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    Scan or read for wireless networks in Android WiFi

    This class provides the primary API for managing all aspects of Wi-Fi connectivity. Get an instance of this class by calling Context.getSystemService(Context.WIFI_SERVICE). It deals with several categories of items:

    • The list of configured networks. The list can be viewed and updated, and attributes of individual entries can be modified.
    • The currently active Wi-Fi network, if any. Connectivity can be established or torn down, and dynamic information about the state of the network can be queried.
    • Results of access point scans, containing enough information to make decisions about what access point to connect to.
    • It defines the names of various Intent actions that are broadcast upon any sort of change in Wi-Fi state.
    This is the API to use when performing Wi-Fi specific operations. To perform operations that pertain to network connectivity at an abstract level, use ConnectivityManager. Scan for wireless networks in the current area:

    import java.util.List;
    import android.app.Activity;
    import android.content.BroadcastReceiver;
    import android.content.Context;
    import android.content.Intent;
    import android.content.IntentFilter;
    import android.net.wifi.ScanResult;
    import android.net.wifi.WifiManager;
    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) {
       mainText = (TextView) findViewById(R.id.mainText);
       mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
       receiverWifi = new WifiReceiver();
       registerReceiver(receiverWifi, new IntentFilter(
       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) {
        mainText.setText("Starting Scan");
        return super.onMenuItemSelected(featureId, item);
      protected void onPause() {
      protected void onResume() {
        registerReceiver(receiverWifi, new IntentFilter(
      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() + ".");

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