Retaining focus on Edittext within OnFocusChanged Listener

Question

I am trying to set up a system to validate user input, in this case, just checking that there is anything entered by the user.

I have a Utility class that checks that the EditText has data.

I am using an OnFocusChangeListener which then calls the method from the Utility class.

This is the code from the activity:

editText = (EditText) view.findViewById(R.id.editText);
    editText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override public void onFocusChange(View v, boolean hasFocus) {

            if (!hasFocus) {
                if (Utility.checkInput(editText) == false) {
                    Toast.makeText(getActivity(), "Enter value!",
                            Toast.LENGTH_SHORT).show();
                    // TODO....
                    // Retain focus - do not allow user to move on.
                    // This is where I am lost...

                }
            }
        }
    });

This is the code from the Utility class:

public class Utility {
    public static boolean checkInput(EditText editText) {
        if (editText.getText().length() != 0) {
            return true;
        }
        return false;
    }
    //.../

1. Where I am stumped is how to retain focus if the check input returns false. I want to prevent the user from moving forward. I am sure there is a simple solution, but I have not found it.

2. I am also wondering if the xml ime.Options will affect this.
   Thanks.

EDIT

This is my xml:

<EditText
    android:imeOptions="actionDone"
    android:inputType="textPersonName"
    android:maxLength="24"/>

<spinner ../

<EditText
    android:imeOptions="actionDone"
    android:inputType="phone"
    android:maxLength="12"/>

When I use:

if (!hasFocus) {
    if (Utility.checkInput(name) == false) {
        Toast.makeText(AddDriverUserActivity.this, "Enter value!",Toast.LENGTH_SHORT).show(); 
         name.requestFocus();
      }
 }

The problem is, I am using action done (to hide the keyboard), as the user then selects from a spinner then proceeds to the next EditText. So the toast isn't showing until I touch the next edit text (phone) and the focus is then set on two edit texts:

When I reset:

android:imeOptions="actionDone" to actionNext it shows the toast and then proceeds to the next edittext, as shown in the screen shot, both are focused.

Request focus doesn't prevent it from moving from the edittext.

Answer 1

This isn't a solution to retaining focus within the EditText to validate input, but it is an elegant way to check for user input.

I add all my EditTexts to an array and pass them to a method that loops through the array and checks each for input.

In my Utility class:

public static boolean checkAllInput(EditText[] editTexts) {
    for (int i = 0; i < editTexts.length; i++) {
        if (editTexts[i].getText().length() == 0) {
            return false;
        }
    }
    return true;
}

In the activity/fragment:

I add the EditTexts to an array:

final EditText[] editTexts = {arg1, arg2, arg3, arg4, .../};

Then use the function in my OnTouchListener for the button.

addBtn.setOnTouchListener(new View.OnTouchListener() {
        @Override public boolean onTouch(View v, MotionEvent event) {
            hideKeyboard();
            disableButton(addBtn);
            if (Utility.checkAllInput(editTexts) == false) {
                Toast.makeText(getActivity(), "Enter all fields",
                        Toast.LENGTH_SHORT).show();
                enableButton(addBtn);
            } else {
                // Do something ..
            }
            return false;
        }
    });

I thought this might be helpful for others working their way through android.

As a side note, I have been disabling my buttons, to prevent repeated touches:
Using countdown to set button enabled

Answer 2

Use View.requestFocus()

// Retain focus - do not allow user to move on.
editText.requestFocus();