获取Android WiFi"net.hostname"从代码 [英] Get Android WiFi "net.hostname" from code

问题描述

当Android设备连接到wifi AP时，它会使用以下名称标识自己:

When an Android device connects to a wifi AP, it identifies itself with a name like:

android_cc1dec12345e6054

android_cc1dec12345e6054

如何从Android应用程序中获取该字符串?并非出于更改目的，而只是出于读出目的.

How can that string be obtained from within an Android app? Not for the purpose of changing it, just for readout.

这是路由器的Web界面的屏幕截图，显示了所有已连接设备的列表.请注意列表中的两个Android设备-如何从设备上运行的Java代码读取该字符串?

This is a screenshot of my router's web interface, showing a list of all connected devices. Note the two Android devices on the list -- How can that string be read from Java code running on the device?

推荐答案

以@Merlevede的答案为基础，这是一种获取属性的快捷方法.这是一个私有API，因此可能会发生变化，但是至少从Android 1.5开始，此代码就没有进行过修改，因此使用起来可能很安全.

Building off of @Merlevede's answer, here's a quick and dirty way to get the property. It's a private API, so it's subject to change, but this code hasn't been modified since at least Android 1.5 so it's probably safe to use.

import android.os.Build;
import java.lang.reflect.Method;

/**
 * Retrieves the net.hostname system property
 * @param defValue the value to be returned if the hostname could
 * not be resolved
 */
public static String getHostName(String defValue) {
    try {
        Method getString = Build.class.getDeclaredMethod("getString", String.class);
        getString.setAccessible(true);
        return getString.invoke(null, "net.hostname").toString();
    } catch (Exception ex) {
        return defValue;
    }
}

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