设置Android设备WIFI在休眠时永不断开的代码实现

MainActivity如下:

packagecc.ab;

importandroid.os.Bundle;
importandroid.provider.Settings;
importandroid.app.Activity;
/**
*Demo描述:
*设置设备在睡眠期间始终保持WLAN开启.
*
*参考资料:
*1http://stackoverflow.com/questions/8652031/how-to-modify-wi-fi-sleep-policy-programmatically/8655070#8655070
*2http://blog.csdn.net/mrlixirong/article/details/24938637
*Thankyouverymuch
*
*注意事项:
*1这里使用的是android.provider.Settings.System.WIFI_SLEEP_POLICY
*而不是Settings.System.WIFI_SLEEP_POLICY!!!!!!!!!!!!!!!!!!!!!!!
*
*2权限<uses-permissionandroid:name="android.permission.WRITE_SETTINGS"/>
*
*3在实际项目中,这么强制性地设置WIFI在休眠时永不断开有些粗鲁了.
*可以先记录下WIFI原本的策略,待我们的逻辑完成后再还原回去为好.
*/
publicclassMainActivityextendsActivity{

@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setWifiNeverSleep();
}

privatevoidsetWifiNeverSleep(){
intwifiSleepPolicy=0;
wifiSleepPolicy=Settings.System.getInt(getContentResolver(),
android.provider.Settings.System.WIFI_SLEEP_POLICY,
Settings.System.WIFI_SLEEP_POLICY_DEFAULT);
System.out.println("--->修改前的Wifi休眠策略值WIFI_SLEEP_POLICY="+wifiSleepPolicy);


Settings.System.putInt(getContentResolver(),
android.provider.Settings.System.WIFI_SLEEP_POLICY,
Settings.System.WIFI_SLEEP_POLICY_NEVER);


wifiSleepPolicy=Settings.System.getInt(getContentResolver(),
android.provider.Settings.System.WIFI_SLEEP_POLICY,
Settings.System.WIFI_SLEEP_POLICY_DEFAULT);
System.out.println("--->修改后的Wifi休眠策略值WIFI_SLEEP_POLICY="+wifiSleepPolicy);
}

}
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world"/>

</RelativeLayout>

代码如上，不过在实际项目中,这么强制性地设置WIFI在休眠时永不断开有些粗鲁了.
可以先记录下WIFI原本的策略,待我们的逻辑完成后再还原回去为好.