以编程方式创建的RadioGroup的奇怪行为 [英] Strange behaviour of programatically created RadioGroup

问题描述

我正在通过编程将 RadioButtons 添加到预先存在但为空的 RadioGroup 中，并使用以下代码。

I am programatically adding RadioButtons to a pre-existing but empty RadioGroup with the following code.

        RadioGroup currencySettingRadioGroup = (RadioGroup) currency_settings_dialog.findViewById(R.id.rg_currency_symbol);
        currencySettingRadioGroup.removeAllViews();

        RadioButton rb_none = new RadioButton(this);

        // Add the 'None' option at the start
        rb_none.setText("None");
        if (v_currency_symbol.equals("")) rb_none.setChecked(true);
        currencySettingRadioGroup.addView(rb_none,0);


        String[] currency_symbols_options_array = getResources().getStringArray(R.array.currency_symbols);
        for ( int i=0; i < currency_symbols_options_array.length; i++ ) {
            RadioButton rb = new RadioButton(this);
            rb.setText(currency_symbols_options_array[i]);
            if (v_currency_symbol.equals(currency_symbols_options_array[i].substring(0,1))) rb.setChecked(true);
            currencySettingRadioGroup.addView(rb,i+1);
        }

布局XML如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/currency_settings_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="12dp"
    android:paddingLeft="24dp"
    android:paddingRight="24dp"
    android:paddingTop="24dp">

    <TextView
        android:id="@+id/dialog_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/currency_symbol"
        android:textAppearance="@android:style/TextAppearance.DeviceDefault.DialogWindowTitle" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/currency_symbol_explanation" />

    <RadioGroup
        android:id="@+id/rg_currency_symbol"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">

    <Button
        android:id="@+id/settings_close_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/transparent"
        android:elevation="0dp"
        android:gravity="end|center_vertical"
        android:text="@string/close_currency_settings"
        android:textColor="#008dcd" />
</LinearLayout>

RadioGroup 的构建正确，并且 RadioButton 带有与我的 v_currency_symbol 变量的第一个字符匹配的文本，将按预期进行检查。

The RadioGroup gets built correctly and the RadioButton with the text that matches my v_currency_symbol variable's first character is checked as expected.

但是，单击其他任何 RadioButton s不会导致选中的选项取消选中-我最终选中了两个选项。

However, clicking any of the other RadioButtons does not cause the checked option to uncheck - I end up with two options checked.

单击并选中其他任何选项都会取消选中第二个选中的位置，但是第一个 RadioButton 保持选中状态。

Clicking and checking any of the other options causes the second checked position to uncheck, but the first RadioButtonremains checked.

以编程方式检查的 RadioButton 几乎就像是一个单独的RadioGroup。

It is almost as though the RadioButton that is checked programatically belongs to a seperate RadioGroup.

删除创建时检查 RadioButton 之一的两行，将允许 RadioGroup 正常运行，但是您显然看不到先前的选择。

Removing the two lines that check one of the RadioButtons on creation allows the RadioGroup to function properly, but you obviously cannot then see the previous selection.

推荐答案

我发现了问题...正在检查 RadioButton 之前将其添加到 RadioGroup 会导致问题。

I found the issue... checking the RadioButton before adding it to the RadioGroup causes the problem.

交换两个相关行即可解决此问题。工作代码如下：

Swapping the two relevant lines resolves the issue. The working code is as follows:

    // Add the 'None' option at the start
    rb_none.setText("None");
    currencySettingRadioGroup.addView(rb_none,0);
    if (v_currency_symbol.equals("")) rb_none.setChecked(true);


    String[] currency_symbols_options_array = getResources().getStringArray(R.array.currency_symbols);
    for ( int i=0; i < currency_symbols_options_array.length; i++ ) {
        RadioButton rb = new RadioButton(this);
        rb.setText(currency_symbols_options_array[i]);
        currencySettingRadioGroup.addView(rb,i+1);
        if (v_currency_symbol.equals(currency_symbols_options_array[i].substring(0,1))) rb.setChecked(true);
    }

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