小编kri*_*isk的帖子

我正试图从中获取"Home"文本

<li class="active"><a href="#">Home</a></li>

我试过了

element = self.browser.find_element_by_class_name('active')
print element.find_element_by_tag_name('a').text

但它返回空字符串.我在这里错过了什么？

试图了解所有RxJava的东西.我在做以下示例:

private Observable<List<String>> query1() {
    List<String> urls = new ArrayList<>();
    urls.add("1");
    urls.add("2");
    urls.add("3");
    urls.add("4");

    return Observable.just(urls);
}

private Observable<List<String>> query2() {
    List<String> urls = new ArrayList<>();
    urls.add("A");
    urls.add("B");
    urls.add("C");
    urls.add("D");

    return Observable.just(urls);
}

然后尝试加入两个列表:

 Observable.zip(
            query1(),
            query2(),
            new Func2<List<String>, List<String>, Observable<String>>() {
                @Override
                public Observable<String> call(List<String> a1, List<String> a2) {
                    List<String> list = new ArrayList<>();
                    list.addAll(a1);
                    list.addAll(a2);
                    return Observable.from(list);
                }
            })
            .subscribe(new Action1<String>() {  // <-- It says, cannot resolve method subscribe
                @Override
                public void call(String string) {
                    String text …

也许我在这里错过了,但在这里.让我说扩展Button

    public class MyButton extends Button {
        ...
        public MyButton(Context context, AttributeSet attrs) {
            super(context, attrs);
            ...
        }
    }

1. 如果MyButton在例如MyActivity中,我可以简单地将上下文转换为活动.
2. 现在,如果MyButton是MyDialog(扩展Dialog)的一部分,context.getClass()将指向ContextThemeWrapper,我无法获得活动.

那么如何在第二种情况下获得对话或活动的实例？

编辑 更多代码以更好地说明我想要做的事情:

public class MyDialog extends Dialog {
    private MyButton myButton;

    public MyDialog(Context context) {
        super(context)  

        this.setContentView(R.layout.my_dialog);
        this.setTitle("My Dialog");

        myButton = (MyButton) findViewById(R.id.my_button);
    }
}

public class MyButton extends Button implements Command {
    private MyActivity myActivity;

    public MyButton(Context context, AttributeSet attrs) {
        super(context, attrs);

        System.out.println(context instanceof ContextThemeWrapper); // TRUE
        System.out.println(context instanceof Activity); // FALSE

        myActivity = ??? // …