场景

Flutter版本更新后，运行出现以下问题，App闪退。

W/FlutterEngineCxnRegstry(10678): Attempted to register plugin (io.flutter.embedding.engine.plugins.shim.ShimPluginRegistry$ShimRegistrarAggregate@3777b26) but it was already registered with this FlutterEngine (io.flutter.embedding.engine.FlutterEngine@6c93367).
E/AndroidRuntime(10678): FATAL EXCEPTION: main
E/AndroidRuntime(10678): Process: com.example.firstflutterapp, PID: 10678
E/AndroidRuntime(10678): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.firstflutterapp/com.example.firstflutterapp.MainActivity}: java.lang.NullPointerException: Attempt to invoke interface method 'void io.flutter.plugin.common.BinaryMessenger.setMessageHandler(java.lang.String, io.flutter.plugin.common.BinaryMessenger$BinaryMessageHandler)' on a null object reference
E/AndroidRuntime(10678):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3898)
E/AndroidRuntime(10678):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4081)
E/AndroidRuntime(10678):  at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:91)
E/AndroidRuntime(10678):  at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:149)
E/AndroidRuntime(10678):  at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:103)
E/AndroidRuntime(10678):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2462)
E/AndroidRuntime(10678):  at android.os.Handler.dispatchMessage(Handler.java:110)
E/AndroidRuntime(10678):  at android.os.Looper.loop(Looper.java:219)
E/AndroidRuntime(10678):  at android.app.ActivityThread.main(ActivityThread.java:8393)
E/AndroidRuntime(10678):  at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(10678):  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
E/AndroidRuntime(10678):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1055)
E/AndroidRuntime(10678): Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'void io.flutter.plugin.common.BinaryMessenger.setMessageHandler(java.lang.String, io.flutter.plugin.common.BinaryMessenger$BinaryMessageHandler)' on a null object reference
E/AndroidRuntime(10678):  at io.flutter.plugin.common.MethodChannel.setMethodCallHandler(MethodChannel.java:119)
E/AndroidRuntime(10678):  at com.jzoom.amaplocation.AmapLocationPlugin.registerWith(AmapLocationPlugin.java:54)
E/AndroidRuntime(10678):  at io.flutter.plugins.GeneratedPluginRegistrant.registerWith(GeneratedPluginRegistrant.java:18)
E/AndroidRuntime(10678):  at com.example.firstflutterapp.MainActivity.configureFlutterEngine(MainActivity.kt:31)
E/AndroidRuntime(10678):  at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onAttach(FlutterActivityAndFragmentDelegate.java:180)
E/AndroidRuntime(10678):  at io.flutter.embedding.android.FlutterActivity.onCreate(FlutterActivity.java:409)
E/AndroidRuntime(10678):  at android.app.Activity.performCreate(Activity.java:8121)
E/AndroidRuntime(10678):  at android.app.Activity.performCreate(Activity.java:8109)
E/AndroidRuntime(10678):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1320)
E/AndroidRuntime(10678):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3871)
E/AndroidRuntime(10678):  ... 11 more

解决方案

根据错误描述，是因为注册plugin时提示已经被注册过了了。
涉及到插件，需要看官方文档。https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects。
以下是我的MainActivity.kt

class MainActivity: FlutterActivity() {override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {super.configureFlutterEngine(flutterEngine)GeneratedPluginRegistrant.registerWith(flutterEngine)}
}

这是官方代码

+    @Override
+    public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
+        GeneratedPluginRegistrant.registerWith(flutterEngine);
+        new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL)
+                .setMethodCallHandler(
+                    (call, result) -> {
+                        // Your existing code
+                }
+        );
+    }

发现多了个super方法，查看FlutterActivity源码发现，configureFlutterEngine方法已经调用过了GeneratedPluginRegistrant.registerWith(flutterEngine)，所以我们只需要删除super.configureFlutterEngine(flutterEngine)即可。

class MainActivity: FlutterActivity() {override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {//super.configureFlutterEngine(flutterEngine)GeneratedPluginRegistrant.registerWith(flutterEngine)}
}

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解决attempted to register plugin but it was already registered with this flutterengine

场景

解决方案

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