android 中wifi的应用

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加入权限

<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"></uses-permission>
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>

主要代码

//打开状态
   wifiManager=(WifiManager)ActivityMain.this.getSystemService(Context.WIFI_SERVICE);
   wifiManager.setWifiEnabled(true);
   System.out.println("wifi state-->"+wifiManager.getWifiState());
   Toast.makeText(ActivityMain.this, "当前wifi网卡状态为"+wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
}

    }
//关闭状态
   wifiManager=(WifiManager)ActivityMain.this.getSystemService(Context.WIFI_SERVICE);
   wifiManager.setWifiEnabled(false);
   System.out.println("wifi state-->"+wifiManager.getWifiState());
   Toast.makeText(ActivityMain.this, "当前wifi网卡状态为"+wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
}
     //检查状态
     wifiManager=(WifiManager)ActivityMain.this.getSystemService(Context.WIFI_SERVICE);
   //wifiManager.setWifiEnabled(false);
   System.out.println("wifi state-->"+wifiManager.getWifiState());
   Toast.makeText(ActivityMain.this, "当前wifi网卡状态为"+wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
}

    }
}

相关连接http://lpqsun-126-com.iteye.com/blog/1087847

http://zkl-1987.iteye.com/blog/1054913