Android Tutorial

This is a simple calculator with basic mathematical operations. You can download full source code of this project from Github https://github.com/arunkfedex/SimpleCalculator We are using ViewModel and LiveData so we need to add those dependencies in build.gradle file. build.gradle plugins { id 'com.android.application' id 'kotlin-android' } android { compileSdk 30 defaultConfig { applicationId "com.arun.androidtutsforu.simplecalculator" minSdk 21 targetSdk 30 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 ta

  You can also view this on my youtube channel How to Open Android Emulator from Commad Line 1.Open Command line 2.Change working directory to android sdk directory    cd  appdata/local/android/sdk/emulator 3.List all available Android virtual devices     emulator -list-avds 4. All your avds will be shown choose the avd_name you want to open    emulator -avd avd_name   5.Your Android virtual device will open up How to install APk file to emulator Drag the APK to Android emulator it will install automatically

ViewBinding is a feature that allow you to write code more easily.  First we will s ee an App without ViewBinding then we will enable ViewBinding in the App .Screenshot of our app is , it is asimple application when we  click the Button score Will Increase You can also see this tutorial in my youtube channel you can download source code of this project from GitHub https://github.com/arunkfedex/DemoNavGraphTest Layout file is 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/text1

  Navigation is the way user navigate between different fragments and activities . New navigation component helps us  visualize all the navigation in our application in a single navigation graph . Navigation graph is xml resource which contains all navigation related information in one centralized location. This include all individual content area(fragments) which are called destinations  and paths user can take in the applicatio known as actions. Navigation graph of our sample application is screenshots of our sample application implementing android navigation  Full source code of the sample application can be downloaded from the following github link https://github.com/arunkfedex/demoNavigation In this application we use navigation component to implement overflow menu and Navigation drawer. We also use Safe Args for sending data between fragments. 1.First we need to add following dependencies    For Navigati