单选按钮选择在Android上改变吐司 [英] Radio Button selection Changes Toast on Android

问题描述

我在写一个简单的测试应用程序。有应用程序中的两个单选按钮。有ID是radio_red和radio_blue。我想创造一个onClickListener事件读取相关的按钮上的文本，然后返回一个基本的正确或错误的面包。

I was writing a simple test application. There are two radio buttons within the app. There id's are "radio_red" and "radio_blue". I wanted to create an onClickListener event that read the text associated to the button and then returned a basic "Right" or "Wrong" toast.

这里是code的例子：

Here is a sample of the code:

private OnClickListener radio_listener = new OnClickListener() {
    public void onClick(View v){
        RadioButton rb = (RadioButton) v;
        String ans =  rb.getText().toString();
        String an1 = "";

        if (ans.trim() == "Yes") {
            ans = "That's Right.";
        }
            else if (ans.trim() == "No") {
                ans = "thats wrong.";
            }
            else {
                ans = "none.";
            }

        Toast.makeText(v.getContext(), ans , Toast.LENGTH_SHORT).show();
    }

到目前为止，没有喜悦。这是我的code段。我检查了我的main.xml中和相关的按钮上的文本正确referneced。我加修剪，以确保这一点。然而，所有这一切都在不断敬酒返回是无。我在想什么？感谢您事先的任何帮助。

So far no joy. Here is my code snippet. I've checked my "main.xml" and the text associated to the buttons are referneced correctly. I added trim to make sure of that. However, all that is ever returned in the toast is "none." What am I missing? Thanks in advance for any help.

推荐答案

您要处理的<一个href="http://developer.android.com/intl/fr/reference/android/widget/RadioGroup.html"><$c$c>RadioGroup,不是单选。该 RadioGroup中可以告诉你有关无线电管制，喜欢哪一个被选中的更多元的细节。例如，在你的听众，你应该使用<一个href="http://developer.android.com/intl/fr/reference/android/widget/RadioGroup.html#getCheckedRadioButtonId%28%29"><$c$c>RadioGroup.getCheckedRadioButtonId().

You want to deal with the RadioGroup, not the RadioButton. The RadioGroup can tell you more meta-details about the radio controls, like which one is checked. For example, in your listener you should use RadioGroup.getCheckedRadioButtonId().

另外，你可以添加一个监听到RadioGroup中本身设置一个切换的背景下，使用<一个href="http://developer.android.com/intl/fr/reference/android/widget/RadioGroup.html#setOnCheckedChangeListener%28android.widget.RadioGroup.OnCheckedChangeListener%29"><$c$c>RadioGroup.setOnCheckedChangeListener().它告诉你哪个单选是pressed的能力。

Alternatively, you could add a listener to the RadioGroup itself that sets a toggle in the background, using RadioGroup.setOnCheckedChangeListener(). It has the capability of telling you which RadioButton was pressed.

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