private void detectWifiDebug() {
mSettingsObserver = new ContentObserver(mHandler) {
  @Override
  public void onChange(boolean selfChange, Uri uri) {
    /* do stuff, for some reason when it turns on this is called twice */
  }
};
getContentResolver().registerContentObserver(
    Settings.Global.getUriFor("adb_wifi_enabled"), false,
    mSettingsObserver);
}

我发现这个代码似乎工作。