Keyboards in smartphones have evolved to help people type quickly. There are features such as auto correct, word suggestions and gesture typing which allows us to be as quick as possible. When compared to physical keyboards, on-screen soft keyboards have the possibility of being flexible. That means keyboards can be resized, dictionaries can be updated and fingers can be slide across the keys to generate the exact word.
There are already a few Android keyboards with the finger swiping feature that are available for free. Here are 4 of those:
Swype Keyboard by Nuance Communication. The trial version allows you to choose languages and use the "swiping finger over keys" method to type. This version is limited to 30 days but till the trial period is over you can enjoy this great app. The upgrade costs $0.99 only but there are other free keyboards mentioned above which will give you similar features. For tablets, the design is flexible and switchable between a full screen layout, a small layout and a movable layout. The voice dictation feature supported by this app is also commendable.