Pramod,
The "get field slot from row 0 col -1 failed" should already be familiar
to you.
It's caused by "DISTINCT RoomName" in the query. Since it's an
expression, it produces a column name that is *not* just "RoomName", and
getColumnIndex("RoomName") inside SimpleCursorAdapter gets -1 for column
index, which indicates failure. When this column index is used to
retrieve the value, you get the error message in log you included below.
To fix, assign a name to the expression-based column. You should also
always include _ID in any query you give to Android, as it expects that
to uniquely identify each row.
SELECT _ID, DISTINCT RoomName AS RoomName FROM SwitchTable
Secondly, your getChildrenCursor returns all children rows there are,
which is wrong. You are supposed to run a query that returns children of
the requested group. The group is identified by data at groupCursor's
current position.
So:
- Get the _ID from groupCursor - to determine the group you're supposed
to get the children for.
- Use that _ID value when querying the children table, to only get the
children for that group.
-- Kostya
15.12.2010 8:52, pramod.deore пишет:
Now when I changes cursor as
Cursor groupCursor = sampleDB.rawQuery ("SELECT DISTINCT RoomName FROM
SwitchTable ",null);
then it shows 2 rooms(i.e Hall and study room) but when i click on any
item then it throgh exception . my logact is :
12-15 11:16:56.612: ERROR/CursorWindow(893): Bad request for field
slot 0,-1. numRows = 2, numColumns = 1
12-15 11:16:56.642: DEBUG/AndroidRuntime(893): Shutting down VM
12-15 11:16:56.652: WARN/dalvikvm(893): threadid=3: thread exiting
with uncaught exception (group=0x4001b188)
12-15 11:16:56.663: ERROR/AndroidRuntime(893): Uncaught handler:
thread main exiting due to uncaught exception
12-15 11:16:56.742: ERROR/AndroidRuntime(893):
java.lang.IllegalStateException: get field slot from row 0 col -1
failed
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.database.CursorWindow.getLong_native(Native Method)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.database.CursorWindow.getLong(CursorWindow.java:380)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.database.AbstractWindowedCursor.getLong(AbstractWindowedCursor.java:
108)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.widget.CursorTreeAdapter
$MyCursorHelper.getId(CursorTreeAdapter.java:435)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.widget.CursorTreeAdapter.getGroupId(CursorTreeAdapter.java:
190)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.widget.ExpandableListConnector.getItemId(ExpandableListConnector.java:
422)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.widget.AdapterView.getItemIdAtPosition(AdapterView.java:745)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.widget.AdapterView.setSelectedPositionInt(AdapterView.java:
1081)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.widget.AbsListView.onTouchEvent(AbsListView.java:2061)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.widget.ListView.onTouchEvent(ListView.java:3234)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.view.View.dispatchTouchEvent(View.java:3709)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:852)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
com.android.internal.policy.impl.PhoneWindow
$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:
1107)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.app.Activity.dispatchTouchEvent(Activity.java:2061)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
com.android.internal.policy.impl.PhoneWindow
$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.os.Handler.dispatchMessage(Handler.java:99)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.os.Looper.loop(Looper.java:123)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
android.app.ActivityThread.main(ActivityThread.java:4363)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
java.lang.reflect.Method.invokeNative(Native Method)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
java.lang.reflect.Method.invoke(Method.java:521)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
com.android.internal.os.ZygoteInit
$MethodAndArgsCaller.run(ZygoteInit.java:860)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
12-15 11:16:56.742: ERROR/AndroidRuntime(893): at
dalvik.system.NativeStart.main(Native Method)
On Dec 15, 9:19 am, "pramod.deore"<[email protected]> wrote:
Hi Kostya Thanks for reply.
After changing code like
public class ExpandableList extends ExpandableListActivity
{
private int mGroupIdColumnIndex;
SQLiteDatabase sampleDB = null;
String SAMPLE_DBNAME = "NewHomeAutoDataBase";
String ROOM_TABLE_NAME = "RoomTable";
private final String LOADTYPE_TABLE_NAME = "LoadTable";
String SWITCH_TABLE_NAME = "SwitchTable";
private String mPhoneNumberProjection[] = new String[] {
"RoomName", "SwitchFullName"
};
private ExpandableListAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
sampleDB = this.openOrCreateDatabase(SAMPLE_DBNAME,
MODE_PRIVATE, null);
Cursor groupCursor = sampleDB.rawQuery ("SELECT _id, RoomName,
SwitchFullName FROM SwitchTable ORDER BY RoomName",null);
System.out.println ("#######"+groupCursor.getCount());
// Cache the ID column index
mGroupIdColumnIndex =
groupCursor.getColumnIndexOrThrow("_id");
// Set up our adapter
mAdapter = new MyExpandableListAdapter(groupCursor,
this,
android.R.layout.simple_expandable_list_item_1,
android.R.layout.simple_expandable_list_item_1,
new String[] {"RoomName"}, // Name for group layouts
new int[] {android.R.id.text1},
new String[] {"SwitchFullName"}, // Number for child
layouts
new int[] {android.R.id.text1});
setListAdapter(mAdapter);
}
public class MyExpandableListAdapter extends
SimpleCursorTreeAdapter
{
public MyExpandableListAdapter(Cursor cursor, Context context,
int groupLayout,
int childLayout, String[] groupFrom, int[] groupTo,
String[] childrenFrom,
int[] childrenTo){
super(context, cursor, groupLayout, groupFrom, groupTo,
childLayout, childrenFrom,
childrenTo);
}
@Override
protected Cursor getChildrenCursor(Cursor groupCursor)
{
Cursor groupCursor1 = sampleDB.rawQuery ("SELECT _id,
RoomName, SwitchFullName FROM SwitchTable ORDER BY RoomName",null);
System.out.println ("#######"+groupCursor1.getCount());
return groupCursor1;
}
}
}
It show me the list of room and when I click on any room item then
list of switches appear. But here I have 2 problems:
1. I have a room name as Hall which has 3 switches and second room as
Study room which has 2 switches. But now it shows me Hall 3 times
(because it has 3 switches) and similarly Study room 2 times. I want
it shows Hall only once, I also used DISTINCT for that but it not help
me.
2. In every room it shows all switches means total 5 switches (3
switches from Hall and 2 switches from study room.) I want after
clicking on study room it only shows 2 switches and on clicking on
Hall it shows 3 switches.
Anyone have idea how to achieve this. I think there is problem in
protected Cursor getChildrenCursor(Cursor groupCursor){} method. But I
didn't found it.
Thanks
On Dec 14, 4:32 pm, Kostya Vasilyev<[email protected]> wrote:
Pramod,
Since your data is in a database, you may want to look at:
http://developer.android.com/reference/android/widget/CursorTreeAdapt...
or its "simple" version, which requires less code, since it's driven by
parameters passed into its constructor:
http://developer.android.com/reference/android/widget/SimpleCursorTre...
You can see an example of the latter here:
http://developer.android.com/resources/samples/ApiDemos/src/com/examp...
-- Kostya
14.12.2010 14:09, pramod.deore пишет:
For now I had just paste the code which is given at sample code.
Please give me a suggestion what should I write in this method.
On Dec 14, 4:07 pm, "pramod.deore"<[email protected]> wrote:
Hi I want to display data from database in ExpandableList format. I
have a room table and one switch table I want to display it in
ExpandableList so when I click on room table item then it shows switch
item of that particular room. For this I read code
ExpandableList1.java available in<sdk>/platforms/android-<version>/
samples/...
But still I am facing problem in protected Cursor
getChildrenCursor(Cursor groupCursor) { } method.
Here is my code what should I write into getChildrenCursor.
public class ExpandableList extends ExpandableListActivity
{
private int mGroupIdColumnIndex;
SQLiteDatabase sampleDB = null;
String SAMPLE_DBNAME = "NewHomeAutoDataBase";
String ROOM_TABLE_NAME = "RoomTable";
private final String LOADTYPE_TABLE_NAME = "LoadTable";
String SWITCH_TABLE_NAME = "SwitchTable";
private String mPhoneNumberProjection[] = new String[] {
"RoomName", "SwitchFullName"
};
private ExpandableListAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
sampleDB = this.openOrCreateDatabase(SAMPLE_DBNAME,
MODE_PRIVATE, null);
Cursor groupCursor = sampleDB.rawQuery ("SELECT RoomName,
SwitchFullName FROM SwitchTable ORDER BY RoomName",null);
// Cache the ID column index
mGroupIdColumnIndex =
groupCursor.getColumnIndexOrThrow("RoomName");
// Set up our adapter
mAdapter = new MyExpandableListAdapter(groupCursor,
this,
android.R.layout.simple_expandable_list_item_1,
android.R.layout.simple_expandable_list_item_1,
new String[] {"RoomName"}, // Name for group layouts
new int[] {android.R.id.text1},
new String[] {"SwitchFullName"}, // Number for child
layouts
new int[] {android.R.id.text1});
setListAdapter(mAdapter);
}
public class MyExpandableListAdapter extends
SimpleCursorTreeAdapter {
public MyExpandableListAdapter(Cursor cursor, Context context,
int groupLayout,
int childLayout, String[] groupFrom, int[] groupTo,
String[] childrenFrom,
int[] childrenTo) {
super(context, cursor, groupLayout, groupFrom, groupTo,
childLayout, childrenFrom,
childrenTo);
}
@Override
protected Cursor getChildrenCursor(Cursor groupCursor) {
// Given the group, we return a cursor for all the
children within that group
// Return a cursor that points to this contact's phone
numbers
Uri.Builder builder = People.CONTENT_URI.buildUpon();
ContentUris.appendId(builder,
groupCursor.getLong(mGroupIdColumnIndex));
builder.appendEncodedPath(People.Phones.CONTENT_DIRECTORY);
Uri phoneNumbersUri = builder.build();
// The returned Cursor MUST be managed by us, so we use
Activity's helper
// functionality to manage it for us.
return managedQuery(phoneNumbersUri,
mPhoneNumberProjection, null, null, null);
}
}}
Thanks
--
Kostya Vasilyev -- WiFi Manager + pretty widget --http://kmansoft.wordpress.com
--
Kostya Vasilyev -- WiFi Manager + pretty widget -- http://kmansoft.wordpress.com
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