检测Android N 版本代码

Question

是否可以检测用户是否运行 Android N？

我有一个带有 Android N Developer Preview 的 Nexus 6。如果我尝试使用 Build.VERSION.SDK_INT 获取构建版本，它 returns 23 等于 Android Marshmallow.

Answer 1

引用 myself:

Following the approach that Google used for the M Developer Preview, you can check Build.VERSION.CODENAME instead:

public static boolean iCanHazN() {
  return("N".equals(Build.VERSION.CODENAME));
}

我没有看过 Build.VERSION.RELEASE，正如 zgc7009 的评论所建议的，尽管这也有可能。

此外，如果您是从遥远的未来阅读本文，其中 Android N 已经以最终形式发布，您应该能够使用 Build.VERSION.SDK_INT 和 Build.VERSION_CODES.N。上述 hack 是由于 Google 处理这些开发人员预览的方式的特殊性。

Answer 2

我建议使用 Integer 值来检查 Android 版本而不是 String

public boolean isAndroidN() {
        return Build.VERSION.SDK_INT == Build.VERSION_CODES.N;
    }

请记住，在 manifests.xml 中必须将 compileSdkVersion 设置为 24 或更高：

compileSdkVersion 24

Answer 3

方法 1：（推荐）使用支持库 android.support.v4.os.BuildCompat.isAtLeastN。

方法 2：使用此作为 "real" 版本代码：Build.VERSION.SDK_INT < 23 || Build.VERSION.PREVIEW_SDK_INT == 0 ? Build.VERSION.SDK_INT : Build.VERSION.SDK_INT + 1.

Answer 4

我发现 Build.VERSION.RELEASE 和 Build.VERSION.CODENAME 的行为完全不同，具体取决于它是 Android OS 的完整生产版本还是开发人员预览版。我们采用了以下机制。如果你想考虑不止一种情况，你不能只依赖一个值。

这就是我发现的 Galaxy S7 运行 Nougat 生产版本和 Nexus 5X 运行 O DP1 的情况。

银河 S7 牛轧糖 Build.VERSION.BASE_OS: Build.VERSION.CODENAME:相对 Build.VERSION.INCREMENTAL：G930FXXU1DQB3 Build.VERSION.PREVIEW_SDK_INT: 0 Build.VERSION.RELEASE：7.0 Build.VERSION.SDK_INT: 24 Build.VERSION.SECURITY_PATCH: 2017-01-01

Nexus 5X O Build.VERSION.BASE_OS: Build.VERSION.CODENAME：哦 Build.VERSION.INCREMENTAL：3793265 Build.VERSION.PREVIEW_SDK_INT: 1 Build.VERSION.RELEASE：哦 Build.VERSION.SDK_INT: 25 Build.VERSION.SECURITY_PATCH: 2017-03-05

// release builds of Android (i.e. not developer previews) have a CODENAME value of "REL"
    // check this. if it's REL then you can rely on value of SDK_INT (SDK_INT is inaccurate for DPs
    // since it has the same value as the previous version of Android)
    // if it's not REL, check its value. it will have a letter denoting the Android version (N for Nougat, O for... er... O and so on)

    boolean laterThanNougat = false;

    if(Build.VERSION.CODENAME.equals("REL")) {
        Log.i(TAG, "This is a release build");

        // since this is a release build, we can rely on value of SDK_INT
        if (android.os.Build.VERSION.SDK_INT > 25) {
            Log.i(TAG, "This is later than Nougat");
            laterThanNougat = true;
        } else {
            Log.i(TAG, "This is Nougat or before");
        }
    } else {
        Log.i(TAG, "This is NOT a release build");

        // since this is not a release build, we can't rely on value of SDK_INT. must check codename again
        if(Build.VERSION.CODENAME.compareTo("N") > 0) {
            Log.i(TAG, "This is later than Nougat");
            laterThanNougat = true;
        } else {
            Log.i(TAG, "This is Nougat or before");
        }
    }

检测Android N 版本代码

Detect Android N version code

android

android-7.0-nougat