package com.example.myapplication;

import android.content.Context;
import android.os.Looper;
import android.text.Editable;
import android.text.SpannableStringBuilder;
import android.util.AttributeSet;

import androidx.appcompat.widget.AppCompatEditText;

public class SDKEditText extends AppCompatEditText {
    SDKEditText(Context context) {
        super(context);
    }

    SDKEditText(Context context, AttributeSet attributeSet) {
        super(context, attributeSet);
    }

    SDKEditText(Context context, AttributeSet attributeSet, int defStyleAttr) {
        super(context, attributeSet, defStyleAttr);
    }

    @Override
    public Editable getText() {
        return new SpannableStringBuilder();
    }

    protected CharSequence getTextInternal() {
        if (Looper.myLooper() == Looper.getMainLooper()) {
            return super.getText();
        }
        return null;
    }
}

<com.example.myapplication.SDKEditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:gravity="center"
        android:inputType="number"
        />