我无法删除ListView中的对象。我一直在尝试从适配器中删除一个对象，然后调用onDataSetChanged（）;但它似乎从屏幕上删除了该对象。
我可以从数据库中成功删除该对象，但该对象无论如何都会在屏幕上保留。
我相信因为视图没有正确刷新，它允许我继续滑动以关闭列表中的项目并最终导致IndexOutOfBoundsException。
有没有人知道为什么我的ListView无法正确更新？我知道有很多类似于这个的问题，但大多数都将onDataSetChanged（）作为一个解决方案，并且它没有＆＃39;似乎是我的问题。
06-01 19:33:46.734: E/AndroidRuntime(9011): Process: com.example.datetracker, PID: 9011
06-01 19:33:46.734: E/AndroidRuntime(9011): java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
06-01 19:33:46.734: E/AndroidRuntime(9011): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
06-01 19:33:46.734: E/AndroidRuntime(9011): at java.util.ArrayList.get(ArrayList.java:308)
06-01 19:33:46.734: E/AndroidRuntime(9011): at android.widget.ArrayAdapter.getItem(ArrayAdapter.java:337)
06-01 19:33:46.734: E/AndroidRuntime(9011): at com.example.datetracker.MainActivity$1.onDismiss(MainActivity.java:97)
06-01 19:33:46.734: E/AndroidRuntime(9011): at com.example.datetracker.SwipeDismissListViewTouchListener$3.onAnimationEnd(SwipeDismissListViewTouchListener.java:362)
06-01 19:33:46.734: E/AndroidRuntime(9011): at android.animation.ValueAnimator.endAnimation(ValueAnimator.java:1056)
06-01 19:33:46.734: E/AndroidRuntime(9011): at android.animation.ValueAnimator.access$400(ValueAnimator.java:50)
06-01 19:33:46.734: E/AndroidRuntime(9011): at android.animation.ValueAnimator$AnimationHandler.doAnimationFrame(ValueAnimator.java:644)
06-01 19:33:46.734: E/AndroidRuntime(9011): at android.animation.ValueAnimator$AnimationHandler.run(ValueAnimator.java:660)
MainActivity
public class MainActivity extends FragmentActivity implements OnClickListener {
ListView listView;
int lastIndex = -1;
List<Event> lstEvents = new ArrayList<Event>();
// detail view
TextView tvTitle, tvTime, tvDate;
ImageView ivPic;
View vw_master;
boolean _isBack = true;
ImageButton add;
String title;
String date;
String time;
int resId;
Context context;
static final int PICK_CONTACT_REQUEST = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
// // get detail controls
tvTitle = (TextView) findViewById(R.id.textViewTitle);
tvDate = (TextView) findViewById(R.id.textViewDate);
tvTime = (TextView) findViewById(R.id.textViewTime);
ivPic = (ImageView) findViewById(R.id.imageView1);
add = (ImageButton) findViewById(R.id.add);
add.setOnClickListener(this);
// /////////////////////////////DATABASE/////////////////////////////////////////////
DatabaseHandler db = new DatabaseHandler(this);
// /////////////////////////////DATABASE/////////////////////////////////////////////
// ///////////////////////////////LISTVIEW////////////////////////////////////////
// Create the adapter to convert the array to views
EventAdapter adapter = new EventAdapter(this, db.getAllContacts());
// attach adapter to a list view
listView = (ListView) findViewById(R.id.listViewFragment);
listView.setAdapter(adapter);
context = this;
SwipeDismissListViewTouchListener touchListener = new SwipeDismissListViewTouchListener(
listView,
new SwipeDismissListViewTouchListener.DismissCallbacks() {
DatabaseHandler db = new DatabaseHandler(context);
EventAdapter adapter = new EventAdapter(context,
db.getAllContacts());
@Override
public boolean canDismiss(int position) {
return true;
}
@Override
public void onDismiss(ListView listView,
int[] reverseSortedPositions) {
for (int position : reverseSortedPositions) {
adapter.addAll(db.getAllContacts());
db.deleteEvent(adapter.getItem(position));
adapter.remove(adapter.getItem(position));
}
adapter.clear();
adapter.notifyDataSetChanged();
}
});
listView.setOnTouchListener(touchListener);
// Setting this scroll listener is required to ensure that during
// // ListView scrolling,
// // we don't look for swipes.
listView.setOnScrollListener(touchListener.makeScrollListener());
adapter.addAll(db.getAllContacts());
adapter.notifyDataSetChanged();
}
// @Override
// protected void onResume() {
// // TODO Auto-generated method stub
// super.onResume();
// //
// /////////////////////////////DATABASE/////////////////////////////////////////////
// DatabaseHandler db = new DatabaseHandler(this);
// //
// /////////////////////////////DATABASE/////////////////////////////////////////////
//
// super.onResume();
// adapter.swapItems(db.getAllContacts());
// }
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.add:
Intent intent = new Intent(this, CreateActivity.class);
startActivityForResult(intent, 100);
break;
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// /////////////////////////////DATABASE/////////////////////////////////////////////
DatabaseHandler db = new DatabaseHandler(this);
// /////////////////////////////DATABASE/////////////////////////////////////////////
// Create the adapter to convert the array to views
EventAdapter adapter = new EventAdapter(this, db.getAllContacts());
// attach adapter to a list view
listView = (ListView) findViewById(R.id.listViewFragment);
listView.setAdapter(adapter);
if (requestCode == 100) {
if (resultCode == RESULT_OK) {
Bundle b = data.getExtras();
title = b.getString("TITLE");
time = b.getString("TIME");
date = b.getString("DATE");
Bitmap bitmap = b.getParcelable("BITMAP");
// ///CONVERTING A BITMAP TO A BYTE[]
byte[] image = null;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, bos);
image = bos.toByteArray();
// ///////
// /////////////////////////////DATABASE/////////////////////////////////////////////
/**
* CRUD OPERATIONS
*/
Log.e("Insert: ", "Inserting ..");
db.addEvent(new Event((int) Math.floor(Math.random() * 101),
title, time, date, image));
// Reading all contacts
Log.e("Reading: ", "Reading all contacts..");
adapter.addAll(db.getAllContacts());
adapter.notifyDataSetChanged();
// logging all events
for (Event ev : db.getAllContacts()) {
String log = "Id: " + ev.get_Id() + " ,Title: "
+ ev.get_title() + " ,Date: " + ev.get_date()
+ " ,RESOURCEID: " + ev.get_image();
// Writing Contacts to log
Log.e("Name: ", log);
}
// /////////////////////////////DATABASE/////////////////////////////////////////////
}
}
}
}
EventAdapter
public class EventAdapter extends ArrayAdapter<Event> {
private List<Event> events;
// View lookup cache
private static class ViewHolder {
//adding drawable to imageview
ImageView img;
TextView title;
TextView time;
TextView date;
}
public EventAdapter(Context context, List<Event> objects) {
super(context, R.layout.date_detail);
this.events = events;
// TODO Auto-generated constructor stub
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Get the data item for this position
Event event = getItem(position);
// Check if an existing view is being reused, otherwise inflate the view
ViewHolder viewHolder;
if (convertView == null) {
viewHolder = new ViewHolder();
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(R.layout.date_detail, null);
viewHolder.title = (TextView) convertView
.findViewById(R.id.textViewTitle);
viewHolder.time = (TextView) convertView
.findViewById(R.id.textViewTime);
viewHolder.date = (TextView) convertView
.findViewById(R.id.textViewDate);
//adding drawable to imageview
viewHolder.img = (ImageView) convertView
.findViewById(R.id.imageView1);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
// Populate the data into the template view using the data object
viewHolder.title.setText(event._title);
viewHolder.time.setText(event._time);
viewHolder.date.setText(event._date);
//convert from byte array to bitmap
Bitmap bitmap = convertByteArrayToBitmap(event._image);
// CONVERT BITMAP TO DRAWABLE
viewHolder.img.setImageBitmap(bitmap);
// Return the completed view to render on screen
return convertView;
}
public static Bitmap convertByteArrayToBitmap(
byte[] byteArrayToBeCOnvertedIntoBitMap)
{
Bitmap bitmap = BitmapFactory.decodeByteArray(
byteArrayToBeCOnvertedIntoBitMap, 0,
byteArrayToBeCOnvertedIntoBitMap.length);
return bitmap;
}
public void swapItems(List<Event> events) {
this.events = events;
notifyDataSetChanged();
}
}
答案 0 :(得分：0)
通过在swipeDismissViewListener和OnActivityResult中删除以下代码行来解决问题。
DatabaseHandler db = new DatabaseHandler(context);
EventAdapter adapter = new EventAdapter(context, db.getAllContacts());