android Archives - Ebhor.com

Android Studio Hello World First Example

October 23, 2023October 22, 2023 by manish

Download and Install Android Studio: First, you need to download and install Android Studio on your computer. You can download it from the official website of Android Studio. The below program is developed with Android Studio Chipmunk | 2021.2.1 Patch 2 Create a new project: File->New ->New Project (Ctrl+Shift+N) Select a activity type here we … Read more

Simple Interest Calculator in Android

September 28, 2023September 28, 2023 by manish

SimpleInterest calculator in Android is developed to calculate the simple Interest in Android apps. Android Studio Chipmunk is used to develop this project. Simple interest formula is p*r*t/100 activity_main.xml The activity_main.xml file is an XML layout file used in Android app development. It defines the visual structure and components of the main user interface screen … Read more

Addition of two numbers in Android

September 28, 2023September 28, 2023 by manish

This is a basic program for Addition of two numbers in Android Steps to add two numbers Activity_main.xml

<?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"
    tools:context=".MainActivity">
    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="38dp"
        android:text="Addition of two numbers"
        android:textSize="34sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.496"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_wrapBehaviorInParent="horizontal_only" />
    <Button
        android:id="@+id/button"
        android:layout_width="295dp"
        android:layout_height="65dp"
        android:layout_marginTop="268dp"
        android:text="ADD"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.491"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:toggleCheckedStateOnClick="false" />
    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="368dp"
        android:text="Sum :"
        android:textSize="34sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.199"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <EditText
        android:id="@+id/editTextNumber"
        android:layout_width="296dp"
        android:layout_height="62dp"
        android:layout_marginTop="108dp"
        android:ems="10"
        android:inputType="number"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.495"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <EditText
        android:id="@+id/editTextNumber2"
        android:layout_width="295dp"
        android:layout_height="58dp"
        android:layout_marginTop="196dp"
        android:ems="10"
        android:inputType="number"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.491"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

<?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"

tools:context=".MainActivity">

<TextView

android:id="@+id/textView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="38dp"

android:text="Addition of two numbers"

android:textSize="34sp"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintHorizontal_bias="0.496"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent"

app:layout_wrapBehaviorInParent="horizontal_only" />

<Button

android:id="@+id/button"

android:layout_width="295dp"

android:layout_height="65dp"

android:layout_marginTop="268dp"

android:text="ADD"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintHorizontal_bias="0.491"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent"

app:toggleCheckedStateOnClick="false" />

<TextView

android:id="@+id/textView2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="368dp"

android:text="Sum :"

android:textSize="34sp"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintHorizontal_bias="0.199"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent" />

<EditText

android:id="@+id/editTextNumber"

android:layout_width="296dp"

android:layout_height="62dp"

android:layout_marginTop="108dp"

android:ems="10"

android:inputType="number"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintHorizontal_bias="0.495"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent" />

<EditText

android:id="@+id/editTextNumber2"

android:layout_width="295dp"

android:layout_height="58dp"

android:layout_marginTop="196dp"

android:ems="10"

android:inputType="number"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintHorizontal_bias="0.491"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.ebhor.addition;

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;
import android.widget.Toast;


public class MainActivity extends AppCompatActivity {
    EditText number1;
    EditText number2;
    TextView result;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        number1 = (EditText) findViewById(R.id.editTextNumber);
        number2 = (EditText) findViewById(R.id.editTextNumber2);
        result = (TextView) findViewById(R.id.textView2);
        Button add = (Button) findViewById(R.id.button);
        add.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                int num1 = Integer.parseInt(number1.getText().toString());
                int num2 = Integer.parseInt(number2.getText().toString());
                int sum = num1 + num2;
                result.setText("Sum :" + sum);
                Toast.makeText(MainActivity.this, "Sum :"+sum, Toast.LENGTH_SHORT).show();
            }
        });
    }

}

package com.ebhor.addition;

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;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

EditText number1;

EditText number2;

TextView result;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

number1 = (EditText) findViewById(R.id.editTextNumber);

number2 = (EditText) findViewById(R.id.editTextNumber2);

result = (TextView) findViewById(R.id.textView2);

Button add = (Button) findViewById(R.id.button);

add.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

int num1 = Integer.parseInt(number1.getText().toString());

int num2 = Integer.parseInt(number2.getText().toString());

int sum = num1 + num2;

result.setText("Sum :" + sum);

Toast.makeText(MainActivity.this, "Sum :"+sum, Toast.LENGTH_SHORT).show();

}

});

}

To validate we will use the Saripaar library. Add this library to the build.gradle in the dependencies section as below To use Saripaar in the program Overridden implementation is given below.

package com.ebhor.addition;

import androidx.appcompat.app.AppCompatActivity;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.mobsandgeeks.saripaar.ValidationError;
import com.mobsandgeeks.saripaar.Validator;
import com.mobsandgeeks.saripaar.annotation.NotEmpty;

import java.util.List;


public class MainActivity extends Activity implements Validator.ValidationListener {
    @NotEmpty(message = "Please Enter number1")
    EditText number1;
    @NotEmpty(message = "Please Enter number2")
    EditText number2;
    TextView result;
    Validator validator;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        number1 = (EditText) findViewById(R.id.editTextNumber);
        number2 = (EditText) findViewById(R.id.editTextNumber2);
        result = (TextView) findViewById(R.id.textView2);
        Button add = (Button) findViewById(R.id.button);
        validator = new Validator(this);
        validator.setValidationListener(this);

        add.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                validator.validate();
            }
        });
    }

    public void addNumbers() {
        int num1 = Integer.parseInt(number1.getText().toString());
        int num2 = Integer.parseInt(number2.getText().toString());
        int sum = num1 + num2;
        result.setText("Sum :" + sum);
        Toast.makeText(MainActivity.this, "Sum :" + sum, Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onValidationSucceeded() {
        addNumbers();
    }

    @Override
    public void onValidationFailed(List<ValidationError> errors) {
        for (ValidationError error : errors) {
            View view = error.getView();
            String message = error.getCollatedErrorMessage(this);

            // Display error messages ;)
            if (view instanceof EditText) {
                ((EditText) view).setError(message);
            } else {
                Toast.makeText(this, message, Toast.LENGTH_LONG).show();
            }
        }
    }

}

package com.ebhor.addition;

import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;

import com.mobsandgeeks.saripaar.ValidationError;

import com.mobsandgeeks.saripaar.Validator;

import com.mobsandgeeks.saripaar.annotation.NotEmpty;

import java.util.List;

public class MainActivity extends Activity implements Validator.ValidationListener {

@NotEmpty(message = "Please Enter number1")

EditText number1;

@NotEmpty(message = "Please Enter number2")

EditText number2;

TextView result;

Validator validator;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

number1 = (EditText) findViewById(R.id.editTextNumber);

number2 = (EditText) findViewById(R.id.editTextNumber2);

result = (TextView) findViewById(R.id.textView2);

Button add = (Button) findViewById(R.id.button);

validator = new Validator(this);

validator.setValidationListener(this);

add.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

validator.validate();

}

});

}

public void addNumbers() {

int num1 = Integer.parseInt(number1.getText().toString());

int num2 = Integer.parseInt(number2.getText().toString());

int sum = num1 + num2;

result.setText("Sum :" + sum);

Toast.makeText(MainActivity.this, "Sum :" + sum, Toast.LENGTH_SHORT).show();

}

@Override

public void onValidationSucceeded() {

addNumbers();

}

@Override

public void onValidationFailed(List<ValidationError> errors) {

for (ValidationError error : errors) {

View view = error.getView();

String message = error.getCollatedErrorMessage(this);

// Display error messages ;)

if (view instanceof EditText) {

((EditText) view).setError(message);

} else {

Toast.makeText(this, message, Toast.LENGTH_LONG).show();

}

Hope you … Read more