Mobile App Development 2021W Lecture 18 - Revision history

Soma: /* activity_main.xml */

2021-03-22T20:02:32Z

activity_main.xml

← Older revision		Revision as of 20:02, 22 March 2021
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	</androidx.constraintlayout.widget.ConstraintLayout>		</androidx.constraintlayout.widget.ConstraintLayout>
	<syntaxhighlight>		</syntaxhighlight>

Soma: /* Code */

2021-03-22T20:02:20Z

Code

← Older revision		Revision as of 20:02, 22 March 2021
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	}		}
	}		}
	<syntaxhighlight>		</syntaxhighlight>

	===activity_main.xml===		===activity_main.xml===

Soma at 20:01, 22 March 2021

2021-03-22T20:01:54Z

← Older revision		Revision as of 20:01, 22 March 2021
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	<syntaxhighlight lang="kotlin" line>		<syntaxhighlight lang="kotlin" line>

	package carleton.comp1601.mar22		package carleton.comp1601.mar22

Soma at 19:50, 22 March 2021

2021-03-22T19:50:12Z

← Older revision		Revision as of 19:50, 22 March 2021
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	<syntaxhighlight>		<syntaxhighlight>

	==activity_main.xml==		===activity_main.xml===

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

Soma: /* MainActivity.kt */

2021-03-22T19:49:43Z

MainActivity.kt

← Older revision		Revision as of 19:49, 22 March 2021
Line 5:		Line 5:
	==Code==		==Code==

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

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

Soma at 19:49, 22 March 2021

2021-03-22T19:49:32Z

← Older revision		Revision as of 19:49, 22 March 2021
Line 2:		Line 2:

	Video from the lecture given on March 22, 2021 [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/lectures/comp1601-2021w-lec18-20210322.m4v is now available].		Video from the lecture given on March 22, 2021 [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/lectures/comp1601-2021w-lec18-20210322.m4v is now available].

			==Code==

			==MainActivity.kt==

			<syntaxhighlight lang="kotlin" line>
			package carleton.comp1601.mar22

			import androidx.appcompat.app.AppCompatActivity
			import android.os.Bundle
			import android.text.Editable
			import android.text.TextWatcher
			import android.widget.EditText
			import android.widget.ImageView

			class MainActivity : AppCompatActivity() {
			private lateinit var p: ImageView
			private var r = 0F
			private var scale = 1F
			private lateinit var rotationInput: EditText
			private lateinit var scaleInput: EditText

			override fun onCreate(savedInstanceState: Bundle?) {
			super.onCreate(savedInstanceState)
			setContentView(R.layout.activity_main)
			if (savedInstanceState != null) {
			// do something
			}

			p = findViewById(R.id.mypic)
			rotationInput = findViewById(R.id.rotation)
			scaleInput = findViewById(R.id.scale)

			p.setImageResource(R.drawable.roshi)
			rotationInput.addTextChangedListener(rotationWatcher)
			scaleInput.addTextChangedListener(scaleWatcher)
			updateImage()
			}

			fun updateImage() {
			p.setX(0F)
			p.setY(0F)
			p.setRotation(r)
			p.setScaleX(scale)
			p.setScaleY(scale)
			}

			private val rotationWatcher = object : TextWatcher {
			override fun afterTextChanged(s: Editable) {
			val new_rS = rotationInput.getText().toString()
			val new_r = new_rS.toFloatOrNull()

			if (new_r != null) {
			r = new_r
			updateImage()
			}
			}

			override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
			}

			override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
			}
			}
			private val scaleWatcher = object : TextWatcher {
			override fun afterTextChanged(s: Editable) {
			val new_scaleS = rotationInput.getText().toString()
			val new_scale = new_scaleS.toFloatOrNull()

			if (new_scale != null) {
			if (new_scale > 1.5F) {
			scale = 1.5F
			} else {
			scale = new_scale
			}
			updateImage()
			}
			}

			override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
			}

			override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
			}
			}
			}
			<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:layout_width="match_parent"
			android:layout_height="match_parent"
			tools:context=".MainActivity">

			<LinearLayout
			android:layout_width="match_parent"
			android:layout_height="match_parent"
			android:orientation="vertical">

			<EditText
			android:id="@+id/rotation"
			android:layout_width="match_parent"
			android:layout_height="wrap_content"
			android:ems="10"
			android:inputType="numberDecimal" />

			<EditText
			android:id="@+id/scale"
			android:layout_width="match_parent"
			android:layout_height="wrap_content"
			android:ems="10"
			android:inputType="numberDecimal" />

			<ImageView
			android:id="@+id/mypic"
			android:layout_width="match_parent"
			android:layout_height="wrap_content"
			app:srcCompat="@drawable/kittens" />
			</LinearLayout>

			</androidx.constraintlayout.widget.ConstraintLayout>
			<syntaxhighlight>

Soma: Created page with "==Video== Video from the lecture given on March 22, 2021 [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/lectures/comp1601-2021w-lec18-20210322.m4v is now available]."

2021-03-22T19:28:01Z

Created page with "==Video== Video from the lecture given on March 22, 2021 [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/lectures/comp1601-2021w-lec18-20210322.m4v is now available]."

New page

==Video==

Video from the lecture given on March 22, 2021 [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/lectures/comp1601-2021w-lec18-20210322.m4v is now available].