flutter 应用程序在启动时就崩溃了

Question

应用程序启动并立即存在后，控制台显示以下错误：

我在她那里搜索了很多解决方案，但什么也没弄清楚。

√ Built build\app\outputs\flutter-apk\app-debug.apk.
Installing build\app\outputs\flutter-apk\app.apk...
E/AndroidRuntime(13552): FATAL EXCEPTION: main
E/AndroidRuntime(13552): Process: PID: 13552
E/AndroidRuntime(13552): java.lang.RuntimeException: Unable to instantiate application Application: java.lang.ClassNotFoundException: Didn't find class "Application" on path: DexPathList[[zip file "/data/app/-3NMRdDTvHVRYO7itAb__EQ==/base.apk"],nativeLibraryDirectories=[/data/app/3NMRdDTvHVRYO7itAb__EQ==/lib/x86, /data/app/3NMRdDTvHVRYO7itAb__EQ==/base.apk!/lib/x86, /system/lib, /system/product/lib]]
E/AndroidRuntime(13552):    at android.app.LoadedApk.makeApplication(LoadedApk.java:1226)
E/AndroidRuntime(13552):    at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6431)
E/AndroidRuntime(13552):    at android.app.ActivityThread.access$1300(ActivityThread.java:219)
E/AndroidRuntime(13552):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1859)
E/AndroidRuntime(13552):    at android.os.Handler.dispatchMessage(Handler.java:107)
E/AndroidRuntime(13552):    at android.os.Looper.loop(Looper.java:214)
E/AndroidRuntime(13552):    at android.app.ActivityThread.main(ActivityThread.java:7356)
E/AndroidRuntime(13552):    at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(13552):    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
E/AndroidRuntime(13552):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
E/AndroidRuntime(13552): Caused by: java.lang.ClassNotFoundException: Didn't find class "Application" on path: DexPathList[[zip file "/data/app/-3NMRdDTvHVRYO7itAb__EQ==/base.apk"],nativeLibraryDirectories=[/data/app/3NMRdDTvHVRYO7itAb__EQ==/lib/x86, /data/app/3NMRdDTvHVRYO7itAb__EQ==/base.apk!/lib/x86, /system/lib, /system/product/lib]]
E/AndroidRuntime(13552):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:196)
E/AndroidRuntime(13552):    at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
E/AndroidRuntime(13552):    at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
E/AndroidRuntime(13552):    at android.app.AppComponentFactory.instantiateApplication(AppComponentFactory.java:76)
E/AndroidRuntime(13552):    at androidx.core.app.CoreComponentFactory.instantiateApplication(CoreComponentFactory.java:52)
E/AndroidRuntime(13552):    at android.app.Instrumentation.newApplication(Instrumentation.java:1148)
E/AndroidRuntime(13552):    at android.app.LoadedApk.makeApplication(LoadedApk.java:1218)
E/AndroidRuntime(13552):    ... 9 more

Answer 1

我认为您的错误是由于

Dex Error

引起的，可以通过启用multiDex来解决。因此，在您的

android/app

目录中，将这些行添加到

build.gradle

文件中：

android {
    defaultConfig {
        ...
        multiDexEnabled true
    }
}

dependencies {
  implementation 'com.android.support:multidex:1.0.3'
  ....

Answer 2

如果您的应用程序目标为21 api级别及以上默认启用MultiDex