android: Listview with radio button (only one radio button selected when we click on listview Item)

main.xml


<?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" >
   
   
        <ListView
            android:id="@+id/lv1"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:cacheColorHint="#f8f8ff"
            android:divider="#000000"
            android:fadeScrollbars="true"
            android:choiceMode="singleChoice"
            android:fastScrollEnabled="true"
            android:footerDividersEnabled="true"
            android:textFilterEnabled="true"
            android:textStyle="normal" />
       
        <Button  android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="get"
            android:id="@+id/Button01" />
   

</LinearLayout>


list_single_check.xml 


?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:id="@+id/relativeLayout1"
     android:layout_width="fill_parent" android:layout_height="wrap_content"  
     xmlns:android="http://schemas.android.com/apk/res/android">
   
     <LinearLayout android:layout_centerVertical="true"
         android:layout_width="fill_parent" android:layout_height="wrap_content"
         android:layout_alignParentLeft="true"
         android:orientation="vertical" android:gravity="center_vertical">
       
         <TextView android:layout_width="wrap_content"
              android:layout_height="wrap_content" android:id="@+id/tv_MainText"
              android:textAppearance="?android:attr/textAppearanceMedium" />
         <TextView android:layout_width="wrap_content"
              android:layout_height="wrap_content" android:id="@+id/tv_SubText"
              android:textAppearance="?android:attr/textAppearanceSmall" />
     </LinearLayout>

     <RadioButton android:layout_height="wrap_content"
         android:id="@+id/rb_Choice" android:layout_width="wrap_content"  android:layout_centerVertical="true"
         android:layout_alignParentRight="true" android:gravity="center_vertical"
         android:focusable="false"  android:clickable="false"
        ></RadioButton>

HomeActivity

public class HomeActivity extends Activity {

HomeActivity m_this;

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

  

    m_this = this;

    

    //begin init test data

    final ArrayList<HashMap<String, Object>> m_data = new ArrayList<HashMap<String, Object>>();

    

    HashMap<String, Object> map1 = new HashMap<String, Object>();

    map1.put("maintext", "Large text 1");

    map1.put("subtext", "small text 1A");        

    m_data.add(map1);

    

    HashMap<String, Object> map2 = new HashMap<String, Object>();

    map2.put("maintext", "Large text 2");// no small text of this item!

    m_data.add(map2);

    

    HashMap<String, Object> map3 = new HashMap<String, Object>();

    map3.put("maintext", "Large text 3");

    map3.put("subtext", "small text 3");

    m_data.add(map3);

    

    for (HashMap<String, Object> m :m_data) //make data of this view should not be null (hide )

m.put("checked", false);

  //end init data

    

    

    final ListView lv = (ListView) m_this.findViewById(R.id.lv1);

    lv.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

    

    

    final SimpleAdapter adapter = new SimpleAdapter(m_this,

    m_data,

            R.layout.listitem_single_check,

            new String[] {"maintext", "subtext", "checked"}, 

            new int[] {R.id.tv_MainText, R.id.tv_SubText, R.id.rb_Choice}); 

    

    adapter.setViewBinder(new ViewBinder()

{

    public boolean setViewValue(View view, Object data, String textRepresentation)

    {

if (data == null) //if 2nd line text is null, its textview should be hidden 

{

view.setVisibility(View.GONE);

return true;

}

view.setVisibility(View.VISIBLE);

return false;

}

});

    

    // Bind to our new adapter.

    lv.setAdapter(adapter);

    lv.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView<?> arg0, View v, int arg2, long arg3) {

RadioButton rb = (RadioButton) v.findViewById(R.id.rb_Choice);

if (!rb.isChecked()) //OFF->ON

{

for (HashMap<String, Object> m :m_data) //clean previous selected

m.put("checked", false);

m_data.get(arg2).put("checked", true);

adapter.notifyDataSetChanged();

}

}        

});

    

    //show result

    ((Button)m_this.findViewById(R.id.Button01)).setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

int r = -1;

for (int i = 0; i < m_data.size(); i++) //clean previous selected

{

HashMap<String, Object> m = m_data.get(i);

Boolean x = (Boolean) m.get("checked");

if (x == true)

{

r = i;

break; //break, since it's a single choice list

}

}

new AlertDialog.Builder(m_this).setMessage("you selected:"+r).show();

}

});

    

}  

}