Ionic 4でスプラッシュスクリーンの後に白いスクリーンがスタックするのはなぜですか？
走る ionic cordova run Android for my Ionic Cordovaプロジェクト。現時点では、モバイルをUSB経由でPCに接続しています。そのため、このコマンドを実行すると、実際のデバイスにアプリがインストールされますAndroid Redmi Note 6 PRO。
しかし、実際に何が起こるかは、アプリが開いたとき、白い画面だけが表示され、他には何もありません。最初はスプラッシュ画面を表示し、次に白い画面を永久に表示します。なぜこの動作が起こるのですか？ Ionic 4。
以下は、アプリをクリックしてAndroidエミュレータ（Androidエミュレータ）でも白い画面が表示される）で開いた後の私のlogcatログです。
2019-02-11 00:01:24.131 5945-5945/? I/zygote: Not late-enabling -Xcheck:jni (already on)
2019-02-11 00:01:24.148 5945-5945/? W/zygote: Unexpected CPU variant for X86 using defaults: x86
2019-02-11 00:01:24.312 5945-5945/io.ionic.starter I/CordovaLog: Changing log level to DEBUG(3)
2019-02-11 00:01:24.312 5945-5945/io.ionic.starter I/CordovaActivity: Apache Cordova native platform version 7.1.4 is starting
2019-02-11 00:01:24.312 5945-5945/io.ionic.starter D/CordovaActivity: CordovaActivity.onCreate()
2019-02-11 00:01:24.342 5945-5945/io.ionic.starter I/WebViewFactory: Loading com.Android.chrome version 61.0.3163.98 (code 316409812)
2019-02-11 00:01:24.350 5945-5945/io.ionic.starter I/zygote: The ClassLoaderContext is a special shared library.
2019-02-11 00:01:24.392 5945-5945/io.ionic.starter I/cr_LibraryLoader: Time to load native libraries: 8 ms (timestamps 2894-2902)
2019-02-11 00:01:24.421 5945-5945/io.ionic.starter I/chromium: [INFO:library_loader_hooks.cc(136)] Chromium logging enabled: level = 0, default verbosity = 0
2019-02-11 00:01:24.422 5945-5945/io.ionic.starter I/cr_LibraryLoader: Expected native library version number "61.0.3163.98", actual native library version number "61.0.3163.98"
2019-02-11 00:01:24.436 5945-5963/io.ionic.starter W/cr_ChildProcLH: Create a new ChildConnectionAllocator with package name = com.Android.chrome, sandboxed = true
2019-02-11 00:01:24.464 5945-5945/io.ionic.starter I/cr_BrowserStartup: Initializing chromium process, singleProcess=false
2019-02-11 00:01:24.513 5945-5945/io.ionic.starter W/o.ionic.starter: type=1400 audit(0.0:48): avc: denied { read } for name="vmstat" dev="proc" ino=4026532039 scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:proc:s0 tclass=file permissive=0
2019-02-11 00:01:24.544 5945-5945/io.ionic.starter I/zygote: Android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasWideColorDisplay retrieved: 0
2019-02-11 00:01:24.553 5945-5945/io.ionic.starter D/EGL_emulation: eglCreateContext: 0xa4516160: maj 3 min 0 rcv 3
2019-02-11 00:01:24.555 5945-5945/io.ionic.starter D/EGL_emulation: eglMakeCurrent: 0xa4516160: ver 3 0 (tinfo 0x94123730)
2019-02-11 00:01:24.635 5945-5945/io.ionic.starter D/IonicWebViewEngine: Ionic Web View Engine Starting Right Up 1...
2019-02-11 00:01:24.659 5945-5945/io.ionic.starter D/SystemWebViewEngine: CordovaWebView is running on device made by: Google
2019-02-11 00:01:24.675 5945-5945/io.ionic.starter D/PluginManager: init()
2019-02-11 00:01:24.718 5945-5999/io.ionic.starter D/OpenGLRenderer: HWUI GL Pipeline
2019-02-11 00:01:24.787 5945-5945/io.ionic.starter D/CordovaWebViewImpl: >>> loadUrl(file:///Android_asset/www/index.html)
2019-02-11 00:01:24.793 5945-5963/io.ionic.starter I/cr_LibraryLoader: Using linker: org.chromium.base.library_loader.ModernLinker
2019-02-11 00:01:24.795 5945-5992/io.ionic.starter W/cr_media: Requires BLUETOOTH permission
2019-02-11 00:01:24.800 5945-5945/io.ionic.starter D/CordovaActivity: Started the activity.
2019-02-11 00:01:24.805 5945-5945/io.ionic.starter D/CordovaActivity: Resumed the activity.
2019-02-11 00:01:24.834 5945-5999/io.ionic.starter I/OpenGLRenderer: Initialized EGL, version 1.4
2019-02-11 00:01:24.834 5945-5999/io.ionic.starter D/OpenGLRenderer: Swap behavior 1
2019-02-11 00:01:24.836 5945-5999/io.ionic.starter W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
2019-02-11 00:01:24.836 5945-5999/io.ionic.starter D/OpenGLRenderer: Swap behavior 0
2019-02-11 00:01:24.856 5945-5999/io.ionic.starter D/EGL_emulation: eglCreateContext: 0xa48062c0: maj 3 min 0 rcv 3
2019-02-11 00:01:24.871 5945-5999/io.ionic.starter D/EGL_emulation: eglMakeCurrent: 0xa48062c0: ver 3 0 (tinfo 0xa48038d0)
2019-02-11 00:01:25.188 5945-5999/io.ionic.starter D/EGL_emulation: eglMakeCurrent: 0xa48062c0: ver 3 0 (tinfo 0xa48038d0)
2019-02-11 00:01:25.209 5945-6010/io.ionic.starter D/EGL_emulation: eglCreateContext: 0x94170560: maj 3 min 0 rcv 3
2019-02-11 00:01:25.212 5945-6010/io.ionic.starter D/EGL_emulation: eglMakeCurrent: 0x94170560: ver 3 0 (tinfo 0x92f2a180)
2019-02-11 00:01:25.302 5945-6010/io.ionic.starter I/VideoCapabilities: Unsupported profile 4 for video/mp4v-es
2019-02-11 00:01:25.302 5945-5999/io.ionic.starter D/EGL_emulation: eglMakeCurrent: 0xa48062c0: ver 3 0 (tinfo 0xa48038d0)
2019-02-11 00:01:25.313 5945-6010/io.ionic.starter W/cr_MediaCodecUtil: HW encoder for video/avc is not available on this device.
2019-02-11 00:01:25.372 5945-5999/io.ionic.starter D/EGL_emulation: eglMakeCurrent: 0xa48062c0: ver 3 0 (tinfo 0xa48038d0)
2019-02-11 00:01:25.450 5945-5999/io.ionic.starter D/EGL_emulation: eglMakeCurrent: 0xa48062c0: ver 3 0 (tinfo 0xa48038d0)
2019-02-11 00:01:25.458 5945-6010/io.ionic.starter D/EGL_emulation: eglCreateContext: 0x941716a0: maj 3 min 0 rcv 3
2019-02-11 00:01:25.460 5945-6010/io.ionic.starter D/EGL_emulation: eglMakeCurrent: 0x941716a0: ver 3 0 (tinfo 0x92f2a180)
2019-02-11 00:01:25.537 5945-6012/io.ionic.starter W/cr_CrashFileManager: /data/user/0/io.ionic.starter/cache/WebView/Crash Reports does not exist or is not a directory
2019-02-11 00:01:25.537 5945-5950/io.ionic.starter I/zygote: Do partial code cache collection, code=22KB, data=30KB
2019-02-11 00:01:25.541 5945-5950/io.ionic.starter I/zygote: After code cache collection, code=22KB, data=30KB
2019-02-11 00:01:25.541 5945-5950/io.ionic.starter I/zygote: Increasing code cache capacity to 128KB
2019-02-11 00:01:25.546 5945-5945/io.ionic.starter D/CordovaWebViewImpl: onPageDidNavigate(file:///Android_asset/www/index.html)
2019-02-11 00:01:25.611 5945-5945/io.ionic.starter D/CordovaWebViewImpl: onPageFinished(file:///Android_asset/www/index.html)
2019-02-11 00:01:25.619 5945-5945/io.ionic.starter D/CordovaWebViewImpl: onPageDidNavigate(http://localhost/)
2019-02-11 00:01:25.619 5945-5988/io.ionic.starter D/SERVER: Handling local request: http://localhost/
2019-02-11 00:01:25.640 5945-5988/io.ionic.starter D/SERVER: Handling local request: http://localhost/runtime.js
2019-02-11 00:01:25.641 5945-5988/io.ionic.starter D/SERVER: Handling local request: http://localhost/polyfills.js
2019-02-11 00:01:25.644 5945-5988/io.ionic.starter D/SERVER: Handling local request: http://localhost/styles.js
2019-02-11 00:01:25.645 5945-5988/io.ionic.starter D/SERVER: Handling local request: http://localhost/cordova.js
2019-02-11 00:01:25.646 5945-5988/io.ionic.starter D/SERVER: Handling local request: http://localhost/vendor.js
2019-02-11 00:01:25.647 5945-5988/io.ionic.starter D/SERVER: Handling local request: http://localhost/main.js
2019-02-11 00:01:25.663 5945-5945/io.ionic.starter D/SystemWebChromeClient: http://localhost/: Line 10 : The key "viewport-fit" is not recognized and ignored.
2019-02-11 00:01:25.663 5945-5945/io.ionic.starter I/chromium: [INFO:CONSOLE(10)] "The key "viewport-fit" is not recognized and ignored.", source: http://localhost/ (10)
2019-02-11 00:01:25.997 5945-5991/io.ionic.starter E/chromium: [ERROR:service_manager.cc(156)] Connection InterfaceProviderSpec prevented service: content_renderer from binding interface: blink::mojom::BudgetService exposed by: content_browser
2019-02-11 00:01:26.012 5945-5945/io.ionic.starter D/JsMessageQueue: Set native->JS mode to EvalBridgeMode
2019-02-11 00:01:26.083 5945-5988/io.ionic.starter D/SERVER: Handling local request: http://localhost/cordova_plugins.js
2019-02-11 00:01:26.101 5945-5988/io.ionic.starter D/SERVER: Handling local request: http://localhost/plugins/cordova-plugin-statusbar/www/statusbar.js
2019-02-11 00:01:26.102 5945-5988/io.ionic.starter D/SERVER: Handling local request: http://localhost/plugins/cordova-plugin-device/www/device.js
2019-02-11 00:01:26.106 5945-5988/io.ionic.starter D/SERVER: Handling local request: http://localhost/plugins/cordova-plugin-splashscreen/www/splashscreen.js
2019-02-11 00:01:26.107 5945-5988/io.ionic.starter D/SERVER: Handling local request: http://localhost/plugins/cordova-plugin-ionic-webview/src/www/util.js
2019-02-11 00:01:26.108 5945-5988/io.ionic.starter D/SERVER: Handling local request: http://localhost/plugins/cordova-plugin-ionic-keyboard/www/Android/keyboard.js
2019-02-11 00:01:26.201 5945-5945/io.ionic.starter W/zygote: Attempt to remove non-JNI local reference, dumping thread
2019-02-11 00:01:26.213 5945-5999/io.ionic.starter D/EGL_emulation: eglMakeCurrent: 0xa48062c0: ver 3 0 (tinfo 0xa48038d0)
2019-02-11 00:01:26.268 5945-5999/io.ionic.starter D/EGL_emulation: eglMakeCurrent: 0xa48062c0: ver 3 0 (tinfo 0xa48038d0)
2019-02-11 00:01:27.505 5945-5999/io.ionic.starter D/EGL_emulation: eglMakeCurrent: 0xa48062c0: ver 3 0 (tinfo 0xa48038d0)
2019-02-11 00:01:27.812 5945-5945/io.ionic.starter W/zygote: Attempt to remove non-JNI local reference, dumping thread
2019-02-11 00:01:27.826 5945-5999/io.ionic.starter D/EGL_emulation: eglMakeCurrent: 0xa48062c0: ver 3 0 (tinfo 0xa48038d0)
2019-02-11 00:01:27.878 5945-5945/io.ionic.starter W/zygote: Attempt to remove non-JNI local reference, dumping thread
2019-02-11 00:01:27.887 5945-5945/io.ionic.starter D/SystemWebChromeClient: http://localhost/main.js: Line 3385 : TypeError: Cannot read property 'apply' of null
2019-02-11 00:01:27.887 5945-5945/io.ionic.starter I/chromium: [INFO:CONSOLE(3385)] "TypeError: Cannot read property 'apply' of null", source: http://localhost/main.js (3385)
2019-02-11 00:01:27.894 5945-5945/io.ionic.starter D/SystemWebChromeClient: http://localhost/vendor.js: Line 75947 : Ionic Native: deviceready event fired after 973 ms
2019-02-11 00:01:27.895 5945-5945/io.ionic.starter I/chromium: [INFO:CONSOLE(75947)] "Ionic Native: deviceready event fired after 973 ms", source: http://localhost/vendor.js (75947)
2019-02-11 00:01:27.896 5945-5988/io.ionic.starter D/SERVER: Handling local request: http://localhost/assets/icon/favicon.png
2019-02-11 00:01:27.916 5945-5945/io.ionic.starter W/zygote: Attempt to remove non-JNI local reference, dumping thread
2019-02-11 00:01:27.924 5945-5945/io.ionic.starter D/CordovaWebViewImpl: onPageFinished(http://localhost/)
2019-02-11 00:01:27.951 5945-5945/io.ionic.starter W/zygote: Attempt to remove non-JNI local reference, dumping thread
2019-02-11 00:01:28.063 5945-5945/io.ionic.starter I/chatty: uid=10080(io.ionic.starter) identical 3 lines
2019-02-11 00:01:28.110 5945-5945/io.ionic.starter W/zygote: Attempt to remove non-JNI local reference, dumping thread
Chromeデバッガーの表示：
TypeError: Cannot read property 'apply' of null
at vendor.js:88820
at NgRedux.Push../node_modules/ng2-redux/lib/components/ng-redux.js.NgRedux.configureStore (vendor.js:87925)
at new AppModule (main.js:1511)
at _createClass (vendor.js:56970)
at _createProviderInstance (vendor.js:56940)
at initNgModule (vendor.js:56873)
at new NgModuleRef_ (vendor.js:57600)
at createNgModuleRef (vendor.js:57589)
at Object.debugCreateNgModuleRef [as createNgModuleRef] (vendor.js:59420)
at NgModuleFactory_.Push../node_modules/@angular/core/fesm5/core.js.NgModuleFactory_.create (vendor.js:60124)
vendor.js:75947 Ionic Native: deviceready event fired after 776 ms
私の場合、それはAndroidプラットフォーム構成に関連するものでした。私は問題を解決するために以下を行いました：
Androidフォルダーを削除します（プロジェクトディレクトリまたはプラットフォームディレクトリの下）。- コマンドを実行してAndroidをプラットフォームとして追加します。
npx cap Androidを追加
上記のコマンドは、ionic for Capacitorの場合です。cordovaを使用している場合は、通常のコマンドを使用できます。
- Android Studioを開いてAPKを作成します。このAPKは期待どおりに動作するはずです。