问题在于保存滚动时复选框的状态。当我向下滚动或向上滚动时，由于屏幕重绘，某些未检查的项目会被检查。如果有人可以帮忙请。我将提供适配器的代码。
final class ExpAdapter extends CursorTreeAdapter {
private ArrayList<Boolean> itemChecked = new ArrayList<Boolean>();
LayoutInflater mInflator;
CursorTreeAdapter cur;
class ViewHolder {
public TextView textView;
public CheckBox checkbox;
}
public ExpAdapter(Cursor cursor, Context context)
{
super(cursor, context);
mInflator = LayoutInflater.from(context);
}
@Override
protected void bindChildView(View view, Context context, final Cursor cursor,
boolean isLastChild) {
//TextView tvChild = (TextView) view.findViewById(android.R.id.text1);
final TextView tvChild = (TextView) view.findViewById(R.id.label);
tvChild.setText(cursor.getString(cursor
.getColumnIndex(tablename.columname...)));//child
final CheckBox chb = (CheckBox)view.findViewById(R.id.chkbox);
chb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if (buttonView.isChecked()) {
//buttonView.setChecked(true);
buttonView.setChecked(true);
groupcode = mCuror2.getInt(tablename.columname));
levelid = mCuror2.getInt(mCuror2.getColumnIndex(tablename.columname));
levelidarray.add(String.valueOf(levelid));
groupcodearray.add(String.valueOf(groupcode));
String x=(String)tvChild.getText();
array.add(x);
Toast.makeText(getApplicationContext(),""+ array, Toast.LENGTH_SHORT).show();
// do some operations here
}
else
{
buttonView.setChecked(false);
//buttonView.setChecked(false);
//itemChecked.set(cursor.getPosition(), false);
// do some operations here
String x = (String)tvChild.getText();
levelidarray.remove(String.valueOf(levelid));
groupcodearray.remove(String.valueOf(groupcode));
array.remove((String)x);
Toast.makeText(getApplicationContext(),""+ array, Toast.LENGTH_SHORT).show();
}
}
});
}
@Override
protected void bindGroupView(View view, Context context, Cursor cursor, boolean isExpanded)
{
TextView tvGrp = (TextView) view.findViewById(android.R.id.text1);
tvGrp.setText(cursor.getString(cursor
.getColumnIndex(tablename.columname)));
TextView code = (TextView) view.findViewById(android.R.id.text2);
}
@Override
protected Cursor getChildrenCursor(Cursor groupCursor)
{
int groupId = groupCursor.getInt(groupCursor
.getColumnIndex(tablename.columname));
String filter2 = " LEVEL_ID = " +groupId;
mCuror2 = dbconnection....,filter2, null, null, null, null);
return mCuror2;
}
@Override
protected View newChildView(Context context, Cursor cursor,
boolean isLastChild, ViewGroup parent)
{
View mView = mInflator.inflate(R.layout.listviewcheckbox, null);
final TextView tvChild = (TextView) mView.findViewById(R.id.label);
tvChild.setText(cursor.getString(cursor
.getColumnIndex(tablename.columname)));
CheckBox chb = (CheckBox)mView.findViewById(R.id.chkbox);
chb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if (buttonView.isChecked()) {
//buttonView.setChecked(true);
buttonView.setChecked(true);
groupcode = mCuror2.getInt(mCuror2.getColumnIndex(tablename.columname));
levelid = mCuror2.getInt(mCuror2.getColumnIndex(tablename.columname));
levelidarray.add(String.valueOf(levelid));
groupcodearray.add(String.valueOf(groupcode));
String x=(String)tvChild.getText();
array.add(x);
Toast.makeText(getApplicationContext(),""+ array, Toast.LENGTH_SHORT).show();
// do some operations here
}
else
{
buttonView.setChecked(false);
//buttonView.setChecked(false);
//itemChecked.set(cursor.getPosition(), false);
// do some operations here
String x = (String)tvChild.getText();
levelidarray.remove(String.valueOf(levelid));
groupcodearray.remove(String.valueOf(groupcode));
array.remove((String)x);
Toast.makeText(getApplicationContext(),""+ array, Toast.LENGTH_SHORT).show();
}
}
});
return mView;
}
@Override
protected View newGroupView(Context context, Cursor cursor,
boolean isExpanded, ViewGroup parent)
{
View mView = mInflator.inflate(
android.R.layout.simple_expandable_list_item_2, null);
TextView tvGrp = (TextView) mView.findViewById(android.R.id.text1);
tvGrp.setText(cursor.getString(cursor
.getColumnIndex(tablename.columname)));
TextView code = (TextView)mView.findViewById(android.R.id.text2);
code.setText(cursor.getString(cursor.getColumnIndex(tablename.columname)));
return mView;
}
答案 0 :(得分：0)
如果未在数据库中存储已检查状态，则需要设置一个数组以跟踪已检查状态，然后使用该数组在适配器中进行设置。由于您需要组和子位置来引用它，我认为您必须使用getChildView方法而不是bindChildView来执行此操作。
声明一个类变量：
boolean[][] checkedStatus;
在构造函数中填充它：
public ExpAdapter(Cursor cursor, Context context) {
super(cursor, context);
mInflator = LayoutInflater.from(context);
checkedstatus = new boolean[cursor.getCount()][]; // initializae the first dimension of array
for (int i=0; i<cursor.getCount(); i++){ // iterate through the group cursor count
cursor.moveToPosition(i);
Cursor childCursor = ... // get the childcursor for group cursor position i
checkedStatus[i] = new boolean[childcursor.getCount()]; // initialize the second dimension of array for group position i
for (int j=0; j<childCursor.getCount(); j++){ // iterate through the childCursor for group position i
checkedStatus[i][j] = false; // initialize the item to not checked for group position i, child position j
}
}
}
然后在getChildView中使用它来设置状态：
CheckBox chb = (CheckBox)mView.findViewById(R.id.chkbox);
if (checkedStatus[groupPosition][childPosition] == true) {
chb.setChecked(true);
} else {
chb.setChecked(false);
}
请务必同时使用onCheckedChanged方法更新数组。
您的另一个选择是将已检查的状态存储在数据库中，然后您可以在bindView中检查该状态，并在更改时将其写入数据库并完成。当然，每次单击复选框时，必须访问数据库以写入/读取更改，因此我通常会避免使用此选项。
答案 1 :(得分：0)
我使用ResourceCursorTreeAdapter，我的解决方案是：
import android.util.SparseArray;
...
/**
* A map of children IDs to selection state.
*/
private final SparseArray<Boolean> mSelectedChildrenMap = new SparseArray<Boolean>();
...
@Override
protected void bindChildView(View view, Context context, Cursor cursor, boolean isLastChild) {
final int _id = cursor.getInt(...); // get ID
Boolean selected;
if (mSelectedChildrenMap.get(_id) == null) {
selected = false;
mSelectedChildrenMap.put(_id, selected);
} else
selected = mSelectedChildrenMap.get(_id);
/*
* Checkbox, you can use "view holder" approach...
*/
CheckBox mCheckBox = (CheckBox) view.findViewById(...);
mCheckBox.setOnCheckedChangeListener(null);
mCheckBox.setChecked(selected);
mCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
mSelectedChildrenMap.put(_id, isChecked);
}// onCheckedChanged()
});
...
}// bindChildView()
...
@Override
public void notifyDataSetChanged(boolean releaseCursors) {
super.notifyDataSetChanged(releaseCursors);
/*
* Only clears the map if releaseCursors == true.
*/
if (releaseCursors)
synchronized (mSelectedChildrenMap) {
mSelectedChildrenMap.clear();
}
}// notifyDataSetChanged()
@Override
public void notifyDataSetInvalidated() {
super.notifyDataSetInvalidated();
/*
* Clears the map.
*/
synchronized (mSelectedChildrenMap) {
mSelectedChildrenMap.clear();
}
}// notifyDataSetInvalidated()
希望它有所帮助： - ）