I am thinking of making an app for android in which if I select a word in any other app in android phone then a strip come above it. In this strip there is a button named meaning if user click on this button, then its meaning come as a pop-up or in form of notification. These meaning will come from a database of dictionary which will be provided with app.
I just want to know how to change accessibility settings of phone so that if any word is selected anywhere in the phone, strip with meaning button come.