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<p align="center"> <img src="https://raw.githubusercontent.com/jhomlala/catcher/master/screenshots/logo.png"> </p>

Catcher

pub package pub package pub package pub package

Catcher is Flutter plugin which automatically catches error/exceptions and handle them. Catcher offers multiple way to handle errors. Catcher is heavily inspired from ACRA: https://github.com/ACRA/acra. Catcher supports Android, iOS, Web, Linux, Windows and MacOS platforms.

Install

Add this line to your pubspec.yaml:

dependencies:
  catcher: ^1.0.0-dev1

Then run this command:

$ flutter packages get

Then add this import:

import 'package:catcher/catcher.dart';

Table of contents

Platform support
Basic example
Catcher usage Adding navigator key
Catcher configuration
Report catched exception
Localization

Report modes

Handlers

Test Exception
Explicit exception report handler map
Explicit exception report mode map
Error widget
Current config
Update config
Screenshots

Platform support

To check which features of Catcher are available in given platform visit this page: Platform support

Basic example

Basic example utilizes debug config with Dialog Report Mode and Console Handler and release config with Dialog Report Mode and Email Manual Handler.

To start using Catcher, you have to:

  1. Create Catcher configuration (you can use only debug config at start)
  2. Create Catcher instance and pass your root widget along with catcher configuration
  3. Add navigator key to MaterialApp or CupertinoApp

Here is complete example:

import 'package:flutter/material.dart';
import 'package:catcher/catcher.dart';

main() {
  /// STEP 1. Create catcher configuration. 
  /// Debug configuration with dialog report mode and console handler. It will show dialog and once user accepts it, error will be shown   /// in console.
  CatcherOptions debugOptions =
      CatcherOptions(DialogReportMode(), [ConsoleHandler()]);
      
  /// Release configuration. Same as above, but once user accepts dialog, user will be prompted to send email with crash to support.
  CatcherOptions releaseOptions = CatcherOptions(DialogReportMode(), [
    EmailManualHandler(["support@email.com"])
  ]);

  /// STEP 2. Pass your root widget (MyApp) along with Catcher configuration:
  Catcher(rootWidget: MyApp(), debugConfig: debugOptions, releaseConfig: releaseOptions);
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      /// STEP 3. Add navigator key from Catcher. It will be used to navigate user to report page or to show dialog.
      navigatorKey: Catcher.navigatorKey,
      home: Scaffold(
          appBar: AppBar(
            title: const Text('Plugin example app'),
          ),
          body: ChildWidget()),
    );
  }
}

class ChildWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
            child: TextButton(
                child: Text("Generate error"),
                onPressed: () => generateError()));
  }

  generateError() async {
    throw "Test exception";
  }
}

If you run this code you will see screen with "Generate error" button on the screen. After clicking on it, it will generate test exception, which will be handled by Catcher. Before Catcher process exception to handler, it will show dialog with information for user. This dialog is shown because we have used DialogReportHandler. Once user confirms action in this dialog, report will be send to console handler which will log to console error informations.

<p align="center"> <img src="https://raw.githubusercontent.com/jhomlala/catcher/master/screenshots/6.png" width="250px"> <br/> <i>Dialog with default confirmation message</i> </p>
I/flutter ( 7457): [2019-02-09 12:40:21.527271 | ConsoleHandler | INFO] ============================== CATCHER LOG ==============================
I/flutter ( 7457): [2019-02-09 12:40:21.527742 | ConsoleHandler | INFO] Crash occured on 2019-02-09 12:40:20.424286
I/flutter ( 7457): [2019-02-09 12:40:21.527827 | ConsoleHandler | INFO] 
I/flutter ( 7457): [2019-02-09 12:40:21.527908 | ConsoleHandler | INFO] ------- DEVICE INFO -------
I/flutter ( 7457): [2019-02-09 12:40:21.528233 | ConsoleHandler | INFO] id: PSR1.180720.061
I/flutter ( 7457): [2019-02-09 12:40:21.528337 | ConsoleHandler | INFO] androidId: 726e4abc58dde277
I/flutter ( 7457): [2019-02-09 12:40:21.528431 | ConsoleHandler | INFO] board: goldfish_x86
I/flutter ( 7457): [2019-02-09 12:40:21.528512 | ConsoleHandler | INFO] bootloader: unknown
I/flutter ( 7457): [2019-02-09 12:40:21.528595 | ConsoleHandler | INFO] brand: google
I/flutter ( 7457): [2019-02-09 12:40:21.528694 | ConsoleHandler | INFO] device: generic_x86
I/flutter ( 7457): [2019-02-09 12:40:21.528774 | ConsoleHandler | INFO] display: sdk_gphone_x86-userdebug 9 PSR1.180720.061 5075414 dev-keys
I/flutter ( 7457): [2019-02-09 12:40:21.528855 | ConsoleHandler | INFO] fingerprint: google/sdk_gphone_x86/generic_x86:9/PSR1.180720.061/5075414:userdebug/dev-keys
I/flutter ( 7457): [2019-02-09 12:40:21.528939 | ConsoleHandler | INFO] hardware: ranchu
I/flutter ( 7457): [2019-02-09 12:40:21.529023 | ConsoleHandler | INFO] host: vped9.mtv.corp.google.com
I/flutter ( 7457): [2019-02-09 12:40:21.529813 | ConsoleHandler | INFO] isPsychicalDevice: false
I/flutter ( 7457): [2019-02-09 12:40:21.530178 | ConsoleHandler | INFO] manufacturer: Google
I/flutter ( 7457): [2019-02-09 12:40:21.530345 | ConsoleHandler | INFO] model: Android SDK built for x86
I/flutter ( 7457): [2019-02-09 12:40:21.530443 | ConsoleHandler | INFO] product: sdk_gphone_x86
I/flutter ( 7457): [2019-02-09 12:40:21.530610 | ConsoleHandler | INFO] tags: dev-keys
I/flutter ( 7457): [2019-02-09 12:40:21.530713 | ConsoleHandler | INFO] type: userdebug
I/flutter ( 7457): [2019-02-09 12:40:21.530825 | ConsoleHandler | INFO] versionBaseOs: 
I/flutter ( 7457): [2019-02-09 12:40:21.530922 | ConsoleHandler | INFO] versionCodename: REL
I/flutter ( 7457): [2019-02-09 12:40:21.531074 | ConsoleHandler | INFO] versionIncremental: 5075414
I/flutter ( 7457): [2019-02-09 12:40:21.531573 | ConsoleHandler | INFO] versionPreviewSdk: 0
I/flutter ( 7457): [2019-02-09 12:40:21.531659 | ConsoleHandler | INFO] versionRelase: 9
I/flutter ( 7457): [2019-02-09 12:40:21.531740 | ConsoleHandler | INFO] versionSdk: 28
I/flutter ( 7457): [2019-02-09 12:40:21.531870 | ConsoleHandler | INFO] versionSecurityPatch: 2018-08-05
I/flutter ( 7457): [2019-02-09 12:40:21.532002 | ConsoleHandler | INFO] 
I/flutter ( 7457): [2019-02-09 12:40:21.532078 | ConsoleHandler | INFO] ------- APP INFO -------
I/flutter ( 7457): [2019-02-09 12:40:21.532167 | ConsoleHandler | INFO] version: 1.0
I/flutter ( 7457): [2019-02-09 12:40:21.532250 | ConsoleHandler | INFO] appName: catcher_example
I/flutter ( 7457): [2019-02-09 12:40:21.532345 | ConsoleHandler | INFO] buildNumber: 1
I/flutter ( 7457): [2019-02-09 12:40:21.532426 | ConsoleHandler | INFO] packageName: com.jhomlala.catcherexample
I/flutter ( 7457): [2019-02-09 12:40:21.532667 | ConsoleHandler | INFO] 
I/flutter ( 7457): [2019-02-09 12:40:21.532944 | ConsoleHandler | INFO] ---------- ERROR ----------
I/flutter ( 7457): [2019-02-09 12:40:21.533096 | ConsoleHandler | INFO] Test exception
I/flutter ( 7457): [2019-02-09 12:40:21.533179 | ConsoleHandler | INFO] 
I/flutter ( 7457): [2019-02-09 12:40:21.533257 | ConsoleHandler | INFO] ------- STACK TRACE -------
I/flutter ( 7457): [2019-02-09 12:40:21.533695 | ConsoleHandler | INFO] #0      ChildWidget.generateError (package:catcher_example/file_example.dart:62:5)
I/flutter ( 7457): [2019-02-09 12:40:21.533799 | ConsoleHandler | INFO] <asynchronous suspension>
I/flutter ( 7457): [2019-02-09 12:40:21.533879 | ConsoleHandler | INFO] #1      ChildWidget.build.<anonymous closure> (package:catcher_example/file_example.dart:53:61)
I/flutter ( 7457): [2019-02-09 12:40:21.534149 | ConsoleHandler | INFO] #2      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:507:14)
I/flutter ( 7457): [2019-02-09 12:40:21.534230 | ConsoleHandler | INFO] #3      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:562:30)
I/flutter ( 7457): [2019-02-09 12:40:21.534321 | ConsoleHandler | INFO] #4      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
I/flutter ( 7457): [2019-02-09 12:40:21.534419 | ConsoleHandler | INFO] #5      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:242:9)
I/flutter ( 7457): [2019-02-09 12:40:21.534524 | ConsoleHandler | INFO] #6      TapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:175:7)
I/flutter ( 7457): [2019-02-09 12:40:21.534608 | ConsoleHandler | INFO] #7      PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:315:9)
I/flutter ( 7457): [2019-02-09 12:40:21.534686 | ConsoleHandler | INFO] #8      PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:73:12)
I/flutter ( 7457): [2019-02-09 12:40:21.534765 | ConsoleHandler | INFO] #9      PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101:11)
I/flutter ( 7457): [2019-02-09 12:40:21.534843 | ConsoleHandler | INFO] #10     _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:180:19)
I/flutter ( 7457): [2019-02-09 12:40:21.534973 | ConsoleHandler | INFO] #11     _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:158:22)
I/flutter ( 7457): [2019-02-09 12:40:21.535052 | ConsoleHandler | INFO] #12     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:138:7)
I/flutter ( 7457): [2019-02-09 12:40:21.535136 | ConsoleHandler | INFO] #13     _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:101:7)
I/flutter ( 7457): [2019-02-09 12:40:21.535216 | ConsoleHandler | INFO] #14     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:85:7)
I/flutter ( 7457): [2019-02-09 12:40:21.535600 | ConsoleHandler | INFO] #15     _rootRunUnary (dart:async/zone.dart:1136:13)
I/flutter ( 7457): [2019-02-09 12:40:21.535753 | ConsoleHandler | INFO] #16     _CustomZone.runUnary (dart:async/zone.dart:1029:19)
I/flutter ( 7457): [2019-02-09 12:40:21.536008 | ConsoleHandler | INFO] #17     _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
I/flutter ( 7457): [2019-02-09 12:40:21.536138 | ConsoleHandler | INFO] #18     _invoke1 (dart:ui/hooks.dart:170:10)
I/flutter ( 7457): [2019-02-09 12:40:21.536271 | ConsoleHandler | INFO] #19     _dispatchPointerDataPacket (dart:ui/hooks.dart:122:5)
I/flutter ( 7457): [2019-02-09 12:40:21.536375 | ConsoleHandler | INFO] 
I/flutter ( 7457): [2019-02-09 12:40:21.536539 | ConsoleHandler | INFO] ======================================================================
<p align="center"> <i>Console handler output</i> </p>

Catcher usage

Adding navigator key

In order to make work Page Report Mode and Dialog Report Mode, you must include navigator key. Catcher plugin exposes key which must be included in your MaterialApp or WidgetApp:

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      //********************************************
      navigatorKey: Catcher.navigatorKey,
      //********************************************
      home: Scaffold(
          appBar: AppBar(
            title: const Text('Plugin example app'),
          ),
          body: ChildWidget()),
    );
  }

You need to provide this key, because Catcher needs context of navigator to show dialogs/pages. There is no need to include this navigator key if you won't use Page/Dialog Report Mode. You can also provide your own navigator key if need to. You can provide it with Catcher constructor (see below). Please check custom navigator key example to see basic example.

Catcher configuration

Catcher instance needs rootWidget or runAppFunction in setup time. Please provide one of it.

main() {
  CatcherOptions debugOptions =
  CatcherOptions(DialogReportMode(), [ConsoleHandler()]);
  CatcherOptions releaseOptions = CatcherOptions(DialogReportMode(), [
    EmailManualHandler(["recipient@email.com"])
  ]);
  CatcherOptions profileOptions = CatcherOptions(
    NotificationReportMode(), [ConsoleHandler(), ToastHandler()],
    handlerTimeout: 10000, customParameters: {"example"c: "example_parameter"},);
  Catcher(rootWidget: MyApp(), debugConfig: debugOptions, releaseConfig: releaseOptions, profileConfig: profileOptions, enableLogger: false, navigatorKey: navigatorKey);
}

CatcherOptions parameters: handlers - list of handlers, which will process report, see handlers to get more information.
handlerTimeout - timeout in milliseconds, this parameter describes max time of handling report by handler.
reportMode - describes how error report will be shown to user, see report modes to get more information.
localizationOptions - translations used by report modes nad report handlers.
explicitExceptionReportModesMap - explicit report modes map which will be used to trigger specific report mode for specific error.
explicitExceptionHandlersMap - Explicit report handler map which will be used to trigger specific report report handler for specific error.
customParameters - map of additional parameters that will be included in report (for example user id or user name).
handleSilentError - should handle silent errors reported, see FlutterErrorDetails.silent for more details.
screenshotsPath - path where screenshots will be saved.
excludedParameters - parameters which will be excluded from report.
filterFunction - function used to filter errors which shouldn't be handled.

Report catched exception

Catcher won't process exceptions catched in try/catch block. You can send exception from try catch block to Catcher:

try {
  ...
} catch (error,stackTrace) {
  Catcher.reportCheckedError(error, stackTrace);
}

Localization

Catcher allows to create localizations for Report modes. To add localization support, you need setup few things:

Add navigatorKey in your MaterialApp:

 navigatorKey: Catcher.navigatorKey,

Add flutter localizations delegates and locales in your MaterialApp:

 localizationsDelegates: [
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
      ],
      supportedLocales: [
        const Locale('en', 'US'),
        const Locale('pl', 'PL'),
      ],

Add localizationOptions in catcherOptions:

CatcherOptions(
...
    localizationOptions: [
        LocalizationOptions("pl", notificationReportModeTitle: "My translation" ...),
        LocalizationOptions("de", notificationReportModeTitle: "My translation" ...),
    ]
)

You can add translate for given parameters:

If you want to override default english texts, just add simply localization options for "en" language.

There are build in support for languages:

LocalizationOptions.buildDefaultEnglishOptions();
LocalizationOptions.buildDefaultChineseOptions();
LocalizationOptions.buildDefaultHindiOptions();
LocalizationOptions.buildDefaultSpanishOptions();
LocalizationOptions.buildDefaultMalayOptions();
LocalizationOptions.buildDefaultRussianOptions();
LocalizationOptions.buildDefaultPortugueseOptions();
LocalizationOptions.buildDefaultFrenchOptions();
LocalizationOptions.buildDefaultPolishOptions();
LocalizationOptions.buildDefaultItalianOptions();
LocalizationOptions.buildDefaultKoreanOptions();
LocalizationOptions.buildDefaultDutchOptions();

Complete Example:

import 'package:flutter/material.dart';
import 'package:catcher/catcher.dart';
import 'package:flutter_localizations/flutter_localizations.dart';

main() {
  CatcherOptions debugOptions = CatcherOptions(DialogReportMode(), [
    ConsoleHandler(),
    HttpHandler(HttpRequestType.post, Uri.parse("https://httpstat.us/200"),
        printLogs: true)
  ], localizationOptions: [
    LocalizationOptions("pl",
        notificationReportModeTitle: "Wystąpił błąd aplikacji",
        notificationReportModeContent:
            "Naciśnij tutaj aby wysłać raport do zespołu wpsarcia",
        dialogReportModeTitle: "Błąd aplikacji",
        dialogReportModeDescription:
            "Wystąpił niespodziewany błąd aplikacji. Raport z błędem jest gotowy do wysłania do zespołu wsparcia. Naciśnij akceptuj aby wysłać raport lub odrzuć aby odrzucić raport.",
        dialogReportModeAccept: "Akceptuj",
        dialogReportModeCancel: "Odrzuć",
        pageReportModeTitle: "Błąd aplikacji",
        pageReportModeDescription:
            "Wystąpił niespodziewany błąd aplikacji. Raport z błędem jest gotowy do wysłania do zespołu wsparcia. Naciśnij akceptuj aby wysłać raport lub odrzuć aby odrzucić raport.",
        pageReportModeAccept: "Akceptuj",
        pageReportModeCancel: "Odrzuć",
        toastHandlerDescription: "Wystąpił błąd:",
    ) 
  ]);
  CatcherOptions releaseOptions = CatcherOptions(NotificationReportMode(), [
    EmailManualHandler(["recipient@email.com"])
  ]);

  Catcher(rootWidget: MyApp(), debugConfig: debugOptions, releaseConfig: releaseOptions);
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      navigatorKey: Catcher.navigatorKey,
      localizationsDelegates: [
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
      ],
      supportedLocales: [
        const Locale('en', 'US'),
        const Locale('pl', 'PL'),
      ],
      home: Scaffold(
          appBar: AppBar(
            title: const Text('Plugin example app'),
          ),
          body: ChildWidget()),
    );
  }
}

class ChildWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
        child: TextButton(
            child: Text("Generate error"), onPressed: () => generateError()));
  }

  generateError() async {
    throw "Test exception";
  }
}

Report modes

Report mode is the process of gathering user permission to handle error. User can accept or deny permission to handle error. There are 4 types of report mode:

Silent Report Mode

Silent Report Mode is default report mode. This report mode doesn't ask user for permission to handle crash logs. It will push logs automatically to handlers.

ReportMode reportMode = SilentReportMode();

Notification Report Mode

Notification Report Mode has been removed because of incompatibility with firebase. Please check local_notifications_example to re-add local notificaitons to your app.

Dialog Report Mode

Dialog Report Mode shows dialog with information about error. Dialog has title, description and 2 buttons: Accept and Cancel. Once user clicks on Accept button, report will be pushed to handlers.

  ReportMode reportMode = DialogReportMode();

See localization options to change default texts.

<p align="center"> <img width="250px" src="https://raw.githubusercontent.com/jhomlala/catcher/master/screenshots/6.png"><br/> <i>Dialog report mode</i> </p>

Page Report Mode

Page Report Mode shows new page with information about error. Page has title, description, stack trace view and 2 buttons: Accept and Cancel. Once user clicks on Accept button, report will be pushed to handlers.

  ReportMode reportMode = PageReportMode(showStackTrace: false);

Page Report Mode can be configured with optional parameters: showStackTrace (optional) - enables/disables stack trace view

See localization options to change default texts.

<p align="center"> <img width="250px" src="https://raw.githubusercontent.com/jhomlala/catcher/master/screenshots/7.png"><br/> <i>Page report mode</i> </p>

Handlers

Handlers are an last point in error processing flow. They are doing specific task with error report, for example logging report to console.

Console Handler

Console Handler is the default and basic handler. It show crash log in console. Console logger allows you to parametrize log output:

ConsoleHandler(
          enableApplicationParameters: true,
          enableDeviceParameters: true,
          enableCustomParameters: true,
          enableStackTrace: true,
          handleWhenRejected: false
          )

I/flutter ( 4820): ------- APP INFO -------
I/flutter ( 4820): version: 1.0
I/flutter ( 4820): appName: catcher_example
I/flutter ( 4820): buildNumber: 1
I/flutter ( 4820): packageName: com.jhomlala.catcherexample
I/flutter ( 4820): 
I/flutter ( 4820): ------- DEVICE INFO -------
I/flutter ( 4820): id: PSR1.180720.061
I/flutter ( 4820): androidId: fd97a76448e87410
I/flutter ( 4820): board: goldfish_x86
I/flutter ( 4820): bootloader: unknown
I/flutter ( 4820): brand: google
I/flutter ( 4820): device: generic_x86
I/flutter ( 4820): display: sdk_gphone_x86-userdebug 9 PSR1.180720.061 5075414 dev-keys
I/flutter ( 4820): fingerprint: google/sdk_gphone_x86/generic_x86:9/PSR1.180720.061/5075414:userdebug/dev-keys
I/flutter ( 4820): hardware: ranchu
I/flutter ( 4820): host: vped9.mtv.corp.google.com
I/flutter ( 4820): isPsychicalDevice: false
I/flutter ( 4820): manufacturer: Google
I/flutter ( 4820): model: Android SDK built for x86
I/flutter ( 4820): product: sdk_gphone_x86
I/flutter ( 4820): tags: dev-keys
I/flutter ( 4820): type: userdebug
I/flutter ( 4820): versionBaseOs: 
I/flutter ( 4820): versionCodename: REL
I/flutter ( 4820): versionIncremental: 5075414
I/flutter ( 4820): versionPreviewSdk: 0
I/flutter ( 4820): versionRelase: 9
I/flutter ( 4820): versionSdk: 28
I/flutter ( 4820): versionSecurityPatch: 2018-08-05
I/flutter ( 5073): ------- STACK TRACE -------
I/flutter ( 5073): #0      _MyAppState.generateError (package:catcher_example/main.dart:38:5)
I/flutter ( 5073): <asynchronous suspension>
I/flutter ( 5073): #1      _MyAppState.build.<anonymous closure> (package:catcher_example/main.dart:31:69)
I/flutter ( 5073): #2      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:507:14)
I/flutter ( 5073): #3      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:562:30)
I/flutter ( 5073): #4      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
I/flutter ( 5073): #5      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:242:9)
I/flutter ( 5073): #6      TapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:175:7)
I/flutter ( 5073): #7      PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:315:9)
I/flutter ( 5073): #8      PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:73:12)
I/flutter ( 5073): #9      PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101:11)
I/flutter ( 5073): #10     _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter

Email Manual Handler

Email manual handler can be used to send email manually by user. It opens default email application with prepared email.

EmailManualHandler(
      ["email1@email.com", "email2@email.com"],
      enableDeviceParameters: true,
      enableStackTrace: true,
      enableCustomParameters: true,
      enableApplicationParameters: true,
      sendHtml: true,
      emailTitle: "Sample Title",
      emailHeader: "Sample Header",
      printLogs: true)

Email Manual Handler parameters:

Email Auto Handler

Email handler can be used to send automatically email with error reports. Email handler has multiple configuration parameters. Few of them are required, other are optional. These parameters are required:

 EmailAutoHandler("smtp.gmail.com", 587, "somefakeemail@gmail.com", "Catcher",
          "FakePassword", ["myemail@gmail.com"])

We need to setup email smtp server, email account and recipient. Currently, only Gmail was tested and worked. You can try use other email providers, but there can be errors.

List of all parameters:

Example email:

<p align="center"> <img src="https://raw.githubusercontent.com/jhomlala/catcher/master/screenshots/3.png"> </p>

Http Handler

Http Handler provides feature for sending report to external server. Data will be encoded in JSON and sent to specified server. Currently only POST request can be send. Minimal example:

HttpHandler(HttpRequestType.post, Uri.parse("http://logs.server.com")

All parameters list:

You can try using example backend server which handles logs. It's written in Java 8 and Spring Framework and uses material design. You can find code of backend server here: https://github.com/jhomlala/catcher/tree/master/backend

<p align="center"> <img src="https://raw.githubusercontent.com/jhomlala/catcher/master/screenshots/4.png"> </p>

Note: Remeber to add Internet permission in Android Manifest:

<uses-permission android:name="android.permission.INTERNET"/>

File Handler

File handler allows to store logs in file. Minimal example:

main() {
  String path = "/storage/emulated/0/log.txt";
  CatcherOptions debugOptions = CatcherOptions(
      DialogReportMode(), [FileHandler(File(path), printLogs: true)]);
  CatcherOptions releaseOptions =
      CatcherOptions(DialogReportMode(), [FileHandler(File(path))]);

  Catcher(rootWidget: MyApp(), debugConfig: debugOptions, releaseConfig: releaseOptions);
}

All parameters list:

Example of logging to file in external directory: https://github.com/jhomlala/catcher/blob/master/example/lib/file_example.dart

If you want to get file path with path_provider lib, you need to call Catcher constructor with ensureInitialized = true. Then you need to pass your catcher config with updateConfig. This is required because WidgetBindings ensureInitialized must be called first before accessing path_provider methods. See example here: https://github.com/jhomlala/catcher/blob/master/example/lib/file_example.dart

Toast Handler

Toast handler allows to show short message in toast. Minimal example:

All parameters list:

<p align="center"> <img src="https://raw.githubusercontent.com/jhomlala/catcher/master/screenshots/5.png" width="250px"> </p>

Sentry Handler

Sentry handler allows to send handled errors to Sentry.io. Before using sentry handler, you need to create your project in Sentry.io page and then copy DSN link. Example:

main() {

  CatcherOptions debugOptions = CatcherOptions(
      DialogReportMode(), [SentryHandler(SentryClient("YOUR_DSN_HERE"))]);
  CatcherOptions releaseOptions = CatcherOptions(NotificationReportMode(), [
    EmailManualHandler(["recipient@email.com"])
  ]);

  Catcher(rootWidget: MyApp(), debugConfig: debugOptions, releaseConfig: releaseOptions);
}

All parameters list:

Slack Handler

Slack Handler allows to send messages to your Slack workspace. You can specify destination of your message and format. You need to register webhook in your workspace to make this handler works: https://api.slack.com/incoming-webhooks.

main() {

 CatcherOptions debugOptions = CatcherOptions(SilentReportMode(), [
     SlackHandler(
         "<web_hook_url>",
         "#catcher",
         username: "CatcherTest",
         iconEmoji: ":thinking_face:",
         enableDeviceParameters: true,
         enableApplicationParameters: true,
         enableCustomParameters: true,
         enableStackTrace: true,
         printLogs: true),
   ]);
   Catcher(rootWidget: MyApp(), debugConfig: debugOptions);
}

All parameters list:

Discord Handler

Discord Handler allows to send messages to your Discord workspace. You need to register webhook in your server to make this handler works: https://support.discordapp.com/hc/en-us/articles/228383668-Intro-to-Webhooks.

main() {
 CatcherOptions debugOptions = CatcherOptions(SilentReportMode(), [
     DiscordHandler(
         "<web_hook_url>",
         enableDeviceParameters: true,
         enableApplicationParameters: true,
         enableCustomParameters: true,
         enableStackTrace: true,
         printLogs: true),
   ]);

   Catcher(rootWidget: MyApp(), debugConfig: debugOptions);
}

All parameters list:

Snackbar Handler

Snackbar handler allows to show customized snackbar message.

void main() {
  CatcherOptions debugOptions = CatcherOptions(DialogReportMode(), [
    SnackbarHandler(
      Duration(seconds: 5),
      backgroundColor: Colors.green,
      elevation: 2,
      margin: EdgeInsets.all(16),
      padding: EdgeInsets.all(16),
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
      behavior: SnackBarBehavior.floating,
      action: SnackBarAction(
          label: "Button",
          onPressed: () {
            print("Click!");
          }),
      textStyle: TextStyle(
        color: Colors.white,
        fontSize: 16,
      ),
    ),
  ]);

  Catcher(
    runAppFunction: () {
      runApp(MyApp());
    },
    debugConfig: debugOptions,
  );
}

All parameters list:

Crashlytics Handler

Crashlytics handler has been removed from core package. You can re-enable it in your project by using custom report mode presented in crashlytics_example in example project.

Explicit exception report handler map

Explicit exception report handler map allows you to setup report handler for specific exception. For example if you want to setup Console Handler for FormatException, you can write:

var explicitMap = {"FormatException": ConsoleHandler()};
CatcherOptions debugOptions = CatcherOptions(
      DialogReportMode(),
      [
        ConsoleHandler(),
        HttpHandler(HttpRequestType.post, Uri.parse("https://httpstat.us/200"),
            printLogs: true)
      ],
      explicitExceptionHandlersMap: explicitMap);

Now if FormatException will be catched, then Console Handler will be used. Warning: if you setup explicit exception map for specific exception, then only this handler will be used for this exception!

Explicit exception report mode map

Same as explicit report handler map, but it's for report mode. Let's say you want to use specific report mode for some exception:

 var explicitReportModesMap = {"FormatException": NotificationReportMode()};
  CatcherOptions debugOptions = CatcherOptions(
      DialogReportMode(),
      [
        ConsoleHandler(),
        HttpHandler(HttpRequestType.post, Uri.parse("https://httpstat.us/200"),
            printLogs: true)
      ],
      explicitExceptionReportModesMap: explicitReportModesMap,);

When FormatException will be catched, then NotificationReportMode will be used. For other exceptions, Catcher will use DialogReportMode.

Error widget

You can add error widget which will replace red screen of death. To add this into your app, see code below:

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      navigatorKey: Catcher.navigatorKey,
      //********************************************
      builder: (BuildContext context, Widget widget) {
        Catcher.addDefaultErrorWidget(
            showStacktrace: true,
            title: "Custom error title",
            description: "Custom error description",
            maxWidthForSmallMode: 150);
        return widget;
      },
      //********************************************
      home: Scaffold(
          appBar: AppBar(
            title: const Text('Plugin example app'),
          ),
          body: ChildWidget()),
    );
  }

You need to add in your MaterialApp or CupertinoApp builder method with Catcher.addDefaultErrorWidget(). This will add error handler for each widget in your app.

You can provide optional parameters:

Error widget will replace your widget if he fails to render. If width of widget is less than maxWidthForSmallMode then "small" mode will be enabled, which will show only error icon

<p align="center"> <table> <tr> <td>With error widget</td><td>Without error widget</td> </tr> <tr> <td><img src="https://raw.githubusercontent.com/jhomlala/catcher/master/screenshots/8.png" width="250px"></td><td><img src="https://raw.githubusercontent.com/jhomlala/catcher/master/screenshots/9.png" width="250px"></td> </tr> </table> </p>

Current config

You can get currently used config by using:

CatcherOptions options = catcher.getCurrentConfig();

This can be used for example to change custom parameters in runtime.

Test exception

Send test exception:

Catcher.sendTestException();

Update config

You can update Catcher config during runtime:

///Catcher instance initialized
Catcher catcher;
catcher.updateConfig(
     debugConfig: CatcherOptions(
       PageReportMode(),
       [ConsoleHandler()],
     ),
   );

Screenshots

Catcher can create screenshots automatically and include them in report handlers. To add screenshot support in your app, simply wrap your root widget with CatcherScreenshot widget:

MaterialApp(
      navigatorKey: Catcher.navigatorKey,
      home: CatcherScreenshot(
        catcher: Catcher.getInstance(),
        child: Scaffold(
          appBar: AppBar(
            title: const Text('Plugin example app'),
          ),
          body: ChildWidget(),
        ),
      ),
    );

Also you need to provide directory path, where Catcher will store screenshot files:

  CatcherOptions debugOptions = CatcherOptions(
    DialogReportMode(),
    [
      ToastHandler(),
    ],
    screenshotsPath: path,
  );

Screenshots will work for all platforms, except Web. Screenshots will work in: