java.lang.RuntimeException：无法实例化应用程序 com.todos.MyApplication：java.lang.ClassNotFoundException

Question

W/dalvikvm(21732): threadid=1: thread exiting with uncaught exception (group=0x41d0cda0)
E/Drive.UninstallOperation( 1829): Package still installed com.todos
E/AndroidRuntime(21732): FATAL EXCEPTION: main
E/AndroidRuntime(21732): Process: com.todos, PID: 21732
E/AndroidRuntime(21732): java.lang.RuntimeException: Unable to instantiate application com.todos.MyApplication: java.lang.ClassNotFoundException: Didn't find class "com.todos.MyApplication" on path: DexPathList[[zip file "/data/app/com.todos-3.apk"],nativeLibraryDirectories=[/data/app-lib/com.todos-3, /vendor/lib, /system/lib]]
E/AndroidRuntime(21732): at android.app.LoadedApk.makeApplication(LoadedApk.java:507)
E/AndroidRuntime(21732): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4841)
E/AndroidRuntime(21732): at android.app.ActivityThread.access$1600(ActivityThread.java:174)
E/AndroidRuntime(21732): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1381)
E/AndroidRuntime(21732): at android.os.Handler.dispatchMessage(Handler.java:102)
E/AndroidRuntime(21732): at android.os.Looper.loop(Looper.java:146)
E/AndroidRuntime(21732): at android.app.ActivityThread.main(ActivityThread.java:5731)
E/AndroidRuntime(21732): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(21732): at java.lang.reflect.Method.invoke(Method.java:515)
E/AndroidRuntime(21732): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
E/AndroidRuntime(21732): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
E/AndroidRuntime(21732): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(21732): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.todos.MyApplication" on path: DexPathList[[zip file "/data/app/com.todos-3.apk"],nativeLibraryDirectories=[/data/app-lib/com.todos-3, /vendor/lib, /system/lib]]
E/AndroidRuntime(21732): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:67)
E/AndroidRuntime(21732): at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
E/AndroidRuntime(21732): at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
E/AndroidRuntime(21732): at android.app.Instrumentation.newApplication(Instrumentation.java:981)
E/AndroidRuntime(21732): at android.app.LoadedApk.makeApplication(LoadedApk.java:502)
E/AndroidRuntime(21732): ... 11 more
W/ActivityManager(  757):   Force finishing activity com.todos/.MainActivity
W/DropBoxManagerService(  757): Dropping: data_app_crash (1781 > 0 bytes)

我的AndroidManifest 如下所示...

  <uses-permission android:name="android.permission.INTERNET" />
  <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>

  <uses-sdk
      android:minSdkVersion="16"
      android:targetSdkVersion="22" />

  <application
    android:allowBackup="true"
    android:label="@string/app_name"
    android:icon="@mipmap/ic_launcher"
    android:theme="@style/AppTheme"
    android:name="com.todos.MyApplication">


    <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/>

    <activity
      android:name=".MainActivity"
      android:label="@string/app_name"
      android:configChanges="keyboard|keyboardHidden|orientation|screenSize">
      <intent-filter>
          <action android:name="android.intent.action.MAIN" />
          <category android:name="android.intent.category.LAUNCHER" />
      </intent-filter>
    </activity>
    <activity android:name="com.facebook.react.devsupport.DevSettingsActivity" />
  </application>

当我添加 com.todos.MyApplication 源文件时，这开始出现问题...

当我在 Android Studio 中打开项目并导航到 MyApplication.java 时，我看到以下内容...

Answer 1

你还在面对这个问题吗？

我已经通过安装干净的 apk 解决了这个问题：

1. 先卸载之前安装的APK。
2. 然后运行以下命令：

cd android
./gradlew clean
react-native run-android

以上命令会先进入android文件夹，然后使用./gradlew clean清理文件夹，然后在项目根目录下重建react-native run-android命令。