Mobile App Dev 2022W: Tutorial 7 - Revision history

Soma: /* Background */

2022-03-09T15:49:24Z

Background

← Older revision		Revision as of 15:49, 9 March 2022
Line 4:		Line 4:

	Relevant documentation:		Relevant documentation:
			* [https://developer.android.com/guide/components/activities/intro-activities Android activities]
	* [https://developer.android.com/guide/components/activities/activity-lifecycle Android activity lifecycle]		* [https://developer.android.com/guide/components/activities/activity-lifecycle Android activity lifecycle]
	*

	==Questions==		==Questions==

Soma at 15:45, 9 March 2022

2022-03-09T15:45:07Z

← Older revision		Revision as of 15:45, 9 March 2022
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	# Change textanalyzer-5 so that when rotated it preserves the current analysis mode.		# Change textanalyzer-5 so that when rotated it preserves the current analysis mode.

	==TapDemo Code		==TapDemo Code==

	===MainActivity.kt===		===MainActivity.kt===

Soma: /* Background */

2022-03-09T15:44:52Z

Background

← Older revision		Revision as of 15:44, 9 March 2022
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	==Background==		==Background==

			To preserve battery life, the activities of Android apps are often paused or even terminated automatically. To preserve the user experience, apps are notified before various state change events, allowing them to take steps to preserve state so that when they resume the user doesn't even know that they were terminated. Here we explore Android activity lifecycle events and how to respond to them.

			Relevant documentation:
			* [https://developer.android.com/guide/components/activities/activity-lifecycle Android activity lifecycle]
			*

	==Questions==		==Questions==

Soma at 15:40, 9 March 2022

2022-03-09T15:40:00Z

← Older revision		Revision as of 15:40, 9 March 2022
Line 26:		Line 26:
	# Change textanalyzer-5 so that when rotated it preserves the current analysis mode.		# Change textanalyzer-5 so that when rotated it preserves the current analysis mode.

	===~~TapDemo~~ MainActivity.kt===		==TapDemo Code

			===MainActivity.kt===

	[https://homeostasis.scs.carleton.ca/~soma/mad-2022w/code/TapDemo/MainActivity.kt MainActivity.kt source]		[https://homeostasis.scs.carleton.ca/~soma/mad-2022w/code/TapDemo/MainActivity.kt MainActivity.kt source]
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	</syntaxhighlight>		</syntaxhighlight>

	===~~TapDemo~~ activity_main.xml===		===activity_main.xml===

	[https://homeostasis.scs.carleton.ca/~soma/mad-2022w/code/TapDemo/activity_main.xml activity_main.xml source]		[https://homeostasis.scs.carleton.ca/~soma/mad-2022w/code/TapDemo/activity_main.xml activity_main.xml source]

Soma at 15:39, 9 March 2022

2022-03-09T15:39:32Z

@@ Line 1: / Line 1: @@
-===MainActivity.kt===
+==Background==
 [https://homeostasis.scs.carleton.ca/~soma/mad-2022w/code/TapDemo/MainActivity.kt MainActivity.kt source]
@@ Line 82: / Line 109: @@
 </syntaxhighlight>
-===activity_main.xml===
+===TapDemo activity_main.xml===
 [https://homeostasis.scs.carleton.ca/~soma/mad-2022w/code/TapDemo/activity_main.xml activity_main.xml source]

Soma: /* MainActivity.kt */

2022-03-09T15:31:38Z

MainActivity.kt

← Older revision		Revision as of 15:31, 9 March 2022
Line 1:		Line 1:
	===MainActivity.kt===		===MainActivity.kt===

	[https://homeostasis.scs.carleton.ca/~soma/mad-2022w/code/TapDemo/MainActivity.kt ~~MainAcitivyt~~.kt source]		[https://homeostasis.scs.carleton.ca/~soma/mad-2022w/code/TapDemo/MainActivity.kt MainActivity.kt source]

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

Soma at 15:31, 9 March 2022

2022-03-09T15:31:16Z

← Older revision		Revision as of 15:31, 9 March 2022
Line 1:		Line 1:
	===MainActivity.kt===		===MainActivity.kt===

			[https://homeostasis.scs.carleton.ca/~soma/mad-2022w/code/TapDemo/MainActivity.kt MainAcitivyt.kt source]

	<syntaxhighlight lang="kotlin" line>		<syntaxhighlight lang="kotlin" line>
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	===activity_main.xml===		===activity_main.xml===

			[https://homeostasis.scs.carleton.ca/~soma/mad-2022w/code/TapDemo/activity_main.xml activity_main.xml source]

	<syntaxhighlight lang="xml" line>		<syntaxhighlight lang="xml" line>

Soma: Created page with "===MainActivity.kt=== package carleton.comp1601.tapdemo import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.os.PersistableBundle import android.util.Log import android.view.View import android.widget.TextView class MainActivity : AppCompatActivity() { private lateinit var myMessage: TextView private var count = 0 override fun onCreate(savedInstanceState: Bundle?) { super.onCr..."

2022-03-09T15:28:32Z

Created page with "===MainActivity.kt=== <syntaxhighlight lang="kotlin" line> package carleton.comp1601.tapdemo import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.os.PersistableBundle import android.util.Log import android.view.View import android.widget.TextView class MainActivity : AppCompatActivity() { private lateinit var myMessage: TextView private var count = 0 override fun onCreate(savedInstanceState: Bundle?) { super.onCr..."

New page

===MainActivity.kt===

<syntaxhighlight lang="kotlin" line>
package carleton.comp1601.tapdemo

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.os.PersistableBundle
import android.util.Log
import android.view.View
import android.widget.TextView

class MainActivity : AppCompatActivity() {
private lateinit var myMessage: TextView
private var count = 0

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)

Log.d("TapDemo", "Created")

myMessage = findViewById(R.id.myMessage)

if (savedInstanceState != null) {
with(savedInstanceState) {
count = getInt("count")
}
} else {
count = 0
}
}

fun myButtonPressed(v: View) {
count++
myMessage.text = "You clicked $count times."

Log.d("TapDemo", "Button Pressed")
}

override fun onSaveInstanceState(outState: Bundle) {
outState.run {
putInt("count", count)
}
super.onSaveInstanceState(outState)

Log.d("TapDemo", "State saved")
}

override fun onDestroy() {
super.onDestroy()
Log.d("TapDemo", "Destroyed")
}

override fun onResume() {
super.onResume()
Log.d("TapDemo", "Resumed")
}

override fun onPause() {
super.onPause()
Log.d("TapDemo", "Paused")
}

override fun onStart() {
super.onStart()
Log.d("TapDemo", "Started")
}

override fun onStop() {
super.onStop()
Log.d("TapDemo", "Stopped")
}

override fun onRestart() {
super.onRestart()
Log.d("TapDemo", "Restarted")
}
}
</syntaxhighlight>

===activity_main.xml===

<syntaxhighlight lang="xml" line>
<?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:id="@+id/TapDemo"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<Button
android:id="@+id/myButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="myButtonPressed"
android:text="Tap me!"
android:textAppearance="@style/TextAppearance.AppCompat.Display1"
app:layout_constraintBottom_toTopOf="@+id/myMessage"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />

<TextView
android:id="@+id/myMessage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="You haven't tapped yet."
android:textAppearance="@style/TextAppearance.AppCompat.Display1"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</syntaxhighlight>