android listview checkbox 选中状态,Android ListView专题之十 checkbox选中的值在翻屏时会跳来跳去...
翻屏前选择了2，3,4,5
翻屏后
向上翻屏，选择的还是2,3,4,5
其实就是红色的地方是关键点，用了一个集合来保存cb的选择状态，其它的关于viewHolder和和inflate的布局什么就不说了
public class ListViewCheckboxActivityextends
Activity implements OnCheckedChangeListener {
private ListView listView;
private
List
Object>> list;
private CheckBox cball;
ListViewAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
listView = (ListView)
findViewById(R.id.lv);
cball = (CheckBox)
findViewById(R.id.cball);
cball.setOnCheckedChangeListener(this);//全选
list = buildList();
adapter = new
ListViewAdapter(this, list);
listView.setAdapter(adapter);
}
private
List
Object>> buildList() {
List
Object>> list = new
ArrayList
Object>>();
for (int i = 0; i
< 20; i++) {
Map map = new
HashMap();
map.put("icon", R.drawable.icon);
map.put("title", "主题" + (i + 1));
list.add(map);
}
return list;
}
class ListViewAdapter extends BaseAdapter {
private Context context;
private
List
Object>> list;
private LayoutInflater
inflater;
private
List checkBoxesStatus;
public ListViewAdapter(Context
context, List
Object>> list) {
super();
this.context =
context;
this.list =
list;
int listsize =
list.size();
checkBoxesStatus = new
ArrayList(listsize);
for(int i =
0;i
checkBoxesStatus.add(false);
}
this.inflater
= LayoutInflater.from(context);
}
public
List
Object>> getList() {
return
list;
}
public
List getCheckBoxesStatus()
{
return
checkBoxesStatus;
}
@Override
public int getCount() {
return
list.size();
}
@Override
public Object getItem(int
position) {
return
list.get(position);
}
@Override
public long getItemId(int
position) {
return
position;
}
@Override
public View getView(final int
position, View convertView, ViewGroup parent) {
ViewHolder
viewHolder = null;
Map map =
list.get(position);
Boolean
checkBoxStatus = checkBoxesStatus.get(position);
if
(convertView == null) {
convertView
= inflater.inflate(R.layout.list_item, null);
viewHolder =
new ViewHolder();
viewHolder.img = (ImageView)
convertView.findViewById(R.id.icon);
viewHolder.tv = (TextView)
convertView.findViewById(R.id.title);
viewHolder.cb = (CheckBox) convertView.findViewById(R.id.cb);
convertView.setTag(viewHolder);
}else{
viewHolder =
(ViewHolder) convertView.getTag();
}
viewHolder.img.setImageResource((Integer) map.get("icon"));
viewHolder.tv.setText((String) map.get("title"));
viewHolder.cb.setId(position);
viewHolder.cb.setChecked(checkBoxStatus);
viewHolder.cb.setOnCheckedChangeListener(new
OnCheckedChangeListener() {
@Override
public void
onCheckedChanged(CompoundButton buttonView, boolean isChecked)
{
checkBoxesStatus.set(buttonView.getId(), isChecked);
notifyDataSetChanged();
}
});
return
convertView;
}
}
static class ViewHolder {
private ImageView img;
private TextView tv;
private CheckBox cb;
}
@Override
public void onCheckedChanged(CompoundButton
buttonView, boolean isChecked){
List checkBoxesStatus =
adapter.getCheckBoxesStatus();
for(int i =
0;i
checkBoxesStatus.set(i, isChecked);
}
adapter.notifyDataSetChanged();
}