Queue actions send to the view until it is attached

[passsy]

Sending events to the view although the view isn't attached is already possible with rx and .compose(rxUtils.deliverLatestCacheToView(this)) which caches all items until the view is attached and emits them in the same order. The same behavior is now back ported to pure java.

Usecase: Building a splashscreen which should make a network call and then forward to a new Activity.

• It should not start the activity when the app was closed in the meantime
• It should start the new activity when the app comes to the foreground and the network call already finished

The network call is started in TiPresenter#onCreate(). The call can return at any time.

• Before the view is attached when a cached result is returned.
• When the view is attached.
• When the user left the screen and the view is detached.

The call view.goToMain() will only be sent once to the view when the activity is open (view is attached) after the network call finished. There will be no NPE because the view is null.

// SplashscreenPresenter
@Override
protected void onCreate() {
    super.onCreate();
    doNetworkCall(result -> {
        handleResult(result);
        sendToView(view -> view.goToMain());
    });
}

// SplashscreenActivity
@Override
public void goToMain() {
    startActivity(new Intent(this, MainActivity.class));
    finish();
}

[oleksandrbogdanov]

The storing of results logic is clear, and tests is passed I would approve it. Do not have permissions to merge.