禁用三星“自动网络交换机”进行WiFi连接

1 回答

• 21

  编辑：所以，对那些感兴趣的人进一步研究，它似乎是基于4.3的三星Touchwiz版本中添加的功能 . 在内部，该设置名为"wifi_watchdog_connectivity_check" . 我仍然使用下面的代码来查看我是否能够检查设置是否已启用，但否则我将打开'd have to assume it' .

  所以我发现，在您尝试 Build 连接并且操作系统切换远离网络后，Wi-Fi配置处于"disabled"状态 . 因此，在问题发生后，您可以通过检查 WifiManager 中的配置状态来检测它是否已发生 .

  WifiManager m = (WifiManger) getSystemService(Context.WIFI_SERVICE);
  List<WifiConfiguration> networks = m.getConfiguredNetworks();
  String mySsid = "My Network";
  mySsid = "\"" + mySsid + "\"";
  
  boolean isDisabled = false;
  for (WifiConfiguration config : networks) {
      if (mySsid.equals(config.SSID)) {
          if (config.status = WifiConfiguration.Status.DISABLED) {
              isDisabled = true;
              break;
          }
      }
  }
  
  //If isDisabled is true, the network was disabled by the OS
  

  然后，您可以尝试从系统设置应用程序中解析设置的名称：

  /** Gets the resources of another installed application */
  private static Resources getExternalResources(Context ctx, String namespace) {
      PackageManager pm = ctx.getPackageManager();
      try {
          return (pm == null) ? null : pm.getResourcesForApplication(namespace);
      } catch (PackageManager.NameNotFoundException ex) {
          return null;
      }
  }
  
  /** Gets a resource ID from another installed application */
  private static int getExternalIdentifier(Context ctx, String namespace, 
          String key, String type) {
      Resources res = getExternalResources(ctx, namespace);
      return (res == null) ? 0 : res.getIdentifier(key, type, namespace);
  }
  
  /** Gets a String resource from another installed application */
  public static String getExternalString(Context ctx, String namespace, 
          String key, String defVal) {
      int resId = getExternalIdentifier(ctx, namespace, key, "string");
      if (resId != 0) {
          Resources res = getExternalResources(ctx, namespace);
          return res.getString(resId);
      } else {
          return defVal;
      }
  }
  

  然后用它来获取字符串：

  String autoNetworkSwitch = getExternalString(this, "com.android.settings",
          "wifi_watchdog_connectivity_check", "Unknown");
  

  如果字符串存在，这将返回当前用户语言的本地化字符串 .

  ---

  对于任何对此结果感兴趣的人，事实证明这个选项实际上是一个Android设置，但它似乎在这些三星设备上更具侵略性 . 该设置是 android.provider.Settings.java 中的隐藏设置：

  /**
   * Setting to turn off poor network avoidance on Wi-Fi. Feature is enabled by default and
   * the setting needs to be set to 0 to disable it.
   * @hide
   */
  public static final String WIFI_WATCHDOG_POOR_NETWORK_TEST_ENABLED =
         "wifi_watchdog_poor_network_test_enabled";
  

  对于 API == 15 || API == 16 ， Settings$Secure 为 API >= 17 ， Settings$Global 为 API >= 17 . 这不是第三方应用程序可以启用或禁用的设置;但是，可以检测并警告它 . 我的解决方案是：

  import static android.os.Build.VERSION.SDK_INT;
  import static android.os.Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1;
  import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR1;
  
  /**
   * Checks whether the "Avoid poor networks" setting (named "Auto network switch" on 
   * some Samsung devices) is enabled, which can in some instances interfere with Wi-Fi.
   *
   * @return true if the "Avoid poor networks" or "Auto network switch" setting is enabled
   */
  public static boolean isPoorNetworkAvoidanceEnabled (Context ctx) {
      final int SETTING_UNKNOWN = -1;
      final int SETTING_ENABLED = 1;
      final String AVOID_POOR = "wifi_watchdog_poor_network_test_enabled";
      final String WATCHDOG_CLASS = "android.net.wifi.WifiWatchdogStateMachine";
      final String DEFAULT_ENABLED = "DEFAULT_POOR_NETWORK_AVOIDANCE_ENABLED";
      final ContentResolver cr = ctx.getContentResolver();
  
      int result;
  
      if (SDK_INT >= JELLY_BEAN_MR1) {
          //Setting was moved from Secure to Global as of JB MR1
          result = Settings.Global.getInt(cr, AVOID_POOR, SETTING_UNKNOWN);
      } else if (SDK_INT >= ICE_CREAM_SANDWICH_MR1) {
          result = Settings.Secure.getInt(cr, AVOID_POOR, SETTING_UNKNOWN);
      } else {
          //Poor network avoidance not introduced until ICS MR1
          //See android.provider.Settings.java
          return false;
      }
  
      //Exit here if the setting value is known
      if (result != SETTING_UNKNOWN) {
          return (result == SETTING_ENABLED);
      }
  
      //Setting does not exist in database, so it has never been changed.
      //It will be initialized to the default value.
      if (SDK_INT >= JELLY_BEAN_MR1) {
          //As of JB MR1, a constant was added to WifiWatchdogStateMachine to determine 
          //the default behavior of the Avoid Poor Networks setting.
          try {
              //In the case of any failures here, take the safe route and assume the 
              //setting is disabled to avoid disrupting the user with false information
              Class wifiWatchdog = Class.forName(WATCHDOG_CLASS);
              Field defValue = wifiWatchdog.getField(DEFAULT_ENABLED);
              if (!defValue.isAccessible()) defValue.setAccessible(true);
              return defValue.getBoolean(null);
          } catch (IllegalAccessException ex) {
              return false;
          } catch (NoSuchFieldException ex) {
              return false;
          } catch (ClassNotFoundException ex) {
              return false;
          } catch (IllegalArgumentException ex) {
              return false;
          }
      } else {
          //Prior to JB MR1, the default for the Avoid Poor Networks setting was
          //to enable it unless explicitly disabled
          return true;
      }
  }
  

  为了更好地衡量，您可以通过 Intent 将用户定向到高级Wi-Fi设置：

  /**
   *  Ensure that an Activity is available to receive the given Intent
   */
  public static boolean activityExists (Context ctx, Intent intent) {
      final PackageManager mgr = ctx.getPackageManager();
      final ResolveInfo info = mgr.resolveActivity(i, PackageManager.MATCH_DEFAULT_ONLY);
      return (info != null);
  }
  
  public static void showAdvancedWifiIfAvailable (Context ctx) {
      final Intent i = new Intent(Settings.ACTION_WIFI_IP_SETTINGS);
      if (activityExists(ctx, i)) {
          ctx.startActivity(i);
      }
  }
  

  有趣的琐事：这个 Intent 带来与设置> Wi-Fi>高级相同的 Activity ，但会显示不同的 Headers （IP设置，高级Wi-Fi） .

  回复于 2024-05-17T05:34:28+08:00