multiple_flutters_android not found

[zsunkun]

There is no multiple_flutters_android directory on the master branch.
https://github.com/flutter/samples/blob/master/add_to_app/multiple_flutters/multiple_flutters_android/README.md get 404

[xster]

@gaaclarke let's merge #677

[xster]

@zhouxin1233 please see our code of conduct at https://github.com/flutter/flutter/blob/master/CODE_OF_CONDUCT.md and use productive language to help everyone move forward.

[gaaclarke]

Landed.

[zhouxin1233]

@zhouxin1233 please see our code of conduct at https://github.com/flutter/flutter/blob/master/CODE_OF_CONDUCT.md and use productive language to help everyone move forward.

2021-03-09 11:01:20.706 21297-21297/dev.flutter.multipleflutters E/AndroidRuntime: FATAL EXCEPTION: main
Process: dev.flutter.multipleflutters, PID: 21297
java.lang.RuntimeException: Unable to start activity ComponentInfo{dev.flutter.multipleflutters/dev.flutter.multipleflutters.SingleFlutterActivity}: java.lang.IllegalStateException: Failed to spawn new JNI connected shell from existing shell.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3762)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3938)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2277)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:246)
at android.app.ActivityThread.main(ActivityThread.java:8425)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:596)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)
Caused by: java.lang.IllegalStateException: Failed to spawn new JNI connected shell from existing shell.
at io.flutter.util.Preconditions.checkState(Preconditions.java:52)
at io.flutter.embedding.engine.FlutterJNI.spawn(FlutterJNI.java:342)
at io.flutter.embedding.engine.FlutterEngine.spawn(FlutterEngine.java:383)
at io.flutter.embedding.engine.FlutterEngineGroup.createAndRunEngine(FlutterEngineGroup.java:101)
at dev.flutter.multipleflutters.EngineBindings.(EngineBindings.kt:45)
at dev.flutter.multipleflutters.SingleFlutterActivity$engineBindings$2.invoke(SingleFlutterActivity.kt:16)
at dev.flutter.multipleflutters.SingleFlutterActivity$engineBindings$2.invoke(SingleFlutterActivity.kt:14)
at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
at dev.flutter.multipleflutters.SingleFlutterActivity.getEngineBindings(Unknown Source:2)
at dev.flutter.multipleflutters.SingleFlutterActivity.provideFlutterEngine(SingleFlutterActivity.kt:30)
at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.setupFlutterEngine(FlutterActivityAndFragmentDelegate.java:227)
at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onAttach(FlutterActivityAndFragmentDelegate.java:155)
at io.flutter.embedding.android.FlutterActivity.onCreate(FlutterActivity.java:409)
at dev.flutter.multipleflutters.SingleFlutterActivity.onCreate(SingleFlutterActivity.kt:20)
at android.app.Activity.performCreate(Activity.java:8183)
at android.app.Activity.performCreate(Activity.java:8167)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3735)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3938) 
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85) 
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2277) 
at android.os.Handler.dispatchMessage(Handler.java:106) 
at android.os.Looper.loop(Looper.java:246) 
at android.app.ActivityThread.main(ActivityThread.java:8425) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:596) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)