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();

  }

    

    }

}

 

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