Mit App Inventor 2 Download On Your#
Mit App Inventor 2 Software At Ai2#
Mit App Inventor 2 Code So That#

Mit App Inventor 2 Download On Your

Open the file.(This post was completely rewritten and updated on October 30, 2015) What is TinyDB?Overview. The location of the download on your computer depends on how your browser is configured. Locate the file MITAppinventorTools2.3.0 (80 MB) in your Downloads file or your Desktop. Follow the instructions at How to Update the App Inventor Setup Software. If you have installed a previous version of the App Inventor 2 setup tools, you will need to uninstall them before installing the latest version.

Mit App Inventor 2 Software At Ai2

Then, from App Inventor's menu (on the App Inventor cloud-based software at ai2. The latest version of MIT App Inventor Tools is 2In respect to this, how do I open MIT App Inventor 2 First, go to App Inventor and open a project (or create a new one - use Project > Start New Project and give your project a name). It was checked for updates 94 times by the users of our client application UpdateStar during the last month.

360 Pages201426.44 MB21,103 Downloads. About Memory on your Phone or TabletOReilly App Inventor 2, Create Your Own Android Apps. Unlike program variables that go away when your app is finished running or your phone is re-set, values stored in TinyDB remain on your phone for use the next time your app is run.

But access to Flash RAM is not as fast as access to conventional RAM memory.Why is it called “Flash”? There was an early version of memory technology where the memory was erased by literally flashing it with ultraviolet light. (In some applications, extra batteries are used to continuously provide power to RAM even when the “normal” power is turned off.)Flash memory retains values when the power is turned off. Once we turn off the power, the values stored in RAM are lost. RAM retains values as long as power is applied to the RAM circuity.

Think of a “tag” as like using your name as your identification to look up your address:TinyDB uses the “tag” (such as Alexa) to quickly locate the corresponding value. TinyDB is based on the concept of a “tag” to identify the stored data, and the data value. Using TinyDBTinyDB provides a simple way to store and retrieve data efficiently and to store the data in long-term storage. TinyDB, on the other hand, stores values in FLASH RAM, where the values remain even when the power is turned off. Modern Flash RAM is read, written and erased electronically.App Inventor variables are stored in RAM memory – and the content of RAM is erased or reset whenever the power is turned off.

The demo app was run in the emulator and screen shots were taken of the emulator as the app was run. As I am used to the name “key”, I tend to use “key” were I should have used “tag” in App Inventor! You will see this is the sample program, below!To learn how to put TinyDB in operation, we construct a very simple app, described below.We first look at how this demo program runs, from the user perspective. App Inventor uses the name “tag” in place of “key”. In most database programs, the “tag” is known as a “key” or “key value”. We do not need to know how TinyDB does its look up so fast – it just does it.

Mit App Inventor 2 Code So That

Note that for convenience, I wrote the code so that tag names are always converted to upper case letters: “task1” becomes “TASK1”. For this demo, I pretended this is a simple “Task list” manager and I eventually entered 3 task items, using the task name (task1, task2, task3) as tag names, and a brief description of each “task” as the data value.After each item is added to TinyDB, a status message is displayed:To demonstrate finding an item in TinyDB, enter a tag value (in this example “task1”) and press the Find Item button:List all Items uses a ListViewer component to display all of the values in TinyDB. Where you see “key” – convert to App Inventor’s “tag” name!)To add an item, enter a “tag” value and then enter a value that corresponds to that tag.

That one block of code is all that is needed to store items into TinyDB. An “invisible” control labeled TinyDB1 appears below your app.The Add button event handler fetches the key value from the text box, converts to upper case, and then uses that as the “tag” for the value to store. Click, drag and drop this control on to your app. Designer ViewThe TinyDB control is in the Palette | Storage area. This demo program does not give a warning before deleting everything – if you wish, add a Notifier dialog to ask the user to confirm the deletion.

We can fetch these values by calling TinyDB1.GetTags, which returns a list containing all of the tags.Our blocks code then scans through the list of tags. This call returns the stored value, or, if not found, it substitutes the text that we provided for valueIfTagNotThere:TinyDB stores a list of all the tags we have used in our TinyDB database. Again, the user entered key (tag) value is used in a call to T inyDB1.GetValue. My bad.Looking up a value is processed by the btnFind Click event handler.

Even though each device has only a single TinyDB database, there are programming tricks we can use to simulate having multiple, separate databases. We can also edit (change) items in the database or delete individual items. Download Source CodeDownload source code: TinyDB_Simple.aia TinyDB, TinyWebDB, Fusion Tables and FilesWe can do a lot more with TinyDB – such as searching the database by the “value” (rather than just using the “tag” to find items). Why do we store these pairs in another list? Because to keep our code simple, we use a ListView to display the results on screen – ListView is built to display the values in a list – so we build a list of key:value pairs!The erase function could not be easier – or more dangerous! One call to TinyDB1.ClearAll does it all!A nice improvement to this code would be to add a dialog box on screen to confirm the deletion. Once we now have both the tag and the value, these are combined into a tag : value pair and stored in another list.

Instead, App Inventor supports a SQL-like database called “Fusion Tables” and they have launched a new feature in “experimental” mode, called Firebase DB.Fusion tables are somewhat complex to set up (you have to login in to a Google developer’s console to create your Fusion table, set up various linkages) and then write special App Inventor code to link to the Fusion table.This is fairly complicated and is why I have not tried to explain it online. App Inventor does not, at this time, support MySQL. We do not need to concern ourselves here with the details of how this works all we need to know is that TinyDB and other data base systems simplify our work by hiding the details of fast searching, storing and retrieving of data.As it sounds like you are familiar with MySQL and have ideas how to set up the MySQL database, I would recommend using Google Fusion tables. This sub field has developed many optimal methods of storing and retrieving data that are vastly faster than the intuitive idea of starting at the beginning of a list and going through each item until the desired item is located.

I have an example using FirebaseDB here – Another way would be to keep the status information in another cloud-based database. FirebaseDB is one way, and perhaps the easiest, although FirebaseDB is still an experimental feature. You can learn more about the e-books on this page:The book also covers the use of text files for writing and reading, plus the use of CSV format files in App Inventor.I hope that is useful to you and your application.If I understand your question, you have an app on one phone, say Phone A, and you would like to transfer some information from the app in Phone A to an app in Phone B? In this case, to change the status of an item (a button) between the two phones.If I understand that is what you want to do, there are 3 ways you might do this, none of them super simple.

Both require some set up to be done in advance, and there is not a short explanation.