Added Lab 8

Labs/Lab8_GesturesLab/.gitignore

+# built application files
+*.apk
+*.ap_
+
+# files for the dex VM
+*.dex
+
+# Java class files
+*.class
+
+# Mac files
+.DS_Store
+
+# generated files
+bin/
+gen/
+
+# Ignore gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Eclipse prefs files
+.prefs
+
+# Android Studio
+*.iml
+.idea
+.gradle
+
+#NDK
+obj/

Labs/Lab8_GesturesLab/app/build.gradle

+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+
+android {
+    //noinspection GradleCompatible,GradleCompatible
+    compileSdkVersion 26
+    buildToolsVersion '29.0.3'
+
+    defaultConfig {
+        applicationId "course.labs.gestureslab"
+        minSdkVersion 21
+        targetSdkVersion 30
+
+        testApplicationId "course.labs.gestureslab.tests"
+        testInstrumentationRunner "android.test.InstrumentationTestRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
+        }
+    }
+}
+
+dependencies {
+    androidTestImplementation 'com.jayway.android.robotium:robotium-solo:5.6.3'
+    //noinspection GradleDependency
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+}
+repositories {
+    mavenCentral()
+}

Labs/Lab8_GesturesLab/app/src/androidTest/java/course/labs/gestureslab/test/BubbleActivityFling.kt

+package course.labs.gestureslab.test
+
+import course.labs.gestureslab.BubbleActivity
+
+import com.robotium.solo.*
+import android.test.ActivityInstrumentationTestCase2
+import android.view.WindowManager
+import junit.framework.Assert
+
+class BubbleActivityFling : ActivityInstrumentationTestCase2<BubbleActivity>(BubbleActivity::class.java) {
+    private var solo: Solo? = null
+
+    @Throws(Exception::class)
+    public override fun setUp() {
+        solo = Solo(instrumentation, activity)
+        instrumentation.runOnMainSync {
+            activity.window.addFlags(
+                    WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD)
+        }
+    }
+
+    @Throws(Exception::class)
+    public override fun tearDown() {
+        solo!!.finishOpenedActivities()
+    }
+
+    fun testRun() {
+
+        val delay = 2000
+
+        // Wait for activity: 'course.labs.TouchLab.BubbleActivity'
+        solo!!.waitForActivity(BubbleActivity::class.java,
+                delay)
+
+        solo!!.clickOnActionBarItem(course.labs.gestureslab.R.id.menu_still_mode)
+
+        solo!!.sleep(delay)
+
+        // Click to create a bubble
+        solo!!.clickOnScreen(120f, 120f)
+
+        solo!!.sleep(delay)
+
+        // Assert that a bubble was displayed
+        Assert.assertEquals(
+                "Bubble hasn't appeared",
+                1,
+                solo!!.getCurrentViews(
+                        BubbleActivity.BubbleView::class.java)
+                        .size)
+
+        // Fling the bubble
+        solo!!.drag(100f, 1000f, 100f, 1000f, 3)
+
+        // Give bubble time to leave screen
+        solo!!.sleep(delay)
+
+        // Assert that the bubble has left the screen
+        Assert.assertEquals(
+                "Bubble hasn't left the screen",
+                0,
+                solo!!.getCurrentViews(
+                        BubbleActivity.BubbleView::class.java)
+                        .size)
+    }
+}

Labs/Lab8_GesturesLab/app/src/androidTest/java/course/labs/gestureslab/test/BubbleActivityFloatOffScreen.kt

+package course.labs.gestureslab.test
+
+import course.labs.gestureslab.BubbleActivity
+
+import com.robotium.solo.*
+import android.test.ActivityInstrumentationTestCase2
+import android.view.WindowManager
+import junit.framework.Assert
+
+class BubbleActivityFloatOffScreen : ActivityInstrumentationTestCase2<BubbleActivity>(BubbleActivity::class.java) {
+    private var solo: Solo? = null
+
+    @Throws(Exception::class)
+    public override fun setUp() {
+        solo = Solo(instrumentation, activity)
+        instrumentation.runOnMainSync {
+            activity.window.addFlags(
+                    WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD)
+        }
+    }
+
+    @Throws(Exception::class)
+    public override fun tearDown() {
+        solo!!.finishOpenedActivities()
+    }
+
+    fun testRun() {
+
+        val shortDelay = 300
+        val delay = 2000
+        val delay2 = 3000
+
+        // Wait for activity: 'course.labs.TouchLab.BubbleActivity'
+        solo!!.waitForActivity(BubbleActivity::class.java,
+                delay)
+
+        // Click on action bar item
+        solo!!.clickOnActionBarItem(course.labs.gestureslab.R.id.menu_single_speed)
+
+        solo!!.sleep(delay)
+
+        // Click to create a bubble
+        solo!!.clickOnScreen(350.0f, 350.0f)
+
+        // Check whether bubble appears
+        var bubbleAppeared = solo!!.getCurrentViews(
+                BubbleActivity.BubbleView::class.java).size > 0
+        var i = 0
+        while (i < 10 && !bubbleAppeared) {
+            solo!!.sleep(shortDelay)
+            bubbleAppeared = solo!!.getCurrentViews(
+                    BubbleActivity.BubbleView::class.java)
+                    .size > 0
+            i++
+        }
+
+        // Assert that a bubble was displayed
+        Assert.assertTrue("Bubble hasn't appeared", bubbleAppeared)
+
+        // The bubble moves a bit too slowly, so the test fails
+        solo!!.sleep(delay2)
+
+        // Assert that the bubble has left the screen
+        Assert.assertEquals(
+                "Bubble hasn't left the screen",
+                0,
+                solo!!.getCurrentViews(
+                        BubbleActivity.BubbleView::class.java)
+                        .size)
+
+    }
+}

Labs/Lab8_GesturesLab/app/src/androidTest/java/course/labs/gestureslab/test/BubbleActivityMenu.kt

+package course.labs.gestureslab.test
+
+import android.test.ActivityInstrumentationTestCase2
+import android.view.WindowManager
+
+import com.robotium.solo.Solo
+
+import course.labs.gestureslab.BubbleActivity
+import junit.framework.Assert
+
+
+class BubbleActivityMenu : ActivityInstrumentationTestCase2<BubbleActivity>(BubbleActivity::class.java) {
+    private var solo: Solo? = null
+
+    @Throws(Exception::class)
+    public override fun setUp() {
+        solo = Solo(instrumentation, activity)
+        instrumentation.runOnMainSync {
+            activity.window.addFlags(
+                    WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD)
+        }
+    }
+
+    @Throws(Exception::class)
+    public override fun tearDown() {
+        solo!!.finishOpenedActivities()
+    }
+
+    fun testRun() {
+
+        val delay = 2000
+
+        // Wait for activity: 'course.labs.TouchLab.BubbleActivity'
+        solo!!.waitForActivity(BubbleActivity::class.java, 2000)
+
+        solo!!.clickOnActionBarItem(course.labs.gestureslab.R.id.menu_still_mode)
+
+        solo!!.sleep(delay)
+
+        //Gesture starting top left to open menu
+        solo!!.drag(0f, 300f, 300f, 350f, 10)
+
+        solo!!.sleep(delay)
+
+        //checking if menu opened by clicking on a menu item
+        //without opening the menu.
+        Assert.assertTrue("Menu did not appear", solo!!.waitForText("Random Speed Mode"))
+
+    }
+}

Labs/Lab8_GesturesLab/app/src/androidTest/java/course/labs/gestureslab/test/BubbleActivityMultiple.kt

+package course.labs.gestureslab.test
+
+import course.labs.gestureslab.BubbleActivity
+
+import com.robotium.solo.*
+import android.test.ActivityInstrumentationTestCase2
+import android.view.WindowManager
+import junit.framework.Assert
+
+class BubbleActivityMultiple : ActivityInstrumentationTestCase2<BubbleActivity>(BubbleActivity::class.java) {
+    private var solo: Solo? = null
+
+    @Throws(Exception::class)
+    public override fun setUp() {
+        solo = Solo(instrumentation, activity)
+        instrumentation.runOnMainSync {
+            activity.window.addFlags(
+                    WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD)
+        }
+
+    }
+
+    @Throws(Exception::class)
+    public override fun tearDown() {
+        solo!!.finishOpenedActivities()
+    }
+
+    fun testRun() {
+
+        val delay = 2000
+
+        // Wait for activity: 'course.labs.TouchLab.BubbleActivity'
+        solo!!.waitForActivity(BubbleActivity::class.java,
+                delay)
+
+        // Set Still Mode
+        solo!!.clickOnActionBarItem(course.labs.gestureslab.R.id.menu_still_mode)
+
+        solo!!.sleep(delay)
+
+        // Click to create a bubble
+        solo!!.clickOnScreen(100f, 100f)
+
+        solo!!.sleep(delay)
+
+        // Assert that a bubble was displayed
+        Assert.assertEquals(
+                "Bubble hasn't appeared",
+                1,
+                solo!!.getCurrentViews(
+                        BubbleActivity.BubbleView::class.java)
+                        .size)
+
+        // Click to create second bubble
+        solo!!.clickOnScreen(300f, 300f)
+
+        solo!!.sleep(delay)
+
+        // Assert that a bubble was displayed
+        Assert.assertEquals(
+                "Second bubble hasn't appeared",
+                2,
+                solo!!.getCurrentViews(
+                        BubbleActivity.BubbleView::class.java)
+                        .size)
+
+        solo!!.sleep(delay)
+
+        // Give misbehaving bubbles a chance to move off screen
+        // Assert that there are two bubbles on the screen
+        Assert.assertEquals(
+                "There should be two bubbles on the screen",
+                2,
+                solo!!.getCurrentViews(
+                        BubbleActivity.BubbleView::class.java)
+                        .size)
+    }
+}

Labs/Lab8_GesturesLab/app/src/androidTest/java/course/labs/gestureslab/test/BubbleActivityPop.kt

+package course.labs.gestureslab.test
+
+import course.labs.gestureslab.BubbleActivity
+
+import com.robotium.solo.*
+import android.test.ActivityInstrumentationTestCase2
+import android.view.WindowManager
+import junit.framework.Assert
+
+class BubbleActivityPop : ActivityInstrumentationTestCase2<BubbleActivity>(BubbleActivity::class.java) {
+    private var solo: Solo? = null
+
+    @Throws(Exception::class)
+    public override fun setUp() {
+        solo = Solo(instrumentation, activity)
+        instrumentation.runOnMainSync {
+            activity.window.addFlags(
+                    WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD)
+        }
+    }
+
+    @Throws(Exception::class)
+    public override fun tearDown() {
+        solo!!.finishOpenedActivities()
+    }
+
+    fun testRun() {
+
+        val delay = 2000
+
+        // Wait for activity: 'course.labs.TouchLab.BubbleActivity'
+        solo!!.waitForActivity(BubbleActivity::class.java,
+                delay)
+
+        // Set Still Mode
+        solo!!.clickOnActionBarItem(course.labs.gestureslab.R.id.menu_still_mode)
+
+        solo!!.sleep(delay)
+
+        // Click to create a bubble
+        solo!!.clickOnScreen(250f, 250f)
+
+        solo!!.sleep(delay)
+
+        // Assert that a bubble was displayed
+        Assert.assertEquals(
+                "Bubble hasn't appeared",
+                1,
+                solo!!.getCurrentViews(
+                        BubbleActivity.BubbleView::class.java)
+                        .size)
+
+        // Click to remove the same bubble
+        solo!!.clickOnScreen(250f, 250f)
+
+        solo!!.sleep(delay)
+
+        // Assert that there are no more bubbles
+        Assert.assertEquals(
+                "The bubble was not popped",
+                0,
+                solo!!.getCurrentViews(
+                        BubbleActivity.BubbleView::class.java)
+                        .size)
+
+    }
+}

Labs/Lab8_GesturesLab/app/src/androidTest/java/course/labs/gestureslab/test/BubbleActivityTen.kt

+package course.labs.gestureslab.test
+
+import android.test.ActivityInstrumentationTestCase2
+import android.view.WindowManager
+
+import com.robotium.solo.Solo
+
+import course.labs.gestureslab.BubbleActivity
+import junit.framework.Assert
+
+class BubbleActivityTen : ActivityInstrumentationTestCase2<BubbleActivity>(BubbleActivity::class.java) {
+    private var solo: Solo? = null
+
+    @Throws(Exception::class)
+    public override fun setUp() {
+        solo = Solo(instrumentation, activity)
+        instrumentation.runOnMainSync {
+            activity.window.addFlags(
+                    WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD)
+        }
+    }
+
+    @Throws(Exception::class)
+    public override fun tearDown() {
+        solo!!.finishOpenedActivities()
+    }
+
+    fun testRun() {
+
+        val delay = 2000
+
+        // Wait for activity: 'course.labs.TouchLab.BubbleActivity'
+        solo!!.waitForActivity(BubbleActivity::class.java, 2000)
+
+        // Set Still Mode
+        solo!!.clickOnActionBarItem(course.labs.gestureslab.R.id.menu_still_mode)
+
+        solo!!.sleep(delay)
+
+        //Gesture starting in top right to add ten bubbles
+        solo!!.drag(300f, 0f, 200f, 300f, 10)
+
+        solo!!.sleep(delay)
+
+        // Give misbehaving bubbles a chance to move off screen
+        // Assert that there are two bubbles on the screen
+        Assert.assertEquals(
+                "There should be ten bubbles on the screen",
+                10,
+                solo!!.getCurrentViews(
+                        BubbleActivity.BubbleView::class.java)
+                        .size)
+
+    }
+}

Labs/Lab8_GesturesLab/app/src/main/AndroidManifest.xml

+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="course.labs.gestureslab"
+    android:versionCode="1"
+    android:versionName="1.0" >
+
+    <application
+        android:allowBackup="false"
+        android:icon="@drawable/icon"
+        android:label="@string/app_name" >
+  
+        <activity
+            android:name=".BubbleActivity"
+            android:label="@string/app_name"
+            android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>
\ No newline at end of file

Labs/Lab8_GesturesLab/app/src/main/java/course/labs/gestureslab/BubbleActivity.kt

+package course.labs.gestureslab
+
+import android.annotation.SuppressLint
+import android.app.Activity
+import android.content.Context
+import android.gesture.Gesture
+import android.gesture.GestureLibraries
+import android.gesture.GestureLibrary
+import android.gesture.Prediction
+import android.gesture.GestureOverlayView
+import android.gesture.GestureOverlayView.OnGesturePerformedListener
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import android.graphics.Canvas
+import android.graphics.Paint
+import android.media.AudioAttributes
+import android.media.AudioManager
+import android.media.SoundPool
+import android.os.Bundle
+import android.util.Log
+import android.view.*
+import android.widget.FrameLayout
+import android.widget.Toast
+import java.util.*
+import java.util.concurrent.Executors
+import java.util.concurrent.ScheduledFuture
+import java.util.concurrent.TimeUnit
+
+
+class BubbleActivity : Activity(), OnGesturePerformedListener {
+
+    // The Main view
+    private var mFrame: FrameLayout? = null
+
+    // Bubble image's bitmap
+    private var mBitmap: Bitmap? = null
+
+    // Display dimensions
+    private var mDisplayWidth: Int = 0
+    private var mDisplayHeight: Int = 0
+
+    // Sound variables
+
+    // AudioManager
+    private var mAudioManager: AudioManager? = null
+    // SoundPool
+    private var mSoundPool: SoundPool? = null
+    // ID for the bubble popping sound
+    private var mSoundID: Int = 0
+    // Audio volume
+    private var mStreamVolume: Float = 0.toFloat()
+
+    // Gesture Detector
+    private var mGestureDetector: GestureDetector? = null
+
+    // Gesture Library
+    private var mLibrary: GestureLibrary? = null
+
+    @SuppressLint("ClickableViewAccessibility")
+    public override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        setContentView(R.layout.main)
+
+        // Set up user interface
+        mFrame = findViewById<View>(R.id.frame) as FrameLayout
+
+        // Load basic bubble Bitmap
+        mBitmap = BitmapFactory.decodeResource(resources, R.drawable.b64)
+
+        // TODO - Fetch GestureLibrary from raw
+
+
+        val gestureOverlay = findViewById<View>(R.id.gestures_overlay) as GestureOverlayView
+
+        // TODO - Make this the target of gesture detection callbacks
+
+        // TODO - implement OnTouchListener to pass all events received by the
+        // gestureOverlay to the basic gesture detector
+
+        gestureOverlay.setOnTouchListener { v, event ->
+            true || false
+        }
+
+        // Uncomment to remove gesture highlights
+        // gestureOverlay.setUncertainGestureColor(Color.TRANSPARENT);
+
+        mLibrary?.apply {
+            if (!load()) {
+                Log.i(TAG, "Could not load Gesture Library")
+            }
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+
+        // Manage bubble popping sound
+        // Use AudioManager.STREAM_MUSIC as stream type
+
+        mAudioManager = getSystemService(Context.AUDIO_SERVICE) as AudioManager
+
+        mStreamVolume = mAudioManager!!
+            .getStreamVolume(AudioManager.STREAM_MUSIC).toFloat() / mAudioManager!!.getStreamMaxVolume(
+            AudioManager.STREAM_MUSIC
+        )
+
+        val musicAttribute = AudioAttributes.Builder()
+            .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
+            .build()
+        mSoundPool = SoundPool.Builder()
+            .setMaxStreams(10)
+            .setAudioAttributes(musicAttribute)
+            .build()
+
+        mSoundID = mSoundPool!!.load(this, R.raw.bubble_pop, 1)
+        // setupGestureDetector()
+        mSoundPool!!.setOnLoadCompleteListener { _, _, _ -> setupGestureDetector() }
+
+        mSoundID = mSoundPool!!.load(this, R.raw.bubble_pop, 1)
+
+    }
+
+    override fun onWindowFocusChanged(hasFocus: Boolean) {
+        super.onWindowFocusChanged(hasFocus)
+        if (hasFocus) {
+
+            // Get the size of the display so this View knows where borders are
+            mDisplayWidth = mFrame!!.width
+            mDisplayHeight = mFrame!!.height
+
+        }
+    }
+
+    // Set up GestureDetector
+    private fun setupGestureDetector() {
+
+        mGestureDetector = GestureDetector(this,
+            object : GestureDetector.SimpleOnGestureListener() {
+
+                // If a fling gesture starts on a BubbleView then change the
+                // BubbleView's velocity
+
+                override fun onFling(
+                    event1: MotionEvent,
+                    event2: MotionEvent, velocityX: Float, velocityY: Float
+                ): Boolean {
+
+                    // TODO - Implement onFling actions.
+                    // You can get all Views in mFrame one at a time
+                    // using the ViewGroup.getChildAt() method
+
+
+                    return true
+                }
+
+                // If a single tap intersects a BubbleView, then pop the
+                // BubbleView
+                // Otherwise, create a new BubbleView at the tap's location
+                // and add
+                // it to mFrame. You can get all views from mFrame with
+                // ViewGroup.getChildAt()
+
+                override fun onSingleTapConfirmed(event: MotionEvent): Boolean {
+
+                    // TODO - Implement onSingleTapConfirmed actions.
+                    // You can get all Views in mFrame using the
+                    // ViewGroup.getChildCount() method
+
+
+                    return true
+                }
+
+                // Good practice to override this method because all
+                // gestures start with a ACTION_DOWN event
+                override fun onDown(event: MotionEvent): Boolean {
+                    return true
+                }
+            })
+    }
+
+    override fun onPause() {
+
+        // Release all SoundPool resources
+
+        mSoundPool!!.unload(mSoundID)
+        mSoundPool!!.release()
+        mSoundPool = null
+
+        super.onPause()
+    }
+
+    override fun onGesturePerformed(overlay: GestureOverlayView, gesture: Gesture) {
+
+        // TODO - Get gesture predictions
+        val predictions: ArrayList<Prediction>? = null
+
+        if (predictions!!.size > 0) {
+
+            // Get highest-ranked prediction
+            val prediction = predictions[0]
+            // Log.i(TAG, "pred:" + prediction.name + " score:" + prediction.score)
+
+            // TODO - Ignore predictions with a score of < MIN_PRED_SCORE and display a
+            // toast message
+            // informing the user that no prediction was made. If the prediction
+            // matches
+            // the openmenu gesture, open the menu. If the prediction matches
+            // the addTen
+            // gesture, add 10 bubbles to the screen.
+
+
+
+
+        } else {
+
+
+        }
+    }
+
+    // BubbleView is a View that displays a bubble.
+    // This class handles animating, drawing, and popping amongst other actions.
+    // A new BubbleView is created for each bubble on the display
+
+    inner class BubbleView internal constructor(context: Context, x: Float, y: Float) :
+        View(context) {
+        private val mPainter = Paint()
+        private var mMoverFuture: ScheduledFuture<*>? = null
+        private var mScaledBitmapWidth: Int = 0
+        private var mScaledBitmap: Bitmap? = null
+        private val BITMAP_SIZE = 64
+        private val REFRESH_RATE = 40
+        // location, speed and direction of the bubble
+        private var mXPos: Float = 0.toFloat()
+        private var mYPos: Float = 0.toFloat()
+        private var mDx: Float = 0.toFloat()
+        private var mDy: Float = 0.toFloat()
+        private val mRadius: Float
+        private val mRadiusSquared: Float
+        private var mRotate: Long = 0
+        private var mDRotate: Long = 0
+
+        // Return true if the BubbleView is not on the screen after the move
+        // operation
+        private val isOutOfView: Boolean
+            get() = (mXPos < 0 - mScaledBitmapWidth || mXPos > mDisplayWidth
+                    || mYPos < 0 - mScaledBitmapWidth || mYPos > mDisplayHeight)
+
+        init {
+            Log.i(TAG, "Creating Bubble at: x:$x y:$y")
+
+            // Create a new random number generator to
+            // randomize size, rotation, speed and direction
+            val r = Random()
+
+            // Creates the bubble bitmap for this BubbleView
+            createScaledBitmap(r)
+
+            // Radius of the Bitmap
+            mRadius = (mScaledBitmapWidth / 2).toFloat()
+            mRadiusSquared = mRadius * mRadius
+
+            // Adjust position to center the bubble under user's finger
+            mXPos = x - mRadius
+            mYPos = y - mRadius
+
+            // Set the BubbleView's speed and direction
+            setSpeedAndDirection(r)
+
+            // Set the BubbleView's rotation
+            setRotation(r)
+
+            mPainter.isAntiAlias = true
+
+        }
+
+        private fun setRotation(r: Random) {
+
+            mDRotate = if (speedMode == RANDOM) {
+
+                // Set rotation in range [1..3]
+                ((r.nextInt(3 * BITMAP_SIZE) + 1) / mScaledBitmapWidth).toLong()
+            } else {
+                0
+            }
+        }
+
+        private fun setSpeedAndDirection(r: Random) {
+
+            // Used by test cases
+            when (speedMode) {
+
+                SINGLE -> {
+
+                    mDx = 20f
+                    mDy = 20f
+                }
+
+                STILL -> {
+
+                    // No speed
+                    mDx = 0f
+                    mDy = 0f
+                }
+
+                else -> {
+
+                    // Set movement direction and speed
+                    // Limit movement speed in the x and y
+                    // direction to [-3..3] pixels per movement.
+
+                    mDx = (r.nextInt(mScaledBitmapWidth * 3) + 1) / mScaledBitmapWidth.toFloat()
+                    mDx *= (if (r.nextInt() % 2 == 0) 1 else -1).toFloat()
+
+                    mDy = (r.nextInt(mScaledBitmapWidth * 3) + 1) / mScaledBitmapWidth.toFloat()
+                    mDy *= (if (r.nextInt() % 2 == 0) 1 else -1).toFloat()
+                }
+            }
+        }
+
+        private fun createScaledBitmap(r: Random) {
+
+            mScaledBitmapWidth = if (speedMode != RANDOM) {
+                BITMAP_SIZE * 3
+            } else {
+
+                // Set scaled bitmap size in range [1..3] * BITMAP_SIZE
+                r.nextInt(2 * BITMAP_SIZE) + BITMAP_SIZE
+
+            }
+
+            // Create the scaled bitmap using size set above
+            mScaledBitmap = Bitmap.createScaledBitmap(
+                mBitmap!!,
+                mScaledBitmapWidth, mScaledBitmapWidth, false
+            )
+        }
+
+        // Start moving the BubbleView & updating the display
+        fun start() {
+
+            // Creates a WorkerThread
+            val executor = Executors
+                .newScheduledThreadPool(1)
+
+            // Execute the run() in Worker Thread every REFRESH_RATE
+            // milliseconds
+            // Save reference to this job in mMoverFuture
+            mMoverFuture = executor.scheduleWithFixedDelay({
+                // Implement movement logic.
+                // Each time this method is run the BubbleView should
+                // move one step. If the BubbleView exits the display,
+                // stop the BubbleView's Worker Thread.
+                // Otherwise, request that the BubbleView be redrawn.
+
+                if (moveWhileOnScreen()) {
+                    postInvalidate()
+                } else
+                    stop(false)
+            }, 0, REFRESH_RATE.toLong(), TimeUnit.MILLISECONDS)
+        }
+
+        // Returns true if the BubbleView intersects position (x,y)
+        @Synchronized
+        fun intersects(x: Float, y: Float): Boolean {
+
+            //Return true if the BubbleView intersects position (x,y)
+
+            val xDist = x - (mXPos + mRadius)
+            val yDist = y - (mYPos + mRadius)
+
+            return xDist * xDist + yDist * yDist <= mRadiusSquared
+
+        }
+
+        // Cancel the Bubble's movement
+        // Remove Bubble from mFrame
+        // Play pop sound if the BubbleView was popped
+        //
+        fun stop(wasPopped: Boolean) {
+
+            if (null != mMoverFuture) {
+
+                if (!mMoverFuture!!.isDone) {
+                    mMoverFuture!!.cancel(true)
+                }
+
+                // This work will be performed on the UI Thread
+                mFrame!!.post {
+                    // Remove the BubbleView from mFrame
+                    mFrame!!.removeView(this@BubbleView)
+
+                    // If the bubble was popped by user,
+                    // play the popping sound
+                    if (wasPopped) {
+                        mSoundPool!!.play(
+                            mSoundID, mStreamVolume,
+                            mStreamVolume, 1, 0, 1.0f
+                        )
+                    }
+                }
+            }
+        }
+
+        // Change the Bubble's speed and direction
+        @Synchronized
+        fun deflect(velocityX: Float, velocityY: Float) {
+            mDx = velocityX / REFRESH_RATE
+            mDy = velocityY / REFRESH_RATE
+        }
+
+        // Draw the Bubble at its current location
+        @Synchronized
+        override fun onDraw(canvas: Canvas) {
+
+            // Save the canvas
+            canvas.save()
+
+            // Increase the rotation of the original image by mDRotate
+            mRotate += mDRotate
+
+            // Rotate the canvas by current rotation
+            // Hint - Rotate around the bubble's center, not its position
+
+            canvas.rotate(
+                mRotate.toFloat(),
+                mXPos + mScaledBitmapWidth / 2,
+                mYPos + mScaledBitmapWidth / 2
+            )
+
+            // Draw the bitmap at it's new location
+            canvas.drawBitmap(mScaledBitmap!!, mXPos, mYPos, mPainter)
+
+            // Restore the canvas
+            canvas.restore()
+
+        }
+
+        // Returns true if the BubbleView is still on the screen after the move
+        // operation
+        @Synchronized
+        private fun moveWhileOnScreen(): Boolean {
+
+            // Move the BubbleView
+
+            mXPos += mDx
+            mYPos += mDy
+
+            return !isOutOfView
+
+        }
+
+//        companion object {
+//
+//            private val BITMAP_SIZE = 64
+//            private val REFRESH_RATE = 40
+//        }
+    }
+
+    // Do not modify below here
+
+    override fun onBackPressed() {
+        openOptionsMenu()
+    }
+
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
+        super.onCreateOptionsMenu(menu)
+
+        menuInflater.inflate(R.menu.menu, menu)
+
+        return true
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        when (item.itemId) {
+            R.id.menu_still_mode -> {
+                speedMode = STILL
+                return true
+            }
+            R.id.menu_single_speed -> {
+                speedMode = SINGLE
+                return true
+            }
+            R.id.menu_random_mode -> {
+                speedMode = RANDOM
+                return true
+            }
+            R.id.quit -> {
+                exitRequested()
+                return true
+            }
+            else -> return super.onOptionsItemSelected(item)
+        }
+    }
+
+    private fun exitRequested() {
+        super.onBackPressed()
+    }
+
+    companion object {
+
+        private const val MIN_PRED_SCORE = 3.0
+        // These variables are for testing purposes, do not modify
+        private const val RANDOM = 0
+        private const val SINGLE = 1
+        private const val STILL = 2
+        var speedMode = RANDOM
+
+        private const val TAG = "Lab-Gestures"
+    }
+}

Labs/Lab8_GesturesLab/app/src/main/res/layout/main.xml

+<?xml version="1.0" encoding="utf-8"?>
+<android.gesture.GestureOverlayView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/gestures_overlay"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:gestureStrokeLengthThreshold="200.0" >
+
+    <FrameLayout
+        android:id="@+id/frame"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_centerInParent="true"
+        android:background="#222222" >
+    </FrameLayout>
+
+</android.gesture.GestureOverlayView>
\ No newline at end of file