使用Delphi从Android设备打印报告

Question

I am developing an app using Delphi XE8 and I need to print a report.

The report has more pages so I can't create a simple image and share it.

The idea is to use the FMX.Printer.

But the TPrintDialog works only on Windows not on Android. How can I select a printer from the Cloud Print list?

Do you have any suggestions?

Thanks

Answer 1

If the official Google Cloud Print app is installed on the device, then you should be able to access it with an Intent as described in the answer to this question: Print Intent for Google Cloud Print App

Intent printIntent = new Intent(Intent.ACTION_SEND);
printIntent.setType("text/html");
printIntent.putExtra(Intent.EXTRA_TITLE, "some cool title for your document");
printIntent.putExtra(Intent.EXTRA_STREAM, uri);

startActivity(printIntent);

I guess that Android then will show a dialog with the available options, including the Cloud Print printers.

Google Cloud Print documentation: https://developers.google.com/cloud-print/docs/android

API to retrieve the printer list: https://developers.google.com/cloud-print/docs/proxyinterfaces#list

Answer 2

Putting this into Delphi should look something like:

uses
...
  FMX.Platform.Android,
  Androidapi.Helpers,
  Androidapi.JNI.GraphicsContentViewText,
  Androidapi.JNI.Embarcadero,
...

var
  printIntent: JIntent;
begin
  printIntent := TJIntent.Create;
  printIntent.setAction(TJIntent.JavaClass.ACTION_SEND);
  printIntent.setType(StringToJString('text/html'));
  printIntent.putExtra(TJIntent.JavaClass.EXTRA_TITLE, StringToJString('Testing print from Android'));
  printIntent.putExtra(TJIntent.JavaClass.EXTRA_STREAM, StringToJString(uri));
  if MainActivity.getPackageManager.queryIntentActivities(printIntent, TJPackageManager.JavaClass.MATCH_DEFAULT_ONLY).size > 0 then //Checks if there is at least one application capable of receiving the intent.
    MainActivity.startActivity(printIntent) //Calls startActivity() to send the intent to the system.
  else
    ShowMessage('Receiver not found');

Based on the sample code from http://docwiki.embarcadero.com/CodeExamples/Seattle/en/FMX.Android_Intents_Sample