Android - Custom ListView Adapter - Multi Selection entfernen - Indexoutofbounds - warum?
Ich verwende eine benutzerdefinierte Listenansicht mit einer Adapterklasse, um ArrayAdapter einer Item-Klasse zu erweitern. Ich kann zwischen den Auswahlmodi NONE, Single und Multi wählen. Das alles funktioniert gut. Ich versuche jetzt, eine Methode zum Entfernen von Elementen aus der Listenansicht (und dem Adapter) mit Mehrfachauswahl im Mehrfachauswahlmodus zu implementieren. Ich erhalte jedoch IndexOutOFBounds-Ausnahmen, wenn ich eine der folgenden Aktionen ausführe: 1) letzten Eintrag in der Listenansicht im EINZELNEN Auswahlmodus entfernen (Hinweis: alles vor dem letzten Eintrag entfernen ok) 2) Im Mehrfachauswahlmodus kann ich den letzten Eintrag wieder nicht entfernen 3) wieder im Mehrfachauswahlmodus kann ich einzelne ausgewählte Einträge vorher entfernen Das vorletzte Element, 2 oder mehr Auswahlen, führen erneut zu Fehlern aufgrund von Indexüberschreitungen.
Ich habe ein Debug-Protokoll hinzugefügt, um anzuzeigen, dass die Position entfernt wird, und die Größe von getCheckItemPositions () und my for-Schleifenzähler (z. B. i) und schließlich den Elementtitel des zu entfernenden Elements. Wenn ich die aktuelle Zeile listadpter.remove (position) auskommentiere, scheint die Protokollausgabe zu signalisieren, dass alles in Ordnung ist. Daher habe ich den Verdacht, dass das Problem in meine Methode getView der Adapterklasse fällt. Aber mein Gehirn ist erschöpft und ich stecke fest.
MainActivity.class - Methode removeItems, die von einem Schaltflächenansichtsobjekt aufgerufen wird;
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);
}
}
}
}
Adapterklasse;
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;
}
Und Gegenstandsklasse - erste Hälfte;
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;
}
Hier ist die visuelle Darstellung meiner Entfernung von Debug-Protokollverfolgungselementen
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
Nochmals, wenn ich "mMyListViewAdapter.remove (item)" auskommentiere. Zeile in MainActivity stürzt nicht ab und das Protokoll scheint darauf hinzudeuten, dass es wie erwartet funktioniert. Kann jemand meinen Fehler sehen, der zu meiner Ausnahme "Index außerhalb der Grenzen" führt?
Ich verwende auch SDK 4.0.4 API 15.
Danke vielmals,
Paul.
Addition - vollständige Protokollausgabe
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)