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 * 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.