How to Programmatically Exit iOS or Android App with Code in Flutter
Introduction
————
In Flutter, programmatically exiting an app can be a complex task, especially when dealing with different platforms such as iOS and Android. There are various scenarios where you might want to exit your app, such as when a user logs out or when an error occurs that cannot be recovered from. In this article, we will explore how to programmatically exit an iOS or Android app with code in Flutter.
Platform Channels
To exit an app in Flutter, you need to use platform channels to communicate with the native platform. Platform channels provide a way to call native code from Dart and vice versa. You can use the `MethodChannel` class to invoke a native method that will exit the app.
iOS Exit
To exit an iOS app, you can use the `exit` function from the `Foundation` framework. However, this function is private and should not be used in a production app. Instead, you can use the `UIApplicationDelegate` method `applicationDidEnterBackground` to exit the app when it enters the background.
“`dart
import ‘package:flutter/services.dart’;
class ExitApp {
static const platform = MethodChannel(‘exit_app’);
static Future
try {
await platform.invokeMethod(‘exitApp’);
} on PlatformException catch (e) {
print(‘Failed to exit app: ${e.message}’);
}
}
}
“`
Android Exit
To exit an Android app, you can use the `System.exit` function from the `java.lang` package. However, this function should be used with caution, as it can cause unexpected behavior.
“`dart
import ‘package:flutter/services.dart’;
class ExitApp {
static const platform = MethodChannel(‘exit_app’);
static Future
try {
await platform.invokeMethod(‘exitApp’);
} on PlatformException catch (e) {
print(‘Failed to exit app: ${e.message}’);
}
}
}
“`
Native Code
To exit the app, you need to write native code for each platform. For iOS, you can use the following code:
“`objectivec
#import
@interface AppDelegate : FlutterAppDelegate
@end
@implementation AppDelegate
– (void)applicationDidEnterBackground:(UIApplication *)application {
exit(0);
}
@end
“`
For Android, you can use the following code:
“`java
import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;
public class MainActivity extends FlutterActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
new MethodChannel(getFlutterEngine().getDartExecutor().getBinaryMessenger(), “exit_app”)
.setMethodCallHandler((call, result) -> {
if (call.method.equals(“exitApp”)) {
System.exit(0);
}
});
}
}
“`
Conclusion
———-
In this article, we have explored how to programmatically exit an iOS or Android app with code in Flutter. We have discussed the use of platform channels to communicate with the native platform and provided examples of native code for each platform. By using the `MethodChannel` class and writing native code, you can exit your app in a safe and controlled manner.
FAQ
—-
1. Q: How do I exit my Flutter app programmatically?
A: You can exit your Flutter app programmatically by using the `MethodChannel` class to invoke a native method that will exit the app.
2. Q: What is the difference between `System.exit` and `exit`?
A: `System.exit` is a Java function that exits the JVM, while `exit` is a C function that exits the program.
3. Q: Can I use `System.exit` to exit my Android app?
A: Yes, you can use `System.exit` to exit your Android app, but it should be used with caution, as it can cause unexpected behavior.
4. Q: How do I write native code for iOS to exit the app?
A: You can write native code for iOS to exit the app by using the `applicationDidEnterBackground` method in the `AppDelegate` class.
5. Q: Can I exit my Flutter app programmatically on both iOS and Android platforms?
A: Yes, you can exit your Flutter app programmatically on both iOS and Android platforms by using the `MethodChannel` class and writing native code for each platform.
