Build.VERSION.SDK_INT? ?代表的操作系統的版本號 ，谷歌的解釋大致翻譯如下

當前在此硬件上運行的軟件的SDK版本裝置。當設備啟動時，此值從不更改，但它可能當硬件制造商提供OTA更新時增加。

常用來判斷sdk版本如下

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
}

后面的版本號，可以鼠標放到上面 +ctrl 按鍵就可以看到如下圖

從源碼里面看到當前有所的sdk 版本號

public static class VERSION_CODES {public static final int BASE = 1;public static final int BASE_1_1 = 2;public static final int CUPCAKE = 3;public static final int CUR_DEVELOPMENT = 10000;public static final int DONUT = 4;public static final int ECLAIR = 5;public static final int ECLAIR_0_1 = 6;public static final int ECLAIR_MR1 = 7;public static final int FROYO = 8;public static final int GINGERBREAD = 9;public static final int GINGERBREAD_MR1 = 10;public static final int HONEYCOMB = 11;public static final int HONEYCOMB_MR1 = 12;public static final int HONEYCOMB_MR2 = 13;public static final int ICE_CREAM_SANDWICH = 14;public static final int ICE_CREAM_SANDWICH_MR1 = 15;public static final int JELLY_BEAN = 16;public static final int JELLY_BEAN_MR1 = 17;public static final int JELLY_BEAN_MR2 = 18;public static final int KITKAT = 19;public static final int KITKAT_WATCH = 20;public static final int LOLLIPOP = 21;public static final int LOLLIPOP_MR1 = 22;public static final int M = 23;public static final int N = 24;public static final int N_MR1 = 25;public static final int O = 26;public static final int O_MR1 = 27;public static final int P = 28;public VERSION_CODES() {throw new RuntimeException("Stub!");}}

?

總結

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