支持WiFi的设备识别WiFi接入点？

Question

支持WiFi的设备如何识别编程语言中的WiFi接入点？

Answer 1

来自：http://www.androidsnippets.com/scan-for-wireless-networks

package com.android.wifitester; 

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) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     mainText = (TextView) findViewById(R.id.mainText); 
     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); 
     } 
    } 
}