Java 我能';t用匕首2将我的类注入我的视图持有者
我制作了一个PicturedDownloader来下载图像并将其设置到我的viewHolder中。所以我想在那个viewHolder中注入PictureDownloader的一个实例,但它总是空的,我找不到注入的错误。我还要做什么?我需要另一个模块?我必须注射这个视窗支架 我带来了所有这些课程: 应用组件:Java 我能';t用匕首2将我的类注入我的视图持有者,java,android,dagger-2,android-viewholder,dagger,Java,Android,Dagger 2,Android Viewholder,Dagger,我制作了一个PicturedDownloader来下载图像并将其设置到我的viewHolder中。所以我想在那个viewHolder中注入PictureDownloader的一个实例,但它总是空的,我找不到注入的错误。我还要做什么?我需要另一个模块?我必须注射这个视窗支架 我带来了所有这些课程: 应用组件: @Singleton @Component(modules = {ActivityBindingModule.class, AppModule.class, PictureD
@Singleton
@Component(modules = {ActivityBindingModule.class,
AppModule.class,
PictureDownloaderModule.class,
AndroidSupportInjectionModule.class})
public interface AppComponent extends AndroidInjector<MarvelApplication> {
PictureDownloader getPictureDownloader();
@Component.Builder
interface Builder {
@BindsInstance
AppComponent.Builder application(Application application);
AppComponent build();
}
}
PicturedDownLoader:
@Singleton
public class PictureDownloader {
private CacheImageHandler mCacheHandler;
@Inject
public PictureDownloader(CacheImageHandler cacheHandler) {
this.mCacheHandler = cacheHandler;
}
public void download(String url, ImageView imageView) {
if (url == null) {
return;
}
if (imageView == null) {
return;
}
// resetPurgeTimer();
Bitmap bitmap = mCacheHandler.getBitmapFromCache(url);
....
CacheMageHandler:
@Singleton
public class CacheImageHandler {
private Context mContext;
private SoftImageCache mSoftCache;
@Inject
public CacheImageHandler(Context context) {
mContext = context;
int memClass = ( (ActivityManager) mContext.getSystemService( Context.ACTIVITY_SERVICE ) ).getMemoryClass();
int cacheSize = 1024 * 1024 * memClass;
mSoftCache = new SoftImageCache(cacheSize);
}
// Save Bitmap to CacheDir and save it on softCache
public void saveBitmapToCache(String key, Bitmap bitmap) {
if (bitmap != null) {
...
HomeListViewHolder:
public class HomeListViewHolder extends RecyclerView.ViewHolder {
@Inject
PictureDownloader mPictureDownloader;
@BindView(R.id.image_character)
ImageView mImageView;
private View mItemView;
private HomeListListener mListener;
public HomeListViewHolder(View itemView, final HomeListListener listener) {
super(itemView);
ButterKnife.bind(this, itemView);
this.mItemView = itemView;
this.mListener = listener;
}
public void bindModel(final CharacterModel character) {
mPictureDownloader.download(
"https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/shiny/",
mImageView);
mItemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (mListener != null) {
mListener.onCharacterClick(character);
}
}
});
}
我的申请:
public class MarvelApplication extends DaggerApplication {
@Inject
PictureDownloader mPictureDownloader;
@Override
protected AndroidInjector<? extends DaggerApplication> applicationInjector() {
return DaggerAppComponent.builder().application(this).build();
}
public PictureDownloader getPictureDownloader(){
return mPictureDownloader;
}
}
公共类应用程序扩展DaggerApplication{
@注入
图片下载器MPICUTREDOWNLOADER;
@凌驾
受保护的Androidjector您的viewholder不是dagger graph的一部分,您应该通过viewholder构造函数传递donwloader引用,而不是从dagger graph的一部分实例传递
public class HomeListViewHolder extends RecyclerView.ViewHolder {
PictureDownloader mPictureDownloader;
@BindView(R.id.image_character)
ImageView mImageView;
private View mItemView;
private HomeListListener mListener;
public HomeListViewHolder(View itemView, final HomeListListener listener, final PictureDownloader pictureDownloader) {
super(itemView);
mPictureDownloader = pictureDownloader;
ButterKnife.bind(this, itemView);
this.mItemView = itemView;
this.mListener = listener;
}
...
顺便说一下,您可以删除这些:
public interface AppComponent extends AndroidInjector<MarvelApplication> {
// PictureDownloader getPictureDownloader(); <-- useless
...
}
@Module
public class PictureDownloaderModule {
@Provides
@Singleton
CacheImageHandler providesCacheImageHandler(Context context) {
return new CacheImageHandler(context);
}
// !!! Useless already added to the graph through constructor injection
/*@Singleton
PictureDownloader providesPictureDownloader(CacheImageHandler cacheImageHandler) {
return new PictureDownloader(cacheImageHandler);
}*/
}
公共接口AppComponent扩展了AndroidJector{
//PictureDownloader getPictureDownloader();您的viewholder不是dagger图的一部分,您应该通过viewholder构造函数而不是从dagger图的一部分的实例传递donwloader引用
public class HomeListViewHolder extends RecyclerView.ViewHolder {
PictureDownloader mPictureDownloader;
@BindView(R.id.image_character)
ImageView mImageView;
private View mItemView;
private HomeListListener mListener;
public HomeListViewHolder(View itemView, final HomeListListener listener, final PictureDownloader pictureDownloader) {
super(itemView);
mPictureDownloader = pictureDownloader;
ButterKnife.bind(this, itemView);
this.mItemView = itemView;
this.mListener = listener;
}
...
顺便说一下,您可以删除这些:
public interface AppComponent extends AndroidInjector<MarvelApplication> {
// PictureDownloader getPictureDownloader(); <-- useless
...
}
@Module
public class PictureDownloaderModule {
@Provides
@Singleton
CacheImageHandler providesCacheImageHandler(Context context) {
return new CacheImageHandler(context);
}
// !!! Useless already added to the graph through constructor injection
/*@Singleton
PictureDownloader providesPictureDownloader(CacheImageHandler cacheImageHandler) {
return new PictureDownloader(cacheImageHandler);
}*/
}
公共接口AppComponent扩展了AndroidJector{
//PicturedDownLoader GetPicturedDownLoader();请。您既不进行构造函数注入,也不进行字段注入,您可以删除所有的@Inject
,而不是MarvelApplication
中的一个。请仔细阅读并确保了解何时以及如何使用@Inject
谢谢我已经阅读了链接,但我看到它的唯一方法是工作正在注入该类(PicturedDownLoader)进入我的片段,并将其传递到适配器的构造函数中,然后再传递到我的ViewHolder的构造函数中。还有其他方法吗?请。您既不进行构造函数注入,也不进行字段注入,您可以删除所有的@Inject
,而不是MarvelApplication
中的单个构造函数。请阅读carefu请仔细阅读并确保理解何时以及如何使用@Inject
谢谢我已经阅读了链接,但我认为它将起作用的唯一方法是注入该类(PictureDownloader)进入我的片段并将其传递到我的适配器的构造函数中,然后传递到我的ViewHolder的构造函数中。还有其他方法吗?因此我必须从片段中注入PicturedDownLoader并将此对象传递到我的适配器的构造函数中,然后再传递到我的ViewHolder的构造函数中?或者还有其他方法吗?谢谢r您的帮助!是的,您通常不注入视图/视图持有者(如果您从dagger github进行搜索,则不建议这样做,尽管可以这样做或这样做),而是从控制器传递注入的依赖项(片段/活动/…)因此我必须从片段中注入PicturedDownloader,并将此对象传递到适配器的构造函数和ViewHolder的构造函数中?或者有其他方法吗?感谢您的帮助!是的,您通常不注入view/ViewHolder(如果您从dagger github进行搜索,则不建议这样做,尽管可以这样做或这样做),您可以将注入的依赖项从控制器(fragment/activity/…)传递到视图