Version 15
InstallationFromAppStore
Returns the package name of the app that has installled your application.
Returns: text
IsInstalledFromPlayStore
Tests if the application is installed from Google Play Store.
Returns: boolean
GetNumberOfCores
Returns the number of processors available to the Java virtual machine.
Returns: number (int)
Thanks to @oseamiya and @HEART12!
Post and website updated, please contact me if you want to add additional blocks to the extension! I will add your name and blocks.
Thank you!
Very good Update!
Sure I will, but later.
@HEART12 just now told me that the code will be published later.
Anyways, here's version 16.
ApplicationLastUpdatedTime
Returns the last updated time from the given package name. The unit is milliseconds after 1970.
Returns: long
Parameters: packageName = text
DeviceId
Returns the device ID.
Returns: text
I will update the website and post later. Thank you!
This is one of the excellent updates for this extension I have eveer seen! 
Website and post now updated with new version of 16, please contact me or reply if there are any errors. Thank you!
sometime we have the hex string like #ffffffff with transparent in format of aarrggbb
is this extension support this?
The extension only supports hex color values.
Version 17!
DisplayScreenTimeout
Returns the screen timeout time of the device.
Returns: number (int)
IsHdrCapable
Returns whether the screen has a high dynamic rate. This only works in versions larger or Android 8.
Returns: boolean
IsScreenRound
Return whether the screen has a round shape. Apps may choose to change styling based on this property, such as the alignment or layout of text or informational icons.
Returns: boolean
LanguageTag
Returns a well-formed IETF BCP 47 language tag representing this locale.
Returns: text
I will update the post and the website later.
Version 18!
Per @Developer's request, I made the following blocks. Thank you Developer!
Events
GotChargingTime
Triggered when finished calculating the remaining charging time. Returns -1 when an error is occured.
Parameters: time = number (long)
This was referenced by @Kumaraswamy and he gave me the permission. Thank you!
Methods
AppPackageName
Returns the package name of the current running application.
Returns: text
ApplicationSpecificDirectory
Returns an absolute path of the application specific directory.
Returns: text
GetBatteryChargingTime
Attempts to calculate the remaining charging time and triggers the GotChargingTime event.
IsEmulator
Checks if the app is operating on an emulator. This does not work on an App Inventor emulator. I used emulator examples in this Stack Overflow answer.
Returns: boolean
IsScreenWideColorGamut
Return whether the screen has a wide color gamut and wide color gamut rendering is supported by this device. When true, it implies the screen is colorspace aware but not necessarily color-managed. The final colors may still be changed by the screen depending on user settings.
Returns: boolean
IsSdCardAvailable
Checks whether the SD card is available.
Returns: boolean
I will update the main post later. Thank you!
Nice update @Gordon_Lu!
@Horizon congratulations on posting the 99th post!
@qwe_rfv congratulations on posting the 100th post!
Off Topic
It depends. What are you using it for? It is 100% free. Are you using it for any competition?
#Off topic
Thank you thank you 
Then what are you using it for? For most extensions (including this one), you:
download it free,
give credit and
add a link to this topic.
Congratulations on your perfect extension but also on the weekly updates 
