[英]How to get the selected index of a RadioGroup in Android
Is there an easy way to get the selected index of a RadioGroup in Android or do I have to use OnCheckedChangeListener to listen for changes and have something that holds the last index selected?有没有一种简单的方法可以在 Android 中获取 RadioGroup 的选定索引,或者我是否必须使用 OnCheckedChangeListener 来侦听更改并保存最后一个选定索引的内容?
example xml:例如 xml:
<RadioGroup android:id="@+id/group1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical">
<RadioButton android:id="@+id/radio1" android:text="option 1" android:layout_width="wrap_content" android:layout_height="wrap_content" />
<RadioButton android:id="@+id/radio2" android:text="option 2" android:layout_width="wrap_content" android:layout_height="wrap_content" />
<RadioButton android:id="@+id/radio3" android:text="option 3" android:layout_width="wrap_content" android:layout_height="wrap_content" />
<RadioButton android:id="@+id/radio4" android:text="option 4" android:layout_width="wrap_content" android:layout_height="wrap_content" />
<RadioButton android:id="@+id/radio5" android:text="option 5" android:layout_width="wrap_content" android:layout_height="wrap_content" />
</RadioGroup>
if a user selects option 3
I want to get the index, 2.如果用户选择
option 3
,我想获取索引 2。
You should be able to do something like this:你应该能够做这样的事情:
int radioButtonID = radioButtonGroup.getCheckedRadioButtonId();
View radioButton = radioButtonGroup.findViewById(radioButtonID);
int idx = radioButtonGroup.indexOfChild(radioButton);
If the RadioGroup
contains other Views (like a TextView
) then the indexOfChild()
method will return wrong index.如果
RadioGroup
包含其他视图(如TextView
),则indexOfChild()
方法将返回错误的索引。
To get the selected RadioButton
text on the RadioGroup
:要在
RadioGroup
上获取选定的RadioButton
文本:
RadioButton r = (RadioButton) radioButtonGroup.getChildAt(idx);
String selectedtext = r.getText().toString();
这应该有效,
int index = myRadioGroup.indexOfChild(findViewById(myRadioGroup.getCheckedRadioButtonId()));
You could have a reference to the radio group and use getCheckedRadioButtonId ()
to get the checked radio button id.您可以引用单选组并使用
getCheckedRadioButtonId ()
获取选中的单选按钮 ID。 Take a look here看看这里
RadioGroup radioGroup = (RadioGroup)findViewById(R.id.radio_group);
Then when you need to get the selected radio option.然后当您需要获取选定的无线电选项时。
int checkedRadioButtonId = radioGroup.getCheckedRadioButtonId();
if (checkedRadioButtonId == -1) {
// No item selected
}
else{
if (checkedRadioButtonId == R.id.radio_button1) {
// Do something with the button
}
}
try this尝试这个
RadioGroup group= (RadioGroup) getView().findViewById(R.id.radioGroup);
group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup, int i) {
View radioButton = radioGroup.findViewById(i);
int index = radioGroup.indexOfChild(radioButton);
}
});
您可以使用 OnCheckedChangeListener 或使用 getCheckedRadioButtonId ()
您可以使用:
RadioButton rb = (RadioButton) findViewById(rg.getCheckedRadioButtonId());
//use to get the id of selected item //用于获取选中项的id
int selectedID = myRadioGroup.getCheckedRadioButtonId();
//get the view of the selected item //获取选中项的视图
View selectedView = (View)findViewById( selectedID);
It worked perfectly for me in this way:它以这种方式对我来说非常有效:
RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radio_group);
int radioButtonID = radioGroup.getCheckedRadioButtonId();
RadioButton radioButton = (RadioButton) radioGroup.findViewById(radioButtonID);
String selectedtext = (String) radioButton.getText();
All you need is to set values first to your RadioButton, for example:您只需要先为 RadioButton 设置值,例如:
RadioButton radioButton = (RadioButton)findViewById(R.id.radioButton);
radioButton.setId(1); //some int value
and then whenever this spacific radioButton will be chosen you can pull its value by the Id you gave it with然后每当这个空间单选按钮被选择时,你就可以通过你给它的 Id 来提取它的值
RadioGroup radioGroup = (RadioGroup)findViewById(R.id.radioGroup);
int whichIndex = radioGroup.getCheckedRadioButtonId(); //of course the radioButton
//should be inside the "radioGroup"
//in the XML
Cheers!干杯!
radioSexGroup=(RadioGroup)findViewById(R.id.radioGroup);
btnDisplay=(Button)findViewById(R.id.button);
btnDisplay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int selectedId=radioSexGroup.getCheckedRadioButtonId();
radioSexButton=(RadioButton)findViewById(selectedId);
Toast.makeText(MainActivity.this,radioSexButton.getText(),Toast.LENGTH_SHORT).show();
}
});
Late to the party, but here is a simplification of @Tarek360's Kotlin answer that caters for RadioGroup
s that might contain non-RadioButtons:聚会迟到了,但这里是 @Tarek360 的 Kotlin 答案的简化版,它适用于可能包含非 RadioButtons 的
RadioGroup
:
val RadioGroup.checkedIndex: Int
get() = children
.filter { it is RadioButton }
.indexOfFirst { it.id == checkedRadioButtonId }
If you're RadioFroup
definitely only has RadioButton
s then this can be a simple as:如果你是
RadioFroup
肯定只有RadioButton
s 那么这可以是一个简单的:
private val RadioGroup.checkedIndex =
children.indexOfFirst { it.id == checkedRadioButtonId }
Then you don't have the overhead of findViewById
.那么你就没有
findViewById
的开销。
int index_selected = radio_grp.indexOfChild(radio_grp
.findViewById(radio_grp.getCheckedRadioButtonId()));
just use this:只需使用这个:
int index = 2;
boolean option3Checked = radioGroup.getCheckedRadioButtonId() == radioGroup.getChildAt(2).getId();
Here is a Kotlin extension to get the correct position even if your group contains a TextView or any non-RadioButton.这是一个Kotlin扩展,即使您的组包含 TextView 或任何非 RadioButton,也可以获得正确的位置。
fun RadioGroup.getCheckedRadioButtonPosition(): Int {
val radioButtonId = checkedRadioButtonId
return children.filter { it is RadioButton }
.mapIndexed { index: Int, view: View ->
index to view
}.firstOrNull {
it.second.id == radioButtonId
}?.first ?: -1
}
you can do你可以做
findViewById
from the radio group .来自广播组。
Here it is sample :这是示例:
((RadioButton)my_radio_group.findViewById(R.id.radiobtn_veg)).setChecked(true);
You can simply你可以简单地
-declare the radio group and a radio button out of onCreate method - 从 onCreate 方法中声明单选组和单选按钮
private RadioGroup GrupName;
private RadioButton NameButton;
-set the view id in the onCreate method - 在 onCreate 方法中设置视图 ID
GrupName = (RadioGroup) findViewById(R.id.radioGroupid);
-take the radiobutton id selected using - 使用选择的单选按钮 ID
int id = GroupName.getCheckedRadioButtonId();
-use the id to match the buttonselected view - 使用 id 来匹配 buttonselected 视图
NameButton = (RadioButton) findViewById(id);
-finally get the value of the radio button - 最终获取单选按钮的值
String valueExpected = NameButton.getText().toString();
--- PS: IF YOU WANT AN INT VALUE, THEN YOU CAN CAST IT --- PS:如果你想要一个 INT 值,那么你可以投射它
int valueExpectedIn = Integer.parseInt(valueExpected);
Kotlin:
科特林:
val selectedIndex = radioButtonGroup?.indexOfChild(
radioButtonGroup?.findViewById(
radioButtonGroup.getCheckedRadioButtonId())
)
radioSexGroup = (RadioGroup) findViewById(R.id.radioSex);
btnDisplay = (Button) findViewById(R.id.btnDisplay);
btnDisplay.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// get selected radio button from radioGroup
int selectedId = radioSexGroup.getCheckedRadioButtonId();
// find the radiobutton by returned id
radioSexButton = (RadioButton) findViewById(selectedId);
Toast.makeText(MainActivity.this,radioSexButton.getText(),Toast.LENGTH_SHORT).show();
}
});
You have already assigned an id for each radio button.您已经为每个单选按钮分配了一个 id。 With a case block you can detect manually the selected radio button or with OnCheckedChangeListener you get it too.
使用 case 块,您可以手动检测选定的单选按钮,或者使用 OnCheckedChangeListener 也可以检测到它。
xml: xml:
<RadioGroup
android:id="@+id/rd_group_pick_reason"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@id/ti_titel"
android:orientation="horizontal"
android:paddingHorizontal="16dp"
>
<com.google.android.material.radiobutton.MaterialRadioButton
android:id="@+id/rd_not_deliverable"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:text="@string/txt_not_deliverable"
android:checked="true"
/>
<com.google.android.material.radiobutton.MaterialRadioButton
android:id="@+id/rd_after_pack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:text="@string/txt_after_pack"
/>
</RadioGroup>
java: java:
final RadioGroup radioGroup = dialogView.findViewById(R.id.rd_group_pick_reason);
switch (radioGroup.getCheckedRadioButtonId()) {
case R.id.rd_not_deliverable:
// TODO
break;
case R.id.rd_after_pack:
// TODO
break;
}
or或者
radioGroup.setOnCheckedChangeListener((group, checkedId) -> {
switch (group.getCheckedRadioButtonId()) {
case R.id.rd_not_deliverable:
System.out.println("not deliverable");
break;
case R.id.rd_after_pack:
System.out.println("after pack");
break;
}
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