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Android Architechture

on February 05, 2021

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Code Sample - Android Architecture Blueprints
Code Sample - Blueprint Architecture Samples at a Glance Comparison
Talk - Android Jetpack: what's new in Architecture Components (Google I/O '18)
Talk - Droidcon NYC 2016 - A Journey Through MV Wonderland
Blog Post - Android Architecture Patterns Part 2: Model-View-Presenter
Documentation - Guide to App Architecture
Blog Post - Android and Architecture

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Encapsulation

1. Make internal and external versions of word and score : Open up GameViewModel. The internal version should be a MutableLiveData, have an underscore in front of its name, and be private. The underscore is our convention for marking the variable as the internal version of a variable. The external version should be a LiveData and not have an underscore in front of its name. For example, here’s the internal and external version of score : // internal private val _score = MutableLiveData< Int >() //external val score: LiveData< Int > 2. Make a backing property for the external version that returns the internal MutableLiveData as a LiveData: Kotlin automatically makes getters and setters for your fields . If you want to override the getter for score , you can do so using a backing property . You've actually already defined your backing properties ( _score and _word ). Now you can take your public versions...

Dependencies

apply plugin : 'com.android.application' apply plugin : 'kotlin-android' apply plugin : "androidx.navigation.safeargs.kotlin" apply plugin : 'kotlin-kapt' apply plugin : 'dagger.hilt.android.plugin' android { compileSdkVersion 33 buildToolsVersion "30.0.3" defaultConfig { applicationId "com.homegym" minSdkVersion 23 targetSdkVersion 33 versionCode 2 versionName "1.1" } packagingOptions { exclude 'META-INF/DEPENDENCIES' exclude 'META-INF/LICENSE' exclude 'META-INF/LICENSE.txt' exclude 'META-INF/license.txt' exclude 'META-INF/NOTICE' exclude 'META-INF/NOTICE.txt' exclude 'META-INF/notice.txt' exclude 'META-INF/ASL2.0' exclude 'META-INF/AL2.0' exclude 'META-INF/LGPL2.1' } compileOptions { ...

Is Strings Isomorphic - Question

Given two strings s and t , determine if they are isomorphic . Two strings s and t are isomorphic if the characters in s can be replaced to get t . All occurrences of a character must be replaced with another character while preserving the order of characters. No two characters may map to the same character, but a character may map to itself. Example 1: Input: s = "egg", t = "add" Output: true Explanation: The strings s and t can be made identical by: Mapping 'e' to 'a' . Mapping 'g' to 'd' . Example 2: Input: s = "foo", t = "bar" Output: false Explanation: The strings s and t can not be made identical as 'o' needs to be mapped to both 'a' and 'r' . Example 3: Input: s = "paper", t = "title" Output: true Constraints: 1 <= s.length <= 5 * ...

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