问题
I am working with Dagger 2 to create my dependency injection. It was working a few hours ago but now the components aren't generated anymore.
Here is where I am creating the components:
public class App extends Application {
CacheComponent mCacheComponent;
ApiComponent mApiComponent;
DataBaseComponent mDataBaseComponent;
@Override
public void onCreate() {
super.onCreate();
mCacheComponent = DaggerCacheComponent.builder()
.cacheModule(new CacheModule(getApplicationContext()))
.build();
mApiComponent = DaggerApiComponent.builder()
.apiModule(new ApiModule())
.build();
mDataBaseComponent = DaggerDataBaseComponent.builder()
.dataBaseModule(new DataBaseModule(getApplicationContext()))
.build();
}
public CacheComponent getCacheComponent(){ return mCacheComponent;}
public ApiComponent getApiComponent() { return mApiComponent; }
public DataBaseComponent getDataBaseComponent() { return mDataBaseComponent;}
}
This was working but now I get errors:
E:\AndroidProject\JoinTV\app\src\main\java\com\myproject\jointv\utils\App.java:7: error: cannot find symbol
import com.myproject.jointv.component.DaggerApiComponent;
^
symbol: class DaggerApiComponent
location: package com.myproject.jointv.component
E:\AndroidProject\JoinTV\app\src\main\java\com\myproject\jointv\utils\App.java:8: error: cannot find symbol
import com.myproject.jointv.component.DaggerCacheComponent;
^
symbol: class DaggerCacheComponent
location: package com.myproject.jointv.component
E:\AndroidProject\JoinTV\app\src\main\java\com\myproject\jointv\utils\App.java:9: error: cannot find symbol
import com.myproject.jointv.component.DaggerDataBaseComponent;
^
symbol: class DaggerDataBaseComponent
location: package com.myproject.jointv.component
Note: Resolve log file to E:\AndroidProject\JoinTV\app\build\generated\source\apt\androidannotations.log
Note: Initialize AndroidAnnotations 3.3.2 with options {androidManifestFile=E:\AndroidProject\JoinTV\app\build\intermediates\manifests\full\debug\AndroidManifest.xml, resourcePackage
Name=com.myproject.jointv}
Note: Start processing for 5 annotations on 32 elements
Note: AndroidManifest.xml file found with specified path: E:\AndroidProject\JoinTV\app\build\intermediates\manifests\full\debug\AndroidManifest.xml
Note: AndroidManifest.xml found: AndroidManifest [applicationPackage=com.myproject.jointv, componentQualifiedNames=[com.myproject.jointv.activities.MainActivity_, com.myproject
.jointv.activities.YoutubePlayerViewActivity, com.myproject.jointv.activities.VideoPlayerActivity_, com.myproject.jointv.services.ServiceDownloaderPlayList], permissionQualifiedN
ames=[android.permission.INTERNET, android.permission.WRITE_EXTERNAL_STORAGE], applicationClassName=com.myproject.jointv.utils.App, libraryProject=false, debugabble=false, minSdkVe
rsion=21, maxSdkVersion=-1, targetSdkVersion=23]
Note: Found project R class: com.myproject.jointv.R
Note: Found Android class: android.R
Note: Validating elements
Note: Validating with EActivityHandler: [com.myproject.jointv.activities.MainActivity, com.myproject.jointv.activities.VideoPlayerActivity]
Note: Validating with EFragmentHandler: [com.myproject.jointv.fragments.VideoPlayerFragment]
Note: Validating with ViewByIdHandler: [buttonPlay, videoView, videoView]
Note: Validating with FragmentArgHandler: [url, cachePath]
Note: Validating with AfterViewsHandler: [onViewInjected(), afterViewInjected()]
Note: Processing root elements
Note: Processing root elements EActivityHandler: [com.myproject.jointv.activities.VideoPlayerActivity, com.myproject.jointv.activities.MainActivity]
Note: Processing root elements EFragmentHandler: [com.myproject.jointv.fragments.VideoPlayerFragment]
Note: Processing enclosed elements
Note: Number of files generated by AndroidAnnotations: 3
Note: Writting following API classes in project: []
Note: Generating class: com.myproject.jointv.fragments.VideoPlayerFragment_
Note: Generating class: com.myproject.jointv.activities.MainActivity_
Note: Generating class: com.myproject.jointv.activities.VideoPlayerActivity_
Note: Time measurements: [Whole Processing = 387 ms], [Extract Manifest = 131 ms], [Generate Sources = 97 ms], [Process Annotations = 59 ms], [Find R Classes = 43 ms], [Extract Annot
ations = 25 ms], [Validate Annotations = 18 ms],
Note: Finish processing
E:\AndroidProject\JoinTV\app\src\main\java\com\myproject\jointv\component\ApiComponent.java:22: error: com.myproject.jointv.database.DataBaseHelper cannot be provided without an
@Inject constructor or from an @Provides- or @Produces-annotated method.
void inject(ServiceDownloaderPlayList service);
^
com.myproject.jointv.services.ServiceDownloaderPlayList.dataBaseHelper
[injected field of type: com.myproject.jointv.database.DataBaseHelper dataBaseHelper]
E:\AndroidProject\JoinTV\app\src\main\java\com\myproject\jointv\component\DataBaseComponent.java:18: error: com.myproject.jointv.api.WherePlaysAPI cannot be provided without an @
Provides- or @Produces-annotated method.
void inject(ServiceDownloaderPlayList service);
^
com.myproject.jointv.services.ServiceDownloaderPlayList.wherePlaysAPI
[injected field of type: com.myproject.jointv.api.WherePlaysAPI wherePlaysAPI]
Note: Start processing for 0 annotations on 0 elements
Note: Time measurements: [Whole Processing = 1 ms],
Note: Finish processing
5 errors
:app:compileDebugJavaWithJavac FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
There is my gradle app.
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:1.5.0'
classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
}
}
allprojects {
repositories {
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
And my gradle module
apply plugin: 'com.android.application'
apply plugin: 'com.neenbedankt.android-apt'
android {
compileSdkVersion 23
buildToolsVersion "23.0.2"
defaultConfig {
applicationId "com.myproject.jointv"
minSdkVersion 21
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
apt {
arguments {
androidManifestFile variant.outputs[0].processResources.manifestFile
resourcePackageName android.defaultConfig.applicationId
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.squareup.retrofit:retrofit:1.9.0'
compile 'com.android.support:recyclerview-v7:23.2.0'
compile 'com.android.support:leanback-v17:23.2.0'
compile 'com.android.support:appcompat-v7:23.2.0'
compile 'com.github.bumptech.glide:glide:3.4.+'
compile 'com.squareup.okhttp:okhttp:2.5.0'
compile 'com.squareup.okhttp:okhttp-urlconnection:2.5.0'
compile 'com.android.support:support-v4:23.2.0'
compile 'com.android.support:design:23.2.0'
compile 'com.danikula:videocache:2.3.3'
compile 'org.androidannotations:androidannotations-api:3.3.2'
apt 'org.androidannotations:androidannotations:3.3.2'
compile 'com.google.dagger:dagger:2.0.2'
apt 'com.google.dagger:dagger-compiler:2.0.2'
provided 'org.glassfish:javax.annotation:10.0-b28'
}
I was using the same configuration all day, but now I don't know where the problem could be and why it doesn't generate the components class.
ApiComponent.
@Singleton
@Component(modules = {
ApiModule.class,
DataBaseModule.class
})
public interface ApiComponent {
void inject(ServiceDownloaderPlayList service);
}
CacheComponent
@Singleton
@Component(modules = {
CacheModule.class
})
public interface CacheComponent {
void inject(VideoPlayerFragment fragment);
}
DataBaseComponent
@Singleton
@Component(modules = {
DataBaseModule.class
})
public interface DataBaseComponent {
void inject(ServiceDownloaderPlayList service);
}
Tips
When I comment the DataBaseComponent or ApiComponent everything work.
回答1:
if you are using apt plugin as following
classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8' apply plugin: 'com.neenbedankt.android-apt'
then include
apt "com.google.dagger:dagger-compiler:$DAGGER_VERSION"
along with
compile "com.google.dagger:dagger:$DAGGER_VERSION"
in module level build.gradle
Other than config issue Dagger2 will also fail to generate the Component classes if there is any error (most probably syntax error) in the dependent module or classes.
just open the dependent classes and fix the issue if any and re build the project .
Some invalidating cache also works : Android Studio->file->invalidate cache and Restart
回答2:
It's in your stacktrace error
E:\AndroidProject\JoinTV\app\src\main\java\com\myproject\jointv\component\ApiComponent.java:22: error: com.myproject.jointv.database.DataBaseHelper cannot be provided without an@Inject constructor or from an @Provides- or @Produces-annotated method.
void inject(ServiceDownloaderPlayList service);
Provide DataBaseHelper in a module.
来源：https://stackoverflow.com/questions/36050895/dagger-2-is-not-generating-my-component-class