过滤来自 RecyclerView Firebase 的数据

Question

我正在尝试在我的操作栏中实现搜索视图，并为此过滤我从Firebase检索到的RecyclerView数据。现在，我正在寻找需要添加到回收器适配器的代码，以便能够过滤检索到的数据。 这就是我将回收器视图添加到我的主活动的方式。

Query query = mRef.orderByChild("city");
// everything else
FirebaseRecyclerAdapter<City, CityViewHolder> firebaseRecyclerAdapter =
new FirebaseRecyclerAdapter<City, CityViewHolder>(
City.class,
R.layout.city_starter,
CityViewHolder.class,
query
) {
@Override
protected void populateViewHolder(CityViewHolder viewHolder, City city, int position) {
viewHolder.setDetails(getApplicationContext(),
city.getCity());
}
// for click of parent item
@Override
public CityViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
CityViewHolder viewHolder = super.onCreateViewHolder(parent, viewType);
viewHolder.setOnClickListener(new CityViewHolder.ClickListener() {
@Override
public void onItemClick(View view, int position) {
//get Data from Firebase
String cCity = getItem(position).getCity();

// pass this data to new activity
Intent secondMainActivity = new Intent(view.getContext(), SecondMainActivity.class);
secondMainActivity.putExtra("city", cCity);
startActivity(secondMainActivity);
}
@Override
public void onItemLongClick(View view, int position) {
// possible to implement another way of interacting for a long click
}
});
return viewHolder;
}
};
// set adapter to recyclerview
mRecyclerView.setAdapter(firebaseRecyclerAdapter);
}

有人能帮忙吗？ 谢谢:)

这是我在寻找解决方案时发现的，但我不明白如何使其适应我的代码：

public void filter(String text) {
items.clear();
if(text.isEmpty()){
items.addAll(itemsCopy);
} else{
text = text.toLowerCase();
for(PhoneBookItem item: itemsCopy){
if(item.name.toLowerCase().contains(text) || item.phone.toLowerCase().contains(text)){
items.add(item);
}
}
}
notifyDataSetChanged();

}

Answer 1

您可以使用android的可过滤界面。

例如，点击此链接

首先implements Filterable您的适配器类。您可以使用与用于存储和显示筛选项目相同类型的另一个数组列表。

实现可筛选接口的方法getFilter()

示例代码...

@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence charSequence) {
String charString = charSequence.toString();
if (charString.isEmpty()) {
contactListFiltered = contactList;
} else {
List<Contact> filteredList = new ArrayList<>();
for (Contact row : contactList) {
// name match condition. this might differ depending on your requirement
// here we are looking for name or phone number match
if (row.getName().toLowerCase().contains(charString.toLowerCase()) || row.getPhone().contains(charSequence)) {
filteredList.add(row);
}
}
contactListFiltered = filteredList;
}
FilterResults filterResults = new FilterResults();
filterResults.values = contactListFiltered;
return filterResults;
}
@Override
protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
contactListFiltered = (ArrayList<Contact>) filterResults.values;
// refresh the list with filtered data
notifyDataSetChanged();
}
};
}

将搜索视图添加到工具栏中。

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
// Associate searchable configuration with the SearchView
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
searchView = (SearchView) menu.findItem(R.id.action_search)
.getActionView();
searchView.setSearchableInfo(searchManager
.getSearchableInfo(getComponentName()));
searchView.setMaxWidth(Integer.MAX_VALUE);
// listening to search query text change
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
// filter recycler view when query submitted
mAdapter.getFilter().filter(query);
return false;
}
@Override
public boolean onQueryTextChange(String query) {
// filter recycler view when text is changed
mAdapter.getFilter().filter(query);
return false;
}
});
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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_search) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onBackPressed() {
// close search view on back button pressed
if (!searchView.isIconified()) {
searchView.setIconified(true);
return;
}
super.onBackPressed();
}