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How to make age Calculator app in Android Studio

June 27, 2023 by Admin

Create a new project in Android Studio and name it “AgeCalculatorApp”. Open the activity_main.xml file located in the res/layout directory. Replace the existing code with the following XML layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/label_birthdate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Enter your birthdate:"
        android:textSize="18sp"
        android:textStyle="bold"
        android:layout_marginBottom="16dp" />

    <EditText
        android:id="@+id/edit_birthdate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="date"
        android:layout_marginBottom="16dp" />

    <Button
        android:id="@+id/button_calculate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Calculate"
        android:onClick="calculateAge"
        android:layout_marginBottom="16dp" />

    <TextView
        android:id="@+id/text_result"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:layout_marginBottom="16dp" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

android:gravity="center"

tools:context=".MainActivity">

<TextView

android:id="@+id/label_birthdate"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Enter your birthdate:"

android:textSize="18sp"

android:textStyle="bold"

android:layout_marginBottom="16dp" />

<EditText

android:id="@+id/edit_birthdate"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:inputType="date"

android:layout_marginBottom="16dp" />

<Button

android:id="@+id/button_calculate"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Calculate"

android:onClick="calculateAge"

android:layout_marginBottom="16dp" />

<TextView

android:id="@+id/text_result"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textSize="18sp"

android:layout_marginBottom="16dp" />

</LinearLayout>

Open the MainActivity.java file located in the java/<your_package_name> directory. Replace the existing code with the following Java code:

package com.example.agecalculatorapp;

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

import androidx.appcompat.app.AppCompatActivity;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

public class MainActivity extends AppCompatActivity {

    private EditText editBirthdate;
    private TextView textResult;

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

        editBirthdate = findViewById(R.id.edit_birthdate);
        textResult = findViewById(R.id.text_result);
    }

    public void calculateAge(View view) {
        String birthdateString = editBirthdate.getText().toString();

        SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy", Locale.getDefault());
        Date currentDate = new Date();

        try {
            Date birthdate = dateFormat.parse(birthdateString);
            long ageInMillis = currentDate.getTime() - birthdate.getTime();

            // Calculate age in years
            long ageInYears = ageInMillis / (1000L * 60L * 60L * 24L * 365L);

            // Calculate age in months
            long ageInMonths = ageInYears * 12;

            // Calculate age in days
            long ageInDays = ageInMillis / (1000L * 60L * 60L * 24L);

            String result = String.format("Age: %d years, %d months, %d days", ageInYears, ageInMonths, ageInDays);
            textResult.setText(result);
        } catch (ParseException e) {
            e.printStackTrace();
            textResult.setText("Invalid date format");
        }
    }
}

package com.example.agecalculatorapp;

import android.os.Bundle;

import android.view.View;

import android.widget.EditText;

import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Locale;

public class MainActivity extends AppCompatActivity {

private EditText editBirthdate;

private TextView textResult;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

editBirthdate = findViewById(R.id.edit_birthdate);

textResult = findViewById(R.id.text_result);

}

public void calculateAge(View view) {

String birthdateString = editBirthdate.getText().toString();

SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy", Locale.getDefault());

Date currentDate = new Date();

try {

Date birthdate = dateFormat.parse(birthdateString);

long ageInMillis = currentDate.getTime() - birthdate.getTime();

// Calculate age in years

long ageInYears = ageInMillis / (1000L * 60L * 60L * 24L * 365L);

// Calculate age in months

long ageInMonths = ageInYears * 12;

// Calculate age in days

long ageInDays = ageInMillis / (1000L * 60L * 60L * 24L);

String result = String.format("Age: %d years, %d months, %d days", ageInYears, ageInMonths, ageInDays);

textResult.setText(result);

} catch (ParseException e) {

e.printStackTrace();

textResult.setText("Invalid date format");

}

Open the AndroidManifest.xml file located … Read more

How to make Tic Tac Toe game App in Android Studio

June 27, 2023 by Admin

Here are Tic Tac Toe game android App code below Create a new project in Android Studio and name it “TicTacToeApp”. Open the activity_main.xml file located in the res/layout directory. Replace the existing code with the following XML layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="16dp">

        <GridLayout
            android:id="@+id/gridLayout"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:columnCount="3"
            android:rowCount="3"
            android:useDefaultMargins="true">

            <Button
                android:id="@+id/button1"
                style="@style/BoardButton"
                android:onClick="onBoardButtonClick" />

            <Button
                android:id="@+id/button2"
                style="@style/BoardButton"
                android:onClick="onBoardButtonClick" />

            <Button
                android:id="@+id/button3"
                style="@style/BoardButton"
                android:onClick="onBoardButtonClick" />

            <Button
                android:id="@+id/button4"
                style="@style/BoardButton"
                android:onClick="onBoardButtonClick" />

            <Button
                android:id="@+id/button5"
                style="@style/BoardButton"
                android:onClick="onBoardButtonClick" />

            <Button
                android:id="@+id/button6"
                style="@style/BoardButton"
                android:onClick="onBoardButtonClick" />

            <Button
                android:id="@+id/button7"
                style="@style/BoardButton"
                android:onClick="onBoardButtonClick" />

            <Button
                android:id="@+id/button8"
                style="@style/BoardButton"
                android:onClick="onBoardButtonClick" />

            <Button
                android:id="@+id/button9"
                style="@style/BoardButton"
                android:onClick="onBoardButtonClick" />

        </GridLayout>

        <Button
            android:id="@+id/resetButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="16dp"
            android:text="Reset"
            android:onClick="resetGame" />

        <TextView
            android:id="@+id/statusTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="16dp"
            android:textSize="18sp"
            android:textStyle="bold" />

    </LinearLayout>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

android:gravity="center"

tools:context=".MainActivity">

<LinearLayout

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:orientation="vertical"

android:padding="16dp">

<GridLayout

android:id="@+id/gridLayout"

android:layout_width="match_parent"

android:layout_height="0dp"

android:layout_weight="1"

android:columnCount="3"

android:rowCount="3"

android:useDefaultMargins="true">

<Button

android:id="@+id/button1"

style="@style/BoardButton"