问题：
回收器查看过滤器不工作
柴宏浚
我使用此解决方案来过滤我的RecyclView。使用该解决方案，我能够在键入时获得结果。但是当我清除搜索小部件时，我没有得到完整的列表，而是得到了空的RecyclView。
这就是我的结果。https://imgur.com/nwyetEd
这是我的适配器
public class ContactsAdapter extends RecyclerView.Adapter<ContactViewHolder> {
private LayoutInflater inflater;
private ContactViewHolder viewHolder;
private ArrayList<Contact> contactsList = new ArrayList<>();
private VolleySingleton volleySingleton;
private ImageLoader imageLoader;
boolean fromMyContacts;
Context context;
public ContactsAdapter(Context context, boolean fromMyContacts){
inflater = LayoutInflater.from(context);
this.context = context;
volleySingleton = VolleySingleton.getsInstance();
imageLoader = volleySingleton.getImageLoader();
this.fromMyContacts = fromMyContacts;
}
public void setContactsList(ArrayList<Contact> contactsList){
this.contactsList = contactsList;
notifyItemRangeChanged(0, contactsList.size());
}
@Override
public ContactViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.contact_list, parent, false);
viewHolder = new ContactViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(ContactViewHolder holder, int position) {
Contact current = contactsList.get(position);
viewHolder.name.setText(current.name);
viewHolder.phone.setText(current.phone);
viewHolder.city.setText(current.location + ", " + current.city);
if(fromMyContacts) {
if (current.verified) {
viewHolder.verified.setImageResource(R.drawable.ic_check_circle);
} else {
viewHolder.verified.setImageResource(R.drawable.ic_cancel);
}
}
String image_url = current.image_url;
if(!image_url.equals("null")){
Picasso.with(context).load(image_url).into(viewHolder.contactIcon);
}else{
viewHolder.contactIcon.setImageResource(R.drawable.contact_icon);
}
}
@Override
public int getItemCount() {
return contactsList.size();
}
public Contact removeItem(int position){
final Contact contacts = contactsList.remove(position);
notifyItemRemoved(position);
return contacts;
}
public void addItem(int position, Contact contactList){
contactsList.add(position, contactList);
notifyItemInserted(position);
}
public void moveItem(int fromPosition, int toPosition){
final Contact contacts = contactsList.remove(fromPosition);
contactsList.add(toPosition, contacts);
notifyItemMoved(fromPosition, toPosition);
}
public void animateTo(List<Contact> contacts){
applyAndAnimateRemovals(contacts);
applyAndAnimateAdditions(contacts);
applyAndAnimateMovedItems(contacts);
}
private void applyAndAnimateRemovals(List<Contact> newModels) {
for (int i = contactsList.size() - 1; i >= 0; i--) {
final Contact model = contactsList.get(i);
if (!newModels.contains(model)) {
removeItem(i);
}
}
}
private void applyAndAnimateAdditions(List<Contact> newModels) {
for (int i = 0, count = newModels.size(); i < count; i++) {
final Contact model = newModels.get(i);
if (!contactsList.contains(model)) {
addItem(i, model);
}
}
}
private void applyAndAnimateMovedItems(List<Contact> newModels) {
for (int toPosition = newModels.size() - 1; toPosition >= 0; toPosition--) {
final Contact model = newModels.get(toPosition);
final int fromPosition = contactsList.indexOf(model);
if (fromPosition >= 0 && fromPosition != toPosition) {
moveItem(fromPosition, toPosition);
}
}
}
}
这是我的Model
public class Contact {
String name;
String phone;
String city;
String location;
Boolean verified;
String image_url;
public Contact(String name, String phone, String city, String location, Boolean verified, String image_url){
this.name = name;
this.phone = phone;
this.city = city;
this.location = location;
this.verified = verified;
this.image_url = image_url;
}
}
这是我使用过滤器的< code >活动
public class MyContactsActivity extends AppCompatActivity implements View.OnClickListener, SearchView.OnQueryTextListener {
private RecyclerView recyclerView;
private ContactsAdapter adapter;
private NetworkChecker networkChecker;
private SessionManager sessionManager;
private AppConfig appConfig;
private RelativeLayout loading, retry;
private Button tryAgain;
AlertHelper alertHelper;
final ArrayList<Contact> contactArrayList = new ArrayList<>();
String url;
DebugHelper debugHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_contacts);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
debugHelper = new DebugHelper();
loading = (RelativeLayout) findViewById(R.id.loadingPanel);
retry = (RelativeLayout) findViewById(R.id.retry);
tryAgain = (Button) findViewById(R.id.tryAgainButton);
tryAgain.setOnClickListener(this);
alertHelper = new AlertHelper(this);
networkChecker = new NetworkChecker(this);
sessionManager = new SessionManager(this);
appConfig = new AppConfig();
String phone = sessionManager.getLoggedInUserPhone();
url = appConfig.getApiUrlForSpecificContacts(phone);
recyclerView = (RecyclerView) findViewById(R.id.contactsView);
adapter = new ContactsAdapter(getApplicationContext(), true);
recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
sendJsonRequest(url);
recyclerView.setAdapter(adapter);
recyclerView.addOnItemTouchListener(
new RecyclerItemClickListener(this, new RecyclerItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
TextView phone = (TextView) view.findViewById(R.id.contact_phone);
TextView name = (TextView) view.findViewById(R.id.contact_name);
Intent i = new Intent(getApplicationContext(), ContactProfileActivity.class);
i.putExtra("selected_user_phone", phone.getText());
i.putExtra("selected_user_name", name.getText());
startActivity(i);
}
})
);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(getApplicationContext(), AddContactActivity.class));
}
});
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
private void sendJsonRequest(String url) {
if (networkChecker.networkAvailable()) {
loading.setVisibility(View.VISIBLE);
RequestQueue requestQueue = VolleySingleton.getsInstance().getmRequestQueue();
StringRequest stringRequest = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
loading.setVisibility(View.GONE);
retry.setVisibility(View.GONE);
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray jsonArray = jsonObject.getJSONArray("contact_info");
if(jsonArray != null){
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject currentContact = jsonArray.getJSONObject(i);
String name = currentContact.getString("name");
String phone = currentContact.getString("phone");
String city = currentContact.getString("city");
String address = currentContact.getString("address");
Boolean verified = currentContact.getBoolean("verified");
String image_url = currentContact.getString("image_url");
Contact contact = new Contact(name, phone, city, address, verified, image_url);
contactArrayList.add(contact);
}
adapter.setContactsList(contactArrayList);
}
else{
alertHelper.displayDialog("No Contacts Found.");
}
}catch (Exception e){
retry.setVisibility(View.VISIBLE);
tryAgain.setClickable(true);
alertHelper.displayDialog(getString(R.string.action_failed_try_again));
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
loading.setVisibility(View.GONE);
retry.setVisibility(View.VISIBLE);
tryAgain.setClickable(true);
if (error instanceof TimeoutError || error instanceof NoConnectionError) {
alertHelper.displayDialog(getString(R.string.connection_failed));
} else {
alertHelper.displayDialog(getString(R.string.action_failed_try_again));
}
}
});
requestQueue.add(stringRequest);
} else {
retry.setVisibility(View.VISIBLE);
tryAgain.setClickable(true);
}
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
return super.onPrepareOptionsMenu(menu);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.contact_list_menu, menu);
debugHelper.L("Search Click Vayo");
final MenuItem item = menu.findItem(R.id.action_search);
final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
searchView.setOnQueryTextListener(this);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
switch (id) {
case android.R.id.home:
onBackPressed();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.tryAgainButton:
sendJsonRequest(url);
break;
}
}
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String query) {
final List<Contact> filteredModelList = filter(contactArrayList, query);
adapter.animateTo(filteredModelList);
recyclerView.scrollToPosition(0);
return true;
}
private List<Contact> filter(List<Contact> models, String query) {
query = query.toLowerCase();
if(query.equals("")) { return contactArrayList; }
final List<Contact> filteredModelList = new ArrayList<>();
for (Contact model : models) {
final String text = model.name.toLowerCase();
if (text.contains(query)) {
filteredModelList.add(model);
}
}
return filteredModelList;
}
有人能帮助我吗？
共有3个答案
孟晋
您需要将您的filter（）方法从您的活动移动到您的适配器。在您的适配器中添加一个附加变量来保存未过滤数据集的副本。在您的情况下，您需要contactsList和CopOfContactsList变量。
按如下方式更改适配器的构造函数:
public class ContactsAdapter extends RecyclerView.Adapter<ContactViewHolder> {
....
private ArrayList<Contact> contactsList = new ArrayList<>();
private ArrayList<Contact> copyOfContactsList = new ArrayList<>();
....
public ContactsAdapter(Context context, ArrayList<Contact> dataSet, boolean fromMyContacts){
...
this.contactsList = dataSet;
copyOfContactsList.addAll(dataSet);
...
}
这是要添加到< code >适配器中的筛选方法:
public void filter(String text) {
if(text.isEmpty()){
contactsList.clear();
contactsList.addAll(copyOfContactsList);
} else{
ArrayList<Contact> result = new ArrayList<>();
text = text.toLowerCase();
for(Contact item: copyOfContactsList){
if(item.getName().toLowerCase().contains(text)){
result.add(item);
}
}
contactsList.clear();
contactsList.addAll(result);
}
notifyDataSetChanged();
}
沈树
他以这种方式定义：
public void setModels(List<ExampleModel> models) {
mModels = new ArrayList<>(models);
}
像他所做的那样初始化。
你的祝福将是：
this.contactsList = new ArrayList<>(contactsList);
双志强
假设contactsList是具有完整触点的var
private List<Contact> filter(List<Contact> models, String query) {
query = query.toLowerCase();
if(query.equals("")) { return contactsList; }
final List<Contact> filteredModelList = new ArrayList<>();
for (Contact model : models) {
final String text = model.name.toLowerCase();
if (text.contains(query)) {
filteredModelList.add(model);
}
}
return filteredModelList;
}
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