CODEWITHSUNDEEP
androidmvvmkotlindata-binding
Meenakshi Sundaram
Meenakshi Sundaram

Reputation: 21

How to Enable/Disable a button based on all editetext is not empty using viewmodel and databinding in kotlin android

I need to create a Login Activity in an Android app using Data Binding with ViewModel using Kotlin. I want to enable/disable a Button based on the content of an EditText field. The expected behavior that I'm trying to achieve is the button should get enabled only when none of theEditText fields is empty.

Upvotes: 1

Views: 2618

Answers (3)

Sanjay Kakadiya
Sanjay Kakadiya

Reputation: 1636

Step 1: In ViewModel declare

var isEnabled : ObservableBoolean? = null and initialize it in init block.

Step 2: Set value of isEnabled in your Text Change Listener like

isEnabled?.set(!isLoginFormValid())

Step 3: bind variable in xml file like

android:enabled="@{viewmodel.isEnabled}"

Upvotes: 3

Ryujin
Ryujin

Reputation: 443

Add a boolean MediatorLiveData in your ViewModel and bind this to the enabled attribute of the button.

You should have MutableLiveData fields that's two-way bound to your EditTexts. Add these as MutableLiveData as sources to the boolean MediatorLiveData so that it can observe changes to the EditTexts as user enters values.

Add whatever logic in the MediatorLiveData observers to set it's value to true/false depending on whatever logic you want (e.g. values of the EditTexts should not be null or empty)

Upvotes: 1

karan sandhu
karan sandhu

Reputation: 171

you can put validations in the on click method of the login button.like:-

if(edittext_one!=null){then do the code here for the onclick }

like this you can put as much validations as you want on the edittext using if else statements.i hope this helps

Upvotes: 0

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