Android to get the current connected WiFi signal strength method _android

This article illustrates how Android gets the strength of the currently connected WiFi signal, and is a very common and important skill in Android development. Share for everyone to use for reference. The specific methods are as follows:

1. Get WiFi information that is currently connected

Wifimanager Wifi_service = (wifimanager) getsystemservice (wifi_service); 
Wifiinfo wifiinfo = Wifi_service.getconnectioninfo ();

The Wifiinfo has the following methods:

Wifiinfo.getbssid ();
Wifiinfo.getssid ();
Wifiinfo.getipaddress (); Gets the IP address.
Wifiinfo.getmacaddress (); Get MAC address.
Wifiinfo.getnetworkid (); Get the network ID.
Wifiinfo.getlinkspeed (); Gets the connection speed that allows the user to learn about this information.

Wifiinfo.getrssi (); Get Rssi,rssi is to accept signal strength indication. this can be directly compared to Huawei's Wi-Fi signal thresholds to provide users with a network or geographic adjustment to achieve the best connection effect.
here the signal strength is obtained by Wifiinfo.getrssi ();

2. The resulting value is an interval value of 0 to 100, which is an int, where 0 to 50 indicates the best signal, and-50 to 70 indicates a signal deviation, less than-70 indicates the worst, and may not connect or fall off the line.
What I do here is to change the picture based on the signal strength. The settings configuration file Wifi_sel.xml as follows:

<level-list xmlns:android= "Http://schemas.android.com/apk/res/android" >  
  <item android:maxlevel= "50" android:drawable= "@drawable/library_template_05"/>  
  <item android:maxlevel= "android:drawable=" @ Drawable/library_template_05_2 "/>  
  <item android:maxlevel=" android:drawable= "@drawable/library_ Template_05_3 "/>  
</level-list> 

Note that this is all absolute, because at imageview.setimagelevel level, the level must be absolute, otherwise the program will report a null pointer.

3. Registering for listening, and Android battery listening display similar

WiFi-related  
intentfilter wifiintentfilter;  WiFi Listener 

In the OnCreate method, add:

WiFi  
wifiintentfilter = new Intentfilter ();  
Wifiintentfilter.addaction (wifimanager.wifi_state_changed_action); 

4. Then again:

Declare wifi message processing private broadcastreceiver Wifiintentreceiver = new Broadcastreceiver () {@Override public void onre  
    Ceive (context context, Intent Intent) {int wifi_state = Intent.getintextra ("Wifi_state", 0); 
    int level = Math.Abs ((wifimanager) Getsystemservice (Wifi_service)). Getconnectioninfo (). Getrssi ());  
    LOG.I (Global.tag, "1111:" + level); Switch (wifi_state) {case wifimanager.wifi_state_disabling:log.i (Global.tag, "1111:" + wifimanager.wifi_st  
      ate_disabling);  
      Wifi_image.setimageresource (R.drawable.wifi_sel);  
      Wifi_image.setimagelevel (level);  
    Break  
      Case WIFIMANAGER.WIFI_STATE_DISABLED:LOG.I (Global.tag, "2222:" + wifimanager.wifi_state_disabled);  
      Wifi_image.setimageresource (R.drawable.wifi_sel);  
      Wifi_image.setimagelevel (level);  
    Break  
      Case WifiManager.WIFI_STATE_ENABLING:wifi_image.setImageResource (R.drawable.wifi_sel);  
 Wifi_image.setimagelevel (level);     LOG.I (Global.tag, "33333:" + wifimanager.wifi_state_enabling);  
    Break  
      Case WIFIMANAGER.WIFI_STATE_ENABLED:LOG.I (Global.tag, "4444:" + wifimanager.wifi_state_enabled);  
      Wifi_image.setimageresource (R.drawable.wifi_sel);  
      Wifi_image.setimagelevel (level);  
    Break  
      Case WIFIMANAGER.WIFI_STATE_UNKNOWN:LOG.I (Global.tag, "5555:" + wifimanager.wifi_state_unknown);  
      Wifi_image.setimageresource (R.drawable.wifi_sel);  
      Wifi_image.setimagelevel (level);  
    Break 

 }  
  }  
};

5. Registered in the Onresume method, destroyed in the OnPause method :

@Override  
protected void Onresume () {  
  super.onresume ();
  Register WiFi Message Processor  
  registerreceiver (Wifiintentreceiver, wifiintentfilter); 
@Override  
protected void OnPause () {  
  super.onpause ();  
  Unregisterreceiver (Wifiintentreceiver);  
} 

6. Finally add permission:

<uses-permission android:name= "Android.permission.ACCESS_WIFI_STATE" ></uses-permission>

It is believed that this article has certain reference value to everyone's Android program design.