从动态的观点认识一个按钮 [英] Recognizing a button from a dynamic view

问题描述

我写了这个code的动态布局，其中我使用这个循环，产生一对按钮（这是code，我生成它们的一部分）

I have written this code for a dynamic layout where I am using this loop to generate a pair of buttons (this is the part of code where I generate them)

  for(int i = 1; i <= 2 ; i++) {
        Button button1 = new Button(this);
        button1.setTag("age");
        button1.setId(i);
        layout.addView(button1);

        Button button2 = new Button(this);
        button2.setId(i);
        button2.setTag("country");
        button2.setEnabled(false);
        layout.addView(button2);

        button1.setOnClickListener(this);
        button2.setOnClickListener(this);
       }

我希望做的是，如果点击按钮1，按钮2应该得到启用（最初它被禁用）。

What I wish to do is if button1 is clicked, button2 should get enabled (initially it is disabled).

这将是一个非常容易的事，如果按钮是在XML创建为那么他们将不得不为每个单独R.id.xxxxx名字做的，但在这里我无法理解如何检测的OnClick另一个按钮（视图v）方法，如果启用与否，我试图添加标记为每个按钮，这样我还有另外一个参数来识别按钮，但我不知道如何与识别的其他按钮我可以改变鉴于点击按钮1的信息。

This would be a very easy task to do if the buttons were created in xml as then they will have separate R.id.xxxxx names for each, but here I am unable to understand how to detect the other button in the OnClick(View v) method so that I can change if it is enabled or not, I have tried to add the tag for each button so that I have another parameter to recognize the buttons but I have no idea how to recognize the other button with the view information of the clicked button1.

推荐答案

我假设你正在使用的按钮标签在点击处理。为了保持标签数据，并添加按钮之间的布线需要，您可以创建一个数据结构，将作为一个标记：

I assume that you are using the button tags in your click processing. To keep the tag data and add the needed wiring between buttons, you can create a data structure that would serve as a tag:

static class ButtonTag {
    String buttonType;
    Button partner;
    ButtonTag(String type, Button button) {
        buttonType = type;
        partner = button;
    }
}

然后，你可以重新组织设置code：

Then you could reorganize your setup code:

for(int i = 1; i <= 2 ; i++) {
    Button button1 = new Button(this);
    button1.setId(i);
    layout.addView(button1);

    Button button2 = new Button(this);
    button2.setId(i);
    button2.setEnabled(false);
    button1.setTag(new ButtonTag("age", button2));
    button2.setTag(new ButtonTag("country", button1));
    layout.addView(button2);
}

的点击处理显然需要改变投的 getTag（）到 ButtonTag 代替字符串。

如果你不需要的年龄和国家的信息来区分按钮类型，只需设置每个按钮为其他的标记。

If you don't need the "age" and "country" information to distinguish button types, just set each button as the tag for the other.

编辑：

对于后者方案中，这里是你将如何在点击监听器使用此：

With the latter scheme, here's how you would use this in a click listener:

public void onClick(View v) {
    Object tag = v.getTag();
    if (tag instanceof Button) {
        Button btn = (Button) tag;
        btn.setEnabled(true);
        v.setEnabled(false);
    }
}

如果您所需要的年龄和其他原因标签的国家的一部分，code将是只有一点点不同：

If you needed the "age" and "country" part of the tag for other reasons, the code would be only a little different:

public void onClick(View v) {
    Object tag = v.getTag();
    if (tag instanceof ButtonTag) {
        ButtonTag bTag = (ButtonTag) tag;
        bTag.partner.setEnabled(true);
        v.setEnabled(false);
    }
}

这篇关于从动态的观点认识一个按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！