desc:监听wifi开关及信号强度变化

app/src/main/AndroidManifest.xml

@@ -8,6 +8,7 @@
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.CAMERA" />

app/src/main/java/com/yinuo/safetywatcher/watcher/utils/WifiHelper.kt

@@ -14,17 +14,20 @@ object WifiHelper {
 
     private val receiver = object : BroadcastReceiver() {
         override fun onReceive(context: Context?, intent: Intent?) {
-            val wifiState = intent?.getIntExtra(WifiManager.EXTRA_WIFI_STATE, -1)
+            if (intent?.action.equals(WifiManager.WIFI_STATE_CHANGED_ACTION)) {
-            val rssi = intent?.getIntExtra(WifiManager.EXTRA_NEW_RSSI, -1)
+                val wifiState = intent?.getIntExtra(WifiManager.EXTRA_WIFI_STATE, -1)
-            mWifiState = wifiState!!
+                mWifiState = wifiState!!
-            mRssi = WifiManager.calculateSignalLevel(rssi!!, 5)
+            } else if (intent?.action.equals(WifiManager.RSSI_CHANGED_ACTION)) {
+                val rssi = intent?.getIntExtra(WifiManager.EXTRA_NEW_RSSI, -1)
+                mRssi = WifiManager.calculateSignalLevel(rssi!!, 5)
+            }
             Log.i(
                 this@WifiHelper.javaClass.name,
-                "onReceive wifiState = $wifiState, mRssi = $mRssi"
+                "onReceive action = ${intent?.action}, wifiState = $mWifiState, mRssi = $mRssi"
             )
             callbacks.forEach {
                 it.onLevel(
-                    wifiState == WifiManager.WIFI_STATE_ENABLED, mRssi
+                    mWifiState == WifiManager.WIFI_STATE_ENABLED, mRssi
                 )
             }
         }