android wifi RSSI达到阈值自动断开

设置wifi的RSSI达到阈值之后自动断开。

wifi状态改变，会更新状态栏，在状态栏中更改。

--- a/packages/SystemUI/src/com/android/systemui/statusbar/policy/WifiSignalController.java

+++ b/packages/SystemUI/src/com/android/systemui/statusbar/policy/WifiSignalController.java

@@ -106,6 +106,13 @@ public class WifiSignalController extends

         mCurrentState.ssid = mWifiTracker.ssid;

         mCurrentState.rssi = mWifiTracker.rssi;

         mCurrentState.level = mWifiTracker.level;

+               if (mCurrentState.connected && mCurrentState.rssi < -80)

+                       mWifiManager.disconnect();

         notifyListenersIfNecessary();

     }

2018-6-14