How to Use GetTickCount in Delphi XE5 for Android Development
GetTickCount is a Windows API function that returns the number of milliseconds that have elapsed since the system was started. It is often used to measure the execution time of a code segment or to implement a simple timer. However, GetTickCount is not available on other platforms, such as Android, which poses a challenge for cross-platform development using Delphi XE5.
In this article, we will explore some alternatives to GetTickCount that can be used in Delphi XE5 for Android development. We will also show how to read the serial number of an Android device using Delphi XE5.
One possible alternative to GetTickCount is to use the TThread.GetTickCount method, which is cross-platform and returns the number of milliseconds that have elapsed since an arbitrary point in time. For example, we can use it to measure the execution time of a code segment as follows:
However, this method has some drawbacks. First, it returns a 32-bit unsigned integer, which means that it will overflow every 49.7 days and produce incorrect results. Second, it has a low resolution of 1 millisecond, which may not be accurate enough for some applications. Third, it may drift due to system clock adjustments or hardware limitations.
A better alternative to GetTickCount is to use the TStopWatch class from the System.Diagnostics unit, which provides high-resolution and high-accuracy timing functions. For example, we can use it to measure the execution time of a code segment as follows:
This method has several advantages over TThread.GetTickCount. First, it returns a 64-bit signed integer, which means that it will not overflow for a very long time. Second, it has a high resolution of nanoseconds, which means that it can measure very short intervals with precision. Third, it uses a monotonic clock source, which means that it is not affected by system clock adjustments or hardware limitations.
How to Read Serial Number of Android Device
Another common task for Android development is to read the serial number of an Android device, which can be used for identification or authentication purposes. However, this task is not trivial in Delphi XE5, as there is no built-in function or property that can access this information.
One possible solution is to use the Java bridge feature of Delphi XE5, which allows us to call Java methods from Delphi code. For example, we can use the following code to read the serial number of an Android device:
function GetSerialNumber: string;
BuildClass := TJBuild.JavaClass;
Result := JStringToString(BuildClass.SERIAL);
This code uses the JBuild class from the Android API, which provides information about the device's hardware and software configuration. The SERIAL field of this class returns the serial number of the device as a Java string, which we then convert to a Delphi string using the JStringToString function.
However, this solution may not work on all devices or Android versions, as some manufacturers may not implement this field or may return a different value than expected. Therefore, it is advisable to check the availability and validity of this field before using it.