无法使用Dagger Hilt`@ WorkerInject`来注入Android WorkManager Worker

Question

我正在尝试遵循https://developer.android.com/training/dependency-injection/hilt-jetpack#workmanager中的指南，并遇到以下错误

E/WM-WorkerFactory: Could not instantiate com.example.android.hilt.ExampleWorker
    java.lang.NoSuchMethodException: <init> [class android.content.Context, class androidx.work.WorkerParameters]

为了重现此问题，我在Dagger Hilt Example Repo中添加了根据实例编写的示例代码

class ExampleWorker @WorkerInject constructor(
    @Assisted appContext: Context,
    @Assisted workerParams: WorkerParameters,
    val workerDependency: AppNavigator
) : Worker(appContext, workerParams) {
    override fun doWork(): Result {
        Log.d("WORKER", "I am the worker, got dependency: $workerDependency")
        return Result.success()
    }
}

注意：AppNavigator在NavigationModule中以 @Binds abstract fun bindNavigator(impl: AppNavigatorImpl): AppNavigator。 另请注意，将AppNavigator替换为AppDatabase并没有帮助。

这就是我从@Singleton开始工作的方式>

MainActivity
不确定到底是什么问题。

这里是完整

修补程序文件，供完整参考

---

    override fun onStart() {
        super.onStart()
        enqueueWorker(applicationContext)
    }

    private fun enqueueWorker(context: Context) {
        val request = OneTimeWorkRequestBuilder<ExampleWorker>().build()
        WorkManager.getInstance(context).enqueue(request)
    }
    

我正在尝试遵循来自https://developer.android.com/training/dependency-injection/hilt-jetpack#workmanager的指南，并遇到以下错误E / WM-WorkerFactory：无法实例化com...。

Answer 1

根据

From 2d02d1b13b6c29d99ecf94d9f874b16ff8d451cf Mon Sep 17 00:00:00 2001
From: Hossain Khan <[email protected]>
Date: Fri, 12 Jun 2020 23:32:52 -0400
Subject: [PATCH] [BUG] Worker can not be injected using Dagger Hilt
 `@WorkerInject`

The example code is taken from https://developer.android.com/training/dependency-injection/hilt-jetpack#workmanager
Code is applied on top of https://github.com/googlecodelabs/android-hilt/tree/solution
---
 app/build.gradle                              |  6 ++++++
 .../com/example/android/hilt/ExampleWorker.kt | 20 +++++++++++++++++++
 .../example/android/hilt/LogApplication.kt    | 14 ++++++++++++-
 .../example/android/hilt/ui/MainActivity.kt   | 14 +++++++++++++
 4 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 app/src/main/java/com/example/android/hilt/ExampleWorker.kt

diff --git a/app/build.gradle b/app/build.gradle
index 4c04d61..d9f4c8c 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -44,6 +44,9 @@ android {
         sourceCompatibility 1.8
         targetCompatibility 1.8
     }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
 }

 dependencies {
@@ -64,8 +67,11 @@ dependencies {
     androidTestImplementation "androidx.test:rules:1.2.0"
     androidTestImplementation "androidx.test.espresso:espresso-core:3.2.0"

+    implementation "androidx.work:work-runtime-ktx:2.3.4"
+
     // Hilt dependencies
     implementation "com.google.dagger:hilt-android:$hilt_version"
+    implementation 'androidx.hilt:hilt-work:1.0.0-alpha01'
     kapt "com.google.dagger:hilt-android-compiler:$hilt_version"

     // Hilt testing dependencies
diff --git a/app/src/main/java/com/example/android/hilt/ExampleWorker.kt b/app/src/main/java/com/example/android/hilt/ExampleWorker.kt
new file mode 100644
index 0000000..bec00ee
--- /dev/null
+++ b/app/src/main/java/com/example/android/hilt/ExampleWorker.kt
@@ -0,0 +1,20 @@
+package com.example.android.hilt
+
+import android.content.Context
+import android.util.Log
+import androidx.hilt.Assisted
+import androidx.hilt.work.WorkerInject
+import androidx.work.Worker
+import androidx.work.WorkerParameters
+import com.example.android.hilt.navigator.AppNavigator
+
+class ExampleWorker @WorkerInject constructor(
+    @Assisted appContext: Context,
+    @Assisted workerParams: WorkerParameters,
+    val workerDependency: AppNavigator
+) : Worker(appContext, workerParams) {
+    override fun doWork(): Result {
+        Log.d("WORKER", "I am the worker, got dependency: $workerDependency")
+        return Result.success()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/android/hilt/LogApplication.kt b/app/src/main/java/com/example/android/hilt/LogApplication.kt
index 2c87931..de389e2 100644
--- a/app/src/main/java/com/example/android/hilt/LogApplication.kt
+++ b/app/src/main/java/com/example/android/hilt/LogApplication.kt
@@ -17,7 +17,19 @@
 package com.example.android.hilt

 import android.app.Application
+import androidx.hilt.work.HiltWorkerFactory
+import androidx.work.Configuration
 import dagger.hilt.android.HiltAndroidApp
+import javax.inject.Inject

 @HiltAndroidApp
-class LogApplication : Application()
+class LogApplication : Application(), Configuration.Provider {
+
+    @Inject
+    lateinit var workerFactory: HiltWorkerFactory
+
+    override fun getWorkManagerConfiguration() =
+        Configuration.Builder()
+            .setWorkerFactory(workerFactory)
+            .build()
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/android/hilt/ui/MainActivity.kt b/app/src/main/java/com/example/android/hilt/ui/MainActivity.kt
index 8c78072..15000e2 100644
--- a/app/src/main/java/com/example/android/hilt/ui/MainActivity.kt
+++ b/app/src/main/java/com/example/android/hilt/ui/MainActivity.kt
@@ -16,8 +16,12 @@

 package com.example.android.hilt.ui

+import android.content.Context
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
+import androidx.work.OneTimeWorkRequestBuilder
+import androidx.work.WorkManager
+import com.example.android.hilt.ExampleWorker
 import com.example.android.hilt.R
 import com.example.android.hilt.navigator.AppNavigator
 import com.example.android.hilt.navigator.Screens
@@ -50,4 +54,14 @@ class MainActivity : AppCompatActivity() {
             finish()
         }
     }
+
+    override fun onStart() {
+        super.onStart()
+        enqueueWorker(applicationContext)
+    }
+
+    private fun enqueueWorker(context: Context) {
+        val request = OneTimeWorkRequestBuilder<ExampleWorker>().build()
+        WorkManager.getInstance(context).enqueue(request)
+    }
 }
-- 
2.24.3 (Apple Git-128)

，要使用WorkManager Configuration and Initialization documentation上的Configuration.Provider接口，您必须Application：