来自pdfview的android打印

import android.print.PrintAttributes;
import android.print.PrintDocumentAdapter;
import android.print.PrintManager;
import android.content.Context;
import com.github.barteksc.pdfviewer.PDFView;

public class PrintHelper {
    public static void printPDF(Context context, PDFView pdfView) {
        PrintManager printManager = (PrintManager) context.getSystemService(Context.PRINT_SERVICE);
        String jobName = context.getString(R.string.app_name) + " Document Printing";
        PrintDocumentAdapter printAdapter = new PDFPrintDocumentAdapter(pdfView);

        printManager.print(jobName, printAdapter, new PrintAttributes.Builder().build());
    }
}

class PDFPrintDocumentAdapter extends PrintDocumentAdapter {
    private PDFView pdfView;

    public PDFPrintDocumentAdapter(PDFView pdfView) {
        this.pdfView = pdfView;
    }

    @Override
    public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle extras) {
        if (cancellationSignal.isCanceled()) {
            callback.onLayoutCancelled();
            return;
        }

        PrintDocumentInfo pdi = new PrintDocumentInfo.Builder("document.pdf").build();
        callback.onLayoutFinished(pdi, true);
    }

    @Override
    public void onWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback) {
        try {
            pdfView.saveToStream(new OutputStreamWriter(new FileOutputStream(destination.getFileDescriptor())), new OnSaveListener() {
                @Override
                public void onSave(byte[] data) {
                    callback.onWriteFinished(pages);
                }
            });
        } catch (Exception e) {
            callback.onWriteFailed(e.toString());
        }
    }
}