If you want to sell the Android apps you developed, you can offer them through Google's Android Market. If you'd rather sell apps directly through your website, however, Google will permit that, provided your creations meet the requirements for Android-compatible apps. If it does, Android users can download the app from your website or you can send it to them via email. The user will, however, have to configure his Android phone to accept non-Market Android apps.

1 Prepare your apps for release. Even apps selling outside Android Market have to complete certain steps before Android will accept them. Configure and optimize the code for each of your apps, debug it, then test it to verify that it works as you expect it will.

2 Sign your applications. Nothing goes on the Android system unless it has a digital signature identifying the designer. Google doesn't maintain a central signing authority, so self-signed certificates, using standard tools such as Keytool (keytool.sourceforge.net) or Jarsigner (download.oracle.com/javase/1.3/docs/tooldocs/win32/jarsigner.html), are sufficient. Android recommends that you use the same signature on all of your apps so that the signature on any upgrades matches the original.

3 Design your website for app sales. When visitors access your website, they should see exactly what apps you're selling as well as a vivid display of what your apps do. Make it as easy as possible for users to find the apps they want -- too many confusing choices discourage sales -- and to buy them with as few clicks as possible.

4 Promote your marketplace. Describe your apps on your site using keywords that will draw users Googling the topic. Mention the apps in social networks or create a Facebook page for them. Contact Android review sites to see if they'll try your apps and, hopefully, recommend them.

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