platforms/android-28/android.jar

替换sdk路径下/platforms/android-28/android.jar，能够解决在android studio 看源码部分类报红及能够正常编译项目。解决替换as后报错：Failed to transform file 'android.jar' to match attributes {artifactType=android-mockable-jar, returnDefaultValues=false} using transform MockableJarTransform