在android端用java语言实现打印程序端子功能

要在Android端使用Java语言实现打印程序，你需要使用Android SDK提供的API来与打印机进行通信。以下是一个简单的打印程序的例子：

1. 首先，你需要在AndroidManifest.xml文件中声明必要的权限，例如：

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

2. 然后，你需要使用Android SDK提供的PrinterDiscoverySession和PrintDocumentAdapter类来实现打印功能。以下是一个简单的例子：

public class MyPrintDocumentAdapter extends PrintDocumentAdapter {

    private Context mContext;
    private String mFilePath;

    public MyPrintDocumentAdapter(Context context, String filePath) {
        mContext = context;
        mFilePath = filePath;
    }

    @Override
    public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle extras) {
        if (cancellationSignal.isCanceled()) {
            callback.onLayoutCancelled();
            return;
        }
        PrintDocumentInfo info = new PrintDocumentInfo.Builder("document name")
                .setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT)
                .build();
        callback.onLayoutFinished(info, true);
    }

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

        try {
            input = new FileInputStream(mFilePath);
            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 e) {
            callback.onWriteFailed(e.toString());
            e.printStackTrace();
        } catch (Exception e) {
            callback.onWriteFailed(e.toString());
            e.printStackTrace();
        } finally {
            try {
                input.close();
                output.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

3. 最后，你需要在Activity中调用PrintManager的print方法来实现打印功能。以下是一个简单的例子：

PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE);
String jobName = "Print Job";

printManager.print(jobName, new MyPrintDocumentAdapter(this, filePath), null);

注意，以上代码仅仅是一个简单的例子，实际情况可能更加复杂。你需要根据实际情况进行修改和适配。