編輯:那麼,對於那些有興趣進一步研究,這似乎是在三星的Touchwiz版本中添加基於4.3的特性。在內部,該設置被命名爲「wifi_watchdog_connectivity_check」。我仍然使用下面的代碼來查看我是否能夠檢查確定該設置是否啓用,否則我將不得不假定它已啓用。
所以我發現,在您嘗試建立連接並且操作系統切換離開網絡後,Wi-Fi配置處於「禁用」狀態。因此,在發生問題後,您可以通過檢查WifiManager
中的配置狀態來確認它是否已發生。
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
然後,您可以嘗試解決從系統設置程序設置的名稱:
/** 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;
}
}
然後用它來獲取字符串:
String autoNetworkSwitch = getExternalString(this, "com.android.settings",
"wifi_watchdog_connectivity_check", "Unknown");
這將返回如果字符串存在,則爲當前用戶的語言使用本地化的字符串。
對於任何有志於這個結果,事實證明,這個選擇其實是一個普通的Android設置,但它似乎對這些三星手機更有侵略性。該設置是在android.provider.Settings.java
發現了一個隱藏設置:
/**
* 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";
這是Settings$Secure
爲API == 15 || API == 16
,或Settings$Global
爲API >= 17
。這不是可以由第三方應用程序啓用或禁用的設置;然而,它可以被檢測到並警告。我的解決辦法是這樣的:
/**
* 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);
}
}
有趣的花絮:這Intent
帶來了同樣的
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;
}
}
良好的措施,然後你可以通過Intent
手段引導用戶到高級Wi-Fi設置Activity
作爲進入設置>的Wi-Fi>高級,但會用不同的標題(IP設置,VS高級Wi-Fi)表現出來。
你可能有三星自家的論壇更好的運氣,如果你還沒有嘗試過它們已經:http://developer.samsung.com/forum/en – CommonsWare
會做,感謝您的鏈接。 :) – kcoppock