Android app appearing on gallery shares - android

I've been searching how to make an application appear in the Gallery share menu but I haven't find anything. There's a similar question here in SO but it hasn't been answered (link: How to let my app show up as a gallery?).
So, summing up:
I am trying to make a Whatsapp emoji application and I'd like to provide my users a direct access to the app via whatsapp, and the best way of doing it that I've seen is what other emoji apps in the market do, as you can see in the following image:
I'm pretty sure it's achieved via intent-filters or something like that but I haven't found any solution.
Thank you in advance!

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I want to add a button to my site so that when a user clicks it, it opens a new note on the Evernote app and saves a specific message.
I've looked everywhere for this but didn't find any info about it.
Is this possible?
Edit:
I'm sorry the question isn't very specific but I'm not really sure on where to start.
So, what I was asking was is there was a way to create a link with an href that would open in the Evernote app. So:
Is it possible to add an href that will open on the Whatsapp app? (I've seen that something like evernote:// should do it, but how's the syntax of this and does this work in both iOS and Android?)
Is there code in Javascript that would do the requested? (opening the Evernote app with a text that I would choose).
Once again, thanks for the help!

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I have searched a lot but nothing lead me towards this what i am trying to do, so i am here to take expert's opinion, is it possible to change the google text or icon shown in screenshot i have attached in question, somehow i kind of know this that it is nearly impossible but there is a load of geniuses in world who can make anything possible so guide me how can i do it in any app?

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I'm currently working on a Android photo management app. I would like to have "Instagramm like" photo filters. But actually Android can do it much better itself with the pre-installed Photo App.
See here:
The App on the right hand side is the one I'm referring to:
I already had a look at the developer guides but nothing is described there.
http://developer.android.com/reference/android/content/Intent.html
In general: How can I make use of those filters without implementing them on myself and without forcing the user to switch between apps.
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Having a problen to develop lockscreen for android

I want to develop an android application that will be an alternative lockscreen.
I searched a lot and i couldn't found an explanation about how to make an app to work like a lockscreen. I understand that there is no official android API for lockscreens, but there must be way, because there are a lot of alternative lockscreens applications in the market.
Does someone know how could i make my app work like a lockscreen? Or if there is a basic code out there of lockscreen app that i can learn from it how to do it?
Thanks a lot (:
The way this is usually accomplished is creating an app that becomes the home application and then when the screen is turned on display your custom lockscreen and hide it when the user successfully unlocks it so they can use the device.
Make sure to take a look at the numerous questions on SO that are very similar to this.

How can I have my activity display in android contact menu, like i.e. facebook app?

I would like to launch my android application from a contact menu which is displayed after clicking on a contact shortcut on android desktop, like on attached graphic.
I couldn't find any materials on this in docs, but I think it should be possible, as i.e. facebook application puts it's icon in this menu. I tried to find something in it's AndroidManifest.xml file but with no effect (I'm not familiar with android development so I don't even know what to look for - Activity, intent, intent-filter, provider?
I would appreciate link to docs or at least hint on terminology to google for.
//edit
It seems that my question is duplicate of : How to integrate your app in QUICK CONTACT on the native contact app on android? which has some helpful resources.
They are called quick actions in android by the way..
Here is a nice tutorial

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