Here’s a quick tip to spice up your Android applications. A lot of people perform Android input validation when a button is pressed and display the validation message in a dialog as shown below.
However, there’s a much easier (and elegant way) to do this by using the built in setError construct of the EditText class in Android (note, I’m only talking about EditText in this instance). Using this method, you will get built in support for the EditText **validation control. By using the **setError method you will receive validation as shown below in the Qonqr Android app (Currently in development for release in Q1 of 2012).
To get these free validation controls you simply need to perform validation on the EditText at any time during the runtime execution of your app. This could be after a button is pressed, via a Text Changed Listener or via any other method. Once you determine that your input is invalid simply call the setError method on the EditText instance as shown below.
EditText firstName = (EditText)findViewById(R.id.first_name);
if( firstName.getText().toString().length() == 0 )
firstName.setError( "First name is required!" );
… and BINGO, you now have a free icon show up in the right hand side of the EditText as well as a popup validation message that shows up. As soon as the user starts typing in the EditText, the validation icon and message will disappear. 🙂 Enjoy!
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Great Article, I have always wondered how to achieve this. Many thanks for sharing
I’ve got a quick question about your EditText’s are they the standard Android ones with no changes? They look much better. What value did you use for the height?
Thanks in advance
Hello sir Android is new for for i just try Your code to apply validation to EditText in my database application but it not work .when i press button without filling EditText the android emulator shows “Force Quit dialog box”.i dont understand wats going wrong plz help
woah!! thanks, this is very helpful for me! 😀
btw i love the book you wrote, it very useful for beginner developer like me 😀
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Do u have complete Source code of above demo.if yes the please forward me.
Excellent…
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I wrote a class that extends EditText which supports natively some validation methods and is actually very flexible.
You can check it out here: https://github.com/vekexasia/android-form-edittext
Hope you enjoy it 🙂
nice work!
Brilliant! Was just looking for a validator! Much appreciated
nice article ……
Good blog for beginner
Thanks, didn’t know that.
thank you so much for such a nice and simple tutorial…
Nice tutorial, I have written a validation library for Android that uses annotations to enforce constraints on UI widgets. You can also write your own rules if the Annotations or the built-in rules are insufficient. You can check the library from here – https://github.com/ragunathjawahar/android-saripaar
Helpful 🙂
nice
Wow … I didn’t know this … This blog saved a lot of time for me … Cheers ..
thanks buddy…pop box not going automatic when i start enter txt…any idea here?
Do you know if there is a way to change the text size for the error text?
HI sir
How to display ALL Error message in ONE alert dialog box ?
Great man. I’ve never seen this in any app.
Thanks Donn, this helped, may the force be with you.
simple n very effective thanks 🙂
it works with me separately with one text field but when i use it with another one it doesn`t work what can i do?
else if(emailValid()==0&&phoneValid()==0){
text.setError(“Error Email”);
phone.setError(“Error Phone”);
}
You can use Toast.makeText(Context context, int resId, int duration)
Hi sir, how to ensure that the password field match with the confirm password field.?
Had no idea. Thank you Donn Felker. Cheers!
can u tel me button in the above tutorial image…how can i create button like that..
i find it …thanks..to give …new creative idea..
Hi. I tried to use EditText.setError(“Error”) for EditText that placed within a PopupWindow. I wonder if you know if setError works for EditText in PopupWindow. Because I tried create project from scratch and setError works perfectly within single layout, but app crashes if I use setError on EditText in PopupWindow. Appreciate your answer.
Awesome! Thanks!
Hello, I really appreciate your tutorial. It’s very clear and succinct. Could you please help me on another situation using Error messages? I’m using an error message in the follow situation: if I click on button and there isn’t an iformation setted at editText show the error message, so I can’t pass to another fragment, but when I click this button and show the error message and I change the fragment throught drawer item, the error message stay at the new fragment. Do you know how to solve the problem or indicates another tutorial for me please?
Hey Donn,
Cheers for showing us this, it’s very handy! Is there any chance you can point me in the right direction when it comes to designing a layout like the one you have shown? I’m finding it very difficult to get a handle on them!
i’m trying to put this on my code but didn’t work, once i click on my save button to save that on a SQLite DB it doesn’t works… could you help me please?
String enteredUserName = userName.getText().toString();
String enteredPassword = userPassword.getText().toString();
if( enteredUserName != ” ” && enteredPassword != ” ” ) {
createNewAccount();
}
this if not working, why?????
thanks a lot
for name it is not working properly.. without entering data into any field of the form., if you submit, then its stopping application. The error msg is like this “Applicaiton stopped unfortunately” . help me out. [email protected]
That is awesome! This was the answer I was looking for! Thanks for a great example of built in validation control, it has made my field level validation look great and work great with one simple code change!
Thank very much , God bless you Mr DONN FELKER
How too add special character validation
Thanks for this!
Have you solved this issue?
Best,
Gary
192.168.1.1
Beware on screen rotation because the error disappear after it. You have to store error message (EditText.getError()) when onSaveInstanceState is called and call setError again after the layout is created. When you use it in AlertDialog with custom view, it’s a little bit tricky to call setError after rotation, because layout is created when dialog is shown. You have to register listener in AlertDialog.setOnShowListener(…) and call it here.
Sir how can i also bind my mark text field not more than 100 ? please help
best regards 🙂
how can download source this codes please T_T?
This is great Man! saves me time, thanks for the tut