Appy Builder: Using the BatteryStatus component #AppInventor #AppyBuilder #STEM #Programming

A reader asked if there is a way to determine the status of the Android device battery in MIT App Inventor. Unfortunately, App Inventor does not provide a way to check the battery status … but Appy Builder does!

To answer that question, our first Appy Builder app is a simple tutorial showing how to use the BatteryStatus component in Appy Builder.

User Interface

The output is displayed after pressing the Start button and shows that my phone’s battery is at 99% and was plugged in to the AC power charger.

In this screen shot, the phone was unplugged from the battery charger and the “plugged in” status has changed to UNKNOWN.

Designer View

I created this screen by adding a Button control, and then adding six HorizontalLayouts. Inside each layout, I dragged two Label controls, setting one to the descriptive text (such as “Battery level:” and the second to be used to display the status for that property).

Blocks View

The BatteryManager has several properties that describe aspects of the battery.

Before the properties may be used you must activate the BatteryManager by setting the .StartMonitoring property to true; this must be done separately as shown below. Errors occurred when I put that code inside the button’s .Click handler. Instead, I moved the StartMonitoring assignment to the Screen1.Initialize event handler and everything worked fine.

  • BatteryLevel – the battery’s current level in percent
  • BatteryTemperature – the temperature of the battery in degrees Celsius
  • BatteryPresent – true (my phone does not permit me to remove the battery)
  • BatteryPlugged – returns “AC” if the device is connected to a charger, or UNKNOWN if the device is not plugged in. This might also return “WIRELESS” if the device is currently using a wireless charger (based on Android BatteryManager API).
  • BatteryVoltage – battery voltage. A typically value will be near 4 volts plus or minus for most phones.
  • BatteryHealth – GOOD. I presume this returns a value corresponding to the Android BatteryManager API, which includes COLD, DEAD, GOOD, OVERHEAT, OVER_VOLTAGE, UNKNOWN and UNSPECIFIED_FAILURE.

Download Source

Right-click (or Ctrl-click on Mac OS X) and use your browser’s feature to save this file to your computer: BatteryStatus.aia

Then, use Projects | Import selected project (.aia) from my computer … to load the file into Appy Builder

Appy Builder – an alternative to MIT App Inventor, with more features

AppyBuilder is a commercial version of MIT App Inventor that, for a monthly subscription fee, provides access to many additional components and features. Some of these features include monetization services that work with advertising networks to display ads with your apps, plus unique features like SQL Lite and the Android Material Design user interface.  You can also add in-app purchases.

There is also a free version that operates similar to MIT App Inventor. You can set up your free account at the Appy Builder web site or sign up for a subscription account with added features.

AppyBuilder is based on MIT App Inventor – if you know how to use App Inventor, you’ll find AppyBuilder very easy to use. The company behind AppBuilder also does custom app development and mobile web site development.

Click on their “Tell me more” button, and then page down to see the description of features and services, and subscription options.

I’ve played a bit with the “free” version but I could see buying a monthly subscription to access several of their enhanced features. Their lead architect also has a blog including this tutorial on how to use their components to access the web, camera and upload photos to a server using App Builder.

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Since I moved the web site from my own server over to the WordPress platform, you will often see posts authored by “Coldstreams”, or sometimes “AppinventorPlus”, rather than my name, EdwardM, that appeared on the old web site. I have 4 separate accounts on WordPress and set them up so that my Coldstreams account can update any of the blogs, including this one. Most of my posts will likely appear with the “Coldstreams” name, but it is still just me 🙂 … EdwardM