。getWindow（）hasFeature（）API上的LT＆; 11 [英] getWindow().hasFeature() on API < 11

问题描述

我需要检查，如果叠加功能已经上 ActionBarCompat 实例设置。在 getWindow（）。hasFeature（）方法仅适用于API 11及以上可用。

I need to check if the overlay feature has been set on an ActionBarCompat instance. The getWindow().hasFeature() method is only available on API 11 and up.

我如何检查API＆LT的功能; 11？

How can I check the feature on API < 11 ?

编辑：基于注释，在 getFeatures 方法应可从API 1，但它是受保护的范围，我需要访问从另一个类的功能。在 hasFeature 方法，一个我需要使用，而另一方面是API 11及以上而已。这是Android的工作室展示了我和2.3.3设备上的应用程序崩溃。

Based on the comment, the getFeatures method should be available from API 1 but it is protected scope and I need to access the feature from another class. The hasFeature method, the one I need to use, on the other hand is API 11 and above only. This is what Android Studio shows me and the app crashes on a 2.3.3 device.

仅供参考，这里使用的活动类是从ActionBarCompat库扩展 ActionBarActivity 自定义类。不知道是不是应该有所作为。

FYI, the activity class used here is a custom class that extends ActionBarActivity from the ActionBarCompat library. Don't know if that should make a difference.

推荐答案

您可以使用的私人方法=htt​​p://docs.oracle.com / JavaSE的/教程/体现/相对=nofollow>反射API 。

You can access private methods using The Reflection API.

boolean hasFeature(int feature) {
    Window window = getWindow(); //get the window instance.
    if (android.os.Build.VERSION.SDK_INT >= 11) { // if we are running api level 11 and later
        return window.hasFeature(feature); //call hasFeature
    } else {
        try {
            Class c = window.getClass();
            Method getFeatures = c.getDeclaredMethod("getFeatures");//get the getFeatures method using reflection
            getFeatures.setAccessible(true);//make it public
            Integer features = getFeatures.invoke(window, null); //invoke it
            return (features.intValue() & (1 << feature)) != 0; //check if we have the feature and return the result.
        } catch (Exception e) {
            return false;//in case invocation fails with any reason
        }
    }
}

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