Scan for Wireless Networks

3 votes · 5 comments

Scan for wireless networks in the current area. first posted on anddev by nas061000

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package; import java.util.List; import; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import; import; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.widget.TextView; public class WifiTester extends Activity { TextView mainText; WifiManager mainWifi; WifiReceiver receiverWifi; List<ScanResult> wifiList; StringBuilder sb = new StringBuilder(); public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mainText = (TextView) findViewById(; mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE); receiverWifi = new WifiReceiver(); registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); mainWifi.startScan(); mainText.setText("\\nStarting Scan...\\n"); } public boolean onCreateOptionsMenu(Menu menu) { menu.add(0, 0, 0, "Refresh"); return super.onCreateOptionsMenu(menu); } public boolean onMenuItemSelected(int featureId, MenuItem item) { mainWifi.startScan(); mainText.setText("Starting Scan"); return super.onMenuItemSelected(featureId, item); } protected void onPause() { unregisterReceiver(receiverWifi); super.onPause(); } protected void onResume() { registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); super.onResume(); } class WifiReceiver extends BroadcastReceiver { public void onReceive(Context c, Intent intent) { sb = new StringBuilder(); wifiList = mainWifi.getScanResults(); for(int i = 0; i < wifiList.size(); i++){ sb.append(new Integer(i+1).toString() + "."); sb.append((wifiList.get(i)).toString()); sb.append("\\n"); } mainText.setText(sb); } } }
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Nice post,

um, it worked thanks!

Thanks for writing, most people don't bother.

Reply · Aug. 28, 2009, 9:14 p.m.

Thank you It works just fine. Very Helpful

Reply · April 6, 2012, 11 a.m.

what if i use listview and arrayadapter instead of textview and add different wifi network in list and then clicking at particular item, i can connect to it. is this even possible? if yes can you please explain how to do it?

Reply · Jan. 16, 2014, 2:10 p.m.

Just awesome. That works perfectly fine. All you need to do is add Access_wifi_state and change_wifi_state permissions.

Thank you

Reply · Feb. 11, 2014, 1:04 a.m.

can we send another string when we try to broadcast our wifi state ?

so when we receive it on BroadcastReceiver we could check what message given. Is it possible?

Reply · July 6, 2014, 5:44 a.m.