[英]notify* methods doesn't update RecyclerView's view
好吧,我有一個管理聯系人的應用程序,我使用2 RecyclerView
顯示未選中和選中的聯系人。 用戶可以選擇和取消選擇聯系人。
這是我的情況:
我有這兩個RecyclerView
,一個用於管理選定的聯系人,另一個用於管理未選定的聯系人。 當用戶從未選擇的列表中選擇一個聯系人時,該聯系人將從該列表中刪除,並插入到所選列表中。 如果用戶從選定列表中選擇一個聯系人,則只有從該選定列表中刪除該聯系人並將其插入未選定列表中時,才會發生同樣的情況。 我實現了一個自定義RadioButton
並且在onCheckedChanged
事件中, onCheckedChanged
選中還是未選中,我都從相應的適配器中刪除該聯系人。
我有一個用於選定列表的適配器( SelectedContactsAdapter
),還有一個用於未選定列表的適配器( UnselectedContactsAdapter
)。 我使用新的SortedList
集合來管理適配器的數據,並在SortedList
的回調中將更改通知給適配器,並發送回調消息以更新其他適配器。
例如,如果用戶在未選擇的列表中選擇一個聯系人,那么在onCheckedChanged
事件中,我先保存該聯系人,然后再將其從適配器中刪除(這樣做是因為我需要將其傳遞給回調,以便可以將其插入另一個適配器中),然后從適配器中刪除該聯系人。 觸發該onRemoved
所述的方法SortedList
並且有我請notifyItemRemoved(position)
(與position
beign除去的接觸的位置)和插入在所選列表的接觸回調。
由於某種原因,notify *方法不會更新RecyclerView
視圖。 我嘗試使用notifyDataSetChanged
,它可以工作,但對我來說不是一個選擇,因為我需要快速,幾乎即時的更新。
我有2個RecyclerView
用setNestedScrollingEnabled(false)
啟動的,用於FastScroll。 萬一這很重要...
這是我的代碼:
public abstract class FilterableContactsAdapter extends RecyclerView.Adapter<FilterableContactsAdapter.ContactViewHolder>
implements Filterable {
//... Some variables like the filter
protected Contact mLastContactTouched;
protected SortedList<Contact> mFilteredContacts;
protected ContactCallback mContactCallback;
protected boolean mPropagate;
public FilterableContactsAdapter() {
mPropagate = true;
mFilteredContacts = new SortedList<>(Contact.class, new SortedList.Callback<Contact>() {
@Override
public int compare(Contact o1, Contact o2) {
return o1.getName().compareToIgnoreCase(o2.getName());
}
@Override
public void onChanged(int position, int count) {
notifyItemChanged(position);
if(mContactCallback != null && mPropagate) mContactCallback.onContactChanged(mLastContactTouched, position);
}
@Override
public boolean areContentsTheSame(Contact oldItem, Contact newItem) {
boolean sameIds = (oldItem.getId() == newItem.getId());
boolean sameNames = oldItem.getName().equals(newItem.getName());
boolean samePhoneNumbers = oldItem.getNormalizedPhoneNumber().equals(newItem.getNormalizedPhoneNumber());
if(sameIds && sameNames && samePhoneNumbers) return true;
else return false;
}
@Override
public boolean areItemsTheSame(Contact item1, Contact item2) {
return item1.getId() == item2.getId();
}
@Override
public void onInserted(int position, int count) {
notifyItemInserted(position);
/*if(FilterableContactsAdapter.this instanceof SelectedContactsAdapter) notifyDataSetChanged();
else notifyItemInserted(position);*/
if(mContactCallback != null && mPropagate) mContactCallback.onContactInserted(mLastContactTouched, position);
}
@Override
public void onRemoved(int position, int count) {
notifyItemRemoved(position);
/*if(FilterableContactsAdapter.this instanceof SelectedContactsAdapter) notifyDataSetChanged();
else notifyItemRemoved(position);*/
if(mContactCallback != null && mPropagate) mContactCallback.onContactRemoved(mLastContactTouched, position);
}
@Override
public void onMoved(int fromPosition, int toPosition) {
notifyItemMoved(fromPosition, toPosition);
if(mContactCallback != null && mPropagate) mContactCallback.onContactMoved(mLastContactTouched, fromPosition, toPosition);
}
});
}
public void add(Contact contact) {
mFilteredContacts.add(contact);
}
public void remove(Contact contact) {
mFilteredContacts.remove(contact);
}
//... Some other methods like onCreateViewHolder, the ContactViewHolder declaration and the filter implementation
}
public interface ContactCallback {
void onContactInserted(Contact contact, int adapterPosition);
void onContactRemoved(Contact contact, int adapterPosition);
void onContactMoved(Contact contact, int from, int to);
void onContactChanged(Contact contact, int adapterPosition);
}
public class SelectedContactsAdapter extends FilterableContactsAdapter {
@Override
public void onBindViewHolder(final ContactViewHolder holder, final int position) {
final Contact contact = mFilteredContacts.get(position);
if(contact != null) {
holder.parentLayout.setVisibility(View.VISIBLE);
holder.nameTV.setText(contact.getName());
holder.phoneNumberTV.setText(contact.getNormalizedPhoneNumber());
holder.selectCB.setSafeCheck(true, SafeCheckBox.IGNORE);
holder.selectCB.setOnSafeCheckedListener(new SafeCheckBox.OnSafeCheckedListener() {
@Override
public void onAlwaysCalledListener(CompoundButton buttonView, boolean isChecked) {
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
contact.setSelected(isChecked);
mLastContactTouched = contact;
remove(contact);
}
});
} else {
holder.parentLayout.setVisibility(View.GONE);
}
}
}
public class UnselectedContactsAdapter extends FilterableContactsAdapter {
@Override
public void onBindViewHolder(final ContactViewHolder holder, final int position) {
final Contact contact = mFilteredContacts.get(position);
if(!contact.isSelected()) {
holder.parentLayout.setVisibility(View.VISIBLE);
holder.nameTV.setText(contact.getName());
holder.phoneNumberTV.setText(contact.getNormalizedPhoneNumber());
holder.selectCB.setSafeCheck(false, SafeCheckBox.IGNORE);
holder.selectCB.setOnSafeCheckedListener(new SafeCheckBox.OnSafeCheckedListener() {
@Override
public void onAlwaysCalledListener(CompoundButton buttonView, boolean isChecked) {
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
contact.setSelected(isChecked);
mLastContactTouched = contact;
remove(contact);
}
});
} else {
holder.parentLayout.setVisibility(View.GONE);
}
}
}
public class ContactsActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// init the views and setup the searchbar
setupMultiContactsPicker();
}
//... Some other stuff like an OnClick implementation and
//other utility methods that only manage visibility of some
//components of the UI like 2 TextViews and a ProgressBar
private void setupMultiContactsPicker() {
final Filter.FilterListener filterListener = new Filter.FilterListener() {
@Override
public void onFilterComplete(int count) {
progressBar.setVisibility(View.GONE);
updateLayout();
}
};
unselectedContactsAdapter = new UnselectedContactsAdapter();
unselectedContactsAdapter.setContactCallback(new ContactCallback() {
@Override
public void onContactInserted(Contact contact, int adapterPosition) {
selectedContactsAdapter.setPropagate(false);
if(selectedContactsAdapter.getItemCount() > 0) selectedContactsAdapter.remove(contact);
selectedContactsAdapter.setPropagate(true);
updateLayout();
}
@Override
public void onContactRemoved(Contact contact, int adapterPosition) {
selectedContactsAdapter.setPropagate(false);
selectedContactsAdapter.add(contact);
selectedContactsAdapter.setPropagate(true);
updateLayout();
}
@Override
public void onContactMoved(Contact contact, int from, int to) {
}
@Override
public void onContactChanged(Contact contact, int adapterPosition) {
}
});
unselectedContacsRV.setVisibility(View.VISIBLE);
LinearLayoutManager uLayoutManager = new LinearLayoutManager(ContactsActivity.this, LinearLayoutManager.VERTICAL, false);
unselectedContacsRV.setLayoutManager(uLayoutManager);
unselectedContacsRV.setAdapter(unselectedContactsAdapter);
unselectedContacsRV.setHasFixedSize(true);
// Initisialize the adapter with the correct contacts (ContactsFilter.UNSELECTED)
unselectedContactsAdapter.getFilter().filter(FilterableContactsAdapter.ContactsFilter.UNSELECTED, new Filter.FilterListener() {
@Override
public void onFilterComplete(int count) {
onLoadFinish(); //This method call updateLayout(); when the 2 filters finish to load data into the adapters.
}
});
selectedContactsAdapter = new SelectedContactsAdapter();
selectedContactsAdapter.setContactCallback(new ContactCallback() {
@Override
public void onContactInserted(Contact contact, int adapterPosition) {
unselectedContactsAdapter.setPropagate(false);
if(unselectedContactsAdapter.getItemCount() > 0) unselectedContactsAdapter.remove(contact);
unselectedContactsAdapter.setPropagate(true);
updateLayout(); // This method show or hide some TextViews that I use as section titles, nothing more
}
@Override
public void onContactRemoved(Contact contact, int adapterPosition) {
unselectedContactsAdapter.setPropagate(false);
unselectedContactsAdapter.add(contact);
unselectedContactsAdapter.setPropagate(true);
updateLayout(); // This method show or hide some TextViews that I use as section titles, nothing more
}
@Override
public void onContactMoved(Contact contact, int from, int to) {
}
@Override
public void onContactChanged(Contact contact, int adapterPosition) {
}
});
LinearLayoutManager sLayoutManager = new LinearLayoutManager(ContactsActivity.this, LinearLayoutManager.VERTICAL, false);
selectedContacsRV.setLayoutManager(sLayoutManager);
selectedContacsRV.setAdapter(selectedContactsAdapter);
selectedContacsRV.setHasFixedSize(true);
// Initisialize the adapter with the correct contacts (ContactsFilter.SELECTED)
selectedContactsAdapter.getFilter().filter(FilterableContactsAdapter.ContactsFilter.SELECTED, new Filter.FilterListener() {
@Override
public void onFilterComplete(int count) {
onLoadFinish();
}
});
}
}
以下是我在談論的一些照片:
我在這里選擇了兩個聯系人(“ Abuela”和“ Adela Zapata”):
好吧,終於在經過一周的研究后,我找到了解決方案... setHasFixedSize(true)
般地,我懷疑setHasFixedSize(true)
與視圖有關,即使項目已更新,也不會調整大小或重新繪制...我刪除之后來自2個適配器配置的那條線都工作得很好...有趣的是,我在提出問題后數小時便找到了解決方案。
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