I found here and here similar issues, but the problem is slightly different.
In a ListView, I try to put an adapter (extends from base Adapter) which contents checkbox.
List view layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
style="@style/mainLayout"
>
<Button
android:id="@+id/close_cat"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="buttonClick"
android:text="@string/back" />
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
XML of list's elements:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TableLayout
android:id="@+id/blocCheck"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="25px"
android:layout_marginTop="25px"
android:background="@color/black" >
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:baselineAligned="true"
android:paddingLeft="4sp" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1"
android:orientation="horizontal"
android:paddingLeft="20sp" >
<ImageView
android:id="@+id/iv_cat"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/category"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:layout_marginLeft="15dip"
android:text="tfgldkjhglf"
android:textSize="20sp" />
</LinearLayout>
<CheckBox
android:id="@+id/check_cat"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:layout_marginRight="10sp"
android:onClick="MyHandler" />
</TableRow>
</TableLayout>
</LinearLayout>
I set adapter in my view :
list = getListView();
list.setAdapter(new CatAdapter(this, listCat));
My adapter:
public class CatAdapter extends BaseAdapter {
private LayoutInflater mInflater;
private List<CatAdapterObject> mListAppInfo;
private Context mContext;
/**
* Constructor
* @param context
* @param data
* @param resource
* @param from
* @param to
*/
public CatAdapter (Context context, List<CatAdapterObject> list){
mContext = context;
mListAppInfo = list;
mInflater = LayoutInflater.from(mContext);
}
/**
* number of elements
*/
@Override
public int getCount() {
return mListAppInfo.size();
}
/**
* get an item in the list
*/
@Override
public Object getItem (int position){
return mListAppInfo.get(position).getId();
}
/**
* get id of the selected item
*/
@Override
public long getItemId(int position) {
return mListAppInfo.get(position).getId();
}
/**
* get the view
*/
@Override
public View getView (int position, View convertView, ViewGroup parent){
LinearLayout layoutItem;
if (convertView == null) {
layoutItem = (LinearLayout) mInflater.inflate(R.layout.category, parent, false);
} else {
layoutItem = (LinearLayout) convertView;
}
// get the current category
CatAdapterObject entry = mListAppInfo.get(position);
//view setting
TextView category = (TextView) layoutItem.findViewById(R.id.category);
CheckBox cb = (CheckBox) layoutItem.findViewById(R.id.check_cat);
ImageView iv_cat = (ImageView) layoutItem.findViewById(R.id.iv_cat);
//elements setting
category.setText(entry.getName());
//checkbox
cb.setChecked(entry.isChecked());
cb.setTag(position);
//picture
Bitmap icon = Utils.getResizedBitmap(BitmapFactory.decodeResource(mContext.getResources(),entry.getPict()),45,45,true);
iv_cat.setImageBitmap(icon);
return layoutItem;
}
}
When activity is lauched, list is displayed perfectly. I can scroll up/down without any problem. However, when I check one of the checkboxes and scroll down, box which was checked "loose" its check mark and the background color of the latest box in the list changed.
When checking a box, below method is called (In my activity file):
public void MyHandler(View v) {
//クリックされたcheckbox
cb = (CheckBox) v;
Log.d("CHECKBOX","before :"+Utils.implode(",",this.cat_id_list));
//get position in the list
Integer position = Integer.parseInt(cb.getTag().toString());
//instance of the view (list's child)
View o = list.getChildAt(position).findViewById(R.id.blocCheck);
// check if box is checked
if (cb.isChecked()) {
o.setBackgroundResource(R.color.pink);
this.cat_id_list.add(position.toString());
// 背景色を替え、リストから削除
} else {
o.setBackgroundResource(R.color.black);
Collections.sort(this.cat_id_list);
int index = Collections.binarySearch(this.cat_id_list,position.toString());
this.cat_id_list.remove(index);
}
Log.d("CHECKBOX","after :"+Utils.implode(",",this.cat_id_list));
}
There are 8 elements in my list but when I check the "mChildrenCount" of the list, there are only 5 elements.
I just want to save in the "this.cat_id_list" id of elements wich were checked and change background color of selected item.
I would appreciate your help !
In your getView you have to something like this (this code is give you an idea how it will work in your case):
ListView lv = ((ListActivity)context).getListView();
// Containing all check states
SparseBooleanArray sba = lv.getCheckedItemPositions();
CheckBox cb = (CheckBox) convertView.findViewById(R.id.yourcheckbox);
cb.setChecked(false);
if(sba != null)
if(sba.get(position))
cb.setChecked(true);
That said this what you need on the Activity side.
You have make your ListView to multi-selection mode by android:choiceMode in xml or using setChoiceMode. You check box should be non-clickable and non-focusable.
You have to remove your onClick listener on buttons. Whatever you doing in onClick of button, you have to add that logic to the onListItemClick of ListActivtiy.
I too had the same problem. I solved it using the following method.
I created a bean class to set the checked property of checkbox and used ArrayAdapter.
The ArrayAdpater extends the bean class.
Bean Class
public class MCSSCheckState
{
private boolean isChecked;
public boolean getIsChecked()
{
return isChecked;
}
public void setIsChecked(boolean isChecked)
{
this.isChecked = isChecked;
}
}
Java Class
ArrayList<MCSSCheckState> mTitleList = new ArrayList<MCSSCheckState>();
MCSSCheckState check_state=new MCSSCheckState();
check_state.setIsChecked(false);
mTitleList.add(i, check_state);
ListAdapters adapter = new ListAdapters(this,R.id.camTitleTextView, mTitleList);
ListView mListView = (ListView) findViewById(R.id.cameraListView);
mListView.setAdapter(adapter);
Adapter Class
private class ListAdapters extends ArrayAdapter<MCSSCheckState>
{
private ArrayList<MCSSCheckState> items;
private int position;
public ListAdapters(Context context, int textViewResourceId,
ArrayList<MCSSCheckState> mTitleList)
{
super(context, textViewResourceId, mTitleList);
this.items = mTitleList;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
View v = convertView;
this.position = position;
if (v == null)
{
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.camerslistinflater, null);
}
MCSSCheckState o = (MCSSCheckState) items.get(position);
if (o != null)
{
checkBox = (CheckBox) v.findViewById(R.id.checkBox1);
checkBox.setTag(position);
checkBox.setChecked(o.getIsChecked());
checkBox.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
MCSSCheckState obj = (MCSSCheckState) items.get(Integer.parseInt(v.getTag().toString()));
obj.setIsChecked(((CheckBox)v).isChecked());
items.set(Integer.parseInt(v.getTag().toString()), obj);
}
});
}
return v;
});
}
Hope this helps you.
来源：https://stackoverflow.com/questions/8410306/android-checkboxes-in-a-listview-strange-behaviour-of-selected-element