Mask an EditText with Phone Number Format NaN like in PhoneNumberUtils

Question

I want to make user inputted phone number in an editText to dynamically change format every time the user inputs a number. That is, when user inputs up to 4 digits, like 714

Answer 1

The above solutions do not take backspace into consideration so when you delete some numbers after typing, the format tends to mess up. Below code corrects this issue.

phoneNumberEditText.addTextChangedListener(new TextWatcher() {

        int beforeLength;

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            beforeLength = phoneNumberEditText.length();
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            int digits = phoneNumberEditText.getText().toString().length();
            if (beforeLength < digits && (digits == 3 || digits == 7)) {
                phoneNumberEditText.append("-");
            }
        }

        @Override
        public void afterTextChanged(Editable s) { }
    });

Answer 2

My script, example taken from here description here

---

<android.support.design.widget.TextInputLayout
    android:id="@+id/numphone_layout"
    app:hintTextAppearance="@style/MyHintText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"

    android:layout_marginTop="8dp">

    <android.support.design.widget.TextInputEditText
        android:id="@+id/edit_text_numphone"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/MyEditText"
        android:digits="+() 1234567890-"
        android:hint="@string/hint_numphone"
        android:inputType="phone"
        android:maxLength="17"
        android:textSize="14sp" />
</android.support.design.widget.TextInputLayout>

---

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
 TextInputEditText phone = (TextInputEditText) findViewById(R.id.edit_text_numphone);
 //Add to mask
    phone.addTextChangedListener(textWatcher);
}


   TextWatcher textWatcher = new TextWatcher() {
    private boolean mFormatting; // this is a flag which prevents the  stack overflow.
    private int mAfter;

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        // nothing to do here..
    }

    //called before the text is changed...
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        //nothing to do here...
        mAfter  =   after; // flag to detect backspace..

    }

    @Override
    public void afterTextChanged(Editable s) {
        // Make sure to ignore calls to afterTextChanged caused by the work done below
        if (!mFormatting) {
            mFormatting = true;
            // using US or RU formatting...
            if(mAfter!=0) // in case back space ain't clicked...
            {
                String num =s.toString();
                String data = PhoneNumberUtils.formatNumber(num, "RU");
                if(data!=null)
                {
                    s.clear();
                    s.append(data);
                    Log.i("Number", data);//8 (999) 123-45-67 or +7 999 123-45-67
                }

            }
            mFormatting = false;
        }
    }
};