0123WIFI网络操作（一）
1 package mars.wifi;2
3 import android.app.Activity;
4 import android.content.Context;
5 import android.net.wifi.WifiManager;
6 import android.os.Bundle;
7 import android.view.View;
8 import android.view.View.OnClickListener;
9 import android.widget.Button;
10 import android.widget.Toast;
11
12 public class WifiActivity extends Activity {
13 /** Called when the activity is first created. */
14 private Button startButton = null;
15 private Button stopButton = null;
16 private Button checkButton = null;
17 private WifiManager wifiManager = null;
18 @Override
19 public void onCreate(Bundle savedInstanceState) {
20 super.onCreate(savedInstanceState);
21 setContentView(R.layout.main);
22 startButton = (Button)findViewById(R.id.startWifi);
23 stopButton = (Button)findViewById(R.id.stopWifi);
24 checkButton = (Button)findViewById(R.id.checkWifi);
25 startButton.setOnClickListener(new StartWifiListener());
26 stopButton.setOnClickListener(new StopWifiListener());
27 checkButton.setOnClickListener(new CheckWifiListener());
28 }
29 class StartWifiListener implements OnClickListener{
30
31 @Override
32 public void onClick(View v) {
33 wifiManager = (WifiManager)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
34 wifiManager.setWifiEnabled(true);
35 System.out.println("wifi state --->" + wifiManager.getWifiState());
36 Toast.makeText(WifiActivity.this, "当前Wifi网卡状态为" + wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
37 }
38 }
39 class StopWifiListener implements OnClickListener{
40
41 @Override
42 public void onClick(View arg0) {
43 // TODO Auto-generated method stub
44 wifiManager = (WifiManager)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
45 wifiManager.setWifiEnabled(false);
46 System.out.println("wifi state --->" + wifiManager.getWifiState());
47 Toast.makeText(WifiActivity.this, "当前Wifi网卡状态为" + wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
48 }
49
50 }
51
52 class CheckWifiListener implements OnClickListener{
53
54 @Override
55 public void onClick(View v) {
56 wifiManager = (WifiManager)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
57 System.out.println("wifi state --->" + wifiManager.getWifiState());
58 Toast.makeText(WifiActivity.this, "当前Wifi网卡状态为" + wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
59 }
60
61 }
62 }
为什么是WifiActivity.this.getSystemService(Context.WIFI_SERVICE);？因为监听器是一个内部类，而现在要操作WifiActivity这个外部的类，所以必须要有this指明
Activity ,Serivce都是 Context的一个子类，拥有父类所有的属性
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