MainActivity如下:

package cc.ab;import android.os.Bundle;import android.provider.Settings;import android.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: * 1 http://stackoverflow.com/questions/8652031/how-to-modify-wi-fi-sleep-policy-programmatically/8655070#8655070 * 2 http://blog.csdn.net/mrlixirong/article/details/24938637 * Thank you very much * * 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-permission android: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. */public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); setWifiNeverSleep(); } private void setWifiNeverSleep(){ int wifiSleepPolicy=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); } }<RelativeLayout xmlns: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.