replace Contacts in android - android

I wrote a Contacts app (with better searching) for android. Now I want to make my app open (given option to choose native contacts or mine) when users click "Contacts" in home screen or in app drawer. I know that I need to add some intent-filter to achieve this. Please tell me which code should I add in XML.

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Possibility of extending Android phone call functionality

On a call android searches your contact list and shows the contact name if available, and if the number is an anonymous caller it just shows the number.
Now I want the call system to check a specific source (an XML file or a database file) after ending up searching in contact list and if the number is found in the source then show the name from the source.
Is it totally possible to add such thing to a built-in android function? If yes, could you please give me a clue to start from?
If you make a custom dialer app, sure. A special way to add it to any existing dialer app, not really.
Hm, I guess you could do similar like 2gis dialer App. They just open custom dialog over the default dialer. See left screen for example
Here another screens:
First, Second, Third

Add Android App in "select an action" menu

I´m looking a way to add my app in select an action menu that appears when one user wants to add one picture in another app (i.e chats apps).
So, when the user selects that option, android lists the apps like camera, gallery, and others.
Well, i want to appear in that menu. i know it is possible (intents, intents filters ?), but I couldn`t get the answer :(.
thanks, and sorry for my baad-bad english :$
Adding yourself to the menu can be done as outlined in this question. Actually providing a response can be done as seen here.

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

Searching within my own application

So im building an Android application and want to include a search feature to let users use it instead of having to look through the apps many activities and pages. Cant seem to find any info on the best way to do this anywhere else. Thanks in advance
Ok so im building an app that will serve as a game guide for a popular PS3 game. Within the app will be many subjects and topics and i would like to give users the ooption to just use a search bar on the main screen of the app to search throughout the entire application and then provide them with a list of results that are clickable and take them directly to the chosen activity or place in the application. (Say it was an app for making whiskey, i would want them to be able to search on the main page for Jack Daniels instead of hitting buttons that navigate from Mainpage>American Whiskey's>Bourbon>Jack Daniels. )

how to change the text to just the app name

I m creating an application that allows the user to choose an application that is already installed on there phone, I got a listview populated with all the apps on the phone but everything appears and most of the names dont look right, like "com.android.launcher"
I just want all the apps names appearing like the "safety.app" in the picture and not the rest of them like the "com.android.launcher".
I am currently using the code "packageInfo.packageName" to get the list of apps
Does anyone know how to just get the names of the apps to appear here?
Does this do what you want?
packageInfo.applicationInfo.loadLabel(getPackageManager()).toString();

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