是否可以使用打印API在Android中对多个打印作业进行排队？

到目前为止，我能够打印存储在外部存储器上的单个PDF文档。但我想为多个文档提供打印命令。（打印作业排队）

第一个问题是

是否可以在不显示每个文档的对话框的情况下对所有文档的打印进行排队

如果是，如何进行

提前谢谢

这是我迄今为止尝试过的代码

import android.content.Context;
import android.os.Bundle;
import android.os.CancellationSignal;
import android.os.ParcelFileDescriptor;
import android.print.PageRange;
import android.print.PrintAttributes;
import android.print.PrintDocumentAdapter;
import android.print.PrintDocumentInfo;
import android.widget.Toast;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;


public class PDFPrintDocumentAdapter extends PrintDocumentAdapter {

      private Context context;
      private String filePath;
      private String fileName;

/**
 * @param context
 * @param fileName - for Print Document Info
 * @param filePath - PDF file to be printed, stored in external storage
 */
public PDFPrintDocumentAdapter(Context context, String fileName, String filePath) {

    this.context = context;
    this.fileName = fileName;
    this.filePath = filePath;

}

@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(fileName).setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT).build();

    callback.onLayoutFinished(pdi, true);
}

@Override
public void onWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback) {

    InputStream input = null;
    OutputStream output = null;

    try {

        input = new FileInputStream(filePath);
        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 {
            if (null != input) {
                input.close();
            }
            if (null != output) {
                output.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}


@Override
public void onFinish() {
    super.onFinish();

    Toast.makeText(context, "Printing is completed", Toast.LENGTH_SHORT).show();
}



}