How to stop a text message from sending on a android?

Now you know we all send the one message or to by mistake how do you stop it before it goes thou on a android normal phones you using push the end button/ power button but android power button just turns screen off but still sends message hit back button just goes back to whatever you just came from but still sendings message and home button well just goes goes to home screen but still sends message... If this helps my phone is the samung Galaxy Prevail for boost