How can I get whether textBox is changed in Android Activity?
<p>I have a activity contains many edittexts. How can I know whether the user have input or change the content of the edittext?</p>

<p>Not check one edittext, there are many edittexts in the activity. If one of them has been changed. While the user leave the activity, I need tell he/her, the information is not saved.</p>
