java - Android 直接打印到网络打印机？

Question

Hii 在我的应用程序中，我想将我的数据从我的 Android 手机直接发送到我的网络打印机以进行打印。我怎样才能做到这一点？

我还想提供布局、份数、页面范围等规范。如何直接从我的 Android 手机检测我的打印机并发出打印命令？

Answer 1

您只需将您的文件提交到谷歌云打印。这是我用来打印的代码。文档保存在外部存储中，格式为pdf。唯一的要求是设备和无线打印机必须在同一网络中。如果打印机是有线的，则连接到打印机的安卓设备和系统必须使用相同的谷歌帐户登录。

PrintManager printManager = (PrintManager) Order_Bag.this.getSystemService(Context.PRINT_SERVICE);
String jobName = Order_Bag.this.getString(R.string.app_name) + " Document";
//printManager.print(jobName, pda, null);
pda = new PrintDocumentAdapter(){

    @Override
    public void onWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback){
        InputStream input = null;
        OutputStream output = null;

        try {

            input = new FileInputStream(Environment.getExternalStorageDirectory() + "/hello.pdf");
            output = new FileOutputStream(destination.getFileDescriptor());

            byte[] buf = new byte[1024];
            int bytesRead;

            while ((bytesRead = input.read(buf)) > 0) {
                output.write(buf, 0, bytesRead);
            }

            callback.onWriteFinished(new PageRange[]{PageRange.ALL_PAGES});

        } catch (FileNotFoundException ee){
            //Catch exception
        } catch (Exception e) {
            //Catch exception
        } finally {
            try {
                input.close();
                output.close();

            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle extras){

        if (cancellationSignal.isCanceled()) {
            callback.onLayoutCancelled();
            return;
        }

        //    int pages = computePageCount(newAttributes);

        PrintDocumentInfo pdi = new PrintDocumentInfo.Builder("The invoice").setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT).build();

        callback.onLayoutFinished(pdi, true);
    }
};

printManager.print(jobName, pda, null);