WolframAlpha quicklaunch for Android keyboard installation.
Menu > Settings
Goto 'Local & Text' or 'Keyboard' Depending on your device type.
Check the box for Math Keyboard. Don't worry about the pop up, if you are afraid the keyboard is a key logger don't use it for important info!
Now goto a text field and touch and hold it to get this context menu
Select the Math Keyboard and now you are good to go!