我正在实现一个 ExpandableListView 并且对于每个组，它显示子项，每个子项都有自己的持续时间，并且该组显示所有子项持续时间的总和。
但是，当我点击一个 child 时，它会显示错误:
Couldn't read row 1, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
而且我没有调用方法 setOnChildClickListener。即使我调用它，当我点击 child 时，当我放置断点时它也不会停止。
这就是问题所在，我找不到错误出在哪里，因为堆栈跟踪没有指向我项目的类，而是指向 android native 的类。我已经尝试在我的代码的每个部分放置断点，但是当我点击一个 child 时，没有达到任何断点。
顺便说一句，我使用ViewHolder 模式来处理 View ，适配器是CursorTreeAdapter
这是我的代码 - 完整的堆栈跟踪在最后:
public class MyClass extends ExpandableListActivity
{
private Cursor mContactsCursor;
private ExpandableListView mExpandableListView;
private Integer mContactId;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.contacts_layout);
mExpandableListView.setOnGroupClickListener(new OnGroupClickListener()
{
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id)
{
mContactId = Integer.parseInt(v.getTag(R.id.contact_name).toString());
return false;
}
});
}
@Override
public void onResume()
{
super.onResume();
mContactsCursor = mController.getContacts();
mExpandableListView.setAdapter(new ContactsExpandableListAdapter(mContactsCursor, this));
}
@Override
public void onPause()
{
super.onPause();
if(!mContactsCursor.isClosed())
mContactsCursor.close();
}
@Override
public void onDestroy()
{
super.onDestroy();
if(!mContactsCursor.isClosed())
mContactsCursor.close();
}
public class ContactsExpandableListAdapter extends CursorTreeAdapter
{
private TextView mContactNameTextView, mContactNumberTextView, mDurationTextView;
public ContactsExpandableListAdapter(Cursor cursor, Context context)
{
super(cursor, context);
}
@Override
protected Cursor getChildrenCursor(Cursor groupCursor)
{
return mController.getContactById(mContactId);
}
@Override
protected View newGroupView(Context context, Cursor cursor, boolean isExpanded, ViewGroup viewGroup)
{
View view = LayoutInflater.from(context).inflate(R.layout.listitem_contacts, viewGroup, false);
ViewHolder viewHolder = new ViewHolder();
viewHolder.contactName = (TextView) view.findViewById(R.id.contact_name);
viewHolder.duration = (TextView) view.findViewById(R.id.duration);
viewHolder.groupIndicator = (ImageView) view.findViewById(R.id.indicator_icon);
viewHolder.contactName.setText(cursor.getString(cursor.getColumnIndex("contact_name")));
// Set the duration to the view
viewHolder.duration.setText(cursor.getString(cursor.getColumnIndex("duration_sum")));
// Set the tags to the view to be used later when the user click the group view.
// These tags are the contact number, contact id and the the view holder object
// to be retrieved when binding the group view
view.setTag(R.id.contact_number, cursor.getString(cursor.getColumnIndex("contact_number")));
view.setTag(R.id.rlt_main, viewHolder);
view.setTag(R.id.contact_name, cursor.getString(cursor.getColumnIndex("contact_id")));
}
return view;
}
@Override
protected View newChildView(Context context, Cursor cursor, boolean isLastChild, ViewGroup viewGroup)
{
View view = LayoutInflater.from(context).inflate(R.layout.listitem_contacts, viewGroup, false);
mContactNumberTextView = (TextView) view.findViewById(R.id.phone_number);
mContactNumberTextView.setText(cursor.getString(cursor.getColumnIndex("contact_name")));
mDurationTextView = (TextView) view.findViewById(R.id.duration);
mDurationTextView.setText(cursor.getString(cursor.getColumnIndex("duration")));
view.setTag(cursor.getString(cursor.getColumnIndex("contact_number")));
return view;
}
@Override
protected void bindGroupView(View view, Context context, Cursor cursor, boolean isExpanded)
{
ViewHolder viewHolder = (ViewHolder) view.getTag(R.id.rlt_main);
// For each view created, make a query to the database based on the contact id.
// This is not very wise to do, but will probably be changed in the future.
Integer contactId = cursor.getInt(cursor.getColumnIndex("contact_id"));
// Check if the current contact id is equal to -1. If yes it means the contact
Cursor currentContactCursor = mFilterByContactController.getContactById(contactId);
// Check if the cursor being retrieved from the database based on the current view cursor
// is major than zero. If yes, it means it has children, so set the indicator icon to this
// view as visible. If not, set the indicator for this view as gone.
if(currentContactCursor != null && currentContactCursor.getCount() > 0)
{
viewHolder.groupIndicator.setVisibility(View.VISIBLE);
viewHolder.groupIndicator.setImageResource(isExpanded ? R.drawable.expander_ic_maximized : R.drawable.expander_ic_minimized);
}
else
{
viewHolder.groupIndicator.setVisibility(View.GONE);
}
if(cursor.getString(cursor.getColumnIndex("contact_name")) == null)
viewHolder.contactName.setText(cursor.getString(cursor.getColumnIndex("contact_number")));
else
viewHolder.contactName.setText(cursor.getString(cursor.getColumnIndex("contact_name")));
// Set the duration to the view
viewHolder.duration.setText(Utils.convertTime(Integer.parseInt(cursor.getString(cursor.getColumnIndex("duration_sum")))));
// Set the tags to the view to be used later when the user click the group view
view.setTag(R.id.contact_number, cursor.getString(cursor.getColumnIndex("contact_number")));
view.setTag(R.id.contact_name, cursor.getString(cursor.getColumnIndex("contact_id")));
if(!currentContactCursor.isClosed())
currentContactCursor.close();
}
}
@Override
protected void bindChildView(View view, Context context, Cursor cursor, boolean expanded)
{
try
{
if(cursor.getString(cursor.getColumnIndex("contact_name")) == null)
{
mContactNameTextView = (TextView) view.findViewById(R.id.contact_name);
mContactNameTextView.setText(cursor.getString(cursor.getColumnIndex("phone_number")));
}
else
{
mContactNumberTextView = (TextView) view.findViewById(R.id.phone_number);
mContactNumberTextView.setText(cursor.getString(cursor.getColumnIndex("contact_number")));
}
mDurationTextView = (TextView) view.findViewById(R.id.duration);
mDurationTextView.setText(cursor.getString(cursor.getColumnIndex("duration")));
}
catch(Exception e)
{
e.printStackTrace();
}
finally
{
if(cursor.isClosed())
cursor.close();
}
}
}
完整堆栈跟踪
07-22 16:47:46.388: E/AndroidRuntime(7718): java.lang.IllegalStateException: Couldn t read row 1, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.database.CursorWindow.nativeGetLong(Native Method)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.database.CursorWindow.getLong(CursorWindow.java:515)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.database.AbstractWindowedCursor.getLong(AbstractWindowedCursor.java:75)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.widget.CursorTreeAdapter$MyCursorHelper.getId(CursorTreeAdapter.java:436)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.widget.CursorTreeAdapter.getChildId(CursorTreeAdapter.java:173)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.widget.ExpandableListConnector.getItemId(ExpandableListConnector.java:427)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.widget.AdapterView.getItemIdAtPosition(AdapterView.java:756)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.widget.AdapterView.setSelectedPositionInt(AdapterView.java:1128)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.widget.AbsListView.onTouchEvent(AbsListView.java:3147)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.View.dispatchTouchEvent(View.java:5541)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1951)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1712)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1957)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1726)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1957)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1726)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1957)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1726)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1957)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1726)
07-22 16:47:46.388: E/AndroidRuntime(7718): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1912)
07-22 16:47:46.388: E/AndroidRuntime(7718): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1371)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.app.Activity.dispatchTouchEvent(Activity.java:2364)
07-22 16:47:46.388: E/AndroidRuntime(7718): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1860)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.View.dispatchPointerEvent(View.java:5721)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:2890)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2466)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.ViewRootImpl.processInputEvents(ViewRootImpl.java:845)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2475)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.os.Handler.dispatchMessage(Handler.java:99)
07-22 16:47:46.388: E/AndroidRuntime(7718): at android.os.Looper.loop(Looper.java:137) 07-22 16:47:46.388: E/AndroidRuntime(7718): at android.app.ActivityThread.main(ActivityThread.java:4424)
07-22 16:47:46.388: E/AndroidRuntime(7718): at java.lang.reflect.Method.invokeNative(Native Method)
07-22 16:47:46.388: E/AndroidRuntime(7718): at java.lang.reflect.Method.invoke(Method.java:511)
07-22 16:47:46.388: E/AndroidRuntime(7718): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-22 16:47:46.388: E/AndroidRuntime(7718): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-22 16:47:46.388: E/AndroidRuntime(7718): at dalvik.system.NativeStart.main(Native Method)
最佳答案
正如@Jens 在评论中提到的:
Is it looking for a row identifier (i.e. BaseColumns#_ID) and not finding it in the cursor? Which columns are you using in mContactsCursor - you haven't forgotten the row id in that?
在所有查询中，必须指定列 _id。这就是导致错误的原因，在我将 _id 列添加到查询后，它起作用了。
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