signingConfigs {  
        release {  //加
            storeFile file(MYAPP_RELEASE_STORE_FILE)   //加
            storePassword MYAPP_RELEASE_STORE_PASSWORD   //加
            keyAlias MYAPP_RELEASE_KEY_ALIAS   //加
            keyPassword MYAPP_RELEASE_KEY_PASSWORD   //加
        }   //加
    }
    splits {
        abi {
            reset()
            enable enableSeparateBuildPerCPUArchitecture
            universalApk false  // If true, also generate a universal APK
            include "armeabi-v7a", "x86"
        }
    }
    buildTypes {
        release {
            minifyEnabled enableProguardInReleaseBuilds
            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
            signingConfig signingConfigs.release  //加
        }
    }