Android UNEXPECTED TOP-LEVEL EXCEPTION

1. The first time I encountered this error was added in build.gradle

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

 

The reason is that Android now only supports language features up to jdk7

see

Which JDK version (Language Level) is required for Android Studio?

Is it possible to use Java 8 for Android development?

 

The solution is also very simple: remove this paragraph directly, or reduce the version to 1.7

sourceCompatibility = JavaVersion.VERSION_1_7
targetCompatibility = JavaVersion.VERSION_1_7

 see 

Lambda expressions in android

UNEXPECTED TOP-LEVEL EXCEPTION adding new Module to Android Studio project

 

If you must use the new features of java8, you can refer to an open source project on github

gradle-retrolambda

 

Of course, the error may also be resolved at some stage when Google decides to support jdk8

 

 2. There may also be a jar conflict

For example, both v4 and v7 android support are set in the dependency

Android Studio - UNEXPECTED TOP-LEVEL EXCEPTION

 

For example, Umeng's message push jar conflicts with Alipay SDK

Conflict between push components and Alipay SDK

 

For example, Umeng's social component (sharing) SDK conflicts with WeChat's native SDK

Unable to execute dex: Multiple dex files define

(Note: It should be either SocialSDK_WeiXin_1.jar or libammsdk.jar now)