Validating all EditText fields before enabling button?

Question

I have several EditText fields (such as Name, Address, etc.) that I want to validate/check if they are empty or not. If all of them are filled, I want to set my Enter button to enabled. If even any one of the fields are empty, I want to disable the Enter button.

I have written my code below but my button is not being enabled even after all my fields are already filled. I'm using a bunch of boolean variables to determine whether the condition is met.

I'm not sure where I went wrong since my app runs ok but not the desired results that I want which is disabling the Enter button if one or all of my fields are empty.

My variables:

boolean filledName, filledAddress = false; //These variables will determine if my fields are empty or not
EditText  name, address;
Button btnEnter;

My onCreate:

protected void onCreate(Bundle savedInstanceState) {

...
//Get views from layout xml via IDs
name = (EditText) findViewById(R.id.name);
address = (EditText) findViewById(R.id.address);
btnEnter = (Button) findViewById(R.id.btnEnter);

btnEnter.setEnabled(false); //initialize the Enter button to be disabled on Activity creation

...

And my Add Text Changed Listeners inside my onCreate :

name.addTextChangedListener (new TextWatcher() {
   @Override
   public void onTextChanged(CharSequence s, int i, int i1, int i2){
        if (!(name.toString().trim().isEmpty()))
           filledName = true;      //if name field is NOT empty, filledName value is true
   }
   ....
   //other implemented abstract codes here
});

address.addTextChangedListener (new TextWatcher() {
   @Override
   public void onTextChanged(CharSequence s, int i, int i1, int i2){
        if (!(address.toString().trim().isEmpty()))
           filledAddress = true;     //if address field is NOT empty, filledAddress value is true
   }
   ....
   //other implemented abstract codes here
});

//This should set the Enter button to enabled once all the boolean conditions are met
//but for some reason it's not working
if (nameFilled == true && addressFilled == true)
   btnEnter.setEnabled(true);

} //end of onCreate()

Answer 1

I do not recommend you to save a boolean, because you also have to change it to false when the field is empty again.

I think that is better to do this:

protected void onCreate(Bundle savedInstanceState) {
    //......

    name.addTextChangedListener (new TextWatcher() {
       @Override
       public void onTextChanged(CharSequence s, int i, int i1, int i2){
            checkRequiredFields();
       }
    });

    address.addTextChangedListener (new TextWatcher() {
       @Override
       public void onTextChanged(CharSequence s, int i, int i1, int i2){
            checkRequiredFields();
       }
    });

    //......
}

private void checkRequiredFields() {
    if (!name.getText().toString().isEmpty() && !address.getText().toString().isEmpty()) {
       btnEnter.setEnabled(true);
    } else {
       btnEnter.setEnabled(false);
    }
}