在 base/services/core/java/com/android/server/power/PowerManagerService.java文件中getScreenOffTimeoutLocked函数中添加如下内容

int nosleep = mScreenOffTimeoutSetting;

        Slog.i(TAG, "nosleep="+nosleep+" MaximumScreenoff="+mMaximumScreenOffTimeoutFromDeviceAdmin);

        if(nosleep  <  70000)  

       {  

        nosleep = mMaximumScreenOffTimeoutFromDeviceAdmin ;

        Slog.i(TAG,"666");

        return Math.max(nosleep, mMaximumScreenOffTimeoutFromDeviceAdmin);  

        }