Kotlin单层

val versionCode = BuildConfig.VERSION_CODE
val versionName = BuildConfig.VERSION_NAME

Java一行程序

String versionCode = String.valueOf(BuildConfig.VERSION_CODE);
String versionName = String.valueOf(BuildConfig.VERSION_NAME);

确保将BuildConfig导入到类中。

对构建系统有用：有一个用APK文件生成的文件，名为output.json，其中包含每个生成的APK文件的一系列信息，包括versionName和versionCode。

例如

[
    {
        "apkInfo": {
            "baseName": "x86-release",
            "enabled": true,
            "filterName": "x86",
            "fullName": "86Release",
            "outputFile": "x86-release-1.0.apk",
            "splits": [
                {
                    "filterType": "ABI",
                    "value": "x86"
                }
            ],
            "type": "FULL_SPLIT",
            "versionCode": 42,
            "versionName": "1.0"
        },
        "outputType": {
            "type": "APK"
        },
        "path": "app-x86-release-1.0.apk",
        "properties": {}
    }
]

private String GetAppVersion() {
    try {
        PackageInfo _info = mContext.getPackageManager().getPackageInfo(mContext.getPackageName(), 0);
        return _info.versionName;
    }
    catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
        return "";
    }
}

private int GetVersionCode() {
    try {
        PackageInfo _info = mContext.getPackageManager().getPackageInfo(mContext.getPackageName(), 0);
        return _info.versionCode;
    }
    catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
        return -1;
    }
}

对于Xamarin用户，使用此代码获取版本名称和代码

版本名称：公共字符串getVersionName（）{return Application.Context.ApplicationContext.BackageManager.GetPackageInfo（Application.Context.ApplicationContext.PackageName，0）.VersionName；}版本代码：公共字符串getVersionCode（）{return Application.Context.ApplicationContext.BackageManager.GetPackageInfo（Application.Context.ApplicationContext.PackageName，0）.VersionCode；}

Kotlin示例：

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.act_signin)

    packageManager.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES).apply {
        findViewById<TextView>(R.id.text_version_name).text = versionName
        findViewById<TextView>(R.id.text_version_code).text =
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) "$longVersionCode" else "$versionCode"
    }

    packageManager.getApplicationInfo(packageName, 0).apply{
        findViewById<TextView>(R.id.text_build_date).text =
            SimpleDateFormat("yy-MM-dd hh:mm").format(java.io.File(sourceDir).lastModified())
    }
}

使用BuildConfig类：

String versionName = BuildConfig.VERSION_NAME;
int versionCode = BuildConfig.VERSION_CODE;

文件build.gradle（应用程序）

defaultConfig {
    applicationId "com.myapp"
    minSdkVersion 19
    targetSdkVersion 27
    versionCode 17
    versionName "1.0"
}