java.lang.ClassNotFoundException：在路径：DexPathList上找不到类“ eduapp.arg.MainApplication”

时间：2020-08-08 03:45:21

标签： java android react-native runtime-error expo

这是一个反应本机应用程序，首先使用expo创建，然后弹出。当我要执行构建时，它不会给出任何错误，但是在安装和运行时会崩溃，该应用程序永远不会总是关闭并显示错误。

使用adb logcat工具查看电话日志并向我显示：

Unable to instantiate application eduapp.arg.MainApplication: java.lang.ClassNotFoundException: Didn't find class "eduapp.arg.MainApplication" on path: DexPathList 

08-07 02:32:48.585 10182 10182 E AndroidRuntime: FATAL EXCEPTION: main
08-07 02:32:48.585 10182 10182 E AndroidRuntime: Process: eduapp.arg, PID: 10182
08-07 02:32:48.585 10182 10182 E AndroidRuntime: java.lang.RuntimeException: Unable to instantiate application eduapp.arg.MainApplication: java.lang.ClassNotFoundException: Didn't find class "eduapp.arg.MainApplication" on path: DexPathList[[zip file "/data/app/eduapp.arg-FAa3-QgPlP0Ej-TLlvTegw==/base.apk"],nativeLibraryDirectories=[/data/app/eduapp.arg-FAa3-QgPlP0Ej-TLlvTegw==/lib/arm64, /data/app/eduapp.arg-FAa3-QgPlP0Ej-TLlvTegw==/base.apk!/lib/arm64-v8a, /system/lib64]]
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at android.app.LoadedApk.makeApplication(LoadedApk.java:1073)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5920)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at android.app.ActivityThread.access$1200(ActivityThread.java:200)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1673)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at android.os.Handler.dispatchMessage(Handler.java:106)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at android.os.Looper.loop(Looper.java:201)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at android.app.ActivityThread.main(ActivityThread.java:6810)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at java.lang.reflect.Method.invoke(Native Method)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
08-07 02:32:48.585 10182 10182 E AndroidRuntime: Caused by: java.lang.ClassNotFoundException: Didn't find class "eduapp.arg.MainApplication" on path: DexPathList[[zip file "/data/app/eduapp.arg-FAa3-QgPlP0Ej-TLlvTegw==/base.apk"],nativeLibraryDirectories=[/data/app/eduapp.arg-FAa3-QgPlP0Ej-TLlvTegw==/lib/arm64, /data/app/eduapp.arg-FAa3-QgPlP0Ej-TLlvTegw==/base.apk!/lib/arm64-v8a, /system/lib64]]
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at android.app.AppComponentFactory.instantiateApplication(AppComponentFactory.java:50)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at androidx.core.app.CoreComponentFactory.instantiateApplication(CoreComponentFactory.java:47)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at android.app.Instrumentation.newApplication(Instrumentation.java:1121)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        at android.app.LoadedApk.makeApplication(LoadedApk.java:1065)
08-07 02:32:48.585 10182 10182 E AndroidRuntime:        ... 9 more
08-07 02:32:48.591  2038  3384 W ActivityManager:   Force finishing activity eduapp.arg/.MainActivity

Adb Log

在这里，我离开了Android Manifest.xml 

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="eduapp.arg">
  <uses-permission android:name="android.permission.INTERNET"/>
  <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
  <uses-permission android:name="android.permission.MANAGE_DOCUMENTS"/>
  <uses-permission android:name="android.permission.READ_INTERNAL_STORAGE"/>
  <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
  <uses-permission android:name="android.permission.USE_FINGERPRINT"/>
  <uses-permission android:name="android.permission.VIBRATE"/>
  <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>
  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
  <uses-permission android:name="android.permission.CAMERA"/>
  <uses-permission android:name="android.permission.READ_CONTACTS"/>
  <uses-permission android:name="android.permission.READ_CALENDAR"/>
  <uses-permission android:name="android.permission.WRITE_CALENDAR"/>
  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
  <uses-permission android:name="android.permission.RECORD_AUDIO"/>
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
  <uses-permission android:name="android.permission.WRITE_SETTINGS"/>
  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
  <uses-permission android:name="android.permission.WAKE_LOCK"/>
  <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE"/>
  <application android:name=".MainApplication" android:label="@string/app_name" android:icon="@mipmap/ic_launcher" android:roundIcon="@mipmap/ic_launcher_round" android:allowBackup="false" android:theme="@style/AppTheme">
    <meta-data android:name="expo.modules.updates.EXPO_UPDATE_URL" android:value="YOUR-APP-URL-HERE"/>
    <meta-data android:name="expo.modules.updates.EXPO_SDK_VERSION" android:value="37.0.0"/>
    <meta-data android:name="expo.modules.updates.ENABLED" android:value="true"/>
    <meta-data android:name="expo.modules.updates.EXPO_UPDATES_CHECK_ON_LAUNCH" android:value="ALWAYS"/>
    <meta-data android:name="expo.modules.updates.EXPO_UPDATES_LAUNCH_WAIT_MS" android:value="0"/>
    <activity android:name=".MainActivity" android:label="@string/app_name" android:configChanges="keyboard|keyboardHidden|orientation|screenSize" android:launchMode="singleTask" android:windowSoftInputMode="adjustResize" android:theme="@style/Theme.App.SplashScreen" android:screenOrientation="portrait">
      <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"/>
    <activity
      android:name="com.theartofdev.edmodo.cropper.CropImageActivity"
      android:theme="@style/Base.Theme.AppCompat">
    </activity>
  </application>
</manifest>

AndroidManifest

这是MainApplication.java 

package com.frontendeduapp;

import android.app.Application;
import android.content.Context;
import android.net.Uri;

import com.facebook.react.PackageList;
import com.facebook.react.ReactApplication;
import com.facebook.react.ReactNativeHost;
import com.facebook.react.ReactPackage;
import com.facebook.react.shell.MainReactPackage;
import com.facebook.soloader.SoLoader;
import com.facebook.react.BuildConfig;
import com.frontendeduapp.generated.BasePackageList;

import org.unimodules.adapters.react.ReactAdapterPackage;
import org.unimodules.adapters.react.ModuleRegistryAdapter;
import org.unimodules.adapters.react.ReactModuleRegistryProvider;
import org.unimodules.core.interfaces.Package;
import org.unimodules.core.interfaces.SingletonModule;
import expo.modules.constants.ConstantsPackage;
import expo.modules.permissions.PermissionsPackage;
import expo.modules.filesystem.FileSystemPackage;
import expo.modules.updates.UpdatesController;

import java.lang.reflect.InvocationTargetException;
import java.util.Arrays;
import java.util.List;
import javax.annotation.Nullable;

public class MainApplication extends Application implements ReactApplication {
  private final ReactModuleRegistryProvider mModuleRegistryProvider = new ReactModuleRegistryProvider(
    new BasePackageList().getPackageList()
  );

  private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
    @Override
    public boolean getUseDeveloperSupport() {
      return BuildConfig.DEBUG;
    }

    @Override
    protected List<ReactPackage> getPackages() {
      List<ReactPackage> packages = new PackageList(this).getPackages();
      packages.add(new ModuleRegistryAdapter(mModuleRegistryProvider));
      return packages;
    }

    @Override
    protected String getJSMainModuleName() {
      return "index";
    }

    @Override
    protected @Nullable String getJSBundleFile() {
      if (BuildConfig.DEBUG) {
        return super.getJSBundleFile();
      } else {
        return UpdatesController.getInstance().getLaunchAssetFile();
      }
    }

    @Override
    protected @Nullable String getBundleAssetName() {
      if (BuildConfig.DEBUG) {
        return super.getBundleAssetName();
      } else {
        return UpdatesController.getInstance().getBundleAssetName();
      }
    }
  };

  @Override
  public ReactNativeHost getReactNativeHost() {
    return mReactNativeHost;
  }

  @Override
  public void onCreate() {
    super.onCreate();
    SoLoader.init(this, /* native exopackage */ false);
    initializeFlipper(this); // Remove this line if you don't want Flipper enabled

    if (!BuildConfig.DEBUG) {
      UpdatesController.initialize(this);
    }
  }

  /**
   * Loads Flipper in React Native templates.
   *
   * @param context
   */
  private static void initializeFlipper(Context context) {
    if (BuildConfig.DEBUG) {
      try {
        /*
         We use reflection here to pick up the class that initializes Flipper,
        since Flipper library is not available in release mode
        */
        Class<?> aClass = Class.forName("com.facebook.flipper.ReactNativeFlipper");
        aClass.getMethod("initializeFlipper", Context.class).invoke(null, context);
      } catch (ClassNotFoundException e) {
        e.printStackTrace();
      } catch (NoSuchMethodException e) {
        e.printStackTrace();
      } catch (IllegalAccessException e) {
        e.printStackTrace();
      } catch (InvocationTargetException e) {
        e.printStackTrace();
      }
    }
  }
}

如果您想查看完整的项目，请离开github链接。

https://github.com/SasePriv/FrontEnd-EduApp/tree/expo-eject

1 个答案:

答案 0 :(得分：1)

从日志中：Unable to instantiate application eduapp.arg.MainApplication: java.lang.ClassNotFoundException: Didn't find class "eduapp.arg.MainApplication" on path

在Android Developer docs中，AndroidManifest中package属性的用途之一是：

...to resolve any relative class names that are declared in the manifest file.
For example, if package is set to "com.example.myapp", an activity declared as <activity android:name=".MainActivity"> is resolved to be com.example.myapp.MainActivity

因此，您的MainApplication位于软件包com.frontendeduapp中，但是您在AndroidManifest中将该软件包定义为eduapp.arg。因此，现在在构建应用程序时，package的值用于将您的亲戚.MainApplication变成eduapp.arg.MainApplication，而实际上应该是com.frontendeduapp.MainApplication。

解决方案是在AndroidManifest中将eduapp.arg替换为com.frontendeduapp，然后重新构建。

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