从中删除不需要的库
build.gradle，
compile fileTree(dir: 'libs', include: ['*.jar'])androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { exclude group: 'com.android.support', module: 'support-annotations'})testCompile 'junit:junit:4.12'并且
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
