新问题
我有一个奇怪的问题，这是我第三天拖网StackOverflow和谷歌，寻找一个答案。到目前为止，我只感到头疼:)我还是个新手，所以请原谅这个问题。
我正在创建一个按年、月和类别(如杂货、租金等)汇总支出的应用程序。我希望使用expandableelistview以以下方式显示此数据
Year:2013 ------Total Spent 1,234.56 Total Income: 7,890.11 (this is the group header)
Apr: Spent 4,000.00 ------Recv: 6,0000 (child rows opened on clicking header)
Mar: Spent 3,500.00 ------Recv: 5,0000
Feb: Spent 2,000.00 ------Recv: 4,0000
Jan: Spent 1,500.00 ------Recv: 3,0000
最后，当用户点击这些子元素中的任何一个时，用户将被传送到一个页面，该页面显示了按类别显示的金额。
问题是:有没有一种方法可以显示Year:2013 ------Total Spent 1,234.56 Total Income: 7,890.11
在标题组行?如果是这样，组XML看起来会是什么样子呢?
我尝试了以下作为grouprow头，但应用程序只是在启动时崩溃。我认为在grouprow标题中只能有一个文本项。事实上，即使在xml文件中只描述了一个文本项，即使尝试放置一个相对等布局也会崩溃。
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:gravity="top"
android:layout_height="wrap_content"
android:layout_width="wrap_content" >
<CheckedTextView
android:drawableLeft="@drawable/green_check"
android:gravity="left|top"
android:height="25dp"
android:id="@+id/txtYear"
android:layout_height="wrap_content"
android:layout_weight="3"
android:layout_width="wrap_content"
android:text="Year"
android:textStyle="bold"
android:typeface="sans" />
<TextView
android:gravity="center|center_vertical|top"
android:height="@dimen/activity_horizontal_margin"
android:id="@+id/txtSentAmountYr"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_height="fill_parent"
android:layout_weight="3"
android:layout_width="wrap_content"
android:numeric="decimal"
android:padding="3dp"
android:text="Total Sent"
android:textColor="#442a8d" />
<TextView
android:gravity="center|center_vertical|top"
android:height="25dp"
android:id="@+id/txtRecvdAmountYr"
android:layout_alignBaseline="@+id/txtYear"
android:layout_alignBottom="@+id/txtYear"
android:layout_height="wrap_content"
android:layout_toLeftOf="@+id/txtSentAmountYr"
android:layout_weight="3"
android:layout_width="wrap_content"
android:numeric="decimal"
android:text="Total Received"
android:textColor="#28a928"
android:textStyle="normal"
android:typeface="normal" />
</RelativeLayout>
如果这是不可能的，我正在考虑使用与文本等TableLayout做同样的事情。然而，一个可扩展的列表视图是伟大的视觉和房地产的目的。由于开发的
新问题
我已经设法采纳了Krishna和JFrankie提供的答案。然而，我最终遇到了一组新的问题:(
我有一个类扩展了BaseExpandableListAdapter，这样我就可以修改我的头视图。
正因为如此，我有一个大问题显示数据从数据库中，因为为了从DB检索按照我看到的所有例子，你需要扩展SimpleCursorTreeAdapter。(我不知道你是否可以将你的类扩展为2个不同的类?)
我已经尝试了一个笨拙的解决方案(粘贴在下面)，这是奇迹般地工作，但只返回头组和没有孩子。实际上，它在组中不断重复第一个记录。(我很高兴至少取得了进展)
问题:
。我如何使用BaseExpandableListAdapter和SimpleCursorTreeAdapter在同一适配器?这样我就可以得到我的自定义布局以及从数据库读取我的数据?
b。我已经通过样例即expandableelistview 1和2的谷歌，但对于一个新手只是没有足够的点来连接如何做不同的实现。感谢JFrankie，我学习了他的代码来创建适配器。
这里是自定义适配器
public class ExpandableListViewAdapterCustom extends BaseExpandableListAdapter {
protected Activity currentActivity;
public ExpandableListViewAdapterCustom(Activity callingActivity){
this.currentActivity = callingActivity;
}
private Cursor mGroupsCursorLocal ;
private Cursor mChildCursor;
private Context ctx;
private int groupItem;
private int childItem;
private String[] fieldsToUseFromGroupCursor;
private int[] screenTextsToMapGroupDataTo;
private String[] fieldsToUseFromChildCursor;
private int[] screenTextsToMapChildDataTo;
public ArrayList<String> tempChild;
public LayoutInflater minflater;
public Activity activity;
public int intGroupTotal;
public void setCurrentActivity(Activity activity) {
this.activity = activity;
}
public void setCtx(Context ctx) {
this.ctx = ctx;
}
public void setGroupItem(int groupItem) {
this.groupItem = groupItem;
}
public void setChildItem(int childItem) {
this.childItem = childItem;
}
public Activity getCurrentActivity() {
return currentActivity;
}
public Cursor getmGroupsCursorLocal() {
return mGroupsCursorLocal;
}
public Context getCtx() {
return currentActivity.getBaseContext();
}
public void setmGroupsCursorLocal(Cursor mGroupsCursor) {
this.mGroupsCursorLocal = mGroupsCursor;
}
public ExpandableListViewAdapterCustom(Cursor mGroupsCursor,
Activity activity,
int groupItem,
int childItem,
String[] fieldsToUseFromGroupCursor,
int[] screenTextsToMapGroupDataTo,
String[] fieldsToUseFromChildCursor,
int[] screenTextsToMapChildDataTo) {
DatabaseRoutines db = new DatabaseRoutines(activity);
setmGroupsCursorLocal(mGroupsCursor);
mGroupsCursorLocal = db.fetchGroup();
activity.startManagingCursor (mGroupsCursor);
mGroupsCursorLocal.moveToFirst();
mChildCursor=db.fetchChildren(mGroupsCursorLocal.getColumnIndex("Year"));
mChildCursor.moveToFirst();
activity.startManagingCursor(mChildCursor);
setCtx(activity);
setCurrentActivity(activity);
}
public void setInflater(LayoutInflater mInflater, Activity act) {
this.minflater = mInflater;
activity = act;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return null;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return 0;
}
@Override
public View getChildView(int groupPosition,
int childPosition,boolean
isLastChild,
View convertView,
ViewGroup parent) {
View v = convertView;
if (v == null)
{
LayoutInflater inflater =
(LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.exp_listview_childrow, parent, false);
}
TextView txtMonth = (TextView) v.findViewById(R.id.txtMonth);
TextView txtMonthAmountSent = (TextView)
v.findViewById(R.id.txtMonthAmountSentValue);
TextView txtMonthReceived = (TextView)
v.findViewById(R.id.txtMonthAmountReceivedValue);
txtMonth.setText(mChildCursor.getString(mChildCursor.getColumnIndex("Month")));
txtMonthAmountSent.setText
(mChildCursor.getString(mChildCursor.getColumnIndex("TotalSent")));
txtMonthReceived.setText
(mChildCursor.getString(mChildCursor.getColumnIndex("TotalReceived")));
return v;
}
@Override
public int getChildrenCount(int groupPosition) {
return (mChildCursor.getCount());
}
@Override
public Object getGroup(int groupPosition) {
return null;
}
@Override
public int getGroupCount() {
return mGroupsCursorLocal.getCount();
}
@Override
public void onGroupCollapsed(int groupPosition) {
super.onGroupCollapsed(groupPosition);
}
@Override
public void onGroupExpanded(int groupPosition) {
super.onGroupExpanded(groupPosition);
}
@Override
public long getGroupId(int groupPosition) {
return 0;
}
@Override
public View getGroupView(
int groupPosition,
boolean isExpanded,
View convertView,
ViewGroup parent)
{
View v = convertView;
if (v == null) {
LayoutInflater inflater =
(LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.exp_listview_groupheader, parent, false);
}
TextView txtYear = (TextView) v.findViewById(R.id.txtYearValue);
TextView txtAmountSent = (TextView) v.findViewById(R.id.txtAmountSentValue);
TextView txtAmountRecieved = (TextView)
v.findViewById(R.id.txtAmountReceivedValue);
txtYear.setText(mGroupsCursorLocal.getString(
mGroupsCursorLocal.getColumnIndex("Year")));
txtAmountSent.setText(
mGroupsCursorLocal.getString(mGroupsCursorLocal.getColumnIndex("TotalSent")));
txtAmountRecieved.setText(
GroupsCursorLocal.getString(mGroupsCursorLocal.getColumnIndex("TotalReceived")));
return v;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return false;
}
}
数据库代码是这样的
public Cursor fetchGroup() {
SQLiteDatabase db = this.getReadableDatabase(); //if memory leaks check here
String query = "SELECT DISTINCT MIN(ID) AS id,
Year, SUM(SentAmount) AS TotalSent, SUM(ReceivedAmount) AS TotalReceived
FROM MyTbl GROUP BY Year ORDER BY Year DESC ";
return db.rawQuery(query, null);}
public Cursor fetchChildren(int Yr) {
SQLiteDatabase db = this.getReadableDatabase(); //if memory leaks check here
String query = "SELECT MIN(ID) AS id,
Year, Month, SUM(SentAmount) AS TotalSent,
SUM(ReceivedAmount) AS TotalReceived
FROM MyTbl Where Year= "+ Yr +" GROUP BY Year,
Month ORDER BY Year DESC, Month DESC";
return db.rawQuery(query, null);
}
如果你想创建这样的头部视图
Year:2013 ------Total Spent 1,234.56 Total Income: 7,890.11
在getGroupview
中创建一个扩展BaseExpandableListAdapter的样例类重写方法，使用用户布局的头部和getChildview方法，使用布局的
蔡尔兹。
Note : @Override
public int getGroupCount() {
return Size of Group item;
}
为更好的答案，提供logcat错误…
您是否尝试实现您的自定义适配器并覆盖getGroupView方法并膨胀您的布局?你应该发送日志，这样我们可以试着理解错误。例如
android:layout_toLeftOf="@+id/txtSentAmountYr"
是不正确的…删除'+'，还有在alignBottom等等。如果你想获得一些关于创建自定义可扩展适配器的信息，请查看我的博客