Component Application
/ \
Subcomponent DrawerActivity Subcomponent SubActivity
|
Subcomponent DrawerFragment
在SubActivity和DrawerActivity中,我使用标記為@Singleton的相同存儲庫執行個體.
@Singleton
@Component(modules = {
AndroidInjectionModule.class,
AppModule.class,
ActivityBuilderModule.class
})
public interface AppComponent {
@Component.Builder
interface Builder{
@BindsInstance Builder application(Application application);
AppComponent build();
}
void inject(App app);
}
@Module
public abstract class ActivityBuilderModule {
@PerActivity
@ContributesAndroidInjector(modules = {DrawerActivityModule.class,
FragmentBuilderModule.class})
abstract DrawerActivity bindDrawerActivity();
@PerActivity
@ContributesAndroidInjector(modules = {DrawerActivityModule.class})
abstract SubActivity bindSubActivity();
}
@Module
public abstract class FragmentBuilderModule {
@PerFragment
@ContributesAndroidInjector(modules = DrawerFragmentModule.class)
abstract DrawerFragment provideDrawerFragment();
}
@Singleton
public class Repository{
private SomeClass mSomeClass;
@Inject
public VehicleRepositoryImpl(SomeClass someClass) {
mSomeClass = someClass;
}
}
public class App extends Application implements HasActivityInjector{
@Inject
DispatchingAndroidInjector dispatchingAndroidInjector;
@Override
public void onCreate() {
super.onCreate();
if (BuildConfig.DEBUG) {
Timber.plant(new Timber.DebugTree());
}
AppComponent component = DaggerAppComponent.builder().application(this)
.build();
component.inject(this);
}
@Override
public AndroidInjector activityInjector() {
return dispatchingAndroidInjector;
}
}
public class DrawerActivity extends AppCompatActivity implements HasSupportFragmentInjector{
@Inject
DispatchingAndroidInjector fragmentDispatchingAndroidInjector;
@Override
public AndroidInjector supportFragmentInjector() {
return fragmentDispatchingAndroidInjector;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
AndroidInjection.inject(this);
super.onCreate(savedInstanceState);
}
}
public class DrawerFragment extends Fragment {
@Inject
ViewModelFactory mViewModelFactory; //repository gets injected into factory
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
AndroidSupportInjection.inject(this);
super.onCreate(savedInstanceState);
}
}
public class SubActivity extends AppCompatActivity{
@Inject
Repository mRepository;
@Override
protected void onCreate(Bundle savedInstanceState) {
AndroidInjection.inject(this);
super.onCreate(savedInstanceState);
}
}
我現在需要添加使用者管理.這需要LoginActivity.我不希望存儲庫在LoginActivity中可用.是以我想為DrawerActivity / Subactivity / DrawerFragement建立一個本地單例範圍“UserScope”
Component Application
/ \
@UserScope @LoginScope
Subcomponent DrawerActivity SubComponent LoginActivity
| \
Subcomponent DrawerFragment Subcomponent SubActivity
如何使用新的@ContributesAndroidInjector注釋實作此目的？
解決方法:
我在這個回購中解決了我的問題：
非常感謝它的貢獻者！
更新1：添加了代碼示例.
該圖提供了代碼示例的粗略概念.
Component Application
/ \
@UserScope @LoginScope
Subcomponent UserComponent SubComponent LoginActivity
| \
Subcomponent DrawerActivity Subcomponent SubActivity
|
SubComponent DrawerFragment
代碼示例(如果缺少某些内容請在評論中告訴我)：
1.匕首設定
AppComponent是Dagger圖的根：
@Singleton
@Component(modules = {
AndroidSupportInjectionModule.class,
AppModule.class,
AppBindingModule.class
})
public interface AppComponent extends AndroidInjector {
@Component.Builder
interface Builder{
@BindsInstance Builder application(Application application);
AppComponent build();
}
void inject(MyApp app);
UserComponent.Builder userBuilder();
UserManager getUserManager();
}
綁定其子元件的子產品：
@Module(subcomponents = UserComponent.class)
public abstract class AppBindingModule {
@ContributesAndroidInjector(modules = LoginModule.class)
@LoginScope
abstract LoginActivity loginActivity();
}
UserComponent儲存僅在使用者登入時使用的類的執行個體.UserModule.class中提供的所有類在其他子元件(如活動和片段元件)中可用作“LocalSingletons”.
@UserScope
@Subcomponent(modules = {
UserBindingModule.class,
UserModule.class,
AndroidSupportInjectionModule.class
})
public interface UserComponent extends AndroidInjector {
void inject(UserManager userManager);
@Subcomponent.Builder
interface Builder{
UserComponent build();
}
}
UserBindingModule定義哪些活動子元件屬于UserComponent.
@Module
public abstract class UserBindingModule {
@ContributesAndroidInjector(modules = {DrawerBindingModule.class, AndroidSupportInjectionModule.class})
abstract DrawerActivity bindDrawerActivity();
@ContributesAndroidInjector
abstract SubActivity bindSubActivity();
}
DrawerBindingModule定義哪些片段子元件屬于DrawerActivityComponent.
@Module
public abstract class DrawerBindingModule {
@DrawerFragmentScope
@ContributesAndroidInjector(modules = DrawerFragmentModule.class)
abstract DrawerFragment provideDrawerFragment();
}
UserManager處理使用者登入/登出以及所有進一步的活動注入.
@Singleton
public class UserManager implements HasActivityInjector {
private final UserComponent.Builder userComponentBuilder;
@Inject
DispatchingAndroidInjector activityInjector;
private UserComponent userComponent;
@Inject
public UserManager(UserComponent.Builder builder) {
this.userComponentBuilder = builder;
}
public void logIn(){
createUserSession();
}
private void createUserSession() {
userComponent = userComponentBuilder.build();
userComponent.inject(this);
}
public boolean isLoggedIn() {
return userComponent != null;
}
public void logOut() {
userComponent = null;
}
@Override
public AndroidInjector activityInjector() {
return activityInjector;
}
}
2. App Activity Fragment類
public class MyApp extends Application implements HasActivityInjector{
@Inject
DispatchingAndroidInjector dispatchingAndroidInjector;
@Inject
UserManager mUserManager;
@Override
public void onCreate() {
super.onCreate();
if (BuildConfig.DEBUG) {
Timber.plant(new Timber.DebugTree());
}
AppComponent component = DaggerAppComponent.builder().application(this)
.build();
component.inject(this);
}
@Override
public AndroidInjector activityInjector() {
return mUserManager.activityInjector();
}
}
public class LoginActivity extends AppCompatActivity {
Intent mOpenDrawerActivity;
private ActivityLoginBinding binding;
@Inject
UserManager mUserManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
AndroidInjection.inject(this);
super.onCreate(savedInstanceState);
...
}
void openDrawerActivity(){
mUserManager.logIn();
mOpenDrawerActivity = new Intent(this, DrawerActivity.class);
startActivity(mOpenDrawerActivity);
finish();
}
}
public class DrawerActivity extends BaseUserActivity implements HasSupportFragmentInjector{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
}
private void onLogout(){
logoutUser();
}
}
public abstract class BaseUserActivity extends BaseActivity {
@Inject
UserManager userManager;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (!userManager.isLoggedIn()) {
finishView();
}
}
@Override
protected void androidInject() {
AndroidInjection.inject(this);
}
protected void logoutUser() {
userManager.logOut();
finishView();
}
}
public abstract class BaseActivity extends AppCompatActivity implements HasSupportFragmentInjector {
@Inject
DispatchingAndroidInjector injector;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
androidInject();
super.onCreate(savedInstanceState);
}
protected void androidInject() {
AndroidInjection.inject(this);
}
public void finishView() {
startActivity(new Intent(this, LoginActivity.class));
finish();
}
@Override
public AndroidInjector supportFragmentInjector() {
return injector;
}
}
标簽：java,android,dagger-2
來源： https://codeday.me/bug/20190622/1263693.html