manuelvicnt · January 1, 2023 17:05 · Jun 22, 2022 · Oct 26, 2020 · Jun 19, 2020 · Jun 19, 2020
diff --git a/AnAndroidApp.kt b/AnAndroidApp.kt
@@ -1,3 +1,8 @@
+// IMPORTANT! READ THIS FIRST
+// Assisted Injection doesn't work with @HiltViewModel or @ViewModelInject
+// Read more about the issue here: https://github.com/google/dagger/issues/2287
+//
+//
 // AssistedInject and Hilt working together in v2.28-alpha times
 // Example of a ViewModel using AssistedInject injected in a Fragment by Hilt
 // As AssistedInject isn't part of Dagger yet, we cannot use in

diff --git a/AnAndroidApp.kt b/AnAndroidApp.kt
@@ -30,6 +30,7 @@ class MyViewModel @AssistedInject constructor(
 }
 
 
+// This code uses "com.squareup.inject:assisted-inject-annotations-dagger2:0.5.2"
 // AssistedInject puts all assisted bindings in the same module.
 // We need to make a decision about where to install it. 
 // In this case, as we only need it in fragments, we install it there.

diff --git a/AnAndroidApp.kt b/AnAndroidApp.kt
@@ -7,6 +7,7 @@ data class MyInitParams(private val neededId: String)
 
 class MyViewModel @AssistedInject constructor(
   ... // Other dependencies injected by Hilt
+  // com.squareup.inject.assisted.Assisted annotation
   @Assisted private val initParams: MyInitParams
 ) : ViewModel() {
   ... // ViewModel logic

diff --git a/AnAndroidApp.kt b/AnAndroidApp.kt
@@ -1,23 +1,28 @@
 // AssistedInject and Hilt working together in v2.28-alpha times
 // Example of a ViewModel using AssistedInject injected in a Fragment by Hilt
+// As AssistedInject isn't part of Dagger yet, we cannot use in
+// conjuction with @ViewModelInject
+
+data class MyInitParams(private val neededId: String)
 
 class MyViewModel @AssistedInject constructor(
-  @Assisted private val assistedId: String
+  ... // Other dependencies injected by Hilt
+  @Assisted private val initParams: MyInitParams
 ) : ViewModel() {
   ... // ViewModel logic
 
   @AssistedInject.Factory
   interface AssistedFactory {
-    fun create(assistedId: String): MyViewModel
+    fun create(initParams: MyInitParams): MyViewModel
   }
 
   companion object {
     fun provideFactory(
         assistedFactory: AssistedFactory,
-        assistedId: String
+        initParams: MyInitParams
     ): ViewModelProvider.Factory = object : ViewModelProvider.Factory {
          override fun <T : ViewModel?> create(modelClass: Class<T>): T {
-           return assistedFactory.create(assitedId) as T
+           return assistedFactory.create(initParams) as T
          }
     }
   }
@@ -37,19 +42,22 @@ interface AssistedInjectModule {}
 @AndroidEntryPoint // Fragment injected by Hilt
 class MyFragment : Fragment() {
 
+  private val args: MyFragmentArgs by navArgs()
+
   // Inject the factory generated by AssistedInject
   @Inject lateinit var myViewModelAssistedFactory: MyViewModel.AssistedFactory
 
   // Initialize the ViewModel using ViewModelProvider.Factory 
   private val myViewModel: MyViewModel by viewModels {
     MyViewModel.provideFactory(
-      myViewModelAssistedFactory, "assistedId"
+      myViewModelAssistedFactory, MyInitParams(args.neededId)
     )
   }
 
   ... // Fragment logic
 }
 
+
 // To disable checking for the InstallIn annotation in some modules,
 // you need to enable the compiler option in your build.gradle file like this:
 android {

diff --git a/AnAndroidApp.kt b/AnAndroidApp.kt
@@ -4,8 +4,7 @@
 class MyViewModel @AssistedInject constructor(
   @Assisted private val assistedId: String
 ) : ViewModel() {
-
-  // ViewModel logic
+  ... // ViewModel logic
 
   @AssistedInject.Factory
   interface AssistedFactory {
@@ -47,6 +46,8 @@ class MyFragment : Fragment() {
       myViewModelAssistedFactory, "assistedId"
     )
   }
+
+  ... // Fragment logic
 }
 
 // To disable checking for the InstallIn annotation in some modules,

diff --git a/AnAndroidApp.kt b/AnAndroidApp.kt
@@ -38,7 +38,10 @@ interface AssistedInjectModule {}
 @AndroidEntryPoint // Fragment injected by Hilt
 class MyFragment : Fragment() {
 
+  // Inject the factory generated by AssistedInject
   @Inject lateinit var myViewModelAssistedFactory: MyViewModel.AssistedFactory
+
+  // Initialize the ViewModel using ViewModelProvider.Factory 
   private val myViewModel: MyViewModel by viewModels {
     MyViewModel.provideFactory(
       myViewModelAssistedFactory, "assistedId"

diff --git a/AnAndroidApp.kt b/AnAndroidApp.kt
@@ -0,0 +1,59 @@
+// AssistedInject and Hilt working together in v2.28-alpha times
+// Example of a ViewModel using AssistedInject injected in a Fragment by Hilt
+
+class MyViewModel @AssistedInject constructor(
+  @Assisted private val assistedId: String
+) : ViewModel() {
+
+  // ViewModel logic
+
+  @AssistedInject.Factory
+  interface AssistedFactory {
+    fun create(assistedId: String): MyViewModel
+  }
+
+  companion object {
+    fun provideFactory(
+        assistedFactory: AssistedFactory,
+        assistedId: String
+    ): ViewModelProvider.Factory = object : ViewModelProvider.Factory {
+         override fun <T : ViewModel?> create(modelClass: Class<T>): T {
+           return assistedFactory.create(assitedId) as T
+         }
+    }
+  }
+}
+
+
+// AssistedInject puts all assisted bindings in the same module.
+// We need to make a decision about where to install it. 
+// In this case, as we only need it in fragments, we install it there.
+@InstallIn(FragmentComponent::class)
+@AssistedModule
+@Module(includes = [AssistedInject_AssistedInjectModule::class])
+// Needed until AssistedInject is incorporated into Dagger
+interface AssistedInjectModule {}
+
+
+@AndroidEntryPoint // Fragment injected by Hilt
+class MyFragment : Fragment() {
+
+  @Inject lateinit var myViewModelAssistedFactory: MyViewModel.AssistedFactory
+  private val myViewModel: MyViewModel by viewModels {
+    MyViewModel.provideFactory(
+      myViewModelAssistedFactory, "assistedId"
+    )
+  }
+}
+
+// To disable checking for the InstallIn annotation in some modules,
+// you need to enable the compiler option in your build.gradle file like this:
+android {
+    defaultConfig {
+        javaCompileOptions {
+            annotationProcessorOptions {
+                arguments["dagger.hilt.disableModulesHaveInstallInCheck"] = "true"
+            }
+        }
+    }
+}
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