1.WifiManager 打开关闭wifi

--- a/frameworks/base/wifi/java/android/net/wifi/WifiManager.java
+++ b/frameworks/base/wifi/java/android/net/wifi/WifiManager.java
@@ -19,7 +19,7 @@ package android.net.wifi;
 import static android.Manifest.permission.ACCESS_FINE_LOCATION;
 import static android.Manifest.permission.ACCESS_WIFI_STATE;
 import static android.Manifest.permission.READ_WIFI_CREDENTIAL;
-
+import android.os.SystemProperties;
 import android.annotation.CallbackExecutor;
 import android.annotation.I