Comment gérer onCheckedChangeListener pour un groupe de boutons personnalisé dans un ListView adaptateur

Il est facile d'adapter ce tutoriel, vous pouvez utiliser un RadioGroup au lieu d'un CheckBox. Soufflet est un exemple(j'ai utilisé un RadioGroup avec 4 RadioButton). Tout d'abord, vous aurez à modifier la Model classe de sorte qu'il peut stocker les nouvelles données:

public class Model {

    String question; //hold the question
    int current = NONE; //hold the answer picked by the user, initial is NONE(see below)
    public static final int NONE = 1000; //No answer selected
    public static final int ANSWER_ONE_SELECTED = 0; //first answer selected
    public static final int ANSWER_TWO_SELECTED = 1; //second answer selected
    public static final int ANSWER_THREE_SELECTED = 2; //third answer selected
    public static final int ANSWER_FOUR_SELECTED = 3; //forth answer selected

    public Model(String question) {
        this.question = question;  
    }

}

Ensuite modifier le getView() méthode pour définir le point de vue selon le modèle:

@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
ViewHolder holder = null;
if (v == null) {
v = inflater.inflate(R.layout.the_row, parent, false);
holder = new ViewHolder(v);
v.setTag(holder);
holder.group
.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group,
int checkedId) {
Integer pos = (Integer) group.getTag(); //To identify the Model object i get from the RadioGroup with getTag()
// an integer representing the actual position 
Model element = list.get(pos);          
switch (checkedId) { //set the Model to hold the answer the user picked
case R.id.answer0:
element.current = Model.ANSWER_ONE_SELECTED;
break;
case R.id.answer1:
element.current = Model.ANSWER_TWO_SELECTED;
break;
case R.id.answer2:
element.current = Model.ANSWER_THREE_SELECTED;
break;
case R.id.answer3:
element.current = Model.ANSWER_FOUR_SELECTED;
break;
default:
element.current = Model.NONE; //Something was wrong set to the default
}
}
});
} else {
holder = (ViewHolder) v.getTag();
}
holder.group.setTag(new Integer(position)); //I passed the current position as a tag
holder.t.setText(list.get(position).question); //Set the question body
if (list.get(position).current != Model.NONE) {
RadioButton r = (RadioButton) holder.group.getChildAt(list
.get(position).current);
r.setChecked(true);
} else {
holder.group.clearCheck(); //This is required because although the Model could have the current 
//position to NONE you could be dealing with a previous row where
//the user already picked an answer. 
}
return v;
}

et puis ViewHolder classe:

class ViewHolder {
TextView t = null;
RadioGroup group;
ViewHolder(View v) {
t = (TextView) v.findViewById(R.id.textView1);
group = (RadioGroup) v.findViewById(R.id.group_me);
}
}

La mise en page xml avec un RadioGroup:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<RadioGroup
android:id="@+id/group_me"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<RadioButton
android:id="@+id/answer0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="false"
android:text="Ans0" />
<RadioButton
android:id="@+id/answer1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="false"
android:text="Ans1" />
<RadioButton
android:id="@+id/answer2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="false"
android:text="Ans2" />
<RadioButton
android:id="@+id/answer3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="false"
android:text="Ans3" />
</RadioGroup>
</LinearLayout>

OriginalL'auteur Luksprog