After Add import 'package:toast/toast.dart'; this line into my main.dart file, not run to my app and show this error message..Please give me a solution how to solve it..

Error message : Target of URI doesn't exist: 'package:toast/toast.dart'. Try creating the file referenced by the URI, or Try using a URI for a file that does exist.

WillPopScope( // onWillPop: () async{ Toast.show("test",context); } )

E/flutter ( 2193): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: NoSuchMethodError: The method 'insert' was called on null. E/flutter ( 2193): Receiver: null E/flutter ( 2193): Tried calling: insert(Instance of 'OverlayEntry') E/flutter ( 2193): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:50:5) E/flutter ( 2193): #1 ToastView.createView (package:toast/toast.dart:67:18) E/flutter ( 2193): E/flutter ( 2193): #2 Toast.show (package:toast/toast.dart:19:15) E/flutter ( 2193): #3 AppState.build. (package:mama_call/main.dart:145:25) E/flutter ( 2193): #4 _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:49:6) E/flutter ( 2193): #5 AppState.build. (package:mama_call/main.dart:141:26) E/flutter ( 2193): #6 ModalRoute.willPop (package:flutter/src/widgets/routes.dart:1083:26) E/flutter ( 2193): #7 _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:49:6) E/flutter ( 2193): #8 ModalRoute.willPop (package:flutter/src/widgets/routes.dart:1079:38) E/flutter ( 2193): #9 NavigatorState.maybePop (package:flutter/src/widgets/navigator.dart:2004:57) E/flutter ( 2193): #10 _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:49:6) E/flutter ( 2193): #11 NavigatorState.maybePop (package:flutter/src/widgets/navigator.dart:2001:42) E/flutter ( 2193): #12 _WidgetsAppState.didPopRoute (package:flutter/src/widgets/app.dart:808:28) E/flutter ( 2193): #13 _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:49:6) E/flutter ( 2193): #14 _WidgetsAppState.didPopRoute (package:flutter/src/widgets/app.dart:803:27) E/flutter ( 2193): #15 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.handlePopRoute (package:flutter/src/widgets/binding.dart:482:26) E/flutter ( 2193): #16 _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:49:6) E/flutter ( 2193): #17 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.handlePopRoute (package:flutter/src/widgets/binding.dart:480:30) E/flutter ( 2193): #18 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding._handleNavigationInvocation (package:flutter/src/widgets/binding.dart:510:16) E/flutter ( 2193): #19 MethodChannel._handleAsMethodCall (package:flutter/src/services/platform_channel.dart:397:55) E/flutter ( 2193): #20 _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:49:6) E/flutter ( 2193): #21 MethodChannel._handleAsMethodCall (package:flutter/src/services/platform_channel.dart:394:39) E/flutter ( 2193): #22 MethodChannel.setMethodCallHandler. (package:flutter/src/services/platform_channel.dart:365:54) E/flutter ( 2193): #23 _DefaultBinaryMessenger.handlePlatformMessage (package:flutter/src/services/binary_messenger.dart:110:33) E/flutter ( 2193): #24 _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:49:6) E/flutter ( 2193): #25 _DefaultBinaryMessenger.handlePlatformMessage (package:flutter/src/services/binary_messenger.dart:101:37) E/flutter ( 2193): #26 _invoke3. (dart:ui/hooks.dart:280:15) E/flutter ( 2193): #27 _rootRun (dart:async/zone.dart:1124:13) E/flutter ( 2193): #28 _CustomZone.run (dart:async/zone.dart:1021:19) E/flutter ( 2193): #29 _CustomZone.runGuarded (dart:async/zone.dart:923:7) E/flutter ( 2193): #30 _invoke3 (dart:ui/hooks.dart:279:10) E/flutter ( 2193): #31 _dispatchPlatformMessage (dart:ui/hooks.dart:141:5)

`Failed to build iOS app Error output from Xcode build: ↳ ** BUILD FAILED **

Xcode's output: ↳ The “Swift Language Version” (SWIFT_VERSION) build setting must be set to a supported value for targets which use Swift. Supported values are: 3.0, 4.0, 4.2. This setting can be set in the build settings editor.`

when ues androidx ,import this lib build failed with error info :

/Users/Carl/dev_soft/flutter/.pub-cache/hosted/pub.flutter-io.cn/fluttertoast-2.2.11/android/src/main/java/io/github/ponnamkarthik/toast/fluttertoast/FluttertoastPlugin.java:14: 错误: 程序包android.support.v4.content不存在
import android.support.v4.content.ContextCompat;
                                 ^
/Users/Carl/dev_soft/flutter/.pub-cache/hosted/pub.flutter-io.cn/fluttertoast-2.2.11/android/src/main/java/io/github/ponnamkarthik/toast/fluttertoast/FluttertoastPlugin.java:107: 错误: 找不到符号
          Drawable shapeDrawable = ContextCompat.getDrawable(ctx, R.drawable.toast_bg);
                                   ^
  符号:   变量 ContextCompat
  位置: 类 FluttertoastPlugin
2 个错误

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':fluttertoast:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 15s
Running Gradle task 'assembleDebug'...
Running Gradle task 'assembleDebug'... Done                        15.9s
The built failed likely due to AndroidX incompatibilities in a plugin. The tool
is about to try using Jetfier to solve the incompatibility.

这里提出一个简单的优化方案,实测有效: 在Material外层包裹一个IgnorePointer即可. @override Widget build(BuildContext context) { return new Positioned( top: gravity == 2 ? 50 : null, bottom: gravity == 0 ? 50 : null, child: IgnorePointer( child: Material( color: Colors.transparent, child: widget, ) )); }

兄弟，使用过程报了这个错，请问有解决方案吗：

Exception has occurred. FlutterError (Looking up a deactivated widget's ancestor is unsafe. At this point the state of the widget's element tree is no longer stable. To safely refer to a widget's ancestor in its dispose() method, save a reference to the ancestor by calling inheritFromWidgetOfExactType() in the widget's didChangeDependencies() method. )

Hi there! Thanks for this awesome Flutter plugin. I am actually facing an issue while using it, when I am using Toast.Bottom as gravity value the Keyboard hide the Toast when it is active. can you make the Toast move just above it. I am actually using the center mode but it is not what I initially wanted. Thanks

Hi, I got this error after running this line: Toast.show("Toast plugin app", duration: Toast.LENGTH_SHORT, gravity: Toast.BOTTOM);

flutter/.pub-cache/hosted/pub.dartlang.org/toast-0.0.6/ios/Classes/ToastReference.swift:325:37: error: 'init(style:)' has been renamed to 'init(activityIndicatorStyle:)' let activityIndicatorView = UIActivityIndicatorView(style: .whiteLarge) ^ ~~~~~ activityIndicatorStyle UIKit.UIActivityIndicatorView:6:12: note: 'init(style:)' was introduced in Swift 4.2 public init(style: UIActivityIndicatorViewStyle) ^ /Users/rlecheta/Dev/flutter/.pub-cache/hosted/pub.dartlang.org/toast-0.0.6/ios/Classes/ToastReference.swift:354:47: error: 'common' has been renamed to 'RunLoopMode.commonModes' RunLoop.main.add(timer, forMode: .common) ^~~~~~ RunLoopMode.commonModes Foundation.RunLoop.Mode:9:23: note: 'common' was introduced in Swift 4.2 public static let common: RunLoopMode ^ /Users/rlecheta/Dev/flutter/.pub-cache/hosted/pub.dartlang.org/toast-0.0.6/ios/Classes/ToastReference.swift:354:47: error: 'common' has been renamed to 'RunLoopMode.commonModes' RunLoop.main.add(timer, forMode: .common) ^~~~~~ RunLoopMode.commonModes Foundation.RunLoop.Mode:9:23: note: 'common' was introduced in Swift 4.2 public static let common: RunLoopMode

package com.android.activity;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.widget.ImageView;
import android.widget.TextView;

import com.android.fragment.MenuFragment;
//import com.special.ResideMenu.ResideMenu;
//import com.special.ResideMenu.ResideMenuInfo;
//import com.special.ResideMenu.ResideMenuItem;

public class MainActivity extends FragmentActivity {

    public Fragment mContent;
    public TextView maintitle;
    public ImageView logo;

    private MenuFragment fragment;

    MyApplication myApp;

    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        maintitle = (TextView) findViewById(R.id.main_txt);
        logo = (ImageView) findViewById(R.id.logo);

        myApp = (MyApplication) getApplication();

        // changeFragment(new HuDongFragment());
        initView();// 初始化页面信息
    }


    // 监听手机上的BACK键
    //public boolean onKeyDown(int keyCode, KeyEvent event) {
    //    if (keyCode == KeyEvent.KEYCODE_BACK) {
    //        // 判断菜单是否关闭
    //        if (is_closed) {
    //            // 判断两次点击的时间间隔（默认设置为2秒）ime) > 2000) {
    //                Toast.makeText(this, "再按一次退出程
    //            if ((System.currentTimeMillis() - mExitT序", Toast.LENGTH_SHORT).show();

    //                mExitTime = System.currentTimeMillis();
    //            } else {
    //                finish();
    //                System.exit(0);
    //                super.onBackPressed();
    //            }
    //        } else {
    //            resideMenu.closeMenu();
    //        }
    //        return true;
    //    }
    //    return super.onKeyDown(keyCode, event);
    //}

    private void initView() {

        maintitle.setText("今日签到");
        fragment =  new MenuFragment();
        mContent = fragment;

        // 显示主页面
        getSupportFragmentManager().beginTransaction()
                .replace(R.id.content_frame, mContent).commit();

    }

    public void switchContent(Fragment fragment) {
        fragment.getClass().getSimpleName() == fragment.getClass().getSimpleName()

        mContent = fragment;

        getSupportFragmentManager().beginTransaction()
                .replace(R.id.content_frame, fragment).commit();

    }

    @Override
    public void onBackPressed() {
        switchContent(fragment);
        //  super.onBackPressed();
    }
}


In my humble opinion we should give more opportunity to customize Toast. Adding textStyle parameter to show method make our toast message more usable.

Beginners would find it confusing that the example given didn't work out of the box and they wouldn't know how to debug it. Overall, good job! I found the package useful. No frills, no unnecessary bloats.

If I show a first toast for 5 seconds, then after 4 seconds show a second toast, then the second message gets shown only one second. Seems like there are two ways one could fix that:

• Using a Timer instead of Future.delayed. Timers can be canceled. https://api.dart.dev/stable/2.3.1/dart-async/Timer/cancel.html
• Wrapping the Future.delayed with a CancelableOperation. https://pub.dev/documentation/async/latest/async/CancelableOperation-class.html

[PROBLEM]

The official demo will throw the error Unhandled Exception: Null check operator used on a null value when showing toast.

see: Issue#29

[REASON]

1. Toast.show need invoke ToastView.createView which need overlayState from its ancestor widget.
2. The official demo initial the ToastContext in MyApp.build, which ancestor element is RenderObjectToWidgetElement -> StatelessElement，so Overlay.of can't find overlayState.
3. Meanwhile the MaterialApp already insert an overlayState for us

[SOLUTION]

Use the context of MyHomePage instead of MyApp.

[TEST]

Work with Flutter (Channel stable, 2.10.5, on Microsoft Windows [Version 10.0.19043.1766], locale en-US)

[ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: 'package:flutter/src/widgets/overlay.dart': Failed assertion: line 147 pos 12: '_overlay != null': is not true.

[ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: Null check operator used on a null value

My code is very simple and I'm still getting an error :

void initState() { super.initState(); Toast.show("Toast plugin app", context, duration: Toast.LENGTH_SHORT, gravity: Toast.BOTTOM); }

error :

[ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: NoSuchMethodError: The method 'insert' was called on null. E/flutter ( 2653): Receiver: null E/flutter ( 2653): Tried calling: insert(Instance of 'OverlayEntry')

Hi! You made a good open source library. I really appreciate about it.

But there is a bug which is related with the soft keyboard. Toast Message is not visible when keyboard is shown.

Thanks!