Android WiFi Management Sample

朱雀 2022-08-04 12:38 79阅读 0赞

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);
        }
    }

[Full Codes][]

[Full Codes]: http://download.csdn.net/detail/three_man/9052165