讲解Context的一篇不错的文章http://www.cppblog.com/life02/archive/2012/03/19/168328.aspx
调用service时需要一个Context实例!
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| public void startWifi(Context context) { WifiManager wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE); wifiManager.setWifiEnabled(true); }
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如果方法所在的类继承Activity,则上面代码可换为
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| public void startWifi(Context context) { WifiManager wifiManager = (WifiManager)WifiActivity.this.getSystemService(Context.WIFI_SERVICE); wifiManager.setWifiEnabled(true); }
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