Use the Link-OS SDK for Android, which provides a GraphicsUtil class where you can find the printImage() API that converts the image file into bitmap data wrapped around with the CPCL commands and sends to the printer. To print on the ZQ220 printer, you would need to specify the printer language as CPCL when getting the printer instance. Without specifying the printer language as CPCL, the printImage() API would send the data as ZPL to the ZQ220. This wouldn't work, as the ZQ220 is a CPCL printer.

Here is the code snippet

private void sendImage2Printer( String imageFilePath) {
    new Thread(new Runnable() {
        public void run() {
            try {
                Connection connection = new BluetoothConnection(getMacAddressFieldText());
                connection.open();
                ZebraPrinter printer = ZebraPrinterFactory.getInstance(PrinterLanguage.CPCL, connection);
                printer.printImage(imageFilePath, 0, 0, 550, 412, false);

                connection.close();

            } catch (ConnectionException e) {
                // Do something
            } finally {
                // Do something
            }
        }
    }).start();
}

I appreciate your help a lot, it saved me time