First you need to set up Google Android SDK. While creating Android Virtual Device (AVD) you can specify the storage size in SD Card settings. You can specify any size upto 128 GB. Its really helpful if you want to install .apk applications on Emulator.
Your decision to start development on a new platform depends on how easy it is to write a “Hello World”. This tutorial helps you set up the development environment and write “Hello World” in few easy steps. This tutorial assumes that you are already familiar with eclipse and its installation.
The APIs stuff is just making life easier.
Gadgets are like small applications we play with at different platforms.
Google already have gadgets platform available at iGoogle. Now google introduced Gadget Ads for Adwords. Now you can have more interactive ad campaigns with gadget ads.
Google gives a lot of AJAX solutions through AJAX APIs that the developers love to use. APIs need a little attention to be implemented.
How do you believe and get courage of using new things until and unless you have a live visual demo of that.