Android Tutorial

  Jetpack Compose is a modern declarative UI Toolkit . In jetpack's declarative approach widgets are stateless and does not expose getter or setter function . So we cannot update UI with button.setText(String) or img.setImageBitmap()....  In Compose we build UI by defining set of Composable function. Composable function take in data and emit UI elements. So in Compose  only way to  update the UI is by calling the same Composable function with new Arguments. This Argument represents UI State. State in an app is any value that changes over time , this includes simple class variable to Room Database.  Any time a State is updated we need to call the Composable with new State to update the UI. This is called ReComposition .  This Demo Jetpack Compose app will help you understand the basics of Jetpack Compose. Screenshots of this App   This is our MainActivity package com.arun.androidtutsforu.democompose import android.os.Bundle import androidx.activit...

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...

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...

This is demo application implementing Google Sign-in in android application. Screenshots of the application are when you click on the sign in button popup will be shown to select google account for sign in . After signing in , user can see his profile photo,name and Email id in the login screen . User can sign out using signout button . Disconnect button will provide user ability to disconnect their google account from the app. Before we start coding for our application , we need to turn on sign-in API for our app in google developer console. Go to this link to know  how to turn on google sign-in api for our app https://androidtuts4u.blogspot.com/2019/09/enabling-sign-in-api-in-google.html now we successfully configured Google Api console project .  we can start coding our application. I . first we need to configure build.gradle file we need to add two dependencies   1. google play service dependency for google sign-in.    2 ....

We need to enable Sign-in Api for our application in google developers console to use google sign-in  in our application. 1 . first we need to create a project in google developers console     visit google developers  console        https://console.developers.google.com/project 2 .  Click on create project button you will see the below screen     3 .  Enter project name and click CREATE . Then we are directed to project home page  which will look like this 4 .  Next we need to add Google API to our project. click on library on left menu and search for google api 5 .  Configure  OAuth consent screen , click on 'OAuth consent screen '  6  .  Enter Application name and email id everything else is optional  and click save   7  . Configure Credentials        Google uses this to ensure that your application is not fake applicatio...