Launch an application from AppInventor

[Christophe_Armand]

Hello,
I designed an application for my car.
I need to launch the application of the rear camera car when I switch on the rear lights and return to my appinventor application when rear lights are switch off.
I'm searching with notifier but I didn't find how.
Thanks for your help.

[gordonlu310]

From what I understand, you can use this extension here.

App Inventor Extensions: Package Manager | Pura Vida Apps

You will need the package name of the other app.

[SteveJG]

You may be able to use an ActivityStarter,

There is an example of a technique you might be able to use in Using the Activity Starter

[Christophe_Armand]

Thanks Gordon_Lu
The call of rear camera car from my application woks fine when rear lights are switch on.
But my application doesn't display again when rear lights are switch off.
I get data from serial link from Arduino.
How to data when my application is in background ?

[Wes_Savage]

@Christophe_Armand christophe perhaps this link will help: background extension

[gordonlu310]

@Wes_Savage, the link you provided has paid or incompleted extensions. This is a free one.

Background Tasks extension [3.8 A]

An extension to create components, call functions or tasks in the background and when the app is alive with various features! Extension version --> 3.8 A Beta testers and helpers @rizu @themaayur @vknow360 @MohamedTamer @WatermelonIce @Hrichik_Mazumder @newbiedeveloper @Know_About_IT @Pradevel Documentation Here is the documentation of all the available blocks. If you have found a mistake then let me know about it. Creating a component [04.04.2021_11.01.36_REC] Cr…

[Wes_Savage]

@gordonlu310 nice! I dint read deep into it Gordon .. apologies for that. I just figured it was a good place to start. Thank you much for this lead / extension

[Christophe_Armand]

@gordonlu310 the extension seems very cool but I don't understand how to use it for my project.
Which block using to activate the application when rear lights are switching off ?
The signal is recovered with a serial link.
Thanks for your help

[gordonlu310]

I found a similar example for the paid version of a similar extension. Maybe you can take a look at it.

Does anyone have a working example of the BackgroundTasks Extension

Thanks all for the help. The Background Extension is all working now. It does work in AI2, just not work in the Companion as stated above. When compiled this example is working the way it should with the screen off. I contacted [Atom_Developer] who easily pointed me in the right direction. Here is my example for anyone else who purchase the ext. [Background example]

[nishyanthkumar]

The extension you've been pointed to should be used to run tasks in the background. You'll have to use Arduino (a camera/LDR, I suppose) in conjunction with App Inventor to watch over the car lights.

[Christophe_Armand]

I use Arduino to get the signal of rear lights and I use a wifi camera. I develop my own AppInventor application for a lot of features.
When the signal is switching ON I want to display the camera application at the top.
When the signal is switching OFF I want to display my application at the top.

[nishyanthkumar]

I think you'll have to use a Bluetooth module (such as HC-05). Juan Antonio has a very good tutorial on integrating HC-05 with your app:

Bluetooth HC-06. Arduino. Send. Receive. Send text file. Multitouch. Image

1.- App sends simple char. Arduino on-off LED12 and LED13. p9A0i_bluetooth_caracter.aia (2.4 KB) [bt_4] [bt_3] // Juan A. Villalpando // http://kio4.com/appinventor/9A0_Resumen_Bluetooth.htm #define Pin12 12 #define Pin13 13 char caracter; void setup() { Serial.begin(9600); pinMode(Pin12, OUTPUT); pinMode(Pin13, OUTPUT); } void loop() { if(Serial.available()) { caracter = Serial.read(); if(caracter == 'a'){ digitalWrite(Pin12, HIGH);} if(caracter == 'b'){ digi…

[Christophe_Armand]

I choose to connect with serial and not BT because I use BT for media.

[Christophe_Armand]

Can you help me please to set up the task ?
I get the signal of rear light from serial connection and with a clock.

If the value equals 1 (switch on lights) I launch the application for camera com.zeng.wifiavhd else I want to put my application at the top on the page "consos".
Thanks for your help.