我們沒有必要爲開始,到目前爲止停止,但有依賴暫停的幾個景點並恢復。我們按照您的建議使用ActivityPresenter,但避免使用任何通用超類。相反,它會公開一個感興趣的演示者可以選擇參加的服務。這種連接需求是爲什麼添加了onEnterScope(Scope)方法。這是代碼。
首先,有活動實現這個接口:
/**
* Implemented by {@link android.app.Activity} instances whose pause/resume state
* is to be shared. The activity must call {@link PauseAndResumePresenter#activityPaused()}
* and {@link PauseAndResumePresenter#activityResumed()} at the obvious times.
*/
public interface PauseAndResumeActivity {
boolean isRunning();
MortarScope getMortarScope();
}
,並將它注入了演講並進行相應的電話:
private boolean resumed;
@Inject PauseAndResumePresenter pauseNarcPresenter;
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
pauseNarcPresenter.takeView(this);
}
@Override public boolean isRunning() {
return resumed;
}
@Override protected void onResume() {
super.onResume();
resumed = true;
pauseNarcPresenter.activityResumed();
}
@Override protected void onPause() {
resumed = false;
super.onPause();
pauseNarcPresenter.activityPaused();
}
@Override protected void onDestroy() {
pauseNarcPresenter.dropView(this);
super.onDestroy();
}
現在,有關各方可以注入註冊商接口OPT-暫停和恢復調用,不需要繼承任何東西。
/**
* Provides means to listen for {@link android.app.Activity#onPause()} and {@link
* android.app.Activity#onResume()}.
*/
public interface PauseAndResumeRegistrar {
/**
* <p>Registers a {@link PausesAndResumes} client for the duration of the given {@link
* MortarScope}. This method is debounced, redundant calls are safe.
*
* <p>Calls {@link PausesAndResumes#onResume()} immediately if the host {@link
* android.app.Activity} is currently running.
*/
void register(MortarScope scope, PausesAndResumes listener);
/** Returns {@code true} if called between resume and pause. {@code false} otherwise. */
boolean isRunning();
}
已在客戶端演示實現這個接口:
/**
* <p>Implemented by objects that need to know when the {@link android.app.Activity} pauses
* and resumes. Sign up for service via {@link PauseAndResumeRegistrar#register(PausesAndResumes)}.
*
* <p>Registered objects will also be subscribed to the {@link com.squareup.otto.OttoBus}
* only while the activity is running.
*/
public interface PausesAndResumes {
void onResume();
void onPause();
}
和掛鉤事情是這樣的。 (請注意,不需要取消註冊。)
private final PauseAndResumeRegistrar pauseAndResumeRegistrar;
@Inject
public Presenter(PauseAndResumeRegistrar pauseAndResumeRegistrar) {
this.pauseAndResumeRegistrar = pauseAndResumeRegistrar;
}
@Override protected void onEnterScope(MortarScope scope) {
pauseAndResumeRegistrar.register(scope, this);
}
@Override public void onResume() {
}
@Override public void onPause() {
}
下面是活動注入以使其全部正常工作的主持人。
/**
* Presenter to be registered by the {@link PauseAndResumeActivity}.
*/
public class PauseAndResumePresenter extends Presenter<PauseAndResumeActivity>
implements PauseAndResumeRegistrar {
private final Set<Registration> registrations = new HashSet<>();
PauseAndResumePresenter() {
}
@Override protected MortarScope extractScope(PauseAndResumeActivity view) {
return view.getMortarScope();
}
@Override public void onExitScope() {
registrations.clear();
}
@Override public void register(MortarScope scope, PausesAndResumes listener) {
Registration registration = new Registration(listener);
scope.register(registration);
boolean added = registrations.add(registration);
if (added && isRunning()) {
listener.onResume();
}
}
@Override public boolean isRunning() {
return getView() != null && getView().isRunning();
}
public void activityPaused() {
for (Registration registration : registrations) {
registration.registrant.onPause();
}
}
public void activityResumed() {
for (Registration registration : registrations) {
registration.registrant.onResume();
}
}
private class Registration implements Scoped {
final PausesAndResumes registrant;
private Registration(PausesAndResumes registrant) {
this.registrant = registrant;
}
@Override public void onEnterScope(MortarScope scope) {
}
@Override public void onExitScope() {
registrations.remove(this);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Registration that = (Registration) o;
return registrant.equals(that.registrant);
}
@Override
public int hashCode() {
return registrant.hashCode();
}
}
}
在https:/ /github.com/square/mortar/issues/97#issuecomment-50798195我們討論瞭如果活動範圍結束時活動正在運行,PauseAndResumePresenter如何調用註冊者的onPause方法是一個好主意。我還沒有更新代碼來做到這一點。 – rjrjr