flutter_boost-3.0-null-safety-preview.18 运行example-new到手机上黑屏

FlutterBoostActivity、FlutterBoostFragment、FlutterTextureHooker 这三个类已经改了。

**下面是flutter的版本：**
```
Flutter 2.10.4 • channel stable • https://github.com/flutter/flutter.git
Framework • revision c860cba910 (3 weeks ago) • 2022-03-25 00:23:12 -0500
Engine • revision 57d3bac3dd
Tools • Dart 2.16.2 • DevTools 2.9.2
```

**console log**
```console
Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure you trust this source!
Launching lib\main.dart on LIO AN00 in debug mode...
Running Gradle task 'assembleDebug'...
Warning: Mapping new ns http://schemas.android.com/repository/android/common/02 to old ns http://schemas.android.com/repository/android/common/01
Warning: Mapping new ns http://schemas.android.com/repository/android/generic/02 to old ns http://schemas.android.com/repository/android/generic/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/addon2/02 to old ns http://schemas.android.com/sdk/android/repo/addon2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/repository2/02 to old ns http://schemas.android.com/sdk/android/repo/repository2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/sys-img2/02 to old ns http://schemas.android.com/sdk/android/repo/sys-img2/01
√ Built build\app\outputs\flutter-apk\app-debug.apk.
Installing build\app\outputs\flutter-apk\app.apk...
W/FlutterActivityAndFragmentDelegate( 9170): A splash screen was provided to Flutter, but this is deprecated. See flutter.dev/go/android-splash-migration for migration steps.
Debug service listening on ws://127.0.0.1:50856/gJQb_eewCN4=/ws
Syncing files to device LIO AN00...
I/flutter ( 9170): FlutterBoost#page_visibility, #addGlobalObserver, Instance of 'AppLifecycleObserver'
I/flutter ( 9170): FlutterBoost#boost_flutter_binding: handleAppLifecycleStateChanged AppLifecycleState.resumed
V/FlutterBoostPlugin( 9170): #saveStackToHost: com.idlefish.flutterboost.Messages$StackInfo@a493e13
I/flutter ( 9170): FlutterBoost#_restoreStackForHotRestart, null, null
I/flutter ( 9170): FlutterBoost#_saveStackForHotRestart, [1649931621229_/], {1649931621229_/: [{pageName: /, uniqueId: 1649931621229_/, arguments: {}}]}
I/AwareBitmapCacher( 9170): init lrucache size: 2097152 pid=9170
```

Start by running the example-new application on a device with Flutter 2.10.4 and compare the result with the supplied console log. Inspect FlutterBoostActivity, FlutterBoostFragment, and FlutterTextureHooker, which the report identifies as recently changed. Done means example-new renders normally instead of showing a black screen.

Written by the indexing model from the issue text.