使用Android Studio打包指定名称的Apk

在网上找了一些，很多都有错误，因为没有研究过gradle的语法，下面给出一个可用的方法，在build.gradle(module:app)中的android中添加：

android.applicationVariants.all { variant ->
        variant.outputs.all { output ->
            def outputFile = output.outputFile
            if (outputFile != null && outputFile.name.endsWith('.apk')) {
                outputFileName = "MyApk" + "_" + releaseTime() + ".apk"
            }
        }
    }

其中在gradle文件最外层中定义releaseTime()方法(当然也可以不要这个数据，可根据自己的规则命名)：

def releaseTime() {
    return new Date().format("yyyyMMdd", TimeZone.getTimeZone("UTC"))
}

比如这样一个完整的gradle文件如下：

apply plugin: 'com.android.application'

def releaseTime() {
    return new Date().format("yyyyMMdd", TimeZone.getTimeZone("UTC"))
}

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "cn.readsense.fx1000_sample"
        minSdkVersion 21
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        externalNativeBuild {
            cmake {
                cppFlags "-std=c++11"
            }
        }
        ndk {
            abiFilters 'armeabi-v7a'
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    sourceSets {
        main {
            jniLibs.srcDirs = ['libs']
        }
    }

    android.applicationVariants.all { variant ->
        variant.outputs.all { output ->
            def outputFile = output.outputFile
            if (outputFile != null && outputFile.name.endsWith('.apk')) {
                outputFileName = "MyApk" + "_" + releaseTime() + ".apk"
            }
        }
    }
}

tasks.withType(JavaCompile) {
    options.encoding = "UTF-8"
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

}