【发布时间】：2012-04-10 12:05:57
【问题描述】：
现在这是困扰我很长时间的事情。但不知何故，我仍然无法弄清楚如何在使用自定义适配器构建的列表视图中保存复选框的状态。这是我的自定义适配器。任何帮助都感激不尽。谢谢。
public class ListAdapter extends BaseAdapter{ boolean[] itemChecked=new boolean[20]; public String title[]; public String description[]; public Activity context; public LayoutInflater inflater; HttpClient ht = new DefaultHttpClient() public ListAdapter(Activity context,String[] title, String[] description) { super(); for(int i=0;i<itemChecked.length;i++) { itemChecked[i]=false; } this.context = context; this.title = title; this.description = description;
this.inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public static class ViewHolder
{
TextView txtViewTitle;
TextView txtViewDescription;
CheckBox cb;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return title.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
final ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
if(convertView==null)
{
convertView = inflater.inflate(R.layout.custom_list, null);
holder = new ViewHolder();
holder.txtViewTitle = (TextView) convertView.findViewById(R.id.title_text);
holder.txtViewTitle.setTextColor(Color.parseColor("#008ab5"));
holder.txtViewDescription = (TextView) convertView.findViewById(R.id.description_text);
holder.txtViewDescription.setTextColor(Color.parseColor("#008ab5"));
holder.cb=(CheckBox) convertView.findViewById(R.id.cb);
convertView.setTag(holder);
}
else
{
holder=(ViewHolder)convertView.getTag();
}
holder.cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
itemChecked[position] = isChecked;
if(itemChecked[position])
{
holder.cb.setChecked(true);
}
else
{
holder.cb.setChecked(false);
}
boolean sub=isChecked;
}
}
});
boolean item[]=load();
holder.txtViewTitle.setText(title[position]);
holder.txtViewDescription.setText(description[position]);
holder.cb.setChecked( item[position]);
holder.txtViewDescription.setFocusable(false);
holder.txtViewTitle.setFocusable(false);
save(itemChecked);
return convertView;
}
void subscribe(List<NameValuePair> nameValuePairs,boolean sub)
{
if(sub==true)
{
try {
subscription.setEntity(new UrlEncodedFormEntity(nameValuePairs));
ht.execute(subscription);
} catch (UnsupportedEncodingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else
{
if(sub==false)
{
{
try {
unSubscription.setEntity(new UrlEncodedFormEntity(nameValuePairs));
try {
ht.execute(unSubscription);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (UnsupportedEncodingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
}
}
private void save(final boolean[] isChecked) {
SharedPreferences sharedPreferences = context.getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
for(Integer i=0;i<isChecked.length;i++)
{
editor.putBoolean(i.toString(), isChecked[i]);
}
editor.commit();
}
public boolean[] load() {
SharedPreferences sharedPreferences = context.getPreferences(Context.MODE_PRIVATE);
boolean [] reChecked = new boolean[itemChecked.length];
for(Integer i = 0; i < itemChecked.length; i++)
{
reChecked[i] = sharedPreferences.getBoolean(i.toString(), false);
}
return reChecked;
}
}
【问题讨论】：
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这些对你有帮助吗？
标签： android listview checkbox custom-adapter