Android Keyboard [duplicate]

This question already has answers here: 开发者_高级运维 Closed 10 years ago.

Possible Duplicate:

How to develop a soft keyboard for Android?

How to add a new key in android keyboard.

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You will need to write your own input method editor (IME), perhaps cloning the existing one from the Android open source project. Then, you will need to install that IME in your phone. Here is an article covering some of the steps.