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