OPTION #1: Slow down an re-read every step. (Source).
Basic Setup for Signing.
Before you begin, make sure that the Keytool utility and Jarsigner
utility are available to the SDK build tools. Both of these tools are
available in the JDK. In most cases, you can tell the SDK build tools
how to find these utilities by setting your JAVA_HOME environment
variable so it references a suitable JDK. Alternatively, you can add
the JDK version of Keytool and Jarsigner to your PATH variable.
...
Eclipse Users
If you are developing in Eclipse/ADT (and have set up Keytool and
Jarsigner as described above in Basic Setup for Signing), signing in
debug mode is enabled by default. When you run or debug your
application, ADT signs the .apk file with the debug certificate, runs
zipalign on the package, then installs it on the selected emulator or
connected device. No specific action on your part is needed, provided
ADT has access to Keytool.
OPTION #2: Test the features required by your application with an unsigned '.apk'. (Source).
You can use the aapt tool, included in the Android SDK, to determine
how Google Play will filter your application, based on its declared
features and permissions. To do so, run aapt with the dump badging
command. This causes aapt to parse your application's manifest and
apply the same rules as used by Google Play to determine the features
that your application requires.
To use the tool, follow these steps:
First, build and export your application as an unsigned .apk. If you
are developing in Eclipse with ADT, right-click the project and select
Android Tools > Export Unsigned Application Package. Select a
destination filename and path and click OK. Next, locate the aapt
tool, if it is not already in your PATH. If you are using SDK Tools r8
or higher, you can find aapt in the /platform-tools/ directory.
Note: You must use the version of aapt that is provided for the latest
Platform-Tools component available. If you do not have the latest
Platform-Tools component, download it using the Android SDK Manager.
Run aapt using this syntax:
$ aapt dump badging <path_to_exported_.apk>