Since several days, I search how to retrieve the checked radio Button ID, and after display the RadioButton checked in a Toast. But I get NULLPOINTER EXECEPTION for the int ID_LANGUE. I use this code :
enter code here
int ID_LANGUE = radioGroup_LANGUE.getCheckedRadioButtonId();
RadioButton rb_L = (RadioButton)findViewById(ID_LANGUE);
if (rb_L.equals("Anglais")){
Toast.makeText(MainActivity.this,"Anglais",Toast.LENGTH_LONG).show();
}
You have to get the radio group first by
RadioGroup rg = (RadioGroup) findViewById(R.id.RadioGroup_LANGUE);
Then you can use setOnCheckedChangeListener to determine which radio button was clicked actually.
rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()
{
public void onCheckedChanged(RadioGroup group, int checkedId) {
switch(checkedId){
case R.id.radio0:
//you selected radio0
break;
case R.id.radio1:
//you selected radio1
break;
}
}
});
Other way is using getCheckedRadioButtonId also int id = radioGroup.getCheckedRadioButtonId(); you get hold of selected radio id.
Related
I want to access the RadioButton from the RadioGroup,
int selectedId = radioFeeGroup.getCheckedRadioButtonId();
radioFeeButton = (RadioButton) findViewById(selectedId);
I am getting selectedId value -1. That's why application get crashed.
Make Sure you are selecting at least one Radio button from the group.
See the Document
Your code is correct,
int selectedId = radioFeeGroup.getCheckedRadioButtonId();
radioFeeButton = (RadioButton) findViewById(selectedId);
If you are already selecting the RadioButton then clean the project & Rebuild it again it should work if you are accessing RadioGroup correctly from xml.
Check this
radioFeeGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
#Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
int radioButtonID = radioFeeGroup.getCheckedRadioButtonId();
View radioButton = radioFeeGroup.findViewById(radioButtonID);
int position = group.indexOfChild(radioButton);
}
});
Check this examples
How to get the id of selected radio button in android?
How to get id of selected radio button in a radio group
I want to highlight right and wrong option when user clicks a button after checking an radio button. If that option is right, highlight. Else highlight right option.
Is there any way to get radio button id in a group based on its value? Or Do I need to use switch case?
I searched enough but not able to find out what I need.
Edit
I have simple layout which contains one question, 4 choices, one button. User check a radio button and click the check button. If user selects wrong option, highlight the correct option. I know what is correct option by value.
choice1, choice2, choice3, choice4 are four radio buttons. User checks choice3. But choice2 is correct. How do I select choice2 by value in this radio group.
group.getRadioButtonId("choice2")
Anything similar to this?
You could iterate through the children of your RadioGroup to get the required one:
int count = radioGroup.getChildCount();
for (int i = 0 ; i < count; i++) {
RadioButton button = (RadioButton) radioGroup.getChildAt(i);
if (button.getText().equals("choice2")) {
int id = button.getId(); // the ID you're looking for
}
}
You Can check like this
#Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
int rbId = group.getCheckedRadioButtonId();
RadioButton rb = (RadioButton) findViewById(rbId);
switch (group.getId()) {
case R.id.radiogroupID:
if (rb.getText().toString().equalsIgnoreCase("right")) {
// your logic
} else {
//your logic
}
}
}
you can use these line. its working for me
int checkedId = radioGroup.getCheckedRadioButtonId();
View radioButton = radioGroup.findViewById(checkedId);
int radioId = radioGroup.indexOfChild(radioButton);
RadioButton btn = (RadioButton) radioGroup.getChildAt(radioId);
First check which option is true. hear choice 2 OK. set by default is checked true and than check user checked value . if user select other option than display message and pass true option we already checked true
Create an int array with all the ids of the radiobutton
int[] rb_IDs=new int[]{R.id.rb1,R.id.rb2,R.id.rb3};
Then inside your button click :
RadioGroup rg=(RadioGroup) findViewById(R.id.rg);
rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
for (int i=0;i<rb_IDs.length;i++)
{
RadioButton rb=(RadioButton)findViewById(rb_IDs[i]);
if (rb.getText().toString().equals("YOUR CORRECT ANSWER")&&!rb.isChecked())
{
//
//Do your thing
//
//ID of the correct answer Radiobutton is
int id=rb_IDs[i];
//HighLighting the answer
rb.setBackgroundColor(Color.parseColor("#00ff00"));
break;
}
}
}
});
I am making an application that has list and Radio Buttons. My Layout contains of the following : a list , A button .
The List contains of Radio buttons. Two radio Buttons. After checking the buttons. I want to make a loop that reads the values of how many are in Button one and how many in Button Two.
This is how I have done so far.
ListViewStudentEditAbsence country ;
for(int i=0;i<listViewStudentNames.size();i++) {
country = listViewStudentNames.get(i);
if (country.getAbsence()==1) {
Absence[i] = "1";
} else {
Absence[i] ="0";
}
}
But It doesn't seem to work.
In your CustomAdapter getView() method
int value=0; //globally
RadioGroup radioGroup = (RadioGroup) convertView.findViewById(R.id.yourRadioGroup);
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener()
{
#Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// checkedId is the RadioButton selected
if (checkedId == R.id.rbutton1) {
value=10; //a's value
} else if (checkedId == R.id.rbutton2) {
value=20; //b's value
}
}
});
https://stackoverflow.com/questions/11194515/android-get-value-of-the-selected-radio-button
Android getting value from selected radiobutton
Hope it works. This two links give you proper knowledge about fetching value.
I am not sure if it is even possible but if it is I would appreciate your help! I need to change the textHint depending which radioButton is checked Radio Buttons. For example, I want the editText Hint to display "Miles" if the US radioButon is checked; and when the radioButton Metric is checked I want the textHint to display "Kilometers."
I attempted to solve this multiple time but constantly fail.
Tanks ahead of time!
RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radioGroup1);
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
// checkedId is the RadioButton selected
switch (checkedId) {
case R.id.radioButtonUS:
Toast.makeText(getApplicationContext(), "hello", Toast.LENGTH_LONG).show();
Distance.setHint("Miles");
break;
case R.id.radioButtonMetric:
Toast.makeText(getApplicationContext(), "hello", Toast.LENGTH_LONG).show();
Distance.setHint("Kilometers");
break;
}
}
});
You can use setHint(hint); on your EditText to change the Hint.
You can use a listener on your radioButton to detect when one is selected.
I have two RadioButtons inside a RadioGroup. I want to set OnClickListener on those RadioButtons. Depending on which RadioButton is clicked, I want to change the text of an EditText. How can I achieve this?
I'd think a better way is to use RadioGroup and set the listener on this to change and update the View accordingly (saves you having 2 or 3 or 4 etc listeners).
RadioGroup radioGroup = (RadioGroup) findViewById(R.id.yourRadioGroup);
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener()
{
#Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// checkedId is the RadioButton selected
}
});
Hope this will help you...
RadioButton rb = (RadioButton) findViewById(R.id.yourFirstRadioButton);
rb.setOnClickListener(first_radio_listener);
and
OnClickListener first_radio_listener = new OnClickListener (){
public void onClick(View v) {
//Your Implementaions...
}
};
radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()
{
public void onCheckedChanged(RadioGroup group, int checkedId) {
// checkedId is the RadioButton selected
RadioButton rb=(RadioButton)findViewById(checkedId);
textViewChoice.setText("You Selected " + rb.getText());
//Toast.makeText(getApplicationContext(), rb.getText(), Toast.LENGTH_SHORT).show();
}
});
The question was about Detecting which radio button is clicked, this is how you can get which button is clicked
final RadioGroup radio = (RadioGroup) dialog.findViewById(R.id.radioGroup1);
radio.setOnCheckedChangeListener(new OnCheckedChangeListener() {
#Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
View radioButton = radio.findViewById(checkedId);
int index = radio.indexOfChild(radioButton);
// Add logic here
switch (index) {
case 0: // first button
Toast.makeText(getApplicationContext(), "Selected button number " + index, 500).show();
break;
case 1: // secondbutton
Toast.makeText(getApplicationContext(), "Selected button number " + index, 500).show();
break;
}
}
});
For Kotlin Here is added the lambda expression and Optimized the Code.
radioGroup.setOnCheckedChangeListener { radioGroup, optionId ->
run {
when (optionId) {
R.id.radioButton1 -> {
// do something when radio button 1 is selected
}
R.id.radioButton2 -> {
// do something when radio button 2 is selected
}
// add more cases here to handle other buttons in the your RadioGroup
}
}
}
Hope this will help you. Thanks!
You could also add listener from XML layout: android:onClick="onRadioButtonClicked" in your <RadioButton/> tag.
<RadioButton android:id="#+id/radio_pirates"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/pirates"
android:onClick="onRadioButtonClicked"/>
See Android developer SDK- Radio Buttons for details.
Since this question isn't specific to Java, I would like to add how you can do it in Kotlin:
radio_group_id.setOnCheckedChangeListener({ radioGroup, optionId -> {
when (optionId) {
R.id.radio_button_1 -> {
// do something when radio button 1 is selected
}
// add more cases here to handle other buttons in the RadioGroup
}
}
})
Here radio_group_id is the assigned android:id of the concerned RadioGroup. To use it this way you would need to import kotlinx.android.synthetic.main.your_layout_name.* in your activity's Kotlin file. Also note that in case the radioGroup lambda parameter is unused, it can be replaced with _ (an underscore) since Kotlin 1.1.
Just in case someone else was struggeling with the accepted answer:
There are different OnCheckedChangeListener-Interfaces. I added to first one to see if a CheckBox was changed.
import android.widget.CompoundButton.OnCheckedChangeListener;
vs
import android.widget.RadioGroup.OnCheckedChangeListener;
When adding the snippet from Ricky I had errors:
The method setOnCheckedChangeListener(RadioGroup.OnCheckedChangeListener) in the type RadioGroup is not applicable for the arguments (new CompoundButton.OnCheckedChangeListener(){})
Can be fixed with answer from Ali :
new RadioGroup.OnCheckedChangeListener()
RadioGroup radioGroup = (RadioGroup) findViewById(R.id.yourRadioGroup);
radioGroup.setOnClickListener(v -> {
// get selected radio button from radioGroup
int selectedId = radioGroup.getCheckedRadioButtonId();
// find the radiobutton by returned id
radioButton = findViewById(selectedId);
String slectedValue=radioButton.getText()
});