App crash when I want to save a file about flutter_file_dialog HOT 10 CLOSED

@cormalenv Yes you have understood it correctly. The API name saveFile may be slightly confusing, maybe it should be renamed e.g. to exportFile. So with this api you can export a file from your app to an user selectable location which user can access (which can be e.g. Downloads folder, Googe Drive etc.). The file to export could be an already existing file in your app data like an image file or you could also create a new file to export in a temporary directory (like a backup zip file or exported data in a CSV file).

from flutter_file_dialog.

Thanks @kinex

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Did you try it in Android or in iOS? What is the log output when it crashes?

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Hi @kinex,

Not sure if this is slightly off topic but I assume SaveFileDialogParams is essentially "copying" as it requires you to have a file in existence in order to provide an valid file path for the method to re-save it elsewhere. Conceptually then to implement true saving in one's app you would create a _file in say Directory.systemTemp and then pass that _file.path as the sourceFilePath.

Thanks for the work.

from flutter_file_dialog.

Hello

I was trying it on an Android Emulator through Android Studio.

First, I encode a file in zip format, and then I tried to save it where the user wants to (Google Drive or Downloads for example).

Here is my code :
` try {
debugPrint('Begin to ZIP file');
var encoder = ZipFileEncoder();
encoder.create(donneesVoiture.path);
//Adding files to archive donneesVoiture
encoder.addFile(fileTableVoiture);
encoder.addFile(fileTableEntretien);
encoder.addFile(fileTableHistoriqueEntretiens);
encoder.addFile(fileTableControleTechnique);
encoder.addFile(fileTableModeOPEntretien);
encoder.close();
debugPrint('zip file created');
debugPrint('FlutterSaveDialog : to choose where to store the zip file "donneesVoiture" via a file explorer');
final params = SaveFileDialogParams(sourceFilePath: donneesVoiture.path);
final filePath = await FlutterFileDialog.saveFile(params: params);
debugPrint(filePath);
print(filePath);

} catch (e) {
  debugPrint('Error while creating ZIP file');
  print(e);
}`

And I got this error :
/FlutterFileDialogPlugin(14505): onMethodCall, method=saveFile D/FileDialog(14505): saveFile - IN, sourceFileName=/storage/emulated/0/Android/data/com.example.carnet_entretien_virtuel/files/DL-749-YE.zip, mimeTypesFilter=null, localOnly=false D/FileDialog(14505): saveFile - OUT E/Surface (14505): getSlotFromBufferLocked: unknown buffer: 0xa1535680 D/EGL_emulation(14505): eglMakeCurrent: 0xab30c220: ver 3 1 (tinfo 0x9f5cb640) E/Surface (14505): getSlotFromBufferLocked: unknown buffer: 0xb40fcd00 D/FlutterView(14505): Detaching from a FlutterEngine: io.flutter.embedding.engine.FlutterEngine@a1df5b2 D/AndroidRuntime(14505): Shutting down VM E/AndroidRuntime(14505): FATAL EXCEPTION: main E/AndroidRuntime(14505): Process: com.example.carnet_entretien_virtuel, PID: 14505 E/AndroidRuntime(14505): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=19112, result=-1, data=Intent { dat=content://com.android.providers.downloads.documents/document/15 flg=0x43 }} to activity {com.example.carnet_entretien_virtuel/com.example.carnet_entretien_virtuel.MainActivity}: kotlin.KotlinNullPointerException E/AndroidRuntime(14505): at android.app.ActivityThread.deliverResults(ActivityThread.java:3699) E/AndroidRuntime(14505): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742) E/AndroidRuntime(14505): at android.app.ActivityThread.-wrap16(ActivityThread.java) E/AndroidRuntime(14505): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393) E/AndroidRuntime(14505): at android.os.Handler.dispatchMessage(Handler.java:102) E/AndroidRuntime(14505): at android.os.Looper.loop(Looper.java:148) E/AndroidRuntime(14505): at android.app.ActivityThread.main(ActivityThread.java:5417) E/AndroidRuntime(14505): at java.lang.reflect.Method.invoke(Native Method) E/AndroidRuntime(14505): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) E/AndroidRuntime(14505): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) E/AndroidRuntime(14505): Caused by: kotlin.KotlinNullPointerException E/AndroidRuntime(14505): at com.kineapps.flutter_file_dialog.FileDialog.onActivityResult(FileDialog.kt:134) E/AndroidRuntime(14505): at io.flutter.embedding.engine.FlutterEnginePluginRegistry$FlutterEngineActivityPluginBinding.onActivityResult(FlutterEnginePluginRegistry.java:634) E/AndroidRuntime(14505): at io.flutter.embedding.engine.FlutterEnginePluginRegistry.onActivityResult(FlutterEnginePluginRegistry.java:367) E/AndroidRuntime(14505): at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onActivityResult(FlutterActivityAndFragmentDelegate.java:546) E/AndroidRuntime(14505): at io.flutter.embedding.android.FlutterActivity.onActivityResult(FlutterActivity.java:594) E/AndroidRuntime(14505): at android.app.Activity.dispatchActivityResult(Activity.java:6428) E/AndroidRuntime(14505): at android.app.ActivityThread.deliverResults(ActivityThread.java:3695) E/AndroidRuntime(14505): ... 9 more I/Process (14505): Sending signal. PID: 14505 SIG: 9 Lost connection to device.

from flutter_file_dialog.

Same result on a real device

from flutter_file_dialog.

Could you please try this with the provided example app. Clone current master and execute flutter run in the example directory. Then pick an image file and try to save it to Google Drive. Does this crash also?

Have you already upgraded your Android project to V2 embedding? See https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects . Not sure if the crash could be related to v1 embedding (although it should work also with v1). Example app has been upgraded to v2 embedding.

from flutter_file_dialog.

Similar result as @deacon78, Example code below. v2 embedding in place

FATAL EXCEPTION: main
Process: com..., PID: 5389
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=19112, result=-1, data=Intent { dat=content://com.android.providers.downloads.documents/document/313 flg=0x43 }} to activity {com.../com....MainActivity}: kotlin.KotlinNullPointerException
	at android.app.ActivityThread.deliverResults(ActivityThread.java:4339)
	at android.app.ActivityThread.handleSendResult(ActivityThread.java:4383)
	at android.app.ActivityThread.-wrap19(Unknown Source:0)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1690)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loop(Looper.java:171)
	at android.app.ActivityThread.main(ActivityThread.java:6627)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:518)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
Caused by: kotlin.KotlinNullPointerException
	at com.kineapps.flutter_file_dialog.FileDialog.onActivityResult(FileDialog.kt:134)
	at io.flutter.embedding.engine.FlutterEnginePluginRegistry$FlutterEngineActivityPluginBinding.onActivityResult(FlutterEnginePluginRegistry.java:634)
	at io.flutter.embedding.engine.FlutterEnginePluginRegistry.onActivityResult(FlutterEnginePluginRegistry.java:367)
	at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onActivityResult(FlutterActivityAndFragmentDelegate.java:546)
	at io.flutter.embedding.android.FlutterActivity.onActivityResult(FlutterActivity.java:594)
	at android.app.Activity.dispatchActivityResult(Activity.java:7343)
	at android.app.ActivityThread.deliverResults(ActivityThread.java:4335)
	... 9 more

import 'package:flutter/material.dart';
import 'dart:io';
import 'package:flutter_file_dialog/flutter_file_dialog.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: SafeArea(
        child: Scaffold(
          body: RaisedButton(
            child: Text('Run'),
            onPressed: () => run(),
          ),
        ),
      ),
    );
  }

  Future<void> run () async {
    File _file = File (Directory.systemTemp.path +  "/test.txt");
    _file.writeAsStringSync('my string contents');
    final params = SaveFileDialogParams(sourceFilePath: _file.path);
    final filePath = await FlutterFileDialog.saveFile(params: params);
  }
}

EDIT: Removing the following from MainActivity.kt resolved the issue although I am unsure of the broader implications of doing so.

    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine);
    }

By the way the github example does work. Its pulling the plugin into new/existing projects that seems to be the issue. If for instance I create a brand new flutter project in Android Studio with v2 Embedding, latest gradle, API29 etc the issue appears. We don't see this with other plugins.

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@cormalenv Thanks for the details. It seems this issue is related to flutter/flutter#48202

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Issue fixed in plugin version 0.0.2

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