add android App Age-Calculator with Readme.md file

Age-Calculator/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

Age-Calculator/README.md

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+# Age Calculator - [DOWNLOAD APP](https://www.mediafire.com/file/bwgnagn8uydgvij/app-debug.apk/file?dkey=bwgnagn8uydgvij)
+<img src ="https://user-images.githubusercontent.com/85965606/174242767-66902015-e73f-4d3c-8dc3-eabeede0df78.png" width="600" heigth="600">
+
+## Calculate Age in Detailed view
+
+Age-Calculator is a kotlin based android application
+
+## Some Screenshots of Applicaiton
+
+.<img src= "https://user-images.githubusercontent.com/85965606/174243277-02a4d031-8c96-4a7b-9787-031444a2cfd7.jpeg" width="250" height="500">
+.<img src ="https://user-images.githubusercontent.com/85965606/174243288-be21e4ca-657a-4aff-a19c-140db813cf75.jpeg" width="250" height="500">
+.<img src="https://user-images.githubusercontent.com/85965606/174243315-6876b8c6-4a9f-4c25-b0f4-a8d8e76215dc.jpeg" width="250" height="500">
+
+
+## Tech
+
+- Kotlin language
+- xml language
+- Android Studio
+
+And of course Age-Calculator itself is open source with a [public repository](https://github.com/Suryansh1720001/Age-Calculator)
+ on GitHub.
+
+## Installation
+... (GooglePlay Store link available soon) ...
+
+- Use this link to download the app  
+- [DOWNLOAD APP](https://www.mediafire.com/file/bwgnagn8uydgvij/app-debug.apk/file?dkey=bwgnagn8uydgvij)
+
+## Attributes
+
+Thank you for providing me images from your sources 
+
+- <a href='https://www.freepik.com/vectors/office-hours'>Office hours vector created by pch.vector - www.freepik.com</a>
+- <a href='https://www.freepik.com/vectors/different-ages'>Different ages vector created by pch.vector - www.freepik.com</a>
+
+
+

Age-Calculator/app/.gitignore

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+/build

Age-Calculator/app/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'org.jetbrains.kotlin.android'
+}
+
+android {
+    compileSdk 32
+
+    defaultConfig {
+        applicationId "com.google.suryansh7202.dobcalc"
+        minSdk 21
+        targetSdk 32
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.core:core-ktx:1.7.0'
+    implementation 'androidx.appcompat:appcompat:1.4.2'
+    implementation 'com.google.android.material:material:1.6.1'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+}

Age-Calculator/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

Age-Calculator/app/src/androidTest/java/com/google/suryansh7202/dobcalc/ExampleInstrumentedTest.kt

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+package com.google.suryansh7202.dobcalc
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.google.suryansh7202.dobcalc", appContext.packageName)
+    }
+}

Age-Calculator/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="com.google.suryansh7202.dobcalc">
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.DOBCals"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

Age-Calculator/app/src/main/java/com/google/suryansh7202/dobcalc/MainActivity.kt

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+package com.google.suryansh7202.dobcalc
+
+import android.app.DatePickerDialog
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.widget.Button
+import android.widget.TextView
+import java.text.SimpleDateFormat
+import java.util.*
+
+class MainActivity : AppCompatActivity() {
+    private var tvSelectedDate: TextView? = null
+    private var tvAgeinHours : TextView? = null
+    private var tvAgeinMinutes : TextView? = null
+    private var tvAgeinSeconds : TextView? = null
+    private var tvAgeinDays : TextView? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+
+
+        val btnDatePicker: Button = findViewById(R.id.btnDatePicker)
+        tvSelectedDate = findViewById(R.id.tvSelectedDate)
+        tvAgeinHours = findViewById(R.id.tvAgeInHours)
+        tvAgeinMinutes =findViewById(R.id.tvAgeInMinutes)
+        tvAgeinSeconds = findViewById(R.id.tvAgeInSeconds)
+        tvAgeinDays = findViewById(R.id.tvAgeInDays)
+
+        // current date show on selected date
+        val sdf = SimpleDateFormat("dd/MM/yyyy",Locale.ENGLISH)
+        val currentDate = sdf.parse(sdf.format(System.currentTimeMillis()))
+        currentDate?.let {
+            tvSelectedDate?.text = currentDate.toString()
+        }
+        btnDatePicker.setOnClickListener {
+            clickDatePicker()
+
+        }
+
+    }
+
+    private fun clickDatePicker(){
+        val myCalender = Calendar.getInstance()
+        val year = myCalender.get(Calendar.YEAR)
+        val month =  myCalender.get(Calendar.MONTH)
+        val day = myCalender.get(Calendar.DAY_OF_MONTH)
+
+        val dpd = DatePickerDialog(this,
+       {_,selectedyear,selectedmonth,selecteddayOfMonth ->
+
+           val selectedDate = "$selecteddayOfMonth/${selectedmonth+1}/$selectedyear"
+           tvSelectedDate?.text = selectedDate
+
+
+           val sdf = SimpleDateFormat("dd/MM/yyyy",Locale.ENGLISH)
+           val theDate = sdf.parse(selectedDate)
+           theDate?.let {
+               val selectedDateInDays = theDate.time/ 86400000
+               val selectedDateInMinutes = theDate.time/ 60000
+               val selectedDateInHours = theDate.time/ 3600000
+               val selectedDateInSeconds = theDate.time/ 1000
+
+
+
+               val currentDate = sdf.parse(sdf.format(System.currentTimeMillis()))
+               currentDate?.let {
+                   val currentDateInDays = currentDate.time/ 86400000
+                   val currentDateInMinutes = currentDate.time/ 60000
+                   val currentDateInHours = currentDate.time/ 3600000
+                   val currentDateInSeconds = currentDate.time/ 1000
+
+                   val differenceInDays = currentDateInDays-selectedDateInDays
+                   val differenceInMinutes = currentDateInMinutes-selectedDateInMinutes
+                   val differenceInHours = currentDateInHours-selectedDateInHours
+                   val differenceInSeconds = currentDateInSeconds-selectedDateInSeconds
+
+
+                   tvAgeinDays?.text = differenceInDays.toString()
+                   tvAgeinMinutes?.text = differenceInMinutes.toString()
+                   tvAgeinHours?.text = differenceInHours.toString()
+                   tvAgeinSeconds?.text = differenceInSeconds.toString()
+
+
+               }
+
+           }
+
+
+
+
+
+       },
+       year,
+       month,
+       day
+   )
+
+        dpd.datePicker.maxDate = System.currentTimeMillis()- 86400000
+
+        dpd.show()
+
+
+
+    }
+
+
+}