blocks|key|398337|text|如果您的单选按钮组是在布局xml文件中定义的，则可以为每个按钮分配一个id。然后你只需像这样勾选一个按钮|type|unstyled|depth|inlineStyleRanges|entityRanges|data|398338|radioGroup.check(R.id.myButtonId);|code-block|syntax|javascript|398339|如果您以编程方式创建了您的单选按钮组(我甚至不确定您是如何做到这一点的…)，您可能想要考虑为单选按钮组创建一个特殊的布局xml文件，以便您可以将R.id.*+ids分配给按钮。|398340|请参阅下面的答案如果您实际上正在寻找按索引设置单选按钮，请参阅下面的答案。|398341|((RadioButton)radioGroup.getChildAt(index)).setChecked(true);|398342|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

If your radio group is defined in a layout xml file, each button can be assigned an id. Then you just check a button like this

<pre><code>radioGroup.check(R.id.myButtonId);
</code></pre>

If you created your radio group programmatically (I'm not even sure how you do this...), you might want to consider creating a special layout xml file just for the radio group so that you can assign R.id.* ids to the buttons.

Please see the answer below if you are, in fact, looking to set the radio button group by index, see the answer below.

<pre><code>((RadioButton)radioGroup.getChildAt(index)).setChecked(true);
</code></pre>

blocks|key|398415|text|问题是“设置选定的索引”，这里是如何通过索引来设置的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|398416|((RadioButton)radioGroup.getChildAt(index)).setChecked(true);|code-block|syntax|javascript|398417|.|398418|补充信息:谷歌似乎希望你使用id而不是index，因为使用id可以更好地防止bug。例如，如果您的RadioGroup中有另一个UI元素，或者如果另一个开发人员对RadioButtons进行了重新排序，那么索引可能会发生变化，而不是您所期望的结果。但是如果你是唯一的开发者，这是完全没问题的。|398419|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Question said "set selected INDEX", here's how to set it by index:

<pre><code>((RadioButton)radioGroup.getChildAt(index)).setChecked(true);
</code></pre>

........

Additional info: It seems that Google wants you to use id instead of index, because using id is more bug proof. For example, if you have another UI element in your RadioGroup, or if another developer re-orders the RadioButtons, the indices might change and not be what you expected. But if you're the only developer, this is totally fine.

blocks|key|614447|text|你可以在广播组里做findViewById。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|614448|((RadioButton)my_radio_group.findViewById(R.id.radiobtn_veg)).setChecked(true);`|code-block|syntax|javascript|614449|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

you can do findViewById from the radio group .

<pre><code>((RadioButton)my_radio_group.findViewById(R.id.radiobtn_veg)).setChecked(true);`
</code></pre>

blocks|key|398558|text|Siavash的答案是正确的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|398559|((RadioButton)radioGroup.getChildAt(index)).setChecked(true);|code-block|syntax|javascript|398560|但请注意，radioGroup可以包含radioButtons以外的视图--就像本例中在每个选项下都包含一条模糊的线一样。|398561|<RadioGroup
++++android:id="@%2Bid/radioKb"
++++android:layout_width="wrap_content"
++++android:layout_height="wrap_content"+>

++++<RadioButton
++++++++android:id="@%2Bid/kb1"
++++++++android:layout_width="fill_parent"
++++++++android:layout_height="wrap_content"
++++++++android:textAppearance="?android:attr/textAppearanceLarge"
++++++++android:button="@null"
++++++++android:drawableRight="@android:drawable/btn_radio"
++++++++android:text="Onscreen+-+ABC"+/>

++++<View
++++++++android:layout_width="fill_parent"
++++++++android:layout_height="1dp"
++++++++android:background="#33000000"+/>

++++<RadioButton
++++++++android:id="@%2Bid/kb2"
++++++++android:layout_width="fill_parent"
++++++++android:layout_height="wrap_content"
++++++++android:textAppearance="?android:attr/textAppearanceLarge"
++++++++android:button="@null"
++++++++android:drawableRight="@android:drawable/btn_radio"
++++++++android:text="Onscreen+-+Qwerty"+/>

++++<View
++++++++android:layout_width="fill_parent"
++++++++android:layout_height="1dp"
++++++++android:background="#33000000"+/>

++++<RadioButton
++++++++android:id="@%2Bid/kb3"
++++++++android:layout_width="fill_parent"
++++++++android:layout_height="wrap_content"
++++++++android:textAppearance="?android:attr/textAppearanceLarge"
++++++++android:button="@null"
++++++++android:drawableRight="@android:drawable/btn_radio"
++++++++android:text="Standard+softkey"+/>

++++<View
++++++++android:layout_width="fill_parent"
++++++++android:layout_height="1dp"
++++++++android:background="#33000000"+/>

++++<RadioButton
++++++++android:id="@%2Bid/kb4"
++++++++android:layout_width="fill_parent"
++++++++android:layout_height="wrap_content"
++++++++android:textAppearance="?android:attr/textAppearanceLarge"
++++++++android:button="@null"
++++++++android:drawableRight="@android:drawable/btn_radio"
++++++++android:text="Physical+keyboard"+/>

++++<View
++++++++android:layout_width="fill_parent"
++++++++android:layout_height="1dp"
++++++++android:background="#33000000"+/>

</RadioGroup>|398562|例如，在这种情况下，使用索引1将生成错误。索引1处的项目是第一个分隔行--而不是radioButton。本例中的radioButtons为索引0、2、4、6。|398563|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Siavash's answer is correct:

<pre><code>((RadioButton)radioGroup.getChildAt(index)).setChecked(true);
</code></pre>

But be aware that a radioGroup can contain views other than radioButtons -- like this example that includes a faint line under each choice.

<pre><code>&lt;RadioGroup
 android:id="@+id/radioKb"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" &gt;

 &lt;RadioButton
 android:id="@+id/kb1"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:textAppearance="?android:attr/textAppearanceLarge"
 android:button="@null"
 android:drawableRight="@android:drawable/btn_radio"
 android:text="Onscreen - ABC" /&gt;

 &lt;View
 android:layout_width="fill_parent"
 android:layout_height="1dp"
 android:background="#33000000" /&gt;

 &lt;RadioButton
 android:id="@+id/kb2"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:textAppearance="?android:attr/textAppearanceLarge"
 android:button="@null"
 android:drawableRight="@android:drawable/btn_radio"
 android:text="Onscreen - Qwerty" /&gt;

 &lt;View
 android:layout_width="fill_parent"
 android:layout_height="1dp"
 android:background="#33000000" /&gt;

 &lt;RadioButton
 android:id="@+id/kb3"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:textAppearance="?android:attr/textAppearanceLarge"
 android:button="@null"
 android:drawableRight="@android:drawable/btn_radio"
 android:text="Standard softkey" /&gt;

 &lt;View
 android:layout_width="fill_parent"
 android:layout_height="1dp"
 android:background="#33000000" /&gt;

 &lt;RadioButton
 android:id="@+id/kb4"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:textAppearance="?android:attr/textAppearanceLarge"
 android:button="@null"
 android:drawableRight="@android:drawable/btn_radio"
 android:text="Physical keyboard" /&gt;

 &lt;View
 android:layout_width="fill_parent"
 android:layout_height="1dp"
 android:background="#33000000" /&gt;

&lt;/RadioGroup&gt;
</code></pre>

In this case using an index of 1, for example, would generate an error. The item at index 1 is the first separator line -- not a radioButton. The radioButtons in this example are at indexes 0, 2, 4, 6.

blocks|key|614625|text|这对我很有效，我通过以下方式动态创建了单选按钮|type|unstyled|depth|inlineStyleRanges|entityRanges|data|614626|++private+void+createRadioButton()+{

++++RadioButton[]+rb+=+new+RadioButton[5];

++++RadioGroup.LayoutParams+layoutParams+=+new+RadioGroup.LayoutParams(
++++++++++++ViewGroup.LayoutParams.WRAP_CONTENT,
++++++++++++ViewGroup.LayoutParams.WRAP_CONTENT,
++++++++++++1.0f);

++++radioGroup.setOrientation(RadioGroup.HORIZONTAL);

++++for+(int+ID+=+0;+ID+<+5;+ID%2B%2B)+{
++++++++rb[ID]+=+new+RadioButton(this);
++++++++rb[ID].setLayoutParams(layoutParams);
++++++++rb[ID].setText("Button_Text");
++++++++radioGroup.addView(rb[ID]);+//the+RadioButtons+are+added+to+the+radioGroup+instead+of+the+layout
++++}
}|code-block|syntax|javascript|614627|现在使用以下命令检查按钮：|614628|int+radio_button_Id+=+radioGroup.getChildAt(index).getId();

radioGroup.check(+radio_button_Id+);|614629|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

This Worked For me, I created radio button dynamically by 

<pre><code> private void createRadioButton() {

 RadioButton[] rb = new RadioButton[5];

 RadioGroup.LayoutParams layoutParams = new RadioGroup.LayoutParams(
 ViewGroup.LayoutParams.WRAP_CONTENT,
 ViewGroup.LayoutParams.WRAP_CONTENT,
 1.0f);

 radioGroup.setOrientation(RadioGroup.HORIZONTAL);

 for (int ID = 0; ID &lt; 5; ID++) {
 rb[ID] = new RadioButton(this);
 rb[ID].setLayoutParams(layoutParams);
 rb[ID].setText("Button_Text");
 radioGroup.addView(rb[ID]); //the RadioButtons are added to the radioGroup instead of the layout
 }
}
</code></pre>

Now Check a button using,

<pre><code>int radio_button_Id = radioGroup.getChildAt(index).getId();

radioGroup.check( radio_button_Id );
</code></pre>

blocks|key|398736|text|使用Kotlin，你可以通过|type|unstyled|depth|inlineStyleRanges|entityRanges|data|398737|++(radio_group_id.getChildAt(index)+as+RadioButton).isChecked+=+true|code-block|syntax|javascript|398738|或|398739|radio_group_id.check(R.id.radio_button_id)|offset|length|style|CODE|398740|entityMap^0|0|0|0|0|15|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@$K|U|L|V|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Using Kotlin you can make it by
<pre><code> (radio_group_id.getChildAt(index) as RadioButton).isChecked = true
</code></pre>
or
<code>radio_group_id.check(R.id.radio_button_id</code>)

blocks|key|614671|text|在onBindViewHolder中将标记设置为按钮组|type|unstyled|depth|inlineStyleRanges|entityRanges|data|614672|@Override
public+void+onBindViewHolder(final+CustomViewHolder+holder,+final+int+position)+{
+++...
+++holder.ButtonGroup.setTag(position);
}|code-block|syntax|javascript|614673|在ViewHolder中|614674|ButtonGroup.setOnCheckedChangeListener(new+RadioGroup.OnCheckedChangeListener()+{
++++@Override
++++public+void+onCheckedChanged(RadioGroup+radioGroup,+int+checkedId)+{
++++++++...
++++++++int+id+=+radioGroup.getCheckedRadioButtonId();

++++++++RadioButton+radioButton+=+(RadioButton)+radioGroup.findViewById(id);

++++++++int+clickedPos+=+(Integer)+radioGroup.getTag();

++++++++packageModelList.get(clickedPos).getPoll_quest()
++++}|614675|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Inside onBindViewHolder set the tag to Button Group

<pre><code>@Override
public void onBindViewHolder(final CustomViewHolder holder, final int position) {
 ...
 holder.ButtonGroup.setTag(position);
}
</code></pre>

and in the ViewHolder 

<pre><code>ButtonGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
 @Override
 public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
 ...
 int id = radioGroup.getCheckedRadioButtonId();

 RadioButton radioButton = (RadioButton) radioGroup.findViewById(id);

 int clickedPos = (Integer) radioGroup.getTag();

 packageModelList.get(clickedPos).getPoll_quest()
 }
</code></pre>

Is there a way to set the selected index of a RadioGroup in android, other than looping through the child radiobuttons and selecting checking the radio button at the selected index?

Note: I am populating the Radio Button Group at run time.

Set selected index of an Android RadioGroup

Kotlin

有没有一种方法可以在android中设置RadioGroup的选中索引，而不是遍历子单选按钮并选择选中选中索引处的单选按钮？注意:我在运行时填充单选按钮组。

问设置Android RadioGroup的选中索引
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问设置Android RadioGroup的选中索引EN

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问设置Android RadioGroup的选中索引
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