In this tutorial, we will learn, how to read 2 numbers out of 2 EditText fields, parse them into integers, add them and then display the sum in a TextView after clicking a button.
activity_main.xml Code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | <?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#00BCD4" tools:context=".MainActivity"> <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:background="#673AB7" android:text="Add" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/textViewResult" /> <EditText android:id="@+id/editTextNumber2" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:ems="10" android:hint="Enter Second Number" android:inputType="number" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/editTextNumber1" /> <EditText android:id="@+id/editTextNumber1" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_marginTop="30dp" android:ems="10" android:hint="Enter First Number" android:inputType="number" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> <TextView android:id="@+id/textViewResult" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:text="0" android:textSize="50dp" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/editTextNumber2" /> </androidx.constraintlayout.widget.ConstraintLayout> |
MainActivity.java Code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | package com.example.addition1; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class MainActivity extends AppCompatActivity { EditText editTextNum1; EditText editTextNum2; TextView txtResult; Button btnAdd; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); editTextNum1=(EditText) findViewById(R.id.editTextNumber1); editTextNum2=(EditText) findViewById(R.id.editTextNumber2); txtResult=(TextView) findViewById(R.id.textViewResult); btnAdd=(Button) findViewById(R.id.button); btnAdd.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int num1=Integer.parseInt(editTextNum1.getText().toString()); int num2=Integer.parseInt(editTextNum2.getText().toString()); int result=num1+num2; txtResult.setText(String.valueOf(result)); } }); } } |
Output:
