If you want to access our US Street Address API or US ZIP Code API from an Android app, the SmartyStreets Java SDK can make it a lot easier. Although it is not specifically an Android SDK, it is fully supported in Android.
The easiest way to install this SDK is by using Apache Maven through Android Studio.
You can find source code of the SmartyStreets Android/Java SDK repository on Github which contains many sample code snippets.
Here are a few examples showing how to use the Android SDK: