如何从列表同步可观察对象

Question

我想对列表的每一项执行操作符。当前一项的操作完成时，应该触发列表的下一项。此时(见代码)，对所有并行项执行运算符。如何避免并行处理?

List<String> strings = new ArrayList<>(3);
    strings.add("String1");
    strings.add("String2");
    strings.add("String3");
    Observable<String> stringObservables = Observable.from(strings);
    stringObservables
            .subscribeOn(Schedulers.newThread())
            .observeOn(AndroidSchedulers.mainThread())
            .lift(new TranslateViewOperator( ... parameters ... ))
            .subscribe();

操作符定义如下:

public class TranslateViewOperator implements Observable.Operator<View, View> {
long         duration;
Interpolator interpolator;
int          runningAnimations;
float        xTransform;
public TranslateViewOperator(float xTransform, long duration, Interpolator interpolator) {
    super();
    this.duration = duration;
    this.interpolator = interpolator;
    this.xTransform = xTransform;
}
@Override
public Subscriber<? super View> call(final Subscriber<? super View> subscriber) {
    return new Subscriber<View>() {
        @Override
        public void onCompleted() {
        }
        @Override
        public void onError(Throwable e) {
        }
        @Override
        public void onNext(View view) {
            runningAnimations++;
            System.out.println("TranslateViewOperator.onNext");
            ViewCompat.animate(view)
                      .translationX(xTransform - runningAnimations)
                      .scaleX(1f)
                      .scaleY(1f)
                      .setStartDelay(1000)
                      .setDuration(1000)
                      .setInterpolator(interpolator)
                      .withEndAction(() -> {
                          System.out.println("Animation finished");
                      });
        }
    };
}

}

println输出如下:

TranslateViewOperator.onNext
TranslateViewOperator.onNext
TranslateViewOperator.onNext
Animation finished
Animation finished
Animation finished

这意味着首先所有动画都在这里开始。但是我想在上一个动画完成后开始下一个动画

Answer 1

您正在寻找绑定。bindContent (list1用于);

在JavaFX中可用。

生成{@link javafx.collections之间的内容绑定。{@link java.util.List}.

如果{@code ObservableList}的内容发生了变化，{@code List}也会自动更新。