综上所述，以下是我用来检测设备是否有Froyo或更新的Android OS(2.2+)的代码:

public static boolean froyoOrNewer() {
    // SDK_INT is introduced in 1.6 (API Level 4) so code referencing that would fail
    // Also we can't use SDK_INT since some modified ROMs play around with this value, RELEASE is most versatile variable
    if (android.os.Build.VERSION.RELEASE.startsWith("1.") ||
        android.os.Build.VERSION.RELEASE.startsWith("2.0") ||
        android.os.Build.VERSION.RELEASE.startsWith("2.1"))
        return false;

    return true;
}

显然，如果你需要通用的检查器，你可以修改if条件来考虑1.0和1.5版本的Android。你可能会得到这样的结果:

// returns true if current Android OS on device is >= verCode 
public static boolean androidMinimum(int verCode) {
    if (android.os.Build.VERSION.RELEASE.startsWith("1.0"))
        return verCode == 1;
    else if (android.os.Build.VERSION.RELEASE.startsWith("1.1")) {
        return verCode <= 2;
    } else if (android.os.Build.VERSION.RELEASE.startsWith("1.5")) {
        return verCode <= 3;
    } else {
        return android.os.Build.VERSION.SDK_INT >= verCode;
    }
}

如果代码不适合你，请告诉我。

如Android文档中所述，手机正在运行的SDK级别(整数)可在:

android.os.Build.VERSION.SDK_INT

这个int对应的类在android.os.Build中。VERSION_CODES类。

代码示例:

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP){
    // Do something for lollipop and above versions
} else{
    // do something for phones running an SDK before lollipop
}

编辑:这个SDK_INT从Donut (android 1.6 / API4)开始就可用了，所以请确保您的应用程序在使用它时不与Cupcake (android 1.5 / API3)向后兼容，否则您的应用程序将崩溃(感谢程序员Bruce的精度)。

对应的android文档在这里和这里

我改进了我使用的代码

public static float getAPIVerison() {

    float f=1f;
    try {
        StringBuilder strBuild = new StringBuilder();
        strBuild.append(android.os.Build.VERSION.RELEASE.substring(0, 2));
        f= Float.valueOf(strBuild.toString());
    } catch (NumberFormatException e) {
        Log.e("myApp", "error retriving api version" + e.getMessage());
    }

    return f;
}

试试这个:

 if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.GINGERBREAD) {
     // only for gingerbread and newer versions
 }

明白了。它使用Context类的getApplicationInfo()方法。

我更喜欢把版本作为数字来处理，而不是这样写:

  public static float getAPIVerison() {

    Float f = null;
    try {
        StringBuilder strBuild = new StringBuilder();
        strBuild.append(android.os.Build.VERSION.RELEASE.substring(0, 2));
        f = new Float(strBuild.toString());
    } catch (NumberFormatException e) {
        Log.e("", "error retriving api version" + e.getMessage());
    }

    return f.floatValue();
}