Mobile App Development 2021W Lecture 16 - Revision history

Soma: /* Code */

2021-03-15T23:52:55Z

Code

← Older revision		Revision as of 23:52, 15 March 2021
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	==Code==		==Code==

			The Mar10 Android code below is a modified version of the code from [[Mobile App Development 2021W Lecture 15\|Lecture 15]].

			To create the iOS TapDemo, just make a new SwiftUI project and replace ContentView.swift with the code below.

	===TapDemo (iOS) ContentView.swift===		===TapDemo (iOS) ContentView.swift===
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	</syntaxhighlight>		</syntaxhighlight>

	===~~TapDemo~~ (Android) MainActivity.kt===		===Mar10 (Android) MainActivity.kt===

	<syntaxhighlight lang="kotlin" line>		<syntaxhighlight lang="kotlin" line>
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	</syntaxhighlight>		</syntaxhighlight>

	===~~TapDemo~~ (Android) activity_main.xml===		===Mar10 (Android) activity_main.xml===

	<syntaxhighlight lang="kotlin" line>		<syntaxhighlight lang="kotlin" line>

Soma: /* TapDemo (Android) activity_main.xml */

2021-03-15T23:49:58Z

TapDemo (Android) activity_main.xml

← Older revision		Revision as of 23:49, 15 March 2021
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	xmlns:app="http://schemas.android.com/apk/res-auto"		xmlns:app="http://schemas.android.com/apk/res-auto"
	xmlns:tools="http://schemas.android.com/tools"		xmlns:tools="http://schemas.android.com/tools"
	android:id="@+id/~~TapDemo~~"		android:id="@+id/Mar10"
	android:layout_width="match_parent"		android:layout_width="match_parent"
	android:layout_height="match_parent"		android:layout_height="match_parent"

Soma: /* TapDemo (Android) MainActivity.kt */

2021-03-15T23:49:11Z

TapDemo (Android) MainActivity.kt

← Older revision		Revision as of 23:49, 15 March 2021
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	<syntaxhighlight lang="kotlin" line>		<syntaxhighlight lang="kotlin" line>
	package carleton.comp1601.~~tapdemo~~		package carleton.comp1601.mar10

	import androidx.appcompat.app.AppCompatActivity		import androidx.appcompat.app.AppCompatActivity

Soma at 19:12, 15 March 2021

2021-03-15T19:12:57Z

← Older revision		Revision as of 19:12, 15 March 2021
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	Video from the lecture given on March 15, 2021 [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/lectures/comp1601-2021w-lec16-20210315.m4v is now available].		Video from the lecture given on March 15, 2021 [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/lectures/comp1601-2021w-lec16-20210315.m4v is now available].

	~~==Code==~~

	==Notes==		==Notes==
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	Note that in SwiftUI, this sort of state management is taken care of for us!		Note that in SwiftUI, this sort of state management is taken care of for us!
	</pre>		</pre>

			==Code==

	===TapDemo (iOS) ContentView.swift===		===TapDemo (iOS) ContentView.swift===

Soma at 19:12, 15 March 2021

2021-03-15T19:12:29Z

← Older revision		Revision as of 19:12, 15 March 2021
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	==Code==		==Code==

			==Notes==

			<pre>
			Lecture 16
			----------
			Plan
			- Midterm
			- review solutions, class performance
			- interviews
			- upcoming tutorials and assignments
			- state in iOS and Android


			Midterm average: 21.7 (67.83%)
			Q1a 91.30%
			Q1b 50.00%
			Q1c 35.56%
			Q1d 84.78%
			Q1e 79.35%
			Q1f 86.96%
			Q1g 88.04%

			Q2 83.70%

			Q3 55.98%

			Q4 27.17%

			Q5a 91.30%
			Q5b 85.87%
			Q5c 73.33%
			Q5d 64.67%

			Q6a 89.13%
			Q6b 73.91%
			Q6c 92.39%
			Q6d 94.77%

			Q7a 80.00%
			Q7b 65.56%
			Q7c 76.11%
			Q7d 68.48%

			For interviews
			- I have some volunteers already (PM me if you wish to volunteer)
			- will randomly (and deliberately) select more

			Interviews will be this week and next week
			- I'm going to put up a spreadsheet after class
			- add your name to the schedule where you want to talk
			- I will PM you if I want to interview you and you didn't volunteer
			- I'll open up times as necessary

			Final exam
			- same format, just longer (2 hour exam)
			- will cover material from entire semester (so will include midterm
			material)
			- will have interviews after

			Interviews are just 10 min discussing questions
			- ask about ones you got wrong
			- ones you got right
			- I want to understand your thinking, help you better understand
			the underlying concepts

			If you do better on the final than the midterm, the final replaces the midterm
			- that's why it is cumulative


			State in iOS and Android

			in Android, activities have a "lifecycle"
			- created, destroyed, paused, stopped, resumed
			- https://developer.android.com/guide/components/activities/activity-lifecycle

			Activities, once created, won't stay created
			- they can get messed with at arbitrary times

			Mobile devices are constrained in CPU, memory, and battery
			- so OS must constantly manage resources
			- this means apps have to deal with their resources getting reclaimed at
			any time
			- also, in Android UI changes (like rotating the screen) are treated as
			a "restart" (i.e., kill the screen and start it again so it can use
			the new screen geometry)
			- so, your app has to manage state so it doesn't go back to zero

			Note that in SwiftUI, this sort of state management is taken care of for us!
			</pre>

	===TapDemo (iOS) ContentView.swift===		===TapDemo (iOS) ContentView.swift===

Soma: /* Code */

2021-03-15T19:11:07Z

Code

@@ Line 5: / Line 5: @@
 ==Code==
-===TapDemo/Shared/ContentView.swift===
+===TapDemo (iOS) ContentView.swift===
 <syntaxhighlight lang="swift" line>
@@ Line 38: / Line 38: @@
+     }
+}
 </syntaxhighlight>

Soma at 19:02, 15 March 2021

2021-03-15T19:02:26Z

← Older revision		Revision as of 19:02, 15 March 2021
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			==Video==

			Video from the lecture given on March 15, 2021 [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/lectures/comp1601-2021w-lec16-20210315.m4v is now available].

	==Code==		==Code==

Soma at 17:27, 15 March 2021

2021-03-15T17:27:22Z

← Older revision		Revision as of 17:27, 15 March 2021
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	==~~iOS TapDemo~~==		==Code==

	===ContentView.swift===		===TapDemo/Shared/ContentView.swift===

	<syntaxhighlight lang="swift" line>		<syntaxhighlight lang="swift" line>

Soma: Created page with "==iOS TapDemo== ===ContentView.swift=== // // ContentView.swift // Shared // // Created by Anil Somayaji on 2021-03-15. // import Swi..."

2021-03-15T17:26:50Z

Created page with "==iOS TapDemo== ===ContentView.swift=== <syntaxhighlight lang="swift" line> // // ContentView.swift // Shared // // Created by Anil Somayaji on 2021-03-15. // import Swi..."

New page

==iOS TapDemo==

===ContentView.swift===

<syntaxhighlight lang="swift" line>
//
// ContentView.swift
// Shared
//
// Created by Anil Somayaji on 2021-03-15.
//

import SwiftUI

struct ContentView: View {
@State var count = 0
var body: some View {
VStack{
Button("Tap here!", action: onTapped)
.font(/*@START_MENU_TOKEN@*/.title/*@END_MENU_TOKEN@*/)

Text("You have tapped \(count) times.")
.padding()
}
}
func onTapped() {
count = count + 1
}
}

struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
</syntaxhighlight>