安卓7.1/7.0/6.x WiFi和信號圖標出現感嘆號的解決方法

一、簡單的單機機器解決：

adb shell settings delete global captive_portal_server  
adb shell settings put global captive_portal_detection_enabled 0

二、系統源碼着手：

路徑：frameworks/base/packages/SettingsProvider

/res/values/defaults.xml:

<integer name="def_captive_portal_detection_enabled">0</integer>

/src/com/android/providers/settings/DatabaseHelper.java:

@method:private void loadGlobalSettings(SQLiteStatement stmt) {
  loadIntegerSetting(stmt, Global.CAPTIVE_PORTAL_DETECTION_ENABLED,
                    R.integer.def_captive_portal_detection_enabled);