How to extract integers from alphanumeric string in your Android App?

Описание

In this video it shows how one can extract or filter all the digits (integers) from any alphanumeric string/ texts.

It uses replaceAll method of the string to replace any non-numeric character with null (that is delete the non-numeric characters).

In demo it shows how from our email ID - programmerworld1990@gmail.com - the numbers 1990 is pulled out.

One can also convert the numerical string into int data type by using the below API:
Integer.valueOf(stringOfIntegers)



I hope you like this video. For any questions, suggestions or appreciation please contact us at: https://programmerworld.co/contact/ or email at: programmerworld1990@gmail.com

Complete source code and other details/ steps of this video are posted in the below link:
https://programmerworld.co/android/how-to-extract-integers-from-alphanumeric-string-in-your-android-app/

However, the main Java code is copied below also for reference:


package com.programmerworld.integersfromalphanumericstring;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

private TextView textView;
private EditText editText;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

textView = findViewById(R.id.textView);
editText = findViewById(R.id.editText);
}

public void buttonExtractIntegersFromString(View view){
String stringInput = editText.getText().toString();
String stringIntegers = stringInput.replaceAll("[\\D]", "");
// int intString = Integer.valueOf(stringIntegers);
textView.setText(stringIntegers);
}
}

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