【发布时间】：2012-01-12 06:26:12
【问题描述】：
这真的很奇怪。
当我为 ListView 使用标准 ArrayAdapter 时，调用 setItemChecked 工作正常
但是当使用定制的 ArrayAdapter 时它不会。
原因是什么？这是一个错误吗？还是我错过了什么？
public class Test_Activity extends Activity {
/** Called when the activity is first created. */
private List<Model> list;
private ListView lView;
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
// Create an array of Strings, that will be put to our ListActivity
setContentView(R.layout.main);
lView = (ListView) findViewById(R.id.ListView01);
lView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
list = getModel();
//with this adapter setItemChecked works OK
lView.setAdapter(new ArrayAdapter<Model>(this,
android.R.layout.simple_list_item_multiple_choice, list));
//**************************
//PROBLEM: with this adapter it does not check any items on the screen
// ArrayAdapter<Model> adapter = new Test_Class1(this, list);
// lView.setAdapter(adapter);
}
private List<Model> getModel() {
List<Model> list = new ArrayList<Model>();
list.add(get("0"));
list.add(get("1"));
list.add(get("2"));
list.get(1).setSelected(true);
Model m = list.get(1);
list.add(get("3"));
list.add(get("4"));
list.add(get("5"));
list.add(get("6"));
list.add(get("7"));
// Initially select one of the items
return list;
}
private Model get(String s) {
return new Model(s);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.results_screen_option_menu, menu);
return true;
}
/**
* @category OptionsMenu
*/
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.select_all: {
int size = lView.getAdapter().getCount();
for (int i = 0; i <= size; i++) {
//************************** PROBLEM
lView.setItemChecked(i, true); // selects the item only for standard ArrayAdapter
Log.i("xxx", "looping " + i);
}
}
return true;
case R.id.select_none:
return true;
}
return false;
}
}
//--------------------------------------------- ---------------
public class Test_Class1 extends ArrayAdapter<Model> {
private final List<Model> list;
private final Activity context;
public Test_Class1(Activity context, List<Model> list) {
super(context, R.layout.rowbuttonlayout2, list);
this.context = context;
this.list = list;
}
static class ViewHolder {
protected TextView text;
protected CheckBox checkbox;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = null;
Log.i("xxx", "-> getView " + position);
if (convertView == null) {
LayoutInflater inflator = context.getLayoutInflater();
view = inflator.inflate(R.layout.rowbuttonlayout, null);
final ViewHolder viewHolder = new ViewHolder();
viewHolder.text = (TextView) view.findViewById(R.id.label);
viewHolder.checkbox = (CheckBox) view.findViewById(R.id.check);
viewHolder.checkbox
.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
Model element = (Model) viewHolder.checkbox
.getTag();
Log.i("xxx", "-> onCheckedChanged");
element.setSelected(buttonView.isChecked());
Log.i("xxx", "<- onCheckedChanged");
}
});
view.setTag(viewHolder);
viewHolder.checkbox.setTag(list.get(position));
} else {
view = convertView;
((ViewHolder) view.getTag()).checkbox.setTag(list.get(position));
}
ViewHolder holder = (ViewHolder) view.getTag();
holder.text.setText(list.get(position).getName());
Log.i("xxx", "holder.checkbox.setChecked: " + position);
holder.checkbox.setChecked(list.get(position).isSelected());
Log.i("xxx", "<- getView " + position);
return view;
}
}
【问题讨论】：
标签： android listview android-arrayadapter