[英]Dagger2 how to use constructor injection
I've read more about Dagger2 and I find that is similar to Butterknife
, because when I need to use it I create a module, and use: 我已经阅读了有关Dagger2的更多信息,并且发现它类似于Butterknife
,因为当我需要使用它时,我创建了一个模块,并使用:
((MyApp) getApplication()).createAppComponent().inject(this);
to use, for example, this: 使用例如:
@Inject
RegisterPresenter presenter;
but I don't understand how to use constructor injection. 但我不明白如何使用构造函数注入。 I've a case(use model-view-presenter): 我有一个案例(使用model-view-presenter):
private Register.View view;
private RegisterModel model;
private StorageModel storageModel;
private DatabaseModel databaseModel;
private Uri compressPath;
List<String > stringList;
String uid;
@Inject
public RegisterPresenter() {
model = new RegisterModel(this);
storageModel = new StorageModel(this);
databaseModel = new DatabaseModel(this);
}
is it correct? 这是正确的吗? Or I need to do it? 还是我需要这样做?
@Inject
public RegisterPresenter(RegisterModel model, StorageModel storageModel, DatabaseModel databaseModel) {
this.model = model;
this.storageModel = storageModel;
this.databaseModel = databaseModel;
}
because if I use the second code, in my activity(View) I need to do it: 因为如果我使用第二个代码,那么我需要在activity(View)中执行以下操作:
protected void onResume() {
super.onResume();
presenter.setView(this);
}
so how could construct the Presenter? 那么如何构造演示者? Or if I need to create this in Activity, is it correct to pass the module from the view? 或者,如果我需要在“活动”中创建此对象,从视图中传递模块是否正确?
EDIT: these are my models: 编辑:这些是我的模型:
public class FirebaseModel implements Model, FirebaseAuth.AuthStateListener {
FirebaseAuth auth;
Presenter presenter;
FirebaseUser user;
@Inject
public FirebaseModel(Presenter presenter) {
this.presenter = presenter;
auth = FirebaseAuth.getInstance();
}
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
user = auth.getCurrentUser();
presenter.updateUser(user);
}
@Override
public void loadUser() {
auth.addAuthStateListener(this);
}
}
public class StorageModel implements Register.Storage,OnCompleteListener <UploadTask.TaskSnapshot>{
Register.Presenter presenter;
StorageReference storage;
@Inject
public StorageModel(Register.Presenter presenter) {
this.presenter = presenter;
storage = FirebaseStorage.getInstance().getReferenceFromUrl("gs://firebase-happypark.appspot.com");
}
@Override
public void onTryToUpdateUser(Uri path,String uid) {
if(path != null) {
StorageReference riversRef = storage.child("uid").child("ImgProfile/" + path.getLastPathSegment());
UploadTask uploadTask = riversRef.putFile(path);
Log.d("ssd", "sto qua");
uploadTask.addOnCompleteListener(this);
}
}
//UNNECESSARY
@Override
public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> task) {
if (task.isSuccessful()) {
presenter.onUploadCompleted();
} else {
presenter.onUploadError(task.getException());
}
}
} }
Thank you 谢谢
Presenter would be something like this: 演示者将是这样的:
public class RegisterPresenter implements RegisterContract.Presenter {
private Register.View view;
private RegisterModel model;
private StorageModel storageModel;
private DatabaseModel databaseModel;
private Uri compressPath;
List<String > stringList;
String uid;
@Inject
public RegisterPresenter(Register.View view, RegisterModel model, StorageModel storageModel, DatabaseModel databaseModel) {
this.view = view;
this.model = model;
this.storageModel = storageModel;
this.databaseModel = databaseModel;
}
@Override
public void someMethodFromContract(){}
//or anything else you have in mind
}
And then call it in onResume like this 然后像这样在onResume中调用它
presenter.someMethodFromContract();
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