release模式配置keystore

我们点击Project Structure

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点击我们项目的model，选择Signing选项

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使得签名生效需配置Build Types

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apply plugin: 'com.android.application'
android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.zxn.gaode"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    signingConfigs {
        release {
            keyAlias 'mgddkeystore'
            keyPassword 'mgdd888'
            storeFile file('D:/MyGitHubDemos/MyGaoDe-asp/MyGaoDeDemo/mgdd.jks')
            storePassword 'mgdd888'
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            signingConfig signingConfigs.release
        }
    }
}
dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}

签名文件的密码信息配置在local.properties

上述的配置简单实用，但是不安全，假如你的项目是开源的，你把签名文件的配置密码之类的信息用明文写在build.gradle里面，不够安全
可以将签名文件的配置密码之类的信息写在local.properties下，因为在Git版本控制的项目中，我们可以看到我们项目project模式根目录下有一个.gitignore的文件，里面的配置大概如下所示

*.iml
.gradle
/local.properties
/.idea/libraries
/.idea/modules.xml
/.idea/workspace.xml
.DS_Store
/build
/captures
.externalNativeBuild

其中我们可以看到/local.properties，意思就是说local.properties默认是不添加到版本控制里面的，因为local.properties存储的是我们环境资源的一些相关信息，如sdk的路径。故我们可以在local.properties下配置签名信息而不用担心密钥外泄。对于开源项目来说，是非常好的。
在local.properties下直接添加相关信息

## This file must *NOT* be checked into Version Control Systems,
# as it contains information specific to your local configuration.
#
# Location of the SDK. This is only used by Gradle.
# For customization when using a Version Control System, please read the
# header note.
#Sat Apr 21 12:17:45 CST 2018
ndk.dir=C\:\\MyPrograms\\Android\\sdkAS\\ndk-bundle
sdk.dir=C\:\\MyPrograms\\Android\\sdkAS
#keystore.path= D\:/MyGitHubDemos/MyGaoDe-asp/MyGaoDeDemo/mgdd.jks
KEY_ALIAS = mgddkeystore
STORE_PASSWORD = mgdd888
KEY_PASSWORD = mgdd888

为了不用明文显示，app的build.gradle里配置

apply plugin: 'com.android.application'
android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.zxn.gaode"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    signingConfigs {
        release {
            Properties properties = new Properties();
            properties
                    .load(project.rootProject.file("local.properties")
                    .newDataInputStream())
            storePassword properties.get("STORE_PASSWORD")
            keyAlias properties.get("KEY_ALIAS")
            keyPassword properties.get("KEY_PASSWORD")
            storeFile file('D:/MyGitHubDemos/MyGaoDe-asp/MyGaoDeDemo/mgdd.jks')
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            signingConfig signingConfigs.release
        }
    }
}
dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}

Signing中keystore值不设置

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到此，配置完成
我们在工程进行编译打包

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