blocks|key|442433|text|您应该像这样选中radiogroup中的单选按钮：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|442434|radiogroup.check(IdOfYourButton)|offset|length|style|CODE|442435|当然，您首先必须为您的单选按钮设置一个Id|442436|编辑:我忘了，radioButton.getId()也能用，谢谢拉梅什|442437|EDIT2：|442438|android:checkedButton="@%2Bid/my_radiobtn"|code-block|syntax|javascript|442439|在radiogroup+xml中工作|442440|entityMap^0|0|0|W|0|0|7|J|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|11|8|@$D|12|E|13|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|14|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|15|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

you should check the radiobutton in the radiogroup like this:

<code>radiogroup.check(IdOfYourButton)</code>

Of course you first have to set an Id to your radiobuttons

EDIT: i forgot, <code>radioButton.getId()</code> works as well, thx Ramesh

EDIT2: 

<pre class="lang-xml prettyprint-override"><code>android:checkedButton="@+id/my_radiobtn"
</code></pre>

works in radiogroup xml

blocks|key|442483|text|++++RadioGroup+radioGroup+=+new+RadioGroup(WvActivity.this);
++++RadioButton+radioBtn1+=+new+RadioButton(this);
++++RadioButton+radioBtn2+=+new+RadioButton(this);
++++RadioButton+radioBtn3+=+new+RadioButton(this);

++++radioBtn1.setText("Less");
++++radioBtn2.setText("Normal");
++++radioBtn3.setText("More");


++++radioGroup.addView(radioBtn1);
++++radioGroup.addView(radioBtn2);
++++radioGroup.addView(radioBtn3);

++++radioGroup.check(radioBtn2.getId());|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|442484|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> RadioGroup radioGroup = new RadioGroup(WvActivity.this);
 RadioButton radioBtn1 = new RadioButton(this);
 RadioButton radioBtn2 = new RadioButton(this);
 RadioButton radioBtn3 = new RadioButton(this);

 radioBtn1.setText("Less");
 radioBtn2.setText("Normal");
 radioBtn3.setText("More");


 radioGroup.addView(radioBtn1);
 radioGroup.addView(radioBtn2);
 radioGroup.addView(radioBtn3);

 radioGroup.check(radioBtn2.getId());
</code></pre>

blocks|key|442530|text|我同事的代码中也有同样的问题。这听起来是因为您的单选按键未正确设置您的单播组。这就是您可以多选单选按钮的原因。我尝试了很多东西，最后我做了一个实际上是错误的技巧，但效果很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|442531|for+(+int+i+=+0+;+i+<+myCount+;+i%2B%2B+)
{
++++if+(+i+!=+k+)
++++{
++++++++System.out.println+(+"i+=+"+%2B+i+);
++++++++radio1[i].setChecked(false);
++++}
}|code-block|syntax|javascript|442532|在这里，我设置了一个for循环，它检查可用的单选按钮，并取消选择除新单击的单选按钮之外的所有单选按钮。试试看。|442533|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

There was same problem in my Colleague's code. This sounds as your Radio Group is not properly set with your Radio Buttons. This is the reason you can multi-select the radio buttons. I tried many things, finally i did a trick which is wrong actually, but works fine. 

<pre><code>for ( int i = 0 ; i &lt; myCount ; i++ )
{
 if ( i != k )
 {
 System.out.println ( "i = " + i );
 radio1[i].setChecked(false);
 }
}
</code></pre>

Here I set one for loop, which checks for the available radio buttons and de-selects every one except the new clicked one. try it.

blocks|key|442539|text|RadioGroup+radioGroup+=+new+RadioGroup(context);
RadioButton+radioBtn1+=+new+RadioButton(context);
RadioButton+radioBtn2+=+new+RadioButton(context);
RadioButton+radioBtn3+=+new+RadioButton(context);

radioBtn1.setText("Less");
radioBtn2.setText("Normal");
radioBtn3.setText("More");

radioGroup.addView(radioBtn1);
radioGroup.addView(radioBtn2);
radioGroup.addView(radioBtn3);
radioBtn2.setChecked(true);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|442540|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>RadioGroup radioGroup = new RadioGroup(context);
RadioButton radioBtn1 = new RadioButton(context);
RadioButton radioBtn2 = new RadioButton(context);
RadioButton radioBtn3 = new RadioButton(context);

radioBtn1.setText("Less");
radioBtn2.setText("Normal");
radioBtn3.setText("More");

radioGroup.addView(radioBtn1);
radioGroup.addView(radioBtn2);
radioGroup.addView(radioBtn3);
radioBtn2.setChecked(true);
</code></pre>

blocks|key|442582|text|对于xml属性，它的android:checkedButton接受要检查的RadioButton的id。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|442583|<RadioGroup
...
...
android:checkedButton="@%2Bid/IdOfTheRadioButtonInsideThatTobeChecked"
...+>....</RadioGroup>|code-block|syntax|javascript|442584|entityMap^0|A|L|11|B|1D|2|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

In case for xml attribute its <code>android:checkedButton</code> which takes the <code>id</code> of the <code>RadioButton</code> to be checked.

<pre><code>&lt;RadioGroup
...
...
android:checkedButton="@+id/IdOfTheRadioButtonInsideThatTobeChecked"
... &gt;....&lt;/RadioGroup&gt;
</code></pre>

blocks|key|442620|text|在XML文件中，使用默认RadioButton的id设置RadioGroup中的android:checkedButton字段：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|442621|<RadioGroup
++++....
++++android:checkedButton="@%2Bid/button_1">

++++<RadioButton
++++++++android:id="@%2Bid/button_1"
++++++++...../>

++++<RadioButton
++++++++android:id="@%2Bid/button_2"
++++++++...../>

++++<RadioButton
++++++++android:id="@%2Bid/button_3"
++++++++...../>
</RadioGroup>|code-block|syntax|javascript|442622|entityMap^0|C|B|S|A|14|L|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

In the XML file set the <code>android:checkedButton</code> field in your <code>RadioGroup</code>, with the id of your default <code>RadioButton</code>: 

<pre><code>&lt;RadioGroup
 ....
 android:checkedButton="@+id/button_1"&gt;

 &lt;RadioButton
 android:id="@+id/button_1"
 ...../&gt;

 &lt;RadioButton
 android:id="@+id/button_2"
 ...../&gt;

 &lt;RadioButton
 android:id="@+id/button_3"
 ...../&gt;
&lt;/RadioGroup&gt;
</code></pre>

blocks|key|657121|text|这是RadioGroup的一个错误|type|unstyled|depth|inlineStyleRanges|entityRanges|data|657122|RadioButton+radioBtn2+=+new+RadioButton(context);|code-block|syntax|javascript|657123|不带viewId的radioBtn2，generateViewId在onChildViewAdded()中|657124|public+void+onChildViewAdded(View+parent,+View+child)+{
++++if+(parent+==+RadioGroup.this+&&+child+instanceof+RadioButton)+{
++++++++int+id+=+child.getId();
++++++++//+generates+an+id+if+it's+missing
++++++++if+(id+==+View.NO_ID)+{
++++++++++++id+=+View.generateViewId();
++++++++++++child.setId(id);
++++++++}
++++++++((RadioButton)+child).setOnCheckedChangeWidgetListener(
++++++++++++++++mChildOnCheckedChangeListener);
++++}

++++if+(mOnHierarchyChangeListener+!=+null)+{
++++++++mOnHierarchyChangeListener.onChildViewAdded(parent,+child);
++++}
}|657125|因此，首先是radioGroup.addView(radioBtn2)，然后是RadiBtn2.setChecked(True)；|657126|如下所示：|657127|RadioGroup+radioGroup+=+new+RadioGroup(context);
RadioButton+radioBtn1+=+new+RadioButton(context);
RadioButton+radioBtn2+=+new+RadioButton(context);
RadioButton+radioBtn3+=+new+RadioButton(context);

radioBtn1.setText("Less");
radioBtn2.setText("Normal");
radioBtn3.setText("More");

radioGroup.addView(radioBtn1);
radioGroup.addView(radioBtn2);
radioGroup.addView(radioBtn3);

radioBtn2.setChecked(true);|657128|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

It's a bug of RadioGroup

<pre><code>RadioButton radioBtn2 = new RadioButton(context);
</code></pre>

radioBtn2 without viewId, and generateViewId is in onChildViewAdded()

<pre><code>public void onChildViewAdded(View parent, View child) {
 if (parent == RadioGroup.this &amp;&amp; child instanceof RadioButton) {
 int id = child.getId();
 // generates an id if it's missing
 if (id == View.NO_ID) {
 id = View.generateViewId();
 child.setId(id);
 }
 ((RadioButton) child).setOnCheckedChangeWidgetListener(
 mChildOnCheckedChangeListener);
 }

 if (mOnHierarchyChangeListener != null) {
 mOnHierarchyChangeListener.onChildViewAdded(parent, child);
 }
}
</code></pre>

so, first radioGroup.addView(radioBtn2), then radioBtn2.setChecked(true); 

Like this:

<pre><code>RadioGroup radioGroup = new RadioGroup(context);
RadioButton radioBtn1 = new RadioButton(context);
RadioButton radioBtn2 = new RadioButton(context);
RadioButton radioBtn3 = new RadioButton(context);

radioBtn1.setText("Less");
radioBtn2.setText("Normal");
radioBtn3.setText("More");

radioGroup.addView(radioBtn1);
radioGroup.addView(radioBtn2);
radioGroup.addView(radioBtn3);

radioBtn2.setChecked(true);
</code></pre>

blocks|key|657155|text|在activity.xml中添加android:checked+=+"true"|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|657156|entityMap^0|G|O|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Add <code>android:checked = "true"</code> in your activity.xml

I have created <code>RadioGroup</code> and <code>RadioButton</code> dynamically as following:

<pre><code>RadioGroup radioGroup = new RadioGroup(context);
 RadioButton radioBtn1 = new RadioButton(context);
 RadioButton radioBtn2 = new RadioButton(context);
 RadioButton radioBtn3 = new RadioButton(context);

 radioBtn1.setText("Less");
 radioBtn2.setText("Normal");
 radioBtn3.setText("More");

 radioBtn2.setChecked(true);

 radioGroup.addView(radioBtn1);
 radioGroup.addView(radioBtn2);
 radioGroup.addView(radioBtn3);
</code></pre>

Here step <code>radioBtn2.setChecked(true);</code> causes <code>radioBtn2</code> always checked. That means I cannot uncheck <code>radioBtn2</code> by checking other two radio buttons (<code>radioBtn1</code>,<code>radioBtn3</code>). I want to make that <code>RadioGroup</code> can check only one radio button at a time (Now it can check two radiobutton at a time).

How can I solve this problem?

How to set radio button checked as default in radiogroup?

我动态创建了RadioGroup和RadioButton，如下所示：RadioGroup radioGroup = new RadioGroup(context);                    RadioButton radioBtn1 = new RadioButton(context);         ...

问如何在radiogroup中将选中的单选按钮设置为默认值？
EN

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问如何在radiogroup中将选中的单选按钮设置为默认值？
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