Add a "Share/Send To" capability to an Android app - java

I am developing an Android app that has the feature of converting a video to an audio file.
I want to add a feature that makes the user able to enter his studio, then when they click on the video-share option (to share the video), to find my application icon at the bottom. Without the need to open the application.
How can I do that?

the answer is this share/receive guide
thanks VC.One that is exactly what i need

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Automatically launch an app and click a button in it

I want to automatically launch an application and click a button in it through another application like this.
I know it is some Accessibility settings needed to be enables for that app. But I don't know how to code it. I would appreciate the help. Thanks in advance
Icant understand exactly whats your goal but if i understood, Maybe you're looking for deeplinking
Flutter supports deep linking on iOS, Android, and web browsers. Opening a URL displays that screen in your app.
See the documentation here
Deep linking

How do I give a user an option to use my app as default with android

I am making an app that is filtering videos through ID when a link is clicked through deep links. It works but the user has to set the app to open as default. How do I make the little window asking if they would always want to open YouTube links with my app within an activity?

Instagram follow on button click

I'm currently trying to add a feature which allows users to follow an instagram account by clicking a button. I've seen other apps use that but I could not figure out how. As you can see in this post, following people by using the api is no longer availible. https://developers.facebook.com/blog/post/2018/01/30/instagram-graph-api-updates/
Maybe some of you know how to do what I want.
You can do it with a hack that is..
Intent externalIntent = new Intent(Intent.ACTION_VIEW,Uri.parse("instraURL"));
startActivity(externalIntent);
App will move user to external Browser and browser will move user on Instagram app..
As it is not perfect solution but i am just sharing because it can help developers when they don't have SDK.

Advice on developing a android photo vault app - File locking in android

I am new to android programming, I have developed 2 very simple apps, one is a weather and other is a story app.
I am planning to develop a app similar to photo vault app.
Similar to this - https://play.google.com/store/apps/details?id=com.enchantedcloud.photovault&hl=en
How complex is this? I am not able to find much information online to develop the app. Is there any way to copy over the files in the photo camera library to a new location and then hide them?
The app should basically do this:
1) Ask for a password, when user opens app. --> Easy DONE
2) Ask user permission to access the camera photo library --> Stuck :(
3) Let user select the pics he wants to copy and hide in the app --> Stuck :(
4) Copy these pics in a secret location? or encrypt them? --> Stuck need help here.
5) Save them and when the user needs access to them, ask for a pass and show them.
I am not planning to support videos yet, just hiding jpegs is good enough.
Any help would be appreciated. Thanks guys.
I have small hack over here. Try to get apk file of the above application and use Java decompiler(Kind of reverese Engineering) Java Decomplier to check what all java files how he organised it and what structure he followed and I am not sure that will decompile resource files even(xml) files. Hope it helps you a bit.

pop up window when message selected in other app - Android

Is it possible to pop up a window for a selected text within another android app ?
for example a user is using some pdf reader and selects a word and a small window pops up that provides the options to highlight the text or Define and ... , I want to know is it possible to add another option to that window (or add a small window next to that) that defines the meaning using my dictionary app, not the pdf reader's dictionary?
basically I want to know if it is possible to have the user to use my dictionary app for all his needs , surfing web, reading pdf , looking up words directly ..
No, its not possible.
Only way of do that if you upload your app to Google Play and shared the options with other apps (using PendingIntents and Broadcast actions), but the code of other apps must use your code, you can not modify other app installed.
If I have understood your question correctly then NO.
It is not possible to edit the behavior of other apps with your own since then you would have to edit that apps source code. As far as I know the system does not provide any overhead setting for what your asking as it does for sharing things whith different apps (email, social media etc.)

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