Step.08-Solution-Schedule-Background-Work

Author: Jill Heske

app/src/main/java/com/example/android/devbyteviewer/DevByteApplication.kt

@@ -18,28 +18,49 @@
 package com.example.android.devbyteviewer
 
 import android.app.Application
+import android.os.Build
+import androidx.work.*
+import com.example.android.devbyteviewer.work.RefreshDataWorker
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 import timber.log.Timber
+import java.util.concurrent.TimeUnit
 
 /**
  * Override application to setup background work via WorkManager
  */
 class DevByteApplication : Application() {
 
-    // TODO (01) Create CoroutineScope variable applicationScope, using Dispatchers.Default.
+    val applicationScope = CoroutineScope(Dispatchers.Default)
 
-    // TODO (02) Create a delayedInit() function that calls setupRecurringWork() in
-    // the coroutine you defined above.
-
-    // TODO (04) Create a setupRecurringWork() function and use a Builder to define a
-    // repeatingRequest variable to handle scheduling work.
+    private fun delayedInit() {
+        applicationScope.launch {
+            setupRecurringWork()
+        }
+    }
 
-    // TODO (05) In setupRecurringWork(), get an instance of WorkManager and
-    // launch call enqueuPeriodicWork() to schedule the work.
+    private fun setupRecurringWork() {
+        val constraints = Constraints.Builder()
+                .setRequiredNetworkType(NetworkType.UNMETERED)
+                .setRequiresBatteryNotLow(true)
+                .setRequiresCharging(true)
+                .apply {
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+                        setRequiresDeviceIdle(true)
+                    }
+                }.build()
 
-    // TODO (07) In setupRecurringWork(), define constraints to prevent work from occurring when
-    // there is no network access or the device is low on battery.
+        val repeatingRequest
+                = PeriodicWorkRequestBuilder<RefreshDataWorker>(1, TimeUnit.DAYS)
+                .setConstraints(constraints)
+                .build()
 
-    // TODO (08) Add the constraints to the repeatingRequest definition.
+        WorkManager.getInstance().enqueueUniquePeriodicWork(
+                RefreshDataWorker.WORK_NAME,
+                ExistingPeriodicWorkPolicy.KEEP,
+                repeatingRequest)
+    }
 
     /**
      * onCreate is called before the first screen is shown to the user.
@@ -50,6 +71,6 @@ class DevByteApplication : Application() {
     override fun onCreate() {
         super.onCreate()
         Timber.plant(Timber.DebugTree())
-        // TODO (03) Call delayedInit().
+        delayedInit()
     }
 }

app/src/main/java/com/example/android/devbyteviewer/work/RefreshDataWork.kt

@@ -27,7 +27,9 @@ import retrofit2.HttpException
 class RefreshDataWorker(appContext: Context, params: WorkerParameters):
         CoroutineWorker(appContext, params) {
 
-    // TODO (06) Create a companion object and define a WORK_NAME constant.
+    companion object {
+        const val WORK_NAME = "RefreshDataWorker"
+    }
 
     /**
      * A coroutine-friendly method to do your work.