Check RSSI by monitoring of WifiManager.RSSI_CHANGED_ACTION

In last exercise, the app "Monitor Wifi status and information with BroadcastReceiver" by monitoring of ConnectivityManager.CONNECTIVITY_ACTION, it will be broadcasted when change in network connectivity has occurred; connection has either been established or lost. In case of RSSI change will not trigger the event.

In order to monitor RSSI change, we have to monitor WifiManager.RSSI_CHANGED_ACTION. In this exercise, another BroadcastReceiver, myRssiChangeReceiver, will be implemented to monitor the broadcast of WifiManager.RSSI_CHANGED_ACTION, to update RSSI if any change.

Modify AndroidWifiMonitor.java only, the other files are same as last exercise "Monitor Wifi status and information with BroadcastReceiver".

package com.exercise.AndroidWifiMonitor;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.widget.TextView;

public class AndroidWifiMonitor extends Activity {

TextView textConnected, textIp, textSsid, textBssid, textMac, textSpeed, textRssi;

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main);

     textConnected = (TextView)findViewById(R.id.Connected);
     textIp = (TextView)findViewById(R.id.Ip);
  
     textSsid = (TextView)findViewById(R.id.Ssid);
     textBssid = (TextView)findViewById(R.id.Bssid);
     textMac = (TextView)findViewById(R.id.Mac);
     textSpeed = (TextView)findViewById(R.id.Speed);
     textRssi = (TextView)findViewById(R.id.Rssi);
  
     DisplayWifiState();
  
     this.registerReceiver(this.myWifiReceiver,
       new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
  
     this.registerReceiver(this.myRssiChangeReceiver,
       new IntentFilter(WifiManager.RSSI_CHANGED_ACTION));

 }

 private BroadcastReceiver myRssiChangeReceiver
 = new BroadcastReceiver(){

 @Override
 public void onReceive(Context arg0, Intent arg1) {
  // TODO Auto-generated method stub
  int newRssi = arg1.getIntExtra(WifiManager.EXTRA_NEW_RSSI, 0);
  textRssi.setText(String.valueOf(newRssi));
 }};

 private BroadcastReceiver myWifiReceiver
 = new BroadcastReceiver(){

 @Override
 public void onReceive(Context arg0, Intent arg1) {
  // TODO Auto-generated method stub
  NetworkInfo networkInfo = (NetworkInfo) arg1.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
  if(networkInfo.getType() == ConnectivityManager.TYPE_WIFI){
   DisplayWifiState();
  }
 }};

 private void DisplayWifiState(){
 
  ConnectivityManager myConnManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
  NetworkInfo myNetworkInfo = myConnManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
  WifiManager myWifiManager = (WifiManager)getSystemService(Context.WIFI_SERVICE);
 WifiInfo myWifiInfo = myWifiManager.getConnectionInfo();

 textMac.setText(myWifiInfo.getMacAddress());

  if (myNetworkInfo.isConnected()){
   int myIp = myWifiInfo.getIpAddress();
  
   textConnected.setText("--- CONNECTED ---");
  
   int intMyIp3 = myIp/0x1000000;
   int intMyIp3mod = myIp%0x1000000;
  
   int intMyIp2 = intMyIp3mod/0x10000;
   int intMyIp2mod = intMyIp3mod%0x10000;
  
   int intMyIp1 = intMyIp2mod/0x100;
   int intMyIp0 = intMyIp2mod%0x100;
  
   textIp.setText(String.valueOf(intMyIp0)
     + "." + String.valueOf(intMyIp1)
     + "." + String.valueOf(intMyIp2)
     + "." + String.valueOf(intMyIp3)
     );
  
   textSsid.setText(myWifiInfo.getSSID());
   textBssid.setText(myWifiInfo.getBSSID());
  
   textSpeed.setText(String.valueOf(myWifiInfo.getLinkSpeed()) + " " + WifiInfo.LINK_SPEED_UNITS);
   textRssi.setText(String.valueOf(myWifiInfo.getRssi()));
  }
  else{
   textConnected.setText("--- DIS-CONNECTED! ---");
   textIp.setText("---");
   textSsid.setText("---");
   textBssid.setText("---");
   textSpeed.setText("---");
   textRssi.setText("---");
  }
 
 }
}

Download the files.

Related Article:
- Detect Wifi ON/OFF state