android - 由 : java. lang.ClassNotFoundException: Didn't find class "com.example.aol.Application"on path: DexPathList error flutter 引起

Question

我正在尝试运行一个项目，但我发现了一个错误:

Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.aol.Application" on path: DexPathList[[zip file "/data/app/com.example.aol-1JWhf7hk26dkh1US0WG4tg==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.aol-1JWhf7hk26dkh1US0WG4tg==/lib/arm64, /data/app/com.example.aol-1JWhf7hk26dkh1US0WG4tg==/base.apk!/lib/arm64-v8a, /system/lib64, /system/vendor/lib64]]

那么有没有人知道以下错误:

这是相关的 list

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.aol" xmlns:tools="http://schemas.android.com/tools">
    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
         calls FlutterMain.startInitialization(this); in its onCreate method.
         In most cases you can leave this as-is, but you if you want to provide
         additional functionality it is fine to subclass or reimplement
         FlutterApplication and put your custom class here. -->
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.FLASHLIGHT" />
    <application
        android:name=".Application" 
        tools:replace="android:label"
        android:label="aol"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <!-- This keeps the window background of the activity showing
                 until Flutter renders its first frame. It can be removed if
                 there is no splash screen (such as the default splash screen
                 defined in @style/LaunchTheme). -->
            <meta-data
                android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
                android:value="true" />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
            <intent-filter>
                <action android:name="FLUTTER_NOTIFICATION_CLICK" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
           
        </activity>
        <activity android:name="com.braintreepayments.api.BraintreeBrowserSwitchActivity"
            android:launchMode="singleTask">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />
                <data android:scheme="${applicationId}.braintree" />
            </intent-filter>
        </activity>
        <meta-data android:name="com.facebook.sdk.ApplicationId"
    android:value="@string/facebook_app_id"/>
    <!-- TODO: Replace with your real AdMob app ID -->
        <meta-data
            android:name="com.google.android.gms.ads.APPLICATION_ID"
            android:value= "@string/android__admob_ads_id_key" />
        <activity android:name="com.facebook.FacebookActivity"
    android:configChanges=
            "keyboard|keyboardHidden|screenLayout|screenSize|orientation"
    android:label="@string/app_name" />
        <activity
            android:name="com.facebook.CustomTabActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />
                <data android:scheme="@string/fb_login_protocol_scheme" />
            </intent-filter>
        </activity>
    </application>
</manifest>

这是完整的错误:

Launching lib\main.dart on Redmi 5 in debug mode...
√ Built build\app\outputs\flutter-apk\app-debug.apk.
Installing build\app\outputs\flutter-apk\app.apk...                38.0s
E/AndroidRuntime(14356): FATAL EXCEPTION: main
E/AndroidRuntime(14356): Process: com.example.aol, PID: 14356
E/AndroidRuntime(14356): java.lang.RuntimeException: Unable to instantiate application com.example.aol.Application: java.lang.ClassNotFoundException: Didn't find class "com.example.aol.Application" on path: DexPathList[[zip file "/data/app/com.example.aol-1JWhf7hk26dkh1US0WG4tg==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.aol-1JWhf7hk26dkh1US0WG4tg==/lib/arm64, /data/app/com.example.aol-1JWhf7hk26dkh1US0WG4tg==/base.apk!/lib/arm64-v8a, /system/lib64, /system/vendor/lib64]]
E/AndroidRuntime(14356):    at android.app.LoadedApk.makeApplication(LoadedApk.java:993)
E/AndroidRuntime(14356):    at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5801)
E/AndroidRuntime(14356):    at android.app.ActivityThread.-wrap1(Unknown Source:0)
E/AndroidRuntime(14356):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1685)
E/AndroidRuntime(14356):    at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime(14356):    at android.os.Looper.loop(Looper.java:176)
/AndroidRuntime(14356):     at android.app.ActivityThread.main(ActivityThread.java:6651)
E/AndroidRuntime(14356):    at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(14356):    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
E/AndroidRuntime(14356):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824)
E/AndroidRuntime(14356): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.aol.Application" on path: DexPathList[[zip file "/data/app/com.example.aol-1JWhf7hk26dkh1US0WG4tg==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.aol-1JWhf7hk26dkh1US0WG4tg==/lib/arm64, /data/app/com.example.aol-1JWhf7hk26dkh1US0WG4tg==/base.apk!/lib/arm64-v8a, /system/lib64, /system/vendor/lib64]]
E/AndroidRuntime(14356):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:125)
E/AndroidRuntime(14356):    at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
E/AndroidRuntime(14356):    at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
E/AndroidRuntime(14356):    at android.app.Instrumentation.newApplication(Instrumentation.java:1088)
E/AndroidRuntime(14356):    at android.app.LoadedApk.makeApplication(LoadedApk.java:987)
E/AndroidRuntime(14356):    ... 9 more

Answer 1

我遇到了同样的错误。在我的例子中，Application.java 文件位于 main/java/ 下。我通过在 java 文件夹下创建另一个文件夹来解决它，并将应用程序文件放入其中，因此路径如下； main/java/your_folder_name/Application.java。不要忘记更新 AndroidManifest 文件中的新路径，这样它就变成了这样的:

.
.
.
<application
    <!--Here-->
    android:name=".your_folder_name.Application" 
    tools:replace="android:label"
    android:label="aol"
    android:icon="@mipmap/ic_launcher">

另一个原因，也可能是因为您的 Application.java 与您在 AndroidManifest 中指定的包不同。