Android-阅读类中的build.gradle属性 [英] Android - Read build.gradle properties inside class

问题描述

我想访问build.gradle属性，以便可以自动执行我的应用程序中的某些过程.

I would like to have access to build.gradle properties so I can automatize some processes in my app.

这是我目前的结构:

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.gradle

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

我想同时在Java和build.gradle端访问属性 版本 和 libs .我该如何实现?

I would like to access both on Java and build.gradle side the properties version and libs variables. How can I achieve this?

推荐答案

您可以执行类似的操作，但是在外部 buildscript块

You can do somenthing like this, but outside the buildscript block

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build.gradle文件，因为它们仅在构建时使用.但是，您可以将相同的值放在BuildConfig文件中.在此文件中，有一些预构建的值，例如BuildConfig.VERSION_NAME，或者您可以使用一些自定义键，例如:

In java you can't access the build.gradle files since they are used only at buildtime. Hovewer you can put same values in the BuildConfig file. In this file there are some prebuilt values like BuildConfig.VERSION_NAME or you can use some custom keys like:

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\""
    }
}

根据上面的指令，自动生成的<package_name>.BuildConfig.java将包含以下字段:

The automatically-generated <package_name>.BuildConfig.java will contain the following fields based on the directive above:

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";
}

这篇关于Android-阅读类中的build.gradle属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！