Android-Read构建。类内的gradle属性

Question

我希望能够访问build.gradle属性，这样我就可以在我的应用程序中自动化一些流程。

这就是我目前的结构：

RootProject/build.gradle

buildscript {
    ext {
        buildTools = "25.0.2"
        minSdk = 16
        compileSdk = 23
        targetSdk = 23

        versions = [supportLib         : '25.0.0',
                    multidex           : '1.0.1',
                    playServices       : '10.0.1']
        libs = [appcompat            : "com.android.support:appcompat-v7:$versions.supportLib",
               design               : "com.android.support:design:$versions.supportLib"]

        .... Other libraries and setup....

    }
}

rootProject/app/build。格拉德尔

...
dependencies {
    // Support libraries
    compile libs.appcompat
    compile libs.design
    .....
}

我想访问Java和build。gradle端是属性版本和libs变量。我怎样才能做到这一点？

Answer 1

使用渐变。属性文件来定义您的值，然后您可以在gradle项目配置中使用此值。

然后，为了能够访问Java android代码中的这些值，请使用“buildConfigField”定义。

格拉德尔。性质

values=value1,value2

建筑格拉德尔

def String[] valuesArray = values.split(',')

android {
    defaultConfig {
        buildConfigField "String[]", "VALUES_ARRAY", "{" +
                "\"" + valuesArray[0] + "\"," +
                "\"" + valuesArray[1] + "\"" +
                "}"
    }
}

在java文件

BuildConfig.VALUES_ARRAY

Answer 2

您可以这样做，但是在构建脚本块之外

ext {
    // Version
    supportVersion = '26.0.0'

    // Support Libraries dependencies
    supportDependencies = [
            design:            "com.android.support:design:${supportVersion}",
            recyclerView:      "com.android.support:recyclerview-v7:${supportVersion}",
            cardView:          "com.android.support:cardview-v7:${supportVersion}",
            appCompat:         "com.android.support:appcompat-v7:${supportVersion}",
            supportAnnotation: "com.android.support:support-annotations:${supportVersion}",
    ]

    firebaseVersion = '11.0.2';

    firebaseDependencies = [
            core:         "com.google.firebase:firebase-core:${firebaseVersion}",
            database:     "com.google.firebase:firebase-database:${firebaseVersion}",
            storage:      "com.google.firebase:firebase-storage:${firebaseVersion}",
            crash:        "com.google.firebase:firebase-crash:${firebaseVersion}",
            auth:         "com.google.firebase:firebase-auth:${firebaseVersion}",
            messaging:    "com.google.firebase:firebase-messaging:${firebaseVersion}",
            remoteConfig: "com.google.firebase:firebase-config:${firebaseVersion}",
            invites:      "com.google.firebase:firebase-invites:${firebaseVersion}",
            adMod:        "com.google.firebase:firebase-ads:${firebaseVersion}",
            appIndexing:  "com.google.android.gms:play-services-appindexing:${firebaseVersion}",
    ];
}


// Module build file
dependencies {
    // ...
    compile supportDependencies.appCompat
    compile supportDependencies.design
    compile firebaseDependencies.crash
}

在java中，您无法访问构建。gradle文件，因为它们仅在构建时使用。您可以在BuildConfig文件中输入相同的值。在这个文件中有一些预构建的值，比如BuildConfig。VERSION_NAME或您可以使用一些自定义键，如：

android {
    ...
    defaultConfig {
        ...
        // defining the build date
        buildConfigField "long", "BUILD_DATE", System.currentTimeMillis() + "L"
        // define whether this build is a production build
        buildConfigField "boolean", "IS_PRODUCTION", "false"
        // note that to define a string you need to escape it
        buildConfigField "String", "API_KEY", "\"my_api_key\""
    }
}

自动生成的

public class BuildConfig {
    // ... other generated fields ...
    public static final long BUILD_DATE = 1469504547000L;
    public static final boolean IS_PRODUCTION = false;
    public static final String API_KEY = "my_api_key";
}