android - How to show/hide password in TextFormField?

Question

Currently I have my password TextFormField like this:

TextFormField(
  decoration: const InputDecoration(
      labelText: 'Password',
      icon: const Padding(
        padding: const EdgeInsets.only(top: 15.0),
        child: const Icon(Icons.lock),
      )),
  validator: (val) => val.length < 6 ? 'Password too short.' : null,
  onSaved: (val) => _password = val,
  obscureText: true,
);

I want a button like interaction which will make password visible and invisible. Can I do it inside TextFormField? Or I will have to make a Stack widget to get my required UI. And how will the condition be made regarding obscureText true/false?

Answer 1

I have created a solution as per @Hemanth Raj but in a more robust way.

First declare a bool variable _passwordVisible.

Initiate _passwordVisible to false in initState()

@override
  void initState() {
    _passwordVisible = false;
  }

Following is the TextFormField widget :

TextFormField(
   keyboardType: TextInputType.text,
   controller: _userPasswordController,
   obscureText: !_passwordVisible,//This will obscure text dynamically
   decoration: InputDecoration(
       labelText: 'Password',
       hintText: 'Enter your password',
       // Here is key idea
       suffixIcon: IconButton(
            icon: Icon(
              // Based on passwordVisible state choose the icon
               _passwordVisible
               ? Icons.visibility
               : Icons.visibility_off,
               color: Theme.of(context).primaryColorDark,
               ),
            onPressed: () {
               // Update the state i.e. toogle the state of passwordVisible variable
               setState(() {
                   _passwordVisible = !_passwordVisible;
               });
             },
            ),
          ),
        );