PrintProxyActivity.java

/*
   Print Proxy Activity
 
   Copyright 2026 Ibrahim Sevinc
 
   This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
   If a copy of the MPL was not distributed with this file, You can obtain one at
   http://mozilla.org/MPL/2.0/.
*/
 
package com.freerdp.freerdpcore.presentation;
 
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.ParcelFileDescriptor;
import android.print.PageRange;
import android.print.PrintAttributes;
import android.print.PrintDocumentAdapter;
import android.print.PrintDocumentInfo;
import android.print.PrintJob;
import android.print.PrintManager;
 
import android.app.Activity;
 
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
 
public class PrintProxyActivity extends Activity
{
  private PrintJob printJob;
  private final Handler handler = new Handler(Looper.getMainLooper());
  private final Runnable pollJob = new Runnable() {
    @Override public void run()
    {
      if (printJob == null || printJob.isCompleted() || printJob.isFailed() ||
          printJob.isCancelled())
      {
        finish();
        return;
      }
      handler.postDelayed(this, 500);
    }
  };
 
  @Override protected void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
 
    Uri uri = getIntent().getData();
    if (uri == null)
    {
      finish();
      return;
    }
 
    PrintManager pm = (PrintManager)getSystemService(Context.PRINT_SERVICE);
    printJob = pm.print(uri.getLastPathSegment(), new PdfAdapter(this, uri), null);
    handler.postDelayed(pollJob, 500);
  }
 
  @Override protected void onDestroy()
  {
    handler.removeCallbacks(pollJob);
    super.onDestroy();
  }
 
  private static class PdfAdapter extends PrintDocumentAdapter
  {
    private final Context ctx;
    private final Uri uri;
 
    PdfAdapter(Context ctx, Uri uri)
    {
      this.ctx = ctx;
      this.uri = uri;
    }
 
    @Override
    public void onLayout(PrintAttributes oldAttr, PrintAttributes newAttr,
                         android.os.CancellationSignal signal, LayoutResultCallback cb,
                         Bundle extras)
    {
      if (signal.isCanceled())
      {
        cb.onLayoutCancelled();
        return;
      }
      PrintDocumentInfo info = new PrintDocumentInfo.Builder(uri.getLastPathSegment())
                                   .setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT)
                                   .setPageCount(PrintDocumentInfo.PAGE_COUNT_UNKNOWN)
                                   .build();
      cb.onLayoutFinished(info, !newAttr.equals(oldAttr));
    }
 
    @Override
    public void onWrite(PageRange[] pages, ParcelFileDescriptor dest,
                        android.os.CancellationSignal signal, WriteResultCallback cb)
    {
      try (InputStream in = ctx.getContentResolver().openInputStream(uri);
           FileOutputStream out = new FileOutputStream(dest.getFileDescriptor()))
      {
        if (in == null)
        {
          cb.onWriteFailed("Cannot open PDF");
          return;
        }
        byte[] buf = new byte[8192];
        int n;
        while ((n = in.read(buf)) != -1)
        {
          if (signal.isCanceled())
          {
            cb.onWriteCancelled();
            return;
          }
          out.write(buf, 0, n);
        }
        cb.onWriteFinished(new PageRange[] { PageRange.ALL_PAGES });
      }
      catch (IOException e)
      {
        cb.onWriteFailed(e.getMessage());
      }
    }
  }
}