Develop Reference

Code-generated radiobuttons check selection

I have some code that generates in the activity some radiobuttons:
public void drawRAnswers(int pst){
int drawables = qmclist.get(pst).getAnswers().size();
RadioGroup l1 = new RadioGroup(this);
l1.setOrientation(LinearLayout.VERTICAL);
for (int i=0;i<drawables;i++){
RadioButton rd = new RadioButton(this);
rd.setId(i);
rd.setText(current.getAnswers().get(i).getAns());
l1.addView(rd);
}
parentLinearLayout.addView(l1, parentLinearLayout.getChildCount());
}
What I want to do is be able to verify which ones (radiobuttons) are checked when I click a button:
public void onAddAnswer(View v){
position++;
delete();
drawRAnswers(position);
}
For now, what this button does is only load the next set of radiobuttons in the view and delete the current ones, but I don't check which ones are selected. Do you know how I could do this in this onAddAnswer method? I would like to put the text of each selected radiobutton in a list.
Thanks.

I managed to figure this one out myself. Here is what I have done:
public class Activity extends AppCompatActivity {
RadioGroup currentGroup;
...
public void onAddAnswer(View v){
if (currentGroup.getCheckedRadioButtonId()==-1){
Toast.makeText(getApplicationContext(), "Veuillez sélectionner au moins une réponse",
Toast.LENGTH_LONG).show();
} else {
int selectedId = currentGroup.getCheckedRadioButtonId();
RadioButton selectedRadio = (RadioButton)findViewById(selectedId);
Toast.makeText(getApplicationContext(), selectedRadio.getText().toString()+" is selected",
Toast.LENGTH_SHORT).show();
position++;
delete();
updateData(position);
}
}
...
public void drawRAnswers(int pst){
int drawables = qmclist.get(pst).getAnswers().size();
RadioGroup l1 = new RadioGroup(this);
currentGroup = l1;
l1.setOrientation(LinearLayout.VERTICAL);
for (int i=0;i<drawables;i++){
RadioButton rd = new RadioButton(this);
rd.setId(i);
rd.setText(current.getAnswers().get(i).getAns());
l1.addView(rd);
}
parentLinearLayout.addView(l1, parentLinearLayout.getChildCount());
}
}
So basically what I am doing is have a RadioGroup for every time I draw radiobuttons, match it with the currentGroup and check if I have (or not) any radiobuttons selected. If yes, then I find out which one.

How to uncheck all other check boxes except only one box ?

I have two check boxes in a alert dialog box. What I want is that if one of the checkbox is clicked then other checkbox gets unchecked automatically. Only one checkbox can be clicked at a time. I've searched the internet and tried multiple solutions but no solution is working.

find ids of your check boxs...
checkBoxOne= (CheckBox)findViewById(R.id.checkBox1);
checkBoxTwo= (CheckBox)findViewById(R.id.checkBox2);
checkBoxOne.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if(isChecked){
Here you unchecked the other check boxes
checkBoxTwo.setChecked(false);
}
}
});
checkBoxTwo.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if(isChecked){
Here you unchecked the other check boxes
checkBoxOne.setChecked(false);
}
}
});

If you really want to use a CheckBox you have to programmatically uncheck the other button:
private void createCustomDialogCheckBox() {
LinearLayout dialogLayout = new LinearLayout(this);
dialogLayout.setOrientation(LinearLayout.VERTICAL);
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(MainActivity.this);
final CheckBox checkBoxOption1 = new CheckBox(this);
final CheckBox checkBoxOption2 = new CheckBox(this);
checkBoxOption1.setText("Option 1");
checkBoxOption2.setText("Option 2");
checkBoxOption1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
CheckBox otherCheckBox = checkBoxOption2;
if(isChecked && otherCheckBox.isChecked()){
otherCheckBox.setChecked(!otherCheckBox.isChecked());
}
}
});
checkBoxOption2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
CheckBox otherCheckBox = checkBoxOption1;
if(isChecked && otherCheckBox.isChecked()){
otherCheckBox.setChecked(!otherCheckBox.isChecked());
}
}
});
dialogLayout.addView(checkBoxOption1);
dialogLayout.addView(checkBoxOption2);
dialogBuilder.setView(dialogLayout);
dialogBuilder.show();
}
A better solution is to use RadioButton with does all this automatically:
private void createCustomDialogRadioButton() {
LinearLayout dialogLayout = new LinearLayout(this);
dialogLayout.setOrientation(LinearLayout.VERTICAL);
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(MainActivity.this);
RadioButton radioButtonOption1 = new RadioButton(this);
RadioButton radioButtonOption2 = new RadioButton(this);
radioButtonOption1.setText("Option 1");
radioButtonOption2.setText("Option 2");
RadioGroup radioGroup = new RadioGroup(this);
// radio buttons must be on the same radio group
// so that other buttons will automatically be unchecked / unselected
radioGroup.addView(radioButtonOption1);
radioGroup.addView(radioButtonOption2);
dialogLayout.addView(radioGroup);
dialogBuilder.setView(dialogLayout);
dialogBuilder.show();
}

How to check RadioButton is checked when added dynamically?

In my application I am adding RadioButton dynamically depending on requirement.
Below is the code :
RadioGroup rg = new RadioGroup(StartExamActivity.this);
View v = new View(StartExamActivity.this);
v.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 2));
v.setBackgroundColor(Color.parseColor("#3593D4"));
rg.setLayoutParams(new RadioGroup.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
rg.setOrientation(LinearLayout.VERTICAL);
for (int i = 0; i < list.size(); i++) {
rdbtn[i] = new RadioButton(StartExamActivity.this);
rdbtn[i].setLayoutParams(new RadioGroup.LayoutParams(RadioGroup.LayoutParams.MATCH_PARENT, RadioGroup.LayoutParams.WRAP_CONTENT, 1f));
rdbtn[i].setId(i);
rdbtn[i].setText(list.get(i));
final String value = rdbtn[i].getText().toString();
rdbtn[i].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (value.equalsIgnoreCase(answer)) {
marks = marks + 2;
}
}
});
rg.addView(rdbtn[i]);
}
questionContainer.addView(rg);
Now I want to increase the value of marks by 2 only ones even when RadioButton is checked multiple times. For that I want to know whether RadioButton is checked or not.
How to do this??
Please Help!!

Simple thing,
Why don't you use OnClickListener instead of onCheckedChanged>
rdbtn[i].setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
if(isChecked) {
// Write your logic here...
}
});

Table with Radiobuttons in Android

I am looking for something similar in android where I can add radiobuttons to each cells in Table and get their position. Does anyone has worked on it before, if you can share the sample code would be helpful. Thanks

The following pseudocode should get you started:
//create a radio group
RadioGroup rg = new RadioGroup(context);
RadioGroup.LayoutParams rgParams = new RadioGroup.LayoutParams(
RadioGroup.LayoutParams.WRAP_CONTENT,
RadioGroup.LayoutParams.WRAP_CONTENT);
rg.setLayoutParams(rgParams);
//add the radio group to the row.
rowView.addView(rg);
//add radio buttons
for (i = 0; i < length; i++) {
RadioButton btn = new RadioButton(context);
btn.setText(description[i]);
//or save an object which will hold all information you need
btn.setTag(rowNumber);
btn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Log.d(TAG, v.getTag());
}
});
if (<some condition>) {
btn.setChecked(true);
}
rg.addView(btn);
}

Creation of RadioGroup in Android java class

I am new to android development. I want to create RadioButton group programmetically in java class and set the text to the individual radio buttons.
Please Help on this
Thanks in Advance.

This program block shows how to create RadioButton group programmatically.
Hope it will help you.
public class RadioGroupActivity extends Activity {
protected static final String TAG = "RadioGroupActivity";
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.radiogroup);
RadioGroup radGrp = (RadioGroup)findViewById(R.id.radGrp);
int checkedRadioButtonID = radGrp.getCheckedRadioButtonId();
radGrp.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup arg0, int id) {
switch(id) {
case -1:
Log.v(TAG, "Choices cleared!");
break;
case R.id.chRBtn:
Log.v(TAG, "Chose Chicken");
break;
case R.id.fishRBtn:
Log.v(TAG, "Chose Fish");
break;
case R.id.stkRBtn:
Log.v(TAG, "Chose Steak");
break;
default:
Log.v(TAG, "Huh?");
break;
}
}});
}
}

You have good example here:
Creating RadioButtons programmatically
or this example also good:
Programmatically-added RadioButtons refuse to obey LayoutParams weighting

Here you have it...
ln = (LinearLayout)findViewById(R.id.Linear_layout); // Assuming linearLayout is your parent layout
RadioGroup rg = new RadioGroup(context); // create the RadioGroup
rg.setLayoutParams(new LinearLayout.LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT, 1f));
cg_Value = new String{“item 1”, “item 2”, “item 3”};
rb = new RadioButton[cg_Value.length];
rg.setOrientation(RadioGroup.HORIZONTAL);// horizontal or vertical depends on requirement
for (int l = 0; l < cg_Value.length; l++) {
rb[l] = new RadioButton(context);
rg.addView(rb[l]); // the RadioButtons are added to
// the radioGroup instead of the
// layout
rb[l].setTextColor(Color.BLACK);
rb[l].setText(cg_Value[l]);
rb[l].setTextSize(14);
}
//rb[1].setChecked(true);
ln.addView(rg);
Hope this helps