How to install Android SDK in Eclipse on Mac

1. Go to the Top menu and chose Help / Install New Software... you will see something like this:

2. As you can see you have to enter Name for the plugin (e.g. Android plugin) and the URL where it is located https://dl-ssl.google.com/android/eclipse

3. Press OK. (If you will do it for the first time you will be able to click OK).

4. Then just follow the instruction of plugin installation process.

Check this link for more details http://www.talkandroid.com/guides/developer/android-sdk-install-guide/

How to implement the volume control of your Android application with the device volume controls

If you want to control your application volume on Android with the device volume controls (keys, buttons, etc) just put this line of code to onCreate method in your class that extends Activity:

setVolumeControlStream(AudioManager.STREAM_MUSIC);

Read more about this feature on this link http://stackoverflow.com/a/674207

Free Cloud Databases

If you're looking for a Free database on Cloud 

consider these options:

XEROUND
Up to 10MB at no charge. Best suited for small web apps and development or staging purposes.http://xeround.com/mysql-cloud-db-overview/pricing/

Amazon SimpleDB
It could be useful for very basic use cases
http://aws.amazon.com/simpledb/

Google AppEngine Data Store
https://developers.google.com/appengine/docs/quotas?hl=ru#Datastore

Cleardb
Price: FREE. DB Size: up to 5MB. Connections: 10. I/O Performance: Low. Daily backups.
Great for getting started and developing your apps.
Database.com

CouchDB
NoSQL, it's FREE
Read this article: Why Large Hadron Collider Scientists are Using CouchDB.

Microsoft SQL Azure Database
FREE???
http://www.windowsazure.com/en-us/