Trying to add MultiDex support - cannot find symbol context and MultiDex

问题:

After following the instructions mentioned at: https://developer.android.com/studio/build/multidex.html#mdex-gradle

I am getting an error cannot find symbol class Context variable context and variable MultiDex.

package com.mycompany.mypackage;  import android.app.Application; import android.util.Log;  import com.facebook.react.ReactApplication; import com.slowpath.hockeyapp.RNHockeyAppModule; import com.slowpath.hockeyapp.RNHockeyAppPackage; import com.microsoft.codepush.react.CodePush; import com.facebook.react.ReactInstanceManager; import com.facebook.react.ReactNativeHost; import com.facebook.react.ReactPackage; import com.facebook.react.shell.MainReactPackage;  import com.sbugert.rnadmob.RNAdMobPackage;  import com.lugg.ReactNativeConfig.ReactNativeConfigPackage;  import com.geektime.reactnativeonesignal.ReactNativeOneSignalPackage; import com.dieam.reactnativepushnotification.ReactNativePushNotificationPackage;  import com.reactnative.ivpusic.imagepicker.PickerPackage;  import com.github.xinthink.rnmk.ReactMaterialKitPackage;  import com.learnium.RNDeviceInfo.RNDeviceInfo;  import com.burnweb.rnpermissions.RNPermissionsPackage;  import net.zubricky.AndroidKeyboardAdjust.AndroidKeyboardAdjustPackage;  // react-native-fbsdk import com.facebook.CallbackManager; import com.facebook.FacebookSdk; import com.facebook.reactnative.androidsdk.FBSDKPackage; import com.facebook.appevents.AppEventsLogger; // react-native-fbads import io.callstack.react.fbads.FBAdsPackage;  import java.util.Arrays; import java.util.List;  public class MainApplication extends Application implements ReactApplication {   @Override   protected void attachBaseContext(Context base) {      super.attachBaseContext(context);      MultiDex.install(this);   }     // react-native-fbsdk   private static CallbackManager mCallbackManager = CallbackManager.Factory.create();   protected static CallbackManager getCallbackManager() {     return mCallbackManager;   }   @Override   public void onCreate() {     super.onCreate();     FacebookSdk.sdkInitialize(getApplicationContext());     // If you want to use AppEventsLogger to log events.     AppEventsLogger.activateApp(this);   }    private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {      @Override     protected String getJSBundleFile() {       return CodePush.getJSBundleFile();     }      @Override     protected boolean getUseDeveloperSupport() {       return BuildConfig.DEBUG;     }      @Override     protected List<ReactPackage> getPackages() {       return Arrays.<ReactPackage>asList(           new MainReactPackage(),           new RNHockeyAppPackage(MainApplication.this),           new CodePush("mykey", MainApplication.this, BuildConfig.DEBUG),           new ReactNativeConfigPackage(),           new ReactNativeOneSignalPackage(),           new ReactNativePushNotificationPackage(),           new RNAdMobPackage(),           new PickerPackage(),           new ReactMaterialKitPackage(),           new RNDeviceInfo(),           new RNPermissionsPackage(),           new AndroidKeyboardAdjustPackage(),           new FBSDKPackage(mCallbackManager),           new FBAdsPackage()       );     }    };    @Override   public ReactNativeHost getReactNativeHost() {       return mReactNativeHost;   } } 

build.gradle

dependencies {     compile project(':react-native-device-info')     compile project(':react-native-hockeyapp')     compile project(':react-native-code-push')     compile project(':react-native-image-crop-picker')     compile project(':react-native-vector-icons')     compile project(':react-native-material-kit')     compile project(':react-native-config')     compile project(':RNAdMob')     compile project(':react-native-onesignal')     compile project(':react-native-push-notification')     compile project(':RNPermissionsModule')     compile project(':react-native-android-keyboard-adjust')     compile project(':react-native-fbsdk')     compile(project(':react-native-fbads')) {       exclude group: "com.google.android.gms"     }     compile 'com.google.firebase:firebase-core:10.2.0'     compile 'com.google.firebase:firebase-crash:10.2.0'     compile 'com.google.firebase:firebase-ads:10.2.0'      compile fileTree(dir: "libs", include: ["*.jar"])     compile "com.android.support:appcompat-v7:23.0.1"     compile "com.facebook.react:react-native:+"  // From node_modules     compile "com.facebook.fresco:animated-gif:0.12.0"     compile 'com.android.support:multidex:1.0.1' } 

Is there something I have to add or import to get this to work?

回答1:

Thanks to @Gabe Sechan for the help. I know React Native/JavaScript, kind of clueless about Android/Java, so I simply followed the instructions at https://developer.android.com/studio/build/multidex.html#mdex-gradle, which did not mention any additional imports. I learned to look up the package I needed here: https://developer.android.com/reference/android/support/multidex/MultiDexApplication.html. After adding:

import android.support.multidex.MultiDexApplication;  public class MainApplication extends MultiDexApplication implements ReactApplication { ... 

App seems to build and run successfully on Android 4.4.4+ devices. On my Samsung Galaxy S3 simulator running 4.3 however, I am getting a crash upon app start: What does WIN DEATH: android.osDeadObjectException mean?, which seems like another issue altogether.

文章来源: Trying to add MultiDex support - cannot find symbol context and MultiDex