Android: implemented PlatformPrintJobController.onComplete

flutter_inappwebview_android/android/src/main/java/com/pichillilorenzo/flutter_inappwebview_android/print_job/PrintJobChannelDelegate.java

@@ -62,6 +62,10 @@ public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result
     }
   }
 
+  public void onComplete() {
+    getChannel().invokeMethod("onComplete", null);
+  }
+
   @Override
   public void dispose() {
     super.dispose();

flutter_inappwebview_android/android/src/main/java/com/pichillilorenzo/flutter_inappwebview_android/print_job/PrintJobController.java

@@ -28,16 +28,19 @@ public class PrintJobController implements Disposable  {
   @Nullable
   public PrintJobSettings settings;
 
-  public PrintJobController(@NonNull String id, @NonNull android.print.PrintJob job,
-                            @Nullable PrintJobSettings settings, @NonNull InAppWebViewFlutterPlugin plugin) {
+  public PrintJobController(@NonNull String id, @Nullable PrintJobSettings settings,
+                            @NonNull InAppWebViewFlutterPlugin plugin) {
     this.id = id;
     this.plugin = plugin;
-    this.job = job;
     this.settings = settings;
     final MethodChannel channel = new MethodChannel(plugin.messenger, METHOD_CHANNEL_NAME_PREFIX + id);
     this.channelDelegate = new PrintJobChannelDelegate(this, channel);
   }
-
+
+  public void setJob(@Nullable android.print.PrintJob job) {
+    this.job = job;
+  }
+
   public void cancel() {
     if (this.job != null) {
       this.job.cancel();
@@ -93,4 +96,8 @@ public void dispose() {
     }
     plugin = null;
   }
+
+  public void onComplete() {
+    if (channelDelegate != null) channelDelegate.onComplete();
+  }
 }

flutter_inappwebview_android/android/src/main/java/com/pichillilorenzo/flutter_inappwebview_android/webview/in_app_webview/InAppWebView.java

@@ -17,9 +17,12 @@
 import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
+import android.os.CancellationSignal;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
+import android.os.ParcelFileDescriptor;
+import android.print.PageRange;
 import android.print.PrintAttributes;
 import android.print.PrintDocumentAdapter;
 import android.print.PrintManager;
@@ -1403,6 +1406,37 @@ public void setDesktopMode(final boolean enabled) {
     webSettings.setBuiltInZoomControls(enabled);
   }
 
+  interface PrintDocumentAdapterWrapperCallback {
+    void onFinish();
+  }
+
+  @RequiresApi(api = Build.VERSION_CODES.KITKAT)
+  class PrintDocumentAdapterWrapper extends PrintDocumentAdapter {
+    @NonNull PrintDocumentAdapter delegate;
+    @Nullable PrintDocumentAdapterWrapperCallback callback;
+
+    PrintDocumentAdapterWrapper(@NonNull PrintDocumentAdapter delegate, @Nullable PrintDocumentAdapterWrapperCallback callback) {
+      this.delegate = delegate;
+      this.callback = callback;
+    }
+
+    @Override
+    public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle extras) {
+      this.delegate.onLayout(oldAttributes, newAttributes, cancellationSignal, callback, extras);
+    }
+
+    @Override
+    public void onWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback) {
+      this.delegate.onWrite(pages, destination, cancellationSignal, callback);
+    }
+
+    @Override
+    public void onFinish() {
+      this.delegate.onFinish();
+      if (this.callback != null) this.callback.onFinish();
+    }
+  }
+
   @RequiresApi(api = Build.VERSION_CODES.KITKAT)
   @Nullable
   public String printCurrentPage(@Nullable PrintJobSettings settings) {
@@ -1458,15 +1492,21 @@ public String printCurrentPage(@Nullable PrintJobSettings settings) {
           printAdapter = createPrintDocumentAdapter();
         }
 
-        // Create a printCurrentPage job with name and adapter instance
-        android.print.PrintJob job = printManager.print(jobName, printAdapter, builder.build());
+        PrintJobController printJobController = null;
+        String id = null;
 
         if (settings != null && settings.handledByClient && plugin.printJobManager != null) {
-          String id = UUID.randomUUID().toString();
-          PrintJobController printJobController = new PrintJobController(id, job, settings, plugin);
+          id = UUID.randomUUID().toString();
+          printJobController = new PrintJobController(id, settings, plugin);
           plugin.printJobManager.jobs.put(printJobController.id, printJobController);
-          return id;
+          printAdapter = new PrintDocumentAdapterWrapper(printAdapter, printJobController::onComplete);
         }
+
+        // Create a printCurrentPage job with name and adapter instance
+        android.print.PrintJob job = printManager.print(jobName, printAdapter, builder.build());
+        if (printJobController != null) printJobController.setJob(job);
+
+        return id;
       } else {
         Log.e(LOG_TAG, "No PrintManager available");
       }

flutter_inappwebview_android/lib/src/print_job/print_job_controller.dart

@@ -43,6 +43,9 @@ class AndroidPrintJobController extends PlatformPrintJobController
 
   Future<dynamic> _handleMethod(MethodCall call) async {
     switch (call.method) {
+      case "onComplete":
+          onComplete?.call(true, null);
+        break;
       default:
         throw UnimplementedError("Unimplemented ${call.method} method");
     }

flutter_inappwebview_platform_interface/lib/src/print_job/platform_print_job_controller.dart

@@ -73,6 +73,7 @@ abstract class PlatformPrintJobController extends PlatformInterface
   ///A completion handler used to handle the conclusion of the print job (for instance, to reset state) and to handle any errors encountered in printing.
   ///
   ///**Officially Supported Platforms/Implementations**:
+  ///- Android ([Official API - PrintDocumentAdapter.onFinish](https://developer.android.com/reference/android/print/PrintDocumentAdapter#onFinish()))
   ///- iOS ([Official API - UIPrintInteractionController.CompletionHandler](https://developer.apple.com/documentation/uikit/uiprintinteractioncontroller/completionhandler))
   ///- MacOS ([Official API - NSPrintOperation.runModal](https://developer.apple.com/documentation/appkit/nsprintoperation/1532065-runmodal))
   ///{@endtemplate}