Android WiFi Management Sample

Method onCreate(Bundle savedInstanceState) is called when the activity(WiFiManageActivity.java) is starting.

These intent broadcasts (WifiManager.SCAN_RESULTS_AVAILABLE_ACTION and WifiManager.RSSI_CHANGED_ACTION) will to be received by BroadcastReceiver (WiFiBroadcastReceiver.java).

Make text about the best signal one connection when received intent action WifiManager.SCAN_RESULTS_AVAILABLE_ACTION.

Make text about all active connections when received intent action WifiManager.RSSI_CHANGED_ACTION.

Activity Class:

package com.paad.wifi;import android.app.Activity;import android.content.Context;import android.content.IntentFilter;import android.net.wifi.WifiManager;import android.os.Bundle;public class WiFiManageActivity extends Activity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);        setWifiEnabled(wifi);        // Register a broadcast receiver that listens for actions.        registerReceiver(new WiFiBroadcastReceiver(this, wifi), new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));        registerReceiver(new WiFiBroadcastReceiver(this, wifi), new IntentFilter(WifiManager.RSSI_CHANGED_ACTION));        wifi.startScan();    }    private void setWifiEnabled(WifiManager wifi) {        if (!wifi.isWifiEnabled() && wifi.getWifiState() != WifiManager.WIFI_STATE_ENABLING) {            wifi.setWifiEnabled(true);        }    }}

BroadcastReceiver Class:

package com.paad.wifi;import java.util.List;import com.paad.util.NetworkUtil;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.net.wifi.ScanResult;import android.net.wifi.WifiInfo;import android.net.wifi.WifiManager;import android.util.Log;import android.widget.Toast;public class WiFiBroadcastReceiver extends BroadcastReceiver {    private Context context = null;    private WifiManager wifi = null;    public WiFiBroadcastReceiver(Context context, WifiManager wifi) {        this.context = context;        this.wifi = wifi;    }    @Override    public void onReceive(Context context, Intent intent) {        if (WifiManager.RSSI_CHANGED_ACTION.equals(intent.getAction())) {            findActiveConnection();        }        if (WifiManager.SCAN_RESULTS_AVAILABLE_ACTION.equals(intent.getAction())) {            findBestSignalConnection();        }    }    private void findBestSignalConnection() {        List<ScanResult> results = wifi.getScanResults();        ScanResult bestSignal = null;        for (ScanResult result : results) {            if (bestSignal == null || WifiManager.compareSignalLevel(bestSignal.level, result.level) < 0)                bestSignal = result;        }        String connSummary = String.format("%s networks found. %s is " + "the strongest.", results.size(), bestSignal.SSID);        Toast.makeText(context, connSummary, Toast.LENGTH_LONG).show();        Log.d(NetworkUtil.TAG, connSummary);    }    private void findActiveConnection() {        WifiInfo info = wifi.getConnectionInfo();        if (info.getBSSID() != null) {            String ssid = info.getSSID();            String units = WifiInfo.LINK_SPEED_UNITS;            int speed = info.getLinkSpeed();            int strength = WifiManager.calculateSignalLevel(info.getRssi(), 5);            String ipAddress = NetworkUtil.intToIp(info.getIpAddress());            String connSummary = String.format("Connected to %s at %s%s. " + "Strength %s/5. " + "IP %s", ssid, speed, units, strength, ipAddress);            Toast.makeText(context, connSummary, Toast.LENGTH_LONG).show();            Log.d(NetworkUtil.TAG, connSummary);        }    }}

Util Class:

package com.paad.util;public class NetworkUtil {    public final static String TAG = "WiFi";    public static String intToIp(int i) {        return (i & 0xFF) + "." + ((i >> 8) & 0xFF) + "." + ((i >> 16) & 0xFF) + "." + ((i >> 24) & 0xFF);    }}

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