Android - niestandardowy adapter ListView - usuń Multi Selection - Indexoutofbounds - dlaczego?
Mam niestandardowy widok listy przy użyciu klasy adaptera w celu rozszerzenia ArrayAdapter klasy elementu. Mam możliwość zmiany trybów wyboru NONE, Single i Multi. To wszystko działa dobrze. Próbuję teraz zaimplementować metodę usuwania elementów z widoku listy (i adaptera) z wielokrotnym wyborem w trybie wyboru. Jednak otrzymuję wyjątki IndexOutOFBounds podczas wykonywania jednej z następujących czynności; 1) usuń ostatni element w widoku listy w trybie POJEDYNCZEGO wyboru (Uwaga: wszystko przed usunięciem ostatniego elementu) 2) W trybie wyboru wielokrotnego ponownie nie mogę usunąć ostatniego elementu 3) ponownie w trybie wielokrotnego wyboru Mogę usunąć pojedyncze wybrane elementy przed ostatni element, ale 2 lub więcej selekcji skutkuje błędami indeksu poza granicami.
Dodałem dziennik debugowania, aby pokazać usuwaną pozycję i rozmiar getCheckItemPositions () oraz mojego licznika pętli (np. I), a na koniec tytuł pozycji usuwanego elementu. Jeśli skomentuję rzeczywistą linię listadpter.remove (pozycja), to wyjście dziennika wydaje się wskazywać, że wszystko działa poprawnie. Teraz podejrzewam, że problem należy do mojej metody getView klasy adaptera. Ale mój mózg jest wyczerpany i utknąłem.
MainActivity.class - metoda removeItems wywołana z obiektu widoku przycisku;
private void removeItems() {
final SparseBooleanArray checkedItems = listView.getCheckedItemPositions();
//final long[] checkedItemIds = listView.getCheckedItemIds();
final int checkedItemsCount = checkedItems.size();
Log.d("drp", "Adapter Count is: " + Integer.toString(mMyListViewAdapter.getCount()));
if (checkedItems != null) {
for (int i = checkedItemsCount-1; i >= 0 ; --i) {
// This tells us the item position we are looking at
// --
final int position = checkedItems.keyAt(i);
// This tells us the item status at the above position
// --
final boolean isChecked = checkedItems.valueAt(i);
if (isChecked) {
Item item = mMyListViewAdapter.getItem(position);
Log.d("drp", "removing : " + Integer.toString(position) + " of " +Integer.toString(checkedItemsCount) + "-" + Integer.toString(i) + " - Title: " + mMyListViewAdapter.getItem(position).getTitle());
mMyListViewAdapter.remove(item);
}
}
}
}
Klasa adaptera;
public class MyListViewAdapter extends ArrayAdapter<Item> implements OnItemClickListener{
private LayoutInflater mInflator;
/**
* This is my view holder for getView method so don't need to call
* findViewById all the time which results in speed increase
*/
static class ViewHolder {
public TextView txtTitle;
public TextView txtDescription;
public TextView txtSessionCount;
public ImageView listThumbnailImage;
public ImageView listStatusIndicatorImage;
public InertCheckBox Checkbox;
}
/**
* Constructor from a list of items
*/
public MyListViewAdapter(Context context, List<Item> items) {
super(context, 0, items);
mInflator = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// This is how you would determine if this particular item is checked
// when the view gets created
// --
final ListView lv = (ListView) parent;
final boolean isChecked = lv.isItemChecked(position);
final int selectionMode = lv.getChoiceMode();
// The item we want to get the view for
// --
Item item = getItem(position);
// Re-use the view if possible (recycle)
// --
ViewHolder holder = null;
if (convertView == null) {
convertView = mInflator.inflate(R.layout.listview_row, null);
holder = new ViewHolder();
holder.txtTitle = (TextView) convertView.findViewById(R.id.title);
holder.txtDescription = (TextView) convertView.findViewById(R.id.description);
holder.txtSessionCount = (TextView) convertView.findViewById(R.id.session_count);
holder.listThumbnailImage = (ImageView) convertView.findViewById(R.id.list_image);
holder.listStatusIndicatorImage = (ImageView) convertView.findViewById(R.id.status);
holder.Checkbox = (InertCheckBox) convertView.findViewById(R.id.inertCheckBox);
convertView.setTag(holder);
} else {
holder = (ViewHolder)convertView.getTag();
}
holder.txtTitle.setText(item.getTitle());
holder.txtDescription.setText(item.getDescription());
holder.txtSessionCount.setText(item.getSessionCount());
holder.listThumbnailImage.setImageBitmap((Bitmap) item.getThumbnailImage());
switch (selectionMode) {
case ListView.CHOICE_MODE_NONE:
holder.Checkbox.setVisibility(InertCheckBox.GONE);
holder.listStatusIndicatorImage.setVisibility(ImageView.VISIBLE);
holder.listStatusIndicatorImage.setImageBitmap((Bitmap) item.getListIndicatorImage());
break;
//case ListView.CHOICE_MODE_SINGLE: case ListView.CHOICE_MODE_MULTIPLE:
default:
holder.listStatusIndicatorImage.setVisibility(ImageView.GONE);
holder.Checkbox.setVisibility(InertCheckBox.VISIBLE);
holder.Checkbox.setButtonDrawable(R.drawable.checkbox);
holder.Checkbox.setChecked(isChecked);
break;
}
return convertView;
}
@Override
public long getItemId(int position) {
return getItem(position).getId();
}
@Override
public boolean hasStableIds() {
return true;
}
I klasa przedmiotów - pierwsza połowa;
public class Item implements Comparable<Item> {
private long id;
private String title;
private String description;
private String session_count;
private Bitmap listImage;
private Bitmap statusImage;
public Item(long id, String title, String description, String session_count, Bitmap listImage, Bitmap statusImage) {
super();
this.id = id;
this.title = title;
this.description = description;
this.session_count = session_count;
this.listImage = listImage;
this.statusImage = statusImage;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getTitle() {
return title;
}
Oto wizualizacja usuwania pozycji śledzenia dzienników debugowania
07-23 22:59:14.910: D/drp(19104): Adapter Count is: 51
07-23 22:59:14.910: D/drp(19104): removing : 50 of 4-3 - Title: Test 50 - testing
07-23 22:59:14.910: D/drp(19104): removing : 49 of 4-2 - Title: Test 49 - testing
07-23 22:59:14.910: D/drp(19104): removing : 48 of 4-1 - Title: Test 48 - testing
Ponownie, jeśli skomentuję „mMyListViewAdapter.remove (element)”; linia w MainActivity nie ulega awarii i log wydaje się wskazywać, że działa zgodnie z oczekiwaniami. Czy ktoś może zobaczyć mój błąd powodujący wyjątek indeksu poza granicami?
Używam także SDK 4.0.4 API 15.
Wielkie dzięki,
Paweł.
Dodawanie - pełne wyjście dziennika
07-25 00:21:53.235: D/AbsListView(25952): Get MotionRecognitionManager
07-25 00:21:53.270: D/dalvikvm(25952): GC_CONCURRENT freed 89K, 3% free 13027K/13383K, paused 1ms+2ms
07-25 00:21:53.430: D/dalvikvm(25952): GC_CONCURRENT freed 207K, 4% free 13232K/13703K, paused 3ms+2ms
07-25 00:21:53.630: D/CLIPBOARD(25952): Hide Clipboard dialog at Starting input: finished by someone else... !
07-25 00:21:54.930: D/dalvikvm(25952): GC_FOR_ALLOC freed 189K, 4% free 13331K/13767K, paused 10ms
07-25 00:21:54.930: I/dalvikvm-heap(25952): Grow heap (frag case) to 13.610MB for 408976-byte allocation
07-25 00:21:54.940: D/dalvikvm(25952): GC_FOR_ALLOC freed 6K, 4% free 13724K/14215K, paused 9ms
07-25 00:21:54.950: D/dalvikvm(25952): GC_FOR_ALLOC freed 0K, 4% free 13724K/14215K, paused 9ms
07-25 00:21:54.950: I/dalvikvm-heap(25952): Grow heap (frag case) to 13.994MB for 408976-byte allocation
07-25 00:21:54.960: D/dalvikvm(25952): GC_FOR_ALLOC freed 0K, 4% free 14124K/14663K, paused 9ms
07-25 00:21:54.970: D/dalvikvm(25952): GC_FOR_ALLOC freed 0K, 4% free 14124K/14663K, paused 9ms
07-25 00:21:54.975: I/dalvikvm-heap(25952): Grow heap (frag case) to 14.384MB for 408976-byte allocation
07-25 00:21:54.995: D/dalvikvm(25952): GC_CONCURRENT freed 0K, 4% free 14523K/15111K, paused 1ms+1ms
07-25 00:21:55.005: D/dalvikvm(25952): GC_FOR_ALLOC freed 0K, 4% free 14523K/15111K, paused 9ms
07-25 00:21:55.005: I/dalvikvm-heap(25952): Grow heap (frag case) to 14.774MB for 408976-byte allocation
07-25 00:21:55.020: D/dalvikvm(25952): GC_FOR_ALLOC freed 0K, 5% free 14923K/15559K, paused 9ms
07-25 00:21:55.030: D/dalvikvm(25952): GC_FOR_ALLOC freed <1K, 5% free 14923K/15559K, paused 9ms
07-25 00:21:55.030: I/dalvikvm-heap(25952): Grow heap (frag case) to 15.165MB for 408976-byte allocation
07-25 00:21:55.040: D/dalvikvm(25952): GC_FOR_ALLOC freed 0K, 5% free 15322K/16007K, paused 10ms
07-25 00:21:55.055: D/dalvikvm(25952): GC_FOR_ALLOC freed 0K, 5% free 15722K/16455K, paused 9ms
07-25 00:21:55.110: D/dalvikvm(25952): GC_FOR_ALLOC freed 157K, 5% free 16145K/16903K, paused 9ms
07-25 00:21:56.565: E/SKIA(25952): FimgApiStretch:stretch failed
07-25 00:21:56.690: E/SKIA(25952): FimgApiStretch:stretch failed
07-25 00:21:56.710: E/SKIA(25952): FimgApiStretch:stretch failed
07-25 00:22:00.545: D/drp(25952): Adapter Count is: 51
07-25 00:22:00.545: D/drp(25952): removing : 49 of 2-2 - Title: Test 49 - testing
07-25 00:22:00.545: D/drp(25952): removing : 48 of 2-1 - Title: Test 48 - testing
07-25 00:22:00.545: D/drp(25952): removing : 47 of 2-0 - Title: Test 47 - testing
07-25 00:22:00.550: D/AndroidRuntime(25952): Shutting down VM
07-25 00:22:00.550: W/dalvikvm(25952): threadid=1: thread exiting with uncaught exception (group=0x40c6f1f8)
07-25 00:22:00.560: E/AndroidRuntime(25952): FATAL EXCEPTION: main
07-25 00:22:00.560: E/AndroidRuntime(25952): java.lang.IndexOutOfBoundsException: Invalid index 48, size is 48
07-25 00:22:00.560: E/AndroidRuntime(25952): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
07-25 00:22:00.560: E/AndroidRuntime(25952): at java.util.ArrayList.get(ArrayList.java:304)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.widget.ArrayAdapter.getItem(ArrayAdapter.java:337)
07-25 00:22:00.560: E/AndroidRuntime(25952): at au.drp.mylistview.MyListViewAdapter.getItemId(MyListViewAdapter.java:107)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.widget.AbsListView.confirmCheckedPositionsById(AbsListView.java:5956)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.widget.AbsListView.handleDataChanged(AbsListView.java:5999)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.widget.ListView.layoutChildren(ListView.java:1535)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.widget.AbsListView.onLayout(AbsListView.java:2254)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.view.View.layout(View.java:11467)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.view.ViewGroup.layout(ViewGroup.java:4237)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.widget.RelativeLayout.onLayout(RelativeLayout.java:925)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.view.View.layout(View.java:11467)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.view.ViewGroup.layout(ViewGroup.java:4237)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.widget.FrameLayout.onLayout(FrameLayout.java:431)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.view.View.layout(View.java:11467)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.view.ViewGroup.layout(ViewGroup.java:4237)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1644)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1502)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.widget.LinearLayout.onLayout(LinearLayout.java:1415)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.view.View.layout(View.java:11467)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.view.ViewGroup.layout(ViewGroup.java:4237)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.widget.FrameLayout.onLayout(FrameLayout.java:431)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.view.View.layout(View.java:11467)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.view.ViewGroup.layout(ViewGroup.java:4237)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1721)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2678)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.os.Handler.dispatchMessage(Handler.java:99)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.os.Looper.loop(Looper.java:137)
07-25 00:22:00.560: E/AndroidRuntime(25952): at android.app.ActivityThread.main(ActivityThread.java:4514)
07-25 00:22:00.560: E/AndroidRuntime(25952): at java.lang.reflect.Method.invokeNative(Native Method)
07-25 00:22:00.560: E/AndroidRuntime(25952): at java.lang.reflect.Method.invoke(Method.java:511)
07-25 00:22:00.560: E/AndroidRuntime(25952): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993)
07-25 00:22:00.560: E/AndroidRuntime(25952): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760)