App Inventor Extensions

Audio Capture Extension

See the App Inventor Extensions document about how to use an App Inventor Extension.

For questions about this extension or bug reports please start a new thread in the App Inventor community. Thank you.

For feature requests please contact me by email. To be a sponsor of a new method already is possible starting from only 10 USD! With your contribution you will help the complete App Inventor community. Thank you.

Nov 26th, 2020: Version 1: initial version for App Inventor.

Jan 2nd, 2021: Version 2: The complete functionality (Start Recording, Stop Recording, Shutdown Service) can now be triggered from the notification. Also the notification is fully customizable (small Icon, notification title, notification text and the three 3 button texts for Record, Stop and Shutdown)

Description

Audio Capture Extension to capture the audio of other applications (usage type MEDIA, GAME and UNKNOWN) using the new Audio Playback Capture API in Android 10, see also this Google blog.
Minimum API level is 29 (Android 10).
Required permissions: android.permission.RECORD_AUDIO, android.permission.FOREGROUND_SERVICE

Starting with Kodular Fenix 1.5.3 this extension now also should work in Kodular..

Note: This extension currently does not work on Android 13 devices. I'm investigating the issue..

What is possible and what not?

It is possible to capture for example the audio of a Youtube video, a Whatsapp audio message, some music played by VLC Player, etc., it is not possible to capture the audio of a phone call.

What does the user see?

Note: Do not use the close application block together with this extension. The code behind the close application block terminates the app in an ungraceful way and unfortunately also kills the running audio capture process. Please use the MoveTaskToBack method instead .

How does it work?

1. Start your Audio Capturing app, agree to the "ugly" dialog message, start the service and move the Audio Capturing app to the back.
2. Now start the app you like to capture the audio.
3. From the Audio Capture notification start the recording and later stop the recording or shutdown the service.
4. The captured audo file will be stored in the ASD (Application Specific Directory) in wav format.

Properties

Return Filename for recording.

Set Filename for recording (wav format). The file will be stored in the ASD - Application Specfic Directory, which is /storage/emulated/0/Android/data/<packageName>/files. Default filename is TaifunAudioCapture.wav.

Return Sound (true or false).

Whether Sound should be on (true) or off (false). Default value is true. If set to true, a short beep sound will be played before and after recording.

Return SmallIcon.

Set SmallIcon for notification. Recommended size is 96x96.

Return Title.

Set Title to be displayed in the notification. Default value is "Audio Capture".

Return Text.

Set Text to be displayed in the notification. Default value is "Audio Capture Service is running...".

Return Record Button text.

Set Text to be displayed in the record button of the notifier. Default value is 'Record'.

Return Stop Button text.

Text to be displayed in the stop button of the notifier. Default value is 'Stop'.

Return Shutdown Button text.

Text to be displayed in the shutdown button of the notifier. Default value is 'Shutdown'.

Methods

Start Service
Note: You will have to build the app to be able to test.

Stop Recording
Note: You will have to build the app to be able to test.

Shutdown Service
Note: You will have to build the app to be able to test.

Move task (i.e. the app) to the background.

Get complete path to the last recorded audio in the ASD - Application Specfic Directory.

Events

Event indicating if media projection permission has been obtained or not.

Example App Audio Capture Test

Screenshots

Test

Tested successfully on Samsung Galaxy A51 running Android 10.

Questions and Answers

currently none

Test the functionality of the Audio Capture extension

1. Follow the opt-in URL for the audio capture example app to get access to the app and to be able to download it to your device.
2. Start testing.

Buy the Audio Capture extension for App Inventor

You can buy this extension (aix file).
With your payment you accept the terms and conditions below.

Payment options

After having received your payment I will be happy to send the download link to you. Please let me know your Google account! I usually will send the download link not later than 24 hours after having received your payment.
Thank you! Taifun

Terms and Conditions

• You are buying a digital product and agree to the No Return, No Refund Policy.
• You have tested the example app successfully on your device before buying the extension.
• You can use the extension in as many projects as you like and pass the generated apk files to as much end users as you like, also of course you can publish your apk files to Google Play and other services
• This is a single user license for you as App Inventor developer, which means, the extension (aix file) is only for you to use. You are not allowed to pass a paid extension (aix file) or a project (aia file) which contains a paid extension to someone else, to post it in one of the communities or to distribute it to others. In case you are interested in a multiple user license, please contact me by email.
• There are a lot of different Android devices available in the market. I'm not able to test the example on all these devices and therefore also can not guarantee, that the example is running on your device.
• THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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