Initial commit

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

TickerLibrary/.gitignore

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+/build

TickerLibrary/build.gradle.kts

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+plugins {
+    id("com.android.library")
+    id("org.jetbrains.kotlin.android")
+    id ("maven-publish")
+}
+
+android {
+    namespace = "com.example.tickerlibrary"
+    compileSdk = 32
+
+    defaultConfig {
+        minSdk = 21
+        targetSdk = 32
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles("consumer-rules.pro")
+    }
+
+    buildTypes {
+        getByName("release") {
+            isMinifyEnabled = false
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+    publishing {
+        singleVariant("release") {
+            withSourcesJar()
+            withJavadocJar()
+        }
+    }
+    namespace = "com.example.tickerlibrary"
+}
+
+dependencies {
+
+    implementation("androidx.core:core-ktx:1.7.0")
+    implementation("androidx.appcompat:appcompat:1.4.1")
+    implementation("com.google.android.material:material:1.5.0")
+    testImplementation("junit:junit:4.13.2")
+    androidTestImplementation("androidx.test.ext:junit:1.1.3")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.4.0")
+
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.4")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.4")
+}
+
+publishing {
+    publications {
+        register<MavenPublication>("release") {
+            groupId = "com.github.SyedAmmarSohail"
+            artifactId = "TickerLibrary"
+            version = "0.0.1"
+
+            afterEvaluate {
+                from(components["release"])
+            }
+        }
+    }
+}

TickerLibrary/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.kts.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

TickerLibrary/src/androidTest/java/com/example/tickerlibrary/ExampleInstrumentedTest.kt

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+package com.example.tickerlibrary
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.example.tickerlibrary.test", appContext.packageName)
+    }
+}

TickerLibrary/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+</manifest>

TickerLibrary/src/main/java/com/example/tickerlibrary/TickerImp.kt

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+package com.example.tickerlibrary
+
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleEventObserver
+import androidx.lifecycle.LifecycleOwner
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.isActive
+
+interface Ticker {
+    fun startTick(
+        secondValueInFuture: Long,
+        coroutineScope: CoroutineScope,
+        owner: LifecycleOwner,
+        onTick: (number: Long) -> Unit,
+        onComplete: () -> Unit
+    )
+
+    fun onTickerPause()
+}
+
+object TickerImp : Ticker, LifecycleEventObserver {
+
+    private var lastValue = 0L
+    private var ONE_MILLI_SECOND = 1000L
+
+    lateinit var scope: CoroutineScope
+
+    override fun startTick(
+        secondValueInFuture: Long,
+        coroutineScope: CoroutineScope,
+        owner: LifecycleOwner,
+        onTick: (number: Long) -> Unit,
+        onComplete: () -> Unit
+    ) {
+        owner.lifecycle.addObserver(this)
+        scope = coroutineScope
+
+        val startValue = getStartValue(secondValueInFuture)
+
+        tickerFlow(startValue)
+            .onEach {
+                lastValue = it
+                if (it == 0L) {
+                    onComplete()
+                } else {
+                    onTick(it)
+                }
+            }
+            .launchIn(coroutineScope)
+    }
+
+    override fun onTickerPause() {
+        if (scope.isActive) {
+            scope.cancel()
+        }
+    }
+
+    private fun getStartValue(secondValueInFuture: Long): Long {
+        return if (lastValue != 0L) lastValue else secondValueInFuture
+    }
+
+    private fun tickerFlow(
+        startValue: Long,
+    ) =
+        flow {
+            for (i in startValue downTo 0) {
+                emit(i)
+                delay(ONE_MILLI_SECOND)
+            }
+        }
+
+    override fun onStateChanged(source: LifecycleOwner, event: Lifecycle.Event) {
+        when (event) {
+            Lifecycle.Event.ON_RESUME -> {
+                print("Ticker: onResume")
+            }
+            Lifecycle.Event.ON_PAUSE -> {
+                print("Ticker: onPause")
+                if (scope.isActive)
+                    scope.cancel()
+            }
+            else -> Unit
+        }
+    }
+}

TickerLibrary/src/test/java/com/example/tickerlibrary/ExampleUnitTest.kt

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+package com.example.tickerlibrary
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}

app/.gitignore

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+/build