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This article details how to create a timer in Google’s App Inventor that sends a text message to a recipient on a daily basis at a predetermined time.
First, let me say that although this app is functional, App Inventor won’t let you package the application into a distributable APK file, or provide it as a download through the Android Market. Find the Clock component on the left hand side of the screen, in the Basic category of the Pallette. After renaming the Clock1 component, look at the Properties box on the right hand side of the screen, and change the Interval to 60000.
Next, click the Social category in the Pallette section, and drag the Texting component to the screen area.
At this point, your app should appear something like this, not much to look at other than 2 hidden components. Create EventHour and EventMinute variables to store the time we want the text message sent.
Create SMSNumber and SMSMessage variables to store the phone number to receive the SMS message, and the message to send. Add a Clock.Timer block that tells the phone to utilize the Texting component to send a text message to the SMSNumber when the Clock matches the EventHour and EventMinute.
To create the variables we need, click the BuiltIn button at the top of the page so that we can use blocks to define variables. Once those def variable blocks are on the page, click on the text that says variable, and change the names of each of the 4 blocks to EventHour, EventMinute, SMSNumber, and SMSMessage. At this point, we’ve defined the variables, now we need to assign them initial values. Click on the BuiltIn button again if it isn’t selected, and click the Math button to bring up the list of math related blocks. For the EventHour block, snap a number 123 block to the right of it like a puzzle piece, and then click the 123 literal of the number 123 block and specify a reason value to represent the hour that your message should be sent, such as 11.
Do the same thing for the EventMinute block by dragging a number 123 block to the right of it, snap it into place, and change the 123 literal to the minute that you want the text message sent, such as 27.
Click on the BuiltIn button again if it isn’t selected, and click the Text button to bring up the list of text blocks. For the SMSNumber block, snap a text text block to the right of it like a puzzle piece, and then click the text literal of the text text block and specify a reasonable value to represent the phone number to send a text message to, such as 4035323108.


Snap the other text text block to the right of the SMSMessage variable definition block, and give it a reasonable value by clicking on the text literal, such as This is the special message at the special time!. At this point, you’ve defined 4 variables, given 2 of them integer values (via the number 123 block) and 2 of them string values (via the text text block). At this point, we need to create a Timer block to send the text message at the correct time.
Click on My Blocks at the top of the screen, to see all the components we created earlier, such as Clock and Texting.
Click on the Built In button at the top again, and click the Control button, then drag 2 if  test  then-do blocks to the block building area. Now, the first conditional is going to check the EventMinute, and we’re going to do that by using some built in functions for the Clock component. This conditional statement says to execute the code within this block when the Clock’s timer minute is equal to the value of EventMinute. The final steps involve using the Texting component to send the message when the current hour matches the hour we want and the current minute matches the minute we want. Click on the My Blocks button at the top if it isn’t already selected, and click on the Texting component. From the My Blocks button, and My Definitions button, drag the global SMSMessage (not set global SMSMessage) block into the editor and snap it to set Texting.Message. There are probably better ways to create this application, particularly checking the time.  This is just what I came up with playing around for a few hours. For more information, check out App Inventor’s Google Groups page, as well as the Reference Documentation.
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This article assumes you’ve got App Inventor installed, and have set up your computer and Android phone. We don’t need a lot of components or controls on the screen, but we do need to add a Texting and Clock component.
Click the Open Blocks Editor button toward the top-right of the screen, and a Java window will open up, and probably take a little time to initialize. We want to define some variables and assign them values, so drag the block that says def variable in it to the empty page.


Click on the Clock component, and drag a when Clock.Timer do to the blocks area of the screen. Snap one of these if  test then-do blocks inside the other one to make this a nested if condition.
Do the same thing with the global SMSPhoneNumber variable, snapping it to the set Texting.PhoneNumber block. Once that process is complete, you can disconnect your phone, find the DailyMessage app in your phone’s list of apps, and launch it.
If you have a task killer installed on your phone, and you want to use this app religiously, you’ll want to have your task killer set to ignore this app, as it must be running to check the time to send the text message. Also, I use Google Voice for most of my text messaging, but this app will use the native texting app for your phone, not Google Voice.
This app needs to run continuously to check the clock, so make sure to set your phone’s task killer to ignore this app if you want to use it religiously.
We’re going to add 2 conditions in this block (one of the EventHour, one for the EventMinute) to indicate when the SMSMessage should be sent to the SMSNumber. Then click on My Definitions, and choose global EventMinute, and drag it into the editor window. This will tell the timer to execute the containing code every time the timer fires, which we set to 1 minute (60000 milliseconds) in App Inventor. Of course, nothing will really happen except to display a blank screen because there are no controls to be shown. Is it possible to test the application by opening some more emulators and initializing the numbers of Emulator ? Or you can cut to the chase and block all text messages sent from the web or block all text messages sent from email. This is really kind of a PITA to remember all the time, but this article is just to demonstrate what App Inventor is capable of. We’ll also need a logical operator in this equation, so go back to the Built In blocks, click on Logic, and drag an = block to the editor.



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