Develop Reference

Is it possible to open Android Google Map voice search?

I would like to open this directly from my program, is it possbile?
I checked this, but cannot found relevant information
https://developers.google.com/maps/documentation/android-api/intents
If it is impossible, is there any alternative way?

You can't do that from your activity.
In the image above you can see a dialog that catches the voice of the user, this is because Google Maps calling an intent ACTION_RECOGNIZE_SPEECH, and you can't start an intent and after calling Maps.

Here is the only documentation that I found on the internet for that question. The Adding Voice Capabilities. Just remember that these voice actions are task-based and are built into the Wear platform. So you need to use Android wear for that, see Maps API on Android wear.
Just read the two documentation to understand more. Also take note, that do not violate any terms of service on the Google Maps. Here is one example question for that.
So far, I have not used this voice capablities, so I'm not sure if it will really help you, but I think I give you a small idea with it. Goodluck and Happy coding :)

Transfer File via Bluetooth with Android

i want to code an application which enable file sharing via Bluetooth with android, but i can't find samples which i can base on. Please can someone give me links to some samples.

There is really a lot of info all over the place about this.
A good starting point is always the documentation it also has examples too!
As was mentioned a quick google search should have given you a lot of examples programs but here is one anyways.

Android Source Codes, Custom Controls, Open Source Libraries

As I was googling, I found lot of codes and libraries. But all of them
are on different sites and could not find any managed site.
like for iPhone : http://cocoacontrols.com/
Is there any such site where I can find codes for Custom Controls..
I know some of top favourite like github.com, anddev.org and Im following too.
Please reply any such site that you found useful.
Thanks

hie vishal, I don't think there is any specific site wherein you can find custom coding source codes. But yes the top favorite list that you have specified indeed have lot of in it.
Secondly, apart from those there are many other sites like
http://blog.pocketjourney.com/2008/03/15/tutorial-1-transparent-panel-linear-layout-on-mapview-google-map/
http://mindtherobot.com/blog/272/android-custom-ui-making-a-vintage-thermometer/
and many more according to your requirements. You can learn and take their references for your requirement.
There is a lot more on the developer site for styles and themes which can definately make use off.
Hope this is what you were looking for.

Android VideoCell jar, where and what is it?

Anyone heard of this:
VideoCell cell = new VideoCell(titleStr);
If so where can I get the .jar from? And information about it?

Sorry about that, I'm guessing you read this link: Android: Trying to get data from youtube api
I came across that article and thought it had something to do with the YouTube api, but on close examination, it looks like a user defined class.
Your best bet would be to contact the guy who wrote the code and see if he's willing to give you the code for it.

android app search button

I've been trying to make my app implement the built in quick search, similar to how it is done in ApiDemos' "app/search/invoke search". I have tried everything from trying to follow different examples, to copying the code exactly as it is in ApiDemos.
All I've found for the former have been concerned with older versions of the SDK, and simply not worked. As for the stuff that I can actually run and see working in ApiDemos, I've tried copying the following
com.example.android.apis.app.SearchInvoke.java
com.example.android.apis.app.SearchQueryResults.java
com.example.android.apis.app.SearchSuggestionSampleProvider.java
res/layout/search_invoke.xml
res/layout/search_query_results.xml
res/values/arrays.xml
res/values/strings.xml
res/xml/searchable.xml
... and everything under "Search Samples" in AndroidManifest.xml
This copying gets me a view that looks exactly like the one I'm facing when running ApiDemos, but when I click the search button, in the quick search box, Android always just opens up a browser window, with Google search results for the given query. I simply cannot find the critical component in ApiDemos that tells android that I want to use my own custom code for handling the search request.
I would really appreciate some help in this matter. Both documentation and other online resources seem very lacking when it comes to this.
Thanks.

For reference, four months (and god knows how many attempts) later, I've found the part of the documentation I've missed out on, that had the whole search box behave fire up browser search results, instead of passing them to my own activity. It all comes down to a little notice found here:
Note that all user-visible strings must be provided in the form of "#string" references. Hard-coded strings, which cannot be localized, will not work properly in search metadata.

Try reading this first. If that does not help, you can try looking at the search example from one of my books -- that example integrates with the Quick Search Box, and perhaps it will give you more clues.

In addition to the examples provided by commonsware.com, you can look at the Searchable Dictionary in the samples directory of the 1.6 SDK.
http://developer.android.com/guide/samples/SearchableDictionary/index.html

I was wrong before... the SDK documentation has a thurough explanation in the docs for SearchManager that I suggest you take a look at. In addition, as CommonsWare mentioned, the blog entry is also a good resource.