我有一个自定义适配器填充我的联系人列表视图。我正在使用db.delete从该视图中删除特定联系人。一旦我的联系人被删除，视图就不会更新。假设我有 ABCD 联系人。当我删除 A 时，当我返回活动时，我的列表视图会填充 BCDBCD。我试过了adaptor.clear。帮助 ！
This is my AddContacts.java
adaptor = new CustomContactAdapter(this); // Adaptor which populates th listview
final ListView favContacts = (ListView) findViewById(R.id.list);
favContacts.setAdapter(adaptor);
queryForContacts();
favContacts.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener()
{
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view,int position, long id) {
// TODO Auto-generated method stub
Log.d(LOG_TAG,"List View Clicked : id ="+id);
ContactDetail myObject = CustomContactAdapter.contacts.get((int) id);
nickname = myObject.nickname;
Log.d(LOG_TAG,"Extracting the nickname ="+nickname);
showDialog(DELETE_CONTACT);
contact_position=position;
Log.d(LOG_TAG, "this is the contact position "+contact_position);
adaptor.clear();
return false;
}
});
}
----------------------------------------------
/**
* Ths method is called to fill UI with contacts fetched from database
* @param mCursor
*/
public void fillChat(Cursor mCursor) {
Log.v(LOG_TAG, "fillChat : " + mCursor.getCount());
boolean hasUpdated = false;
int count = 0;
if (mCursor != null && mCursor.getCount() != 0) {
adaptor.clear();
mCursor.moveToFirst();
while (!mCursor.isAfterLast()) {
Log.d(LOG_TAG, "mCursor " + count++);
if(!mCursor.getString(mCursor
.getColumnIndex(ContactTable.AUTH_NAME)).equals(Config.getAuthUserName()))
{
ContactDetail detail = new ContactDetail(
mCursor.getString(mCursor
.getColumnIndex(ContactTable.AUTH_NAME)),
mCursor.getString(mCursor
.getColumnIndex(ContactTable.NICK_NAME)),
mCursor.getInt(mCursor
.getColumnIndex(ContactTable.CONTACT_STATUS)) ,
mCursor.getString(mCursor
.getColumnIndex(ContactTable.PHOTO_PATH)));
adaptor.add(detail);
}
mCursor.moveToNext();
}
adaptor.notifyDataSetChanged();
mCursor.close();
}
}
----------
//Dialog for 'delete contact'
protected Dialog onCreateDialog(int id) {
switch (id) {
case DELETE_CONTACT: {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setItems(R.array.delete_contact,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
DatabaseUtils.deleteContactFromDB(nickname, mContext);
Log.d(LOG_TAG,"Nickname sent :" +nickname);
CustomContactAdapter.contacts.remove(contact_position);
adaptor.notifyDataSetChanged();
return;
}
});
return builder.create();
}
default:
return null;
}
}
--------------------------
DatabaseUtils.java
public static void deleteContactFromDB(String name, Context context) {
MyDatabaseHelper dbHelper = new MyDatabaseHelper(context);
SQLiteDatabase db = dbHelper.getWritableDatabase();
db.setLocale(Locale.getDefault());
db.setLockingEnabled(true);
//String[] args = {name};
String where = ContactTable.NICK_NAME + "='" + name + "'";
Log.d(LOG_TAG,"printing where :"+where);
int rowsAffected = db.delete(ContactTable.TABLE_NAME,where, null);
Log.d(LOG_TAG, "deleteContact rows affected in contactdb logcat table ="
+ rowsAffected);
db.setLockingEnabled(false);
if (db != null) {
db.close();
}
}
此类是在添加联系人屏幕中填充联系人列表视图的适配器类：CustomContactAdaptor.java
public class CustomContactAdapter extends ArrayAdapter<ContactDetail> {
private LayoutInflater inflater;
private static final String LOG_TAG = "CustomContactAdapter";
private Context mContext;
static ArrayList<ContactDetail> contacts = new ArrayList<ContactDetail>();
// private CreateBitmap createBitmap;
/**
* Adds the specified object at the end of the array.
*/
@Override
public void add(ContactDetail object) {
super.add(object);
contacts.add(object);
}
/**
* Update photo in list view if changed by user
* @param name
* @param nickname
* @param photoLoc
*/
public void updatePhoto(String name,String nickname,String photoLoc){
Iterator<ContactDetail> itr = contacts.iterator();
while(itr.hasNext()){
ContactDetail contact = itr.next();
if(name.equals(contact.name)){
if(photoLoc!=null){
contact.photo = photoLoc;
}
if(nickname!=null){
contact.nickname = nickname;
}
}
}
}
/**
* Constructor
* @param context
*/
public CustomContactAdapter(Context context) {
super(context, R.layout.add_contact_list_item);
// Cache the LayoutInflate to avoid asking for a new one each time.
ArrayList<ContactDetail> contacts = new ArrayList<ContactDetail>();
inflater = LayoutInflater.from(context);
mContext = context;
}
/**
* returns number of contacts in list view
*/
public int getCount() {
return this.contacts.size();
}
/**
* returns list item at particular index
*/
public ContactDetail getItem(int index) {
return contacts.get(index);
}
/**
* returns view for each list view element
*/
@Override
public View getView(int position, View convertView, ViewGroup parent) {
TextView name;
ImageView photo;
TextView nickname;
ContactDetail contact = (ContactDetail) getItem(position);
Log.d(LOG_TAG,"getView name "+contact.name + " photo "+contact.photo);
// if (convertView == null) {
convertView = inflater.inflate(
R.layout.add_contact_list_item, null);
// Find the child views.rss
name = (TextView) convertView.findViewById(R.id.name);
nickname = (TextView) convertView.findViewById(R.id.nickname);
photo = (ImageView) convertView.findViewById(R.id.photo);
// Optimization: Tag the row with it's child views, so we don't have
// to
// call findViewById() later when we reuse the row.
convertView.setTag(new CustomContactViewHolder(name, nickname,photo));
name.setText(contact.name);
nickname.setText(contact.nickname);
if (contact.photo != null && photo != null&& new File(contact.photo).exists()) {
// createBitmap.createRoundedImage(contact.photo,photo,64,63,4, CreateBitmap.ROUNDIMAGE);
Bitmap roundedImage = ImageUtils.getRoundedImage(contact.photo,64,63,4);
photo.setImageBitmap(roundedImage);
// System.gc();
}
return convertView;
}
}