1>获得WifiManager
WifiManager mWiFiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
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2>获得Wifi状态
mWiFiManager.getWifiState()
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WIFI_STATE_ENABLED 已启动
WIFI_STATE_ENABLING 正在启动
WIFI_STATE_DISABLING 正在关闭
WIFI_STATE_DISABLED 已关闭
WIFI_STATE_UNKNOWN 未知
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3>启动Wifi
mWiFiManager.setWifiEnabled(true)
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3>关闭Wifi
mWiFiManager.setWifiEnabled(false)
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