Comment effacer des images (How do you delete images?)

[agnes_fazio]

bonjour, dans mon application j'ai un bouton télécharger l'image et un bouton supprimer l'image , mais comment faire avec les blocs pour le bouton supprimer ?

[Taifun]

@agnes_fazio

but how to do it with the blocks to the delete button ?

are you talking about how to set a button to invisible?
just set the visible property of the button to false

http://ai2.appinventor.mit.edu/reference/components/userinterface.html#Button

Visible

Specifies whether the Button should be visible on the screen. Value is true if the Button is showing and false if hidden.

Taifun

[agnes_fazio]

non je ne parle pas du bouton , je parle de l'image

[agnes_fazio]

c'est à dire en cliquant sur le bouton je veux supprimer l'image

[Taifun]

@agnes_fazio

by clicking on the button I want to delete the image

use the file component to delete the image
http://ai2.appinventor.mit.edu/reference/components/storage.html#File

Delete(fileName)

Deletes a file from storage. Prefix the fileName with / to delete a specific file in the SD card (for example, /myFile.txt will delete the file /sdcard/myFile.txt). If the fileName does not begin with a /, then the file located in the program’s private storage will be deleted. Starting the fileName with // is an error because asset files cannot be deleted.

Taifun

[Anke]

@agnes_fazio

I want to delete the image

Use the TaifunFile extension (especially on Android 11+) if you do not want to request and grant storage permissions (because you do not need them for images / files created by the app itself).

[agnes_fazio]

non je ne veux pas demander d'autorisation, mais avez vous des exemples avec les blocs ?

[Anke]

@agnes_fazio

examples with the blocks

Show your relevant blocks (for saving / downloading the image).

[agnes_fazio]

je ne les ai pas

[agnes_fazio]

j'ai fais ça et maintenant je voudrais supprimer en cliquant sur un bouton

[Taifun]

it would have been nice to switch the language to
english before taking a screenshot...

these blocks do not make sense... remove them...

also it looks like you do not download images, you pick images using the image picker, isn't it?
so after picking an image you like to delete it from the device?

Taifun

[Anke]

Also you topic ("Comment effacer des images") doesn't make sense.

How to ask a question (open new topic)

Before you ask a question / open a new topic please take care of the following points: The forum was previously searched for similar topics / issues. Give a precise (detailed) description of the issue / bug, the goal. Show the (relevant) blocks (images, screenshots of blocks in high quality). Debug your blocks (connect to Companion and right mouse click: → Do it). Name the Android / iOS version running on your (test) device. Do not open multiple threads on the same topic. If you haven't al…

[agnes_fazio]

oui Taifun c'est ce que je souhaite faire , supprimer une image

[Taifun]

It sounds simple, but unfortunately it is not simple to delete an image your app does not own...

Some basics on Android storage system

From an Android point of view there are an → Internal Storage and an → External Storage . 1. Internal Storage The Internal Storage can only be accessed with a rooted device. 1.1 The app package is saved in /data/data/<packageName>/ In order to be able to debug your app, AI2 saves the assets for → Companion on devices with Android ≥ 10 (API ≥ 29): /storage/emulated/0/Android/data/edu.mit.appinventor.aicompanion3/files/assets/ Android < 10 : /storage/emulated/0/Android/data/edu.mit…

You will have to use SAF

SAF: App Inventor implementation of Storage Access Framework

1.Introduction Description: Basically AI2 wrapper of Storage Access Framework. Using this extension, you can get read and/or write access to a single document or tree document (and all of its children recursively). Latest Version: 1.3 Released: 2021-09-16T18:30:00Z (UTC) Last Updated: 2023-11-15T18:30:00Z (UTC) 2.Blocks [image] [image] [image] [image] [image] [image] [image] [image] [image] 3.Documentation Events ErrorOccurred Event indicating error/excep…

Taifun

[agnes_fazio]

j'ai une image car je la télécharge et ensuite je veux la supprimer

[Taifun]

In your screenshot you are using an image picker... you did NOT download an image, at least not in your screenshot ..

You might want to read again how to ask questions so we do not have to continue guessing...

How to ask a question (open new topic)

Before you ask a question / open a new topic please take care of the following points: The forum was previously searched for similar topics / issues. Give a precise (detailed) description of the issue / bug, the goal. Show the (relevant) blocks (images, screenshots of blocks in high quality). Debug your blocks (connect to Companion and right mouse click: → Do it). Name the Android / iOS version running on your (test) device. Do not open multiple threads on the same topic. If you haven't al…

Taifun

[agnes_fazio]

le problème c'est que je ne suis pas experte dans appinventor, je débute. Donc j'essai aussi de comprendre vos réponse c'est pas évident pour moi.
Ma question est : comment je peux faire pour supprimer une image que j'ai téléchargée , je ne veux pas en retélécharger une autre je veux que l'emplacement soit vide

[SteveJG]

@Taifun

You will have to use SAF

to delete from the folder you downloaded the file image to. There is not a simple way to do this.

You probably need to use SAF and this Block:

[Anke]

@agnes_fazio

an image that I've downloaded

It seems that you understand "download" differently than we do. Download means that a file/image has been downloaded to your device via a URL address (from the internet).

[agnes_fazio]

non pas sur internet , téléchargé dans ma galerie du téléphone