在回收者视图中使用领域的最佳实践? [英] Best practices to use realm with a recycler view?
本文介绍了在回收者视图中使用领域的最佳实践?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
你们是否有关于在recyclerview中使用领域的最佳实践? 我知道这是一个普遍的问题，但是我在互联网上什么都没找到.例如，在尝试连续执行简单的颜色更改时遇到很多麻烦.例如，请考虑以下典型用法:
public class User extends RealmObject {
@PrimaryKey
String name;
boolean isSelected;
...
constructor, getter and setters
}
public class UserAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private RealmResults<User> users;
public UserAdapter(RealmResults<User> users) {
this.users = users;
}
...
public void markAsSelected(int position){
// get the old selected user and deselect it
notifyItemChanged(? how do i get the position given my User has no index ?);
// mark as selected the new user at position
}
由于我无法在互联网上找到任何东西，因此遇到了很多问题.我知道这是因为我不知道如何正确使用领域.但是，找到正确的方法本身就是一个挣扎.我阅读了他们的所有文档，但无济于事.
自从我被要求->而不是说我对此有很多问题"时，描述您的问题，我们将尽力为您的理解提供见解和解答./p>
所以我的问题很简单:
我有一个RealmUser:
public class RealmUser extends RealmObject {
@PrimaryKey
private String key;
private String name;
private boolean isSelected;
private boolean editMode;
private RealmList<RealmItemList> lists;
public RealmUser() {}
public RealmUser(String name, RealmList<RealmItemList> lists, boolean isSelected , boolean editMode) {
this.key = UUID.randomUUID().toString();
this.name = name;
this.isSelected = isSelected;
this.editMode = editMode;
if (lists ==null){
this.lists = new RealmList<RealmItemList>();
}else{
this.lists = lists;
}
}
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public boolean isSelected() {
return isSelected;
}
public void setSelected(boolean isSelected) {
this.isSelected = isSelected;
}
public boolean isEditMode() {
return editMode;
}
public void setEditMode(boolean editMode) {
this.editMode = editMode;
}
public RealmList<RealmItemList> getLists() {
return lists;
}
public void setLists(RealmList<RealmItemList> lists) {
this.lists = lists;
}
}
我使用以下命令将其放入RealmResults数组中:
RealmResults users = realm.where(RealmUser.class).findAll();
我将用户数组传递给我的自定义用户适配器:
public class UserAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private RealmResults<RealmUser> users;
public UserAdapter(RealmResults<RealmUser> users) {
this.users = users;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
if(viewType == 1){
View v = inflater.inflate(R.layout.detail_user, parent, false);
return new UserHolder(v);
}else if(viewType == 2){
View v = inflater.inflate(R.layout.edit_user, parent, false);
return new editUserHolder(v);
}else {
return null;
}
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
RealmUser user = users.get(position);
String userName = user.getName();
boolean isSelected = user.isSelected();
if (holder instanceof UserHolder ){
UserHolder uHolder = (UserHolder) holder;
uHolder.userText.setText(userName);
if (isSelected){
uHolder.userContainer.setBackgroundColor(Color.parseColor("#607D8B"));
}
}else if(holder instanceof editUserHolder){
editUserHolder eUserHolder = (editUserHolder) holder;
eUserHolder.userEditContainer.setBackgroundColor(Color.parseColor("#eeeeee"));
}
}
@Override
public int getItemViewType(int position) {
RealmUser user = users.get(position);
if (user.isEditMode()){
return 2;
}else {
return 1;
}
}
@Override
public int getItemCount() {
return users.size();
}
public void markAsSelected(int position, DrawerLayout mDrawerLayout , Toolbar toolbar, Realm realm){
// Here is my problem : How do I get the already selected user asuming there is one in my db and notify the UI that I changed that item.
}
具有自定义的Click Listener:获取使用以下命令单击的recyclerview项:
public class UserClickListener implements RecyclerView.OnItemTouchListener{
public static interface OnItemClickListener{
public void onItemClick(View v, int position);
}
private OnItemClickListener mListener;
private GestureDetector mGestureDetector;
public UserClickListener(Context context, final RecyclerView recyclerView, OnItemClickListener listener)
{
mListener = listener;
mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
View childView = recyclerView.findChildViewUnder(e.getX(), e.getY());
if(childView != null && mListener != null)
{
mListener.onItemClick(childView, recyclerView.getChildPosition(childView));
return true;
}
return false;
}
});
}
@Override
public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {
View childView = view.findChildViewUnder(e.getX(), e.getY());
if(childView != null && mListener != null && mGestureDetector.onTouchEvent(e))
{
mListener.onItemClick(childView, view.getChildPosition(childView));
}
return false;
}
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
}
我使用addOnItemTouchListener将其添加到我的recyclerView中:
mListRecycler.addOnItemTouchListener(new UserClickListener(getActivity(), mListRecycler, new UserClickListener.OnItemClickListener(){
@Override
public void onItemClick(View view, int position)
{
UserAdapter myadapter = (UserAdapter) mListRecycler.getAdapter();
myadapter.markAsSelected(position, mDrawerLayout , mToolbar, realm);
}
}));
解决方案
0.89.0及更高版本的答案
对于最新版本，您应该在realm-android-adapters存储库中使用 RealmRecyclerViewAdapter./a>
版本:
-
使用1.5.0到2.X
-
使用2.1.1到4.X
-
在5.X以上使用3.0.0
旧版本的旧答案:
我根据RealmBaseAdapter的实现制作了RealmRecyclerViewAdapter.
这适用于 v0.89.0和更高版本
public abstract class RealmRecyclerViewAdapter<T extends RealmObject, VH extends RecyclerView.ViewHolder>
extends RecyclerView.Adapter<VH> { //put this in `io.realm`
protected LayoutInflater inflater;
protected OrderedRealmCollection<T> adapterData;
protected Context context;
private final RealmChangeListener listener;
public RealmRecyclerViewAdapter(Context context, OrderedRealmCollection<T> data) {
if (context == null) {
throw new IllegalArgumentException("Context cannot be null");
}
this.context = context;
this.adapterData = data;
this.inflater = LayoutInflater.from(context);
this.listener = new RealmChangeListener<RealmResults<T>>() {
@Override
public void onChange(RealmResults<T> results) {
notifyDataSetChanged();
}
};
if (data != null) {
addListener(data);
}
}
private void addListener(OrderedRealmCollection<T> data) {
if (data instanceof RealmResults) {
RealmResults realmResults = (RealmResults) data;
realmResults.addChangeListener(listener);
} else if (data instanceof RealmList) {
RealmList realmList = (RealmList) data;
realmList.realm.handlerController.addChangeListenerAsWeakReference(listener);
} else {
throw new IllegalArgumentException("RealmCollection not supported: " + data.getClass());
}
}
private void removeListener(OrderedRealmCollection<T> data) {
if (data instanceof RealmResults) {
RealmResults realmResults = (RealmResults) data;
realmResults.removeChangeListener(listener);
} else if (data instanceof RealmList) {
RealmList realmList = (RealmList) data;
realmList.realm.handlerController.removeWeakChangeListener(listener);
} else {
throw new IllegalArgumentException("RealmCollection not supported: " + data.getClass());
}
}
/**
* Returns how many items are in the data set.
*
* @return the number of items.
*/
@Override
public int getItemCount() {
if (adapterData == null) {
return 0;
}
return adapterData.size();
}
/**
* Get the data item associated with the specified position in the data set.
*
* @param position Position of the item whose data we want within the adapter's
* data set.
* @return The data at the specified position.
*/
public T getItem(int position) {
if (adapterData == null) {
return null;
}
return adapterData.get(position);
}
/**
* Get the row id associated with the specified position in the list. Note that item IDs are not stable so you
* cannot rely on the item ID being the same after {@link #notifyDataSetChanged()} or
* {@link #updateData(OrderedRealmCollection)} has been called.
*
* @param position The position of the item within the adapter's data set whose row id we want.
* @return The id of the item at the specified position.
*/
@Override
public long getItemId(int position) {
// TODO: find better solution once we have unique IDs
return position;
}
/**
* Updates the data associated with the Adapter.
*
* Note that RealmResults and RealmLists are "live" views, so they will automatically be updated to reflect the
* latest changes. This will also trigger {@code notifyDataSetChanged()} to be called on the adapter.
*
* This method is therefore only useful if you want to display data based on a new query without replacing the
* adapter.
*
* @param data the new {@link OrderedRealmCollection} to display.
*/
public void updateData(OrderedRealmCollection<T> data) {
if (listener != null) {
if (adapterData != null) {
removeListener(adapterData);
}
if (data != null) {
addListener(data);
}
}
this.adapterData = data;
notifyDataSetChanged();
}
}
这适用于 v0.84.0及更高版本，但比v0.89.0更旧(已针对v0.87.5更新):
public abstract class RealmRecyclerViewAdapter<T extends RealmObject, VH extends RecyclerView.ViewHolder>
extends RecyclerView.Adapter<VH> { //put this in `io.realm`
protected LayoutInflater inflater;
protected RealmResults<T> realmResults;
protected Context context;
private final RealmChangeListener listener;
public RealmRecyclerViewAdapter(Context context, RealmResults<T> realmResults, boolean automaticUpdate) {
if (context == null) {
throw new IllegalArgumentException("Context cannot be null");
}
this.context = context;
this.realmResults = realmResults;
this.inflater = LayoutInflater.from(context);
this.listener = (!automaticUpdate) ? null : new RealmChangeListener() {
@Override
public void onChange() {
notifyDataSetChanged();
}
};
if (listener != null && realmResults != null) {
realmResults.realm.handlerController.addChangeListenerAsWeakReference(listener);
}
}
/**
* Returns how many items are in the data set.
*
* @return count of items.
*/
@Override
public int getItemCount() {
if (realmResults == null) {
return 0;
}
return realmResults.size();
}
/**
* Returns the item associated with the specified position.
*
* @param i index of item whose data we want.
* @return the item at the specified position.
*/
public T getItem(int i) {
if (realmResults == null) {
return null;
}
return realmResults.get(i);
}
/**
* Returns the current ID for an item. Note that item IDs are not stable so you cannot rely on the item ID being the
* same after {@link #notifyDataSetChanged()} or {@link #updateRealmResults(RealmResults)} has been called.
*
* @param i index of item in the adapter.
* @return current item ID.
*/
@Override
public long getItemId(int i) {
// TODO: find better solution once we have unique IDs
return i;
}
/**
* Updates the RealmResults associated to the Adapter. Useful when the query has been changed.
* If the query does not change you might consider using the automaticUpdate feature.
*
* @param queryResults the new RealmResults coming from the new query.
*/
public void updateRealmResults(RealmResults<T> queryResults) {
if (listener != null) {
// Making sure that Adapter is refreshed correctly if new RealmResults come from another Realm
if (this.realmResults != null) {
this.realmResults.realm.removeChangeListener(listener);
}
if (queryResults != null) {
queryResults.realm.addChangeListener(listener);
}
}
this.realmResults = queryResults;
notifyDataSetChanged();
}
public void addChangeListenerAsWeakReference(RealmChangeListener realmChangeListener) {
if(realmResults != null) {
realmResults.realm.handlerController.addChangeListenerAsWeakReference(realmChangeListener);
}
}
}
这是针对大于0.84.0 的版本:
public abstract class RealmRecyclerViewAdapter<T extends RealmObject, VH extends RecyclerView.ViewHolder>
extends RecyclerView.Adapter<VH> { //put this in `io.realm`
protected LayoutInflater inflater;
protected RealmResults<T> realmResults;
protected Context context;
private final RealmChangeListener listener;
public RealmRecyclerViewAdapter(Context context, RealmResults<T> realmResults, boolean automaticUpdate) {
if(context == null) {
throw new IllegalArgumentException("Context cannot be null");
}
this.context = context;
this.realmResults = realmResults;
this.inflater = LayoutInflater.from(context);
this.listener = (!automaticUpdate) ? null : new RealmChangeListener() {
@Override
public void onChange() {
notifyDataSetChanged();
}
};
if(listener != null && realmResults != null) {
realmResults.getRealm()
.addChangeListener(listener);
}
}
@Override
public long getItemId(int i) {
// TODO: find better solution once we have unique IDs
return i;
}
public T getItem(int i) {
if(realmResults == null) {
return null;
}
return realmResults.get(i);
}
public void updateRealmResults(RealmResults<T> queryResults) {
if(listener != null) {
// Making sure that Adapter is refreshed correctly if new RealmResults come from another Realm
if(this.realmResults != null) {
realmResults.getRealm().removeChangeListener(listener);
}
if(queryResults != null) {
queryResults.getRealm().addChangeListener(listener);
}
}
this.realmResults = queryResults;
notifyDataSetChanged();
}
@Override
public int getItemCount() {
if(realmResults == null) {
return 0;
}
return realmResults.size();
}
}
Do you guys have any best practices regarding using realm with a recyclerview ? I know it's generic question but I found nothing on it on the internet. For example I run into a lot of troubles trying to implement a simple color change on a row . For example consider this typical usage:
public class User extends RealmObject {
@PrimaryKey
String name;
boolean isSelected;
...
constructor, getter and setters
}
public class UserAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private RealmResults<User> users;
public UserAdapter(RealmResults<User> users) {
this.users = users;
}
...
public void markAsSelected(int position){
// get the old selected user and deselect it
notifyItemChanged(? how do i get the position given my User has no index ?);
// mark as selected the new user at position
}
I ran into a lot of issues since I couldn't find anything on the internet. I know this is because I don't know how to properly use realm. But finding the right way is a struggle in itself . I read all their documentation but to no avail.
EDIT : Since I was asked to --> Instead of saying "I have a bunch of issues with [that]", describe your issue(s) and we'll try to provide insights and answers to your incomprehensions.
So my problem is simple :
I have a RealmUser :
public class RealmUser extends RealmObject {
@PrimaryKey
private String key;
private String name;
private boolean isSelected;
private boolean editMode;
private RealmList<RealmItemList> lists;
public RealmUser() {}
public RealmUser(String name, RealmList<RealmItemList> lists, boolean isSelected , boolean editMode) {
this.key = UUID.randomUUID().toString();
this.name = name;
this.isSelected = isSelected;
this.editMode = editMode;
if (lists ==null){
this.lists = new RealmList<RealmItemList>();
}else{
this.lists = lists;
}
}
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public boolean isSelected() {
return isSelected;
}
public void setSelected(boolean isSelected) {
this.isSelected = isSelected;
}
public boolean isEditMode() {
return editMode;
}
public void setEditMode(boolean editMode) {
this.editMode = editMode;
}
public RealmList<RealmItemList> getLists() {
return lists;
}
public void setLists(RealmList<RealmItemList> lists) {
this.lists = lists;
}
}
Which I put in a RealmResults array using :
RealmResults users = realm.where(RealmUser.class).findAll();
I pass my user array to my custom user adapter :
public class UserAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private RealmResults<RealmUser> users;
public UserAdapter(RealmResults<RealmUser> users) {
this.users = users;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
if(viewType == 1){
View v = inflater.inflate(R.layout.detail_user, parent, false);
return new UserHolder(v);
}else if(viewType == 2){
View v = inflater.inflate(R.layout.edit_user, parent, false);
return new editUserHolder(v);
}else {
return null;
}
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
RealmUser user = users.get(position);
String userName = user.getName();
boolean isSelected = user.isSelected();
if (holder instanceof UserHolder ){
UserHolder uHolder = (UserHolder) holder;
uHolder.userText.setText(userName);
if (isSelected){
uHolder.userContainer.setBackgroundColor(Color.parseColor("#607D8B"));
}
}else if(holder instanceof editUserHolder){
editUserHolder eUserHolder = (editUserHolder) holder;
eUserHolder.userEditContainer.setBackgroundColor(Color.parseColor("#eeeeee"));
}
}
@Override
public int getItemViewType(int position) {
RealmUser user = users.get(position);
if (user.isEditMode()){
return 2;
}else {
return 1;
}
}
@Override
public int getItemCount() {
return users.size();
}
public void markAsSelected(int position, DrawerLayout mDrawerLayout , Toolbar toolbar, Realm realm){
// Here is my problem : How do I get the already selected user asuming there is one in my db and notify the UI that I changed that item.
}
That has a custom click Listener : that gets recyclerview item that was clicked using :
public class UserClickListener implements RecyclerView.OnItemTouchListener{
public static interface OnItemClickListener{
public void onItemClick(View v, int position);
}
private OnItemClickListener mListener;
private GestureDetector mGestureDetector;
public UserClickListener(Context context, final RecyclerView recyclerView, OnItemClickListener listener)
{
mListener = listener;
mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
View childView = recyclerView.findChildViewUnder(e.getX(), e.getY());
if(childView != null && mListener != null)
{
mListener.onItemClick(childView, recyclerView.getChildPosition(childView));
return true;
}
return false;
}
});
}
@Override
public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {
View childView = view.findChildViewUnder(e.getX(), e.getY());
if(childView != null && mListener != null && mGestureDetector.onTouchEvent(e))
{
mListener.onItemClick(childView, view.getChildPosition(childView));
}
return false;
}
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
}
Which I add to my recyclerView with addOnItemTouchListener :
mListRecycler.addOnItemTouchListener(new UserClickListener(getActivity(), mListRecycler, new UserClickListener.OnItemClickListener(){
@Override
public void onItemClick(View view, int position)
{
UserAdapter myadapter = (UserAdapter) mListRecycler.getAdapter();
myadapter.markAsSelected(position, mDrawerLayout , mToolbar, realm);
}
}));
解决方案
ANSWER FOR 0.89.0 AND ABOVE
For the latest versions, you should use RealmRecyclerViewAdapter in the realm-android-adapters repository.
Versions:
Use 1.5.0 up to 2.X
Use 2.1.1 up to 4.X
Use 3.0.0 above 5.X
OLD ANSWER FOR OLD VERSIONS:
I made this RealmRecyclerViewAdapter based on the implementation of RealmBaseAdapter.
This is for v0.89.0 AND ABOVE
public abstract class RealmRecyclerViewAdapter<T extends RealmObject, VH extends RecyclerView.ViewHolder>
extends RecyclerView.Adapter<VH> { //put this in `io.realm`
protected LayoutInflater inflater;
protected OrderedRealmCollection<T> adapterData;
protected Context context;
private final RealmChangeListener listener;
public RealmRecyclerViewAdapter(Context context, OrderedRealmCollection<T> data) {
if (context == null) {
throw new IllegalArgumentException("Context cannot be null");
}
this.context = context;
this.adapterData = data;
this.inflater = LayoutInflater.from(context);
this.listener = new RealmChangeListener<RealmResults<T>>() {
@Override
public void onChange(RealmResults<T> results) {
notifyDataSetChanged();
}
};
if (data != null) {
addListener(data);
}
}
private void addListener(OrderedRealmCollection<T> data) {
if (data instanceof RealmResults) {
RealmResults realmResults = (RealmResults) data;
realmResults.addChangeListener(listener);
} else if (data instanceof RealmList) {
RealmList realmList = (RealmList) data;
realmList.realm.handlerController.addChangeListenerAsWeakReference(listener);
} else {
throw new IllegalArgumentException("RealmCollection not supported: " + data.getClass());
}
}
private void removeListener(OrderedRealmCollection<T> data) {
if (data instanceof RealmResults) {
RealmResults realmResults = (RealmResults) data;
realmResults.removeChangeListener(listener);
} else if (data instanceof RealmList) {
RealmList realmList = (RealmList) data;
realmList.realm.handlerController.removeWeakChangeListener(listener);
} else {
throw new IllegalArgumentException("RealmCollection not supported: " + data.getClass());
}
}
/**
* Returns how many items are in the data set.
*
* @return the number of items.
*/
@Override
public int getItemCount() {
if (adapterData == null) {
return 0;
}
return adapterData.size();
}
/**
* Get the data item associated with the specified position in the data set.
*
* @param position Position of the item whose data we want within the adapter's
* data set.
* @return The data at the specified position.
*/
public T getItem(int position) {
if (adapterData == null) {
return null;
}
return adapterData.get(position);
}
/**
* Get the row id associated with the specified position in the list. Note that item IDs are not stable so you
* cannot rely on the item ID being the same after {@link #notifyDataSetChanged()} or
* {@link #updateData(OrderedRealmCollection)} has been called.
*
* @param position The position of the item within the adapter's data set whose row id we want.
* @return The id of the item at the specified position.
*/
@Override
public long getItemId(int position) {
// TODO: find better solution once we have unique IDs
return position;
}
/**
* Updates the data associated with the Adapter.
*
* Note that RealmResults and RealmLists are "live" views, so they will automatically be updated to reflect the
* latest changes. This will also trigger {@code notifyDataSetChanged()} to be called on the adapter.
*
* This method is therefore only useful if you want to display data based on a new query without replacing the
* adapter.
*
* @param data the new {@link OrderedRealmCollection} to display.
*/
public void updateData(OrderedRealmCollection<T> data) {
if (listener != null) {
if (adapterData != null) {
removeListener(adapterData);
}
if (data != null) {
addListener(data);
}
}
this.adapterData = data;
notifyDataSetChanged();
}
}
This is for v0.84.0 AND ABOVE, BUT OLDER THAN v0.89.0 (updated for v0.87.5):
public abstract class RealmRecyclerViewAdapter<T extends RealmObject, VH extends RecyclerView.ViewHolder>
extends RecyclerView.Adapter<VH> { //put this in `io.realm`
protected LayoutInflater inflater;
protected RealmResults<T> realmResults;
protected Context context;
private final RealmChangeListener listener;
public RealmRecyclerViewAdapter(Context context, RealmResults<T> realmResults, boolean automaticUpdate) {
if (context == null) {
throw new IllegalArgumentException("Context cannot be null");
}
this.context = context;
this.realmResults = realmResults;
this.inflater = LayoutInflater.from(context);
this.listener = (!automaticUpdate) ? null : new RealmChangeListener() {
@Override
public void onChange() {
notifyDataSetChanged();
}
};
if (listener != null && realmResults != null) {
realmResults.realm.handlerController.addChangeListenerAsWeakReference(listener);
}
}
/**
* Returns how many items are in the data set.
*
* @return count of items.
*/
@Override
public int getItemCount() {
if (realmResults == null) {
return 0;
}
return realmResults.size();
}
/**
* Returns the item associated with the specified position.
*
* @param i index of item whose data we want.
* @return the item at the specified position.
*/
public T getItem(int i) {
if (realmResults == null) {
return null;
}
return realmResults.get(i);
}
/**
* Returns the current ID for an item. Note that item IDs are not stable so you cannot rely on the item ID being the
* same after {@link #notifyDataSetChanged()} or {@link #updateRealmResults(RealmResults)} has been called.
*
* @param i index of item in the adapter.
* @return current item ID.
*/
@Override
public long getItemId(int i) {
// TODO: find better solution once we have unique IDs
return i;
}
/**
* Updates the RealmResults associated to the Adapter. Useful when the query has been changed.
* If the query does not change you might consider using the automaticUpdate feature.
*
* @param queryResults the new RealmResults coming from the new query.
*/
public void updateRealmResults(RealmResults<T> queryResults) {
if (listener != null) {
// Making sure that Adapter is refreshed correctly if new RealmResults come from another Realm
if (this.realmResults != null) {
this.realmResults.realm.removeChangeListener(listener);
}
if (queryResults != null) {
queryResults.realm.addChangeListener(listener);
}
}
this.realmResults = queryResults;
notifyDataSetChanged();
}
public void addChangeListenerAsWeakReference(RealmChangeListener realmChangeListener) {
if(realmResults != null) {
realmResults.realm.handlerController.addChangeListenerAsWeakReference(realmChangeListener);
}
}
}
This is for OLDER THAN 0.84.0:
public abstract class RealmRecyclerViewAdapter<T extends RealmObject, VH extends RecyclerView.ViewHolder>
extends RecyclerView.Adapter<VH> { //put this in `io.realm`
protected LayoutInflater inflater;
protected RealmResults<T> realmResults;
protected Context context;
private final RealmChangeListener listener;
public RealmRecyclerViewAdapter(Context context, RealmResults<T> realmResults, boolean automaticUpdate) {
if(context == null) {
throw new IllegalArgumentException("Context cannot be null");
}
this.context = context;
this.realmResults = realmResults;
this.inflater = LayoutInflater.from(context);
this.listener = (!automaticUpdate) ? null : new RealmChangeListener() {
@Override
public void onChange() {
notifyDataSetChanged();
}
};
if(listener != null && realmResults != null) {
realmResults.getRealm()
.addChangeListener(listener);
}
}
@Override
public long getItemId(int i) {
// TODO: find better solution once we have unique IDs
return i;
}
public T getItem(int i) {
if(realmResults == null) {
return null;
}
return realmResults.get(i);
}
public void updateRealmResults(RealmResults<T> queryResults) {
if(listener != null) {
// Making sure that Adapter is refreshed correctly if new RealmResults come from another Realm
if(this.realmResults != null) {
realmResults.getRealm().removeChangeListener(listener);
}
if(queryResults != null) {
queryResults.getRealm().addChangeListener(listener);
}
}
this.realmResults = queryResults;
notifyDataSetChanged();
}
@Override
public int getItemCount() {
if(realmResults == null) {
return 0;
}
return realmResults.size();
}
}
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