├── .gitignore ├── .project ├── ASSETS_LICENSE.md ├── CONTRIBUTING.md ├── LICENSE ├── README.md ├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ └── main │ ├── AndroidManifest.xml │ ├── java │ └── com │ │ └── example │ │ └── background │ │ ├── Constant.kt │ │ ├── CoroutinesAsyncTask.kt │ │ └── MainActivity.kt │ └── res │ ├── layout │ └── activity_main.xml │ ├── mipmap-hdpi │ └── ic_launcher.png │ ├── mipmap-mdpi │ └── ic_launcher.png │ ├── mipmap-xhdpi │ └── ic_launcher.png │ ├── mipmap-xxhdpi │ └── ic_launcher.png │ ├── mipmap-xxxhdpi │ └── ic_launcher.png │ └── values │ ├── colors.xml │ ├── strings.xml │ └── styles.xml ├── build.gradle ├── circle.yml ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | secrets.txt 3 | .idea/ 4 | .gradle 5 | /local.properties 6 | .DS_Store 7 | build/ 8 | /captures 9 | .externalNativeBuild 10 | app/build 11 | build 12 | app/release/ -------------------------------------------------------------------------------- /.project: -------------------------------------------------------------------------------- 1 | 2 | 3 | WorkManagerSample 4 | Project WorkManagerSample created by Buildship. 5 | 6 | 7 | 8 | 9 | org.eclipse.buildship.core.gradleprojectbuilder 10 | 11 | 12 | 13 | 14 | 15 | org.eclipse.buildship.core.gradleprojectnature 16 | 17 | 18 | -------------------------------------------------------------------------------- /ASSETS_LICENSE.md: -------------------------------------------------------------------------------- 1 | # Asset Licenses 2 | 3 | The licenses for the asset files included in this demo can be found below. 4 | 5 | ## test.png 6 | 7 | Retreived from [https://www.ars.usda.gov/oc/images/photos/jun04/k11252-1/](https://www.ars.usda.gov/oc/images/photos/jun04/k11252-1/) on 28 April 2018. 8 | 9 | Photo courtesy of USDA Agricultural Research Service 10 | 11 | Photos in our Image Gallery are available free of charge and are copyright-free, public domain, images unless otherwise indicated. 12 | 13 | Please note: these photos may not be used to infer or imply ARS endorsement of any product, company, or position. 14 | 15 | When using these photos, we ask that you credit the Agricultural Research Service. 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-------------------------------------------------------------------------------- 1 | Replace Android Asynctask with Kotlin Coroutines 2 | =================================== 3 | 4 | This repository contains the class named as CoroutinesAsyncTask.kt which helps you to migrate your Asynctask to Kotlin Coroutine 5 | -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | .project 3 | .classpath 4 | .settings/org.eclipse.buildship.core.prefs 5 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright (C) 2018 The Android Open Source Project 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | apply plugin: 'com.android.application' 18 | apply plugin: 'kotlin-android-extensions' 19 | apply plugin: 'kotlin-android' 20 | 21 | android { 22 | compileSdkVersion versions.compileSdk 23 | defaultConfig { 24 | applicationId "com.example.background" 25 | renderscriptTargetApi 11 26 | renderscriptSupportModeEnabled true 27 | vectorDrawables { 28 | useSupportLibrary true 29 | } 30 | minSdkVersion versions.minSdk 31 | targetSdkVersion versions.targetSdk 32 | versionCode 1 33 | versionName "1.0" 34 | } 35 | buildTypes { 36 | release { 37 | minifyEnabled true 38 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 39 | } 40 | } 41 | compileOptions { 42 | sourceCompatibility JavaVersion.VERSION_1_8 43 | targetCompatibility JavaVersion.VERSION_1_8 44 | } 45 | } 46 | 47 | dependencies { 48 | implementation "androidx.appcompat:appcompat:1.1.0-rc01" 49 | implementation "androidx.constraintlayout:constraintlayout:2.0.0-beta2" 50 | implementation "androidx.lifecycle:lifecycle-extensions:2.0.0" 51 | implementation "androidx.work:work-runtime:$versions.work" 52 | implementation "com.github.bumptech.glide:glide:4.9.0" 53 | implementation "androidx.core:core-ktx:+" 54 | implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.0.0" 55 | implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version" 56 | implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.3' 57 | implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.1.1' 58 | } 59 | repositories { 60 | mavenCentral() 61 | } 62 | -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # You can control the set of applied configuration files using the 3 | # proguardFiles setting in build.gradle. 4 | # 5 | # For more details, see 6 | # http://developer.android.com/guide/developing/tools/proguard.html 7 | 8 | # Rendescript 9 | -keepclasseswithmembernames class * { 10 | native ; 11 | } 12 | 13 | -keep class androidx.renderscript.** { *; } 14 | 15 | 16 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 6 | 7 | 8 | 9 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/background/Constant.kt: -------------------------------------------------------------------------------- 1 | package com.example.background 2 | 3 | class Constant{ 4 | enum class Status { 5 | PENDING, 6 | RUNNING, 7 | FINISHED 8 | } 9 | } -------------------------------------------------------------------------------- /app/src/main/java/com/example/background/CoroutinesAsyncTask.kt: -------------------------------------------------------------------------------- 1 | package com.example.background 2 | 3 | import android.util.Log 4 | import com.example.background.Constant.Status 5 | import kotlinx.coroutines.* 6 | import java.util.concurrent.Executors 7 | 8 | abstract class CoroutinesAsyncTask(val taskName: String) { 9 | 10 | val TAG by lazy { 11 | CoroutinesAsyncTask::class.java.simpleName 12 | } 13 | 14 | companion object { 15 | private var threadPoolExecutor: CoroutineDispatcher? = null 16 | } 17 | 18 | var status: Status = Status.PENDING 19 | var preJob: Job? = null 20 | var bgJob: Deferred? = null 21 | abstract fun doInBackground(vararg params: Params?): Result 22 | open fun onProgressUpdate(vararg values: Progress?) {} 23 | open fun onPostExecute(result: Result?) {} 24 | open fun onPreExecute() {} 25 | open fun onCancelled(result: Result?) {} 26 | protected var isCancelled = false 27 | 28 | /** 29 | * Executes background task parallel with other background tasks in the queue using 30 | * default thread pool 31 | */ 32 | fun execute(vararg params: Params?) { 33 | execute(Dispatchers.Default, *params) 34 | } 35 | 36 | /** 37 | * Executes background tasks sequentially with other background tasks in the queue using 38 | * single thread executor @Executors.newSingleThreadExecutor(). 39 | */ 40 | fun executeOnExecutor(vararg params: Params?) { 41 | if (threadPoolExecutor == null) { 42 | threadPoolExecutor = Executors.newSingleThreadExecutor().asCoroutineDispatcher() 43 | } 44 | execute(threadPoolExecutor!!, *params) 45 | } 46 | 47 | private fun execute(dispatcher: CoroutineDispatcher, vararg params: Params?) { 48 | 49 | if (status != Status.PENDING) { 50 | when (status) { 51 | Status.RUNNING -> throw IllegalStateException("Cannot execute task:" + " the task is already running.") 52 | Status.FINISHED -> throw IllegalStateException("Cannot execute task:" 53 | + " the task has already been executed " 54 | + "(a task can be executed only once)") 55 | else -> { 56 | } 57 | } 58 | } 59 | 60 | status = Status.RUNNING 61 | 62 | // it can be used to setup UI - it should have access to Main Thread 63 | GlobalScope.launch(Dispatchers.Main) { 64 | preJob = launch(Dispatchers.Main) { 65 | printLog("$taskName onPreExecute started") 66 | onPreExecute() 67 | printLog("$taskName onPreExecute finished") 68 | bgJob = async(dispatcher) { 69 | printLog("$taskName doInBackground started") 70 | doInBackground(*params) 71 | } 72 | } 73 | preJob!!.join() 74 | if (!isCancelled) { 75 | withContext(Dispatchers.Main) { 76 | onPostExecute(bgJob!!.await()) 77 | printLog("$taskName doInBackground finished") 78 | status = Status.FINISHED 79 | } 80 | } 81 | } 82 | } 83 | 84 | fun cancel(mayInterruptIfRunning: Boolean) { 85 | if (preJob == null || bgJob == null) { 86 | printLog("$taskName has already been cancelled/finished/not yet started.") 87 | return 88 | } 89 | if (mayInterruptIfRunning || (!preJob!!.isActive && !bgJob!!.isActive)) { 90 | isCancelled = true 91 | status = Status.FINISHED 92 | if (bgJob!!.isCompleted) { 93 | GlobalScope.launch(Dispatchers.Main) { 94 | onCancelled(bgJob!!.await()) 95 | } 96 | } 97 | preJob?.cancel(CancellationException("PreExecute: Coroutine Task cancelled")) 98 | bgJob?.cancel(CancellationException("doInBackground: Coroutine Task cancelled")) 99 | printLog("$taskName has been cancelled.") 100 | } 101 | } 102 | 103 | fun publishProgress(vararg progress: Progress) { 104 | //need to update main thread 105 | GlobalScope.launch(Dispatchers.Main) { 106 | if (!isCancelled) { 107 | onProgressUpdate(*progress) 108 | } 109 | } 110 | } 111 | 112 | private fun printLog(message: String) { 113 | Log.d(TAG, message) 114 | } 115 | } -------------------------------------------------------------------------------- /app/src/main/java/com/example/background/MainActivity.kt: -------------------------------------------------------------------------------- 1 | package com.example.background 2 | 3 | import androidx.appcompat.app.AppCompatActivity 4 | import android.os.Bundle 5 | import android.view.View 6 | import com.example.background.Constant.Status 7 | import kotlinx.android.synthetic.main.activity_main.* 8 | import com.example.background.R 9 | 10 | 11 | class MainActivity : AppCompatActivity() { 12 | 13 | var task: MyAsyncTask? = null 14 | 15 | override fun onCreate(savedInstanceState: Bundle?) { 16 | super.onCreate(savedInstanceState) 17 | setContentView(R.layout.activity_main) 18 | } 19 | 20 | fun startService(view: View) { 21 | if (task?.status == Status.RUNNING){ 22 | task?.cancel(true) 23 | } 24 | task = MyAsyncTask(this) 25 | task?.execute(10) 26 | } 27 | 28 | class MyAsyncTask(private var activity: MainActivity?) : CoroutinesAsyncTask("MysAsyncTask") { 29 | 30 | override fun doInBackground(vararg params: Int?): String { 31 | for (count in 1..10){ 32 | if (isCancelled) 33 | break 34 | try { 35 | Thread.sleep(1000) 36 | publishProgress(count) 37 | } catch (e: InterruptedException){ 38 | e.printStackTrace() 39 | } 40 | } 41 | return "Done!!!" 42 | } 43 | 44 | override fun onPostExecute(result: String?) { 45 | activity?.progressBar?.visibility = View.GONE 46 | activity?.output?.text = result 47 | activity?.btn?.text = "Restart" 48 | } 49 | 50 | override fun onPreExecute() { 51 | activity?.output?.text = "Tast starting.." 52 | activity?.progressBar?.visibility = View.VISIBLE 53 | activity?.progressBar?.max = 10 54 | activity?.progressBar?.progress = 0 55 | 56 | } 57 | 58 | override fun onProgressUpdate(vararg values: Int?) { 59 | activity?.output?.text = "count is ${values.get(0).toString()}" 60 | values[0]?.let { activity?.progressBar?.setProgress(it) } 61 | } 62 | } 63 | } 64 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 7 | 8 | 15 |