1.build.gradle:buildTypes {release {minifyEnabledtrueshrinkResourcestruePRoguardFiles getDefaultProguardFile('proguard-android-optimize.txt'),'proguard-rules.pro'signingConfig signingConfigs.SginConfig}}2.proguard-rules.pro-assumenosideeffectsclassandroid.util.Log{publicstatic boolean isLoggable(java.lang.String,int);publicstatic int v(...);publicstatic int i(...);publicstatic int w(...);publicstatic int d(...);publicstatic int e(...);}