How to Print Unsupported Character Sets with a POS Printer

The font of the printer only support ISO8859-1 and GBK character set.

But you can still print other language by using HTML content printing.

Please add WebView.enableSlowWholeDocumentDraw() in your APP source code, because we use android WebView to print html content.

Permission

The app declares the android.permission.SYSTEM_ALERT_WINDOW in the manifest. This is required by printHTML utility to use a hidden HTML rendering window.

By JNI API

API Overview

PrintHtmlInterface.printHTML

void printHTML(Context context, String htmlcontent, PrinterHtmlListener listener);

Print HTML content.

Returns
context	Context : The activity or application context of the APP, Not null.
htmlcontent	String : The html content, Not null.
listener	PrinterHtmlListener : the callback listener to process the print result, Not null.

PrintHtmlInterface.convert2Image

void convert2Image(Context context, String htmlContent, PrinterHtmlListener listener);

Convert the html content to a image, if want print, please call print API of the printer.

Returns
context	Context : The activity or application context of the APP, Not null.
htmlcontent	String : The html content, Not null.
listener	PrinterHtmlListener : the callback listener to process the print result, Not null.

PrinterHtmlListener.onGet

void onGet(Bitmap returbitmap, int result);

Get returned bitmap.

Returns
returbitmap	Bitmap : The returned bitmap.
result	int: The result of get image, "2:" BITMAP_ERROR, "3:" BITMAP_SUCCESS.

PrinterHtmlListener.onFinishPrinting

void onFinishPrinting(int result);

Return after print.

Returns
result	int : The result of the print,"0:" PRINT_ERROR, "1:" PRINT_SUCCESS,"2:" BITMAP_ERROR, "3:" BITMAP_SUCCESS,"4:" DEVICE_NOT_OPEN.

Sample

Please find the sample in SDK folder, apidemo

By Java API

Please refer to java API Spec. in APIDemoForAar from SDK folder \cloudpos_SDK\device\apidemo\, there is a printHtml method in com.wizarpos.apidemo.action.PrinterAction.java, you can call it like this.