如何将单选按钮添加到单选组

问题描述

我有一个 TableLayout，我想在每一行的第三列放置一个单选组.我像这样构建 RadioButtons:

I have a TableLayout and in the third column of every row I want to place a radio group.I build the RadioButtons like this:

rg = (RadioGroup) findViewById(R.id.radioGroup1);

for (int k = 0; k < size; k++) {
    rb[k] = new RadioButton(context);
    rg.addView(rb[k]);
}

但是这会导致我的应用崩溃，有什么想法吗?

However this cause my app to crash, any ideas?

推荐答案

你正在构建一个长度为 megethos 的原始数组，但你的循环使用长度 size.如果 megethos 和 size 是不同的值，这可能会导致许多不同类型的错误......但是所有这些都是多余的，因为 RadioGroup 会为您保持这个数组是最新的.

You are building a primitive array with the length of megethos, but your loop uses the length size. If megethos and size are different values this can cause many different types of errors... But all of this redundant since a RadioGroup keeps this array up to date for you.

我会尝试这样的:

RadioGroup group = (RadioGroup) findViewById(R.id.radioGroup1);
RadioButton button;
for(int i = 0; i < 3; i++) {
    button = new RadioButton(this);
    button.setText("Button " + i);
    group.addView(button);
}

当你想在 index 引用一个按钮时:

And when you want to reference a button at index:

group.getChildAt(index);

另外，请始终发布您的 logcat 错误，它确切地告诉我们出了什么问题以及在哪里查看.否则我们只能这样猜测.

Also please always post your logcat errors, it tells us exactly what went wrong and where to look. Otherwise we have to guess like this.

更新

错误是因为您试图将同一个按钮添加到两个不同的布局中:

The error is because you are trying to add the same button to two different layouts:

tr[k].addView(rb[k]);
rg.addView(rb[k]);

一个视图只能有一个父视图.据我所知，如果没有首先进行大量定制，您无法将 RadioGroup 拆分为多个视图.然而，ListView 已经具有类似于 RadioGroup 的内置功能 setChoiceMode():

a view can only have one parent. As far as I know you cannot break a RadioGroup apart into multiple views without a lot of customization first. However a ListView already has the built-in feature setChoiceMode() that behaves like a RadioGroup:

List<String> list = new ArrayList<String>();
list.add("one");
list.add("two");
list.add("three");

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_checked, list);
ListView listView = (ListView) findViewById(R.id.list);
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
listView.setAdapter(adapter);

您可以轻松调整 simple_list_item_checked 以显示 SSID 和信号强度.希望有帮助.(如果您等待足够长的时间，imran khan 可能会通过图形更改剪切并粘贴我的答案，然后再次将其声明为他自己的.)

You can easily adapt simple_list_item_checked to display the SSID and signal strength. Hope that helps. (If you wait long enough imran khan might cut & paste my answer with graphical change, then claim it as his own again.)

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