Android 添加到应用程序中不存在请求的颤振引擎

我已使用缓存的颤振引擎进入现有的本机应用程序（添加到应用程序）

override fun onCreate(savedInstanceState: Bundle?) {
        Log.d(TAG, "onCreate")
        
        
        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)
        context = this.application.applicationContext
        if (!FlutterEngineCache.getInstance().contains(
                FLUTTER_ENGINE
            )
        ) {
            mFlutterEngine = FlutterEngine(context)
            mFlutterEngine.dartExecutor
                .executeDartEntrypoint(DartExecutor.DartEntrypoint.createDefault())
            FlutterEngineCache.getInstance()
                .put(FLUTTER_ENGINE, mFlutterEngine)
        }
        //Create Flutter Fragment
        mFragmentManager = supportFragmentManager
        mFlutterFragment = mFragmentManager.findFragmentByTag(FLUTTER_FRAGMENT) as FlutterFragment?
        if (mFlutterFragment == null) {
            mFlutterFragment =
                FlutterFragment.withCachedEngine(FLUTTER_ENGINE).transparencyMode(FlutterView.TransparencyMode.opaque).build()
            mFragmentManager
                .beginTransaction()
                .add(R.id.fragment_container, mFlutterFragment as Fragment, FLUTTER_FRAGMENT)
                .commit()
        } else {
            mFragmentManager
                .beginTransaction()
                .show(mFragmentManager.findFragmentByTag(FLUTTER_FRAGMENT)!!)
                .commit()
        }
}

我在生产应用程序中遇到以下崩溃

  Caused by: java.lang.IllegalStateException: The requested cached FlutterEngine did not exist in the FlutterEngineCache: 'FLUTTER_ENGINE'
        at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.setupFlutterEngine(FlutterActivityAndFragmentDelegate.java:211)
        at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onAttach(FlutterActivityAndFragmentDelegate.java:157)
        at io.flutter.embedding.android.FlutterFragment.onAttach(FlutterFragment.java:597)
        at androidx.fragment.app.Fragment.performAttach(Fragment.java:2574)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:828)
        at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
        at androidx.fragment.app.FragmentManagerImpl.dispatchStateChange(FragmentManagerImpl.java:2659)
        at androidx.fragment.app.FragmentManagerImpl.dispatchCreate(FragmentManagerImpl.java:2607)
        at androidx.fragment.app.FragmentController.dispatchCreate(FragmentController.java:235)
        at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:316)
        at androidx.appcompat.app.AppCompatActivity.onCreate(AppCompatActivity.java:106)
        at com.flutter.android.MainActivity.onCreate(MainActivity.kt:33)
 

如何繁殖

打开开发人员设置，将“后台进程”设置为“否” “后台进程”并设置为“不保留活动”

打开应用程序，然后按home

再次打开应用程序。。它会崩溃，只有一个例外

原因：java.lang.IllegalStateException:请求的缓存FlatterEngine在FlatterEngineCache中不存在：“Flatter\u ENGINE”

解决方案

在

super.oncreate（）之前初始化颤振引擎

如何繁殖

打开开发人员设置，将“后台进程”设置为“否”
“后台进程”并设置为“不保留活动”


打开应用程序，然后按home


再次打开应用程序。。它会崩溃，只有一个例外

原因：java.lang.IllegalStateException:请求的缓存FlatterEngine在FlatterEngineCache中不存在：“Flatter\u ENGINE”


解决方案

在
super.oncreate（）之前初始化颤振引擎

我有一个有3个标签的应用程序，其中一个有一个颤振碎片。我们的应用程序在制作时也发生了崩溃，但我无法复制它。也不适用于如上所述的再现场景。我最终在onDestroy手动移除了颤振引擎，以再现这种情况。作为一个解决方案，我检查颤振标签是否打开，然后按照上面所述创建引擎。我有一个有3个标签的应用程序，其中一个标签上有颤振碎片。我们的应用程序在制作时也发生了崩溃，但我无法复制它。也不适用于如上所述的再现场景。我最终在onDestroy手动移除了颤振引擎，以再现这种情况。作为一个解决方案，我检查颤振选项卡是否打开，然后创建如上所述的引擎。
override fun onCreate(savedInstanceState: Bundle?) {
        Log.d(TAG, "onCreate")
         context = this.application.applicationContext
        if (!FlutterEngineCache.getInstance().contains(
                FLUTTER_ENGINE
            )
        ) {
            mFlutterEngine = FlutterEngine(context)
            mFlutterEngine.dartExecutor
                .executeDartEntrypoint(DartExecutor.DartEntrypoint.createDefault())
            FlutterEngineCache.getInstance()
                .put(FLUTTER_ENGINE, mFlutterEngine)
        }
       
        
        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)
        //Create Flutter Fragment
        mFragmentManager = supportFragmentManager
        mFlutterFragment = mFragmentManager.findFragmentByTag(FLUTTER_FRAGMENT) as FlutterFragment?
        if (mFlutterFragment == null) {
            mFlutterFragment =
                FlutterFragment.withCachedEngine(FLUTTER_ENGINE).transparencyMode(FlutterView.TransparencyMode.opaque).build()
            mFragmentManager
                .beginTransaction()
                .add(R.id.fragment_container, mFlutterFragment as Fragment, FLUTTER_FRAGMENT)
                .commit()
        } else {
            mFragmentManager
                .beginTransaction()
                .show(mFragmentManager.findFragmentByTag(FLUTTER_FRAGMENT)!!)
                .commit()
        }