Android开发--Wifi的操作

Android应用程序测试Wifi非常简单，只需要调用系统的Wifi服务即可对Wifi进行管理，但是由于模拟器中不能使用Wifi的功能，所以测试的操作需要在手机上运行，下面是实例代码：

public class WifiActivity extends Activity {
	private Button button1;
	private Button button2;
	private Button button3;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_wifi);
		button1=(Button)findViewById(R.id.button1);
		button2=(Button)findViewById(R.id.button2);
		button3=(Button)findViewById(R.id.button3);
		button1.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
//				如果这里直接写this.而不是WifiActivity.this，代表的只是这个内部类的对象，而不是这个Activity的对象
			WifiManager wifiManager=(WifiManager)WifiActivity.this.getSystemService(Service.WIFI_SERVICE);
			wifiManager.setWifiEnabled(true);
			Toast.makeText(WifiActivity.this, "当前Wifi的状态-->"+wifiManager.getWifiState(), Toast.LENGTH_LONG).show();
			}
		});
       button2.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
			WifiManager wifiManager=(WifiManager)WifiActivity.this.getSystemService(Service.WIFI_SERVICE);
			wifiManager.setWifiEnabled(false);
			Toast.makeText(WifiActivity.this, "当前Wifi的状态-->"+wifiManager.getWifiState(), Toast.LENGTH_LONG).show();
			}
		});
       button3.setOnClickListener(new OnClickListener() {
	
	        @Override
	        public void onClick(View v) {
		// TODO Auto-generated method stub
	        WifiManager wifiManager=(WifiManager)WifiActivity.this.getSystemService(Service.WIFI_SERVICE);
	        Toast.makeText(WifiActivity.this, "当前Wifi的状态-->"+wifiManager.getWifiState(), Toast.LENGTH_LONG).show();
	        }
        });
	  }

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.activity_wifi, menu);
		return true;
	}

}

但同时不要忘记添加一些管理的权限，否则系统会报错：

    <!-- 访问Wifi和网络所需要的一些权限 -->
    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>