The app has become complex enough that it requires a nested ifelse block, as shown in Figure A nested ifelse block is one slotted within the "if" or "else" part of another, outer ifelse. In this case, the outer ifelse branch checks whether the phone number of the received message is already in the list. If it is, the message is relayed to everyone in the list.
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If the number is not in the list, then the nested test is performed: the blocks check if the messageText is equal to "joinFMDT" and branches one of two ways based on the answer. In general, if and ifelse blocks can be nested to arbitrary levels, giving you the power to program increasingly complex behaviors see Chapter 18 for more information on conditional blocks.
The message is broadcast using a foreach within the outer then clause. The foreach loops through and sends the message to each item in the BroadcastList.
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As the foreach repeats, each succeeding phone number from the BroadcastList is stored in var var is a variable placeholder for the current item being processed in the foreach. The blocks within the foreach set Texting. PhoneNumber to the current item var and then send the message. For more information on how foreach works, see Chapter Figure Now we check if the sender is already in the group and broadcast the message if so.
First, have two different phones register by texting "joinFMDT" to the phone running the app.
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Then, text another message from one of the phones. Both phones should receive the text including the one that sent it. The app can now broadcast messages, but the user interface for the app administrator needs some work. First, the list of phone numbers is displayed in an inelegant way.
Specifically, when you place a list variable into a label, it displays the list with spaces between the items, fitting as much as possible on each line. To improve this formatting, create a procedure displayBroadcastList using the blocks listed in Table This procedure displays the list with each phone number on a separate line. Be sure to call the procedure from below the add items to list block so that the updated list is displayed.
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Of course, this displayBroadcastList procedure will not do anything unless you call it. Place a call to it in the Texting1. MessageReceived event handler, right below the call to add item to list. The call should replace the blocks that simply set the BroadcastListLabel. Text to BroadcastList. The call displayBroadcastList block can be found in My Definitions. Figure shows how the relevant blocks within the Texting1. MessageReceived event handler should look.
For more information on using foreach to display a list, see Chapter For more information about creating and calling procedures, see Chapter Restart the app to clear the list and then have at least two different phones register again. Do the phone numbers appear on separate lines?
When a text is received and broadcast to the other phones, the app should log that occurrence so the administrator can monitor the activity. In the Component Designer, you added the label LogLabel to the user interface for this purpose. Now, you'll code some blocks that change LogLabel each time a new text arrives.
So, to build the text, you'll concatenate the first part, "message from", with a value number block and finally with the last part of the message, the text "broadcast. As you've done in previous chapters, use join to concatenate the parts using the blocks listed in Table After broadcasting the received message to all of the numbers in BroadcastList , the app now modifies the LogLabel to add a report of the just-broadcasted text, as shown in Figure Note that now we add the message to the beginning of the list instead of the end, so the more recent message sent to the group shows up at the top.
Each time a text is broadcast, the log entry is prepended to added to the front of the LogLabel. Text so that the most recent entries will appear on top. The way you organize the join block determines the ordering of the entries. In this case, the new message is added with the top three slots of join , and LogLabel. Text —which holds the existing entries-is plugged into the last slot. The app works great so far, but if you've completed some of the earlier tutorials, you've probably guessed that there's a problem: if the administrator closes the app and relaunches it, the broadcast list will be lost and everyone will have to reregister.
To fix this, you'll use the TinyDB component to store and retrieve the BroadcastList to and from a database. You'll use a similar scheme to the one we used in the MakeQuiz app Chapter 10 : Store the list to the database each time a new item is added. When the app launches, load the list from the database into a variable. Start by coding the blocks listed in Table to store the list in the database. With the TinyDB component, a tag is used to identify the data and distinguish it from other data stored in the database. Yes, it IS that simple! I have been using mtt for years and have found it a pivotal tool in creating the life of my dreams.
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Your app appears on the phone step-by-step as you add pieces to it, so you can test your work as you build. When you're done, you can package your app and produce a stand-alone application to install. If you don't have an Android phone, you can build your apps using the Android emulator , software that runs on your computer and behaves just like the phone.