报错：
Error:Error converting bytecode to dex:
Cause: Dex cannot parse version 52 byte code.
This is caused by library dependencies that have been compiled using Java 8 or above.
If you are using the 'java' gradle plugin in a library submodule add
targetCompatibility = '1.7'
sourceCompatibility = '1.7'
to that submodule's build.gradle file.
解决办法：在app的gradle里添加如下两个语句
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
//添加
dexOptions {
preDexLibraries false
jumboMode true
javaMaxHeapSize "2g"
incremental false
}
}
//添加
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_7
targetCompatibility JavaVersion.VERSION_1_7
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