bitmap.compress(Bitmap.CompressFormat.PNG, 0 /*ignored for PNG*/, bos);
            byte[] bitmapdata = bos.toByteArray();

            //write the bytes in file
            FileOutputStream fos = new FileOutputStream(f);
            fos.write(bitmapdata);
            fos.flush();
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return f;
    }