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);  
        }