我在 android recyclerview 适配器中实现了过滤器。但问题是，当我过滤项目时，项目的位置发生了变化。我需要过滤后项目的原始位置？我怎样才能得到它？
这是我的代码：
public class SearchAdapter extends SelectableAdapter<SearchAdapter.ViewHolder> implements Filterable {
static ArrayList<SingleHadishDisplayModel> singleHadishDisplayModels;
ArrayList<SingleHadishDisplayModel> singleHadishDisplayModelsFilter;
public ViewHolder.ClickListener clickListener;
Context context;
public SearchAdapter(ArrayList<SingleHadishDisplayModel> singleHadishDisplayModels) {
this.singleHadishDisplayModelsFilter = singleHadishDisplayModels;
if (singleHadishDisplayModels != null) {
this.singleHadishDisplayModels = new ArrayList<>(singleHadishDisplayModels);
} else {
this.singleHadishDisplayModels = null;
}
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
context = parent.getContext();
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.search_adapter, parent, false);
ViewHolder vh = new ViewHolder(v, clickListener);
return vh;
}
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
holder.topic.setText(singleHadishDisplayModelsFilter.get(position).topic);
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// Contants.clickPos=position;
/*long id = SearchAdapter.getItemId(position);
Toast.makeText(context,Long.toString(id), Toast.LENGTH_SHORT).show();*/
Intent intent = new Intent(context, HadishDetails.class);
context.startActivity(intent);
}
});
}
@Override
public int getItemCount() {
return singleHadishDisplayModelsFilter.size();
}
public long getItemId(int position) {
int itemID;
// orig will be null only if we haven't filtered yet:
if (singleHadishDisplayModels == null) {
itemID = position;
} else {
itemID = singleHadishDisplayModels.indexOf(singleHadishDisplayModels.get(position));
}
return itemID;
}
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults filterResults = new FilterResults();
if (constraint.length() == 0) {
filterResults.values = SearchAdapter.this.singleHadishDisplayModels;
return filterResults;
}
String searchString = constraint.toString().toLowerCase();
List<SingleHadishDisplayModel> filteredList = new ArrayList<>();
filterResults.values = filteredList;
for (SingleHadishDisplayModel tableSelectionDTO : SearchAdapter.this.singleHadishDisplayModels) {
if (tableSelectionDTO.topic.toLowerCase().contains(searchString)) {
filteredList.add(tableSelectionDTO);
}
}
return filterResults;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
SearchAdapter.this.singleHadishDisplayModelsFilter = (ArrayList<SingleHadishDisplayModel>) results.values;
SearchAdapter.this.notifyDataSetChanged();
}
};
return filter;
}
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {
TextView topic;
private ClickListener listener;
public ViewHolder(View itemView, ClickListener clickListener) {
super(itemView);
this.listener = clickListener;
topic = (TextView) itemView.findViewById(R.id.topic_search);
itemView.setOnClickListener(this);
itemView.setOnLongClickListener(this);
}
@Override
public void onClick(View v) {
if (listener != null) {
listener.onItemClicked(getAdapterPosition());
}
}
@Override
public boolean onLongClick(View view) {
if (listener != null) {
return listener.onItemLongClicked(getAdapterPosition());
}
return false;
}
public interface ClickListener {
public void onItemClicked(int position);
public boolean onItemLongClicked(int position);
}
}
}
我的活动：
public class SearchActivity extends AppCompatActivity implements SearchAdapter.ViewHolder.ClickListener {
private RecyclerView mRecyclerView;
public SearchAdapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
ArrayList<SingleHadishDisplayModel> singleHadishDisplayModels;
SingleHadishDisplayModel singleHadishDisplayModel;
int positionClick;
public static final String POST_ID = "postID";
FloatingSearchView floatingSearchView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//floatingSearchView= (FloatingSearchView) findViewById(R.id.floating_search_view);
singleHadishDisplayModels = new ArrayList<SingleHadishDisplayModel>();
singleHadishDisplayModels = Contants.singleHadishDisplayModelsSaved;
mRecyclerView = (RecyclerView) findViewById(R.id.search_reycler);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new SearchAdapter(singleHadishDisplayModels);
mRecyclerView.setAdapter(mAdapter);
/* floatingSearchView.setOnQueryChangeListener(new FloatingSearchView.OnQueryChangeListener() {
@Override
public void onSearchTextChanged(String oldQuery, final String newQuery) {
mAdapter.clearSelection();
mAdapter.getFilter().filter(newQuery);
}
});*/
EditText et = (EditText) findViewById(R.id.search_et);
et.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence cs, int arg1, int arg2,
int arg3) {
// When user changed the Text
SearchActivity.this.mAdapter.getFilter().filter(cs);
Toast.makeText(SearchActivity.this, Integer.toString(arg1), Toast.LENGTH_SHORT).show();
}
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3) {
// TODO Auto-generated method stub
}
public void afterTextChange(Editable arg0) {
// TODO Auto-generated method stub
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
});
}
@Override
public void onItemClicked(int position) {
positionClick = position;
// Intent intent =new Intent(SearchActivity.this,HadishDetails.class);
//startActivity(intent);
// Contants.clickPos=position;
}
@Override
public boolean onItemLongClicked(int position) {
return false;
}
}
使用此代码：
int pos = list.indexOf(arraylist1.get(getAdapterPosition()));
这里
listarrayList试试这个代码.. 将接口制作成适配器来像这样处理点击事件..
OnItemClick onItemClick;
public void setOnItemClick(OnItemClick onItemClick) {
this.onItemClick = onItemClick;
}
public interface OnItemClick {
void getPosition(String data); //pass any data to shared it.
}
bindview 方法更改..
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
holder.topic.setText(singleHadishDisplayModelsFilter.get(position).topic);
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// Contants.clickPos=position;
/*long id = SearchAdapter.getItemId(position);
Toast.makeText(context,Long.toString(id), Toast.LENGTH_SHORT).show();*/
onItemClick.getPosition("your data");
// Intent intent = new Intent(context, HadishDetails.class);
// context.startActivity(intent);
}
});
}
适配器绑定到回收器视图后调用下面的代码..
adpater.setOnItemClick(new RecyclerViewAdpater.OnItemClick() {
@Override
public void getPosition(String data) {
// hear update your value for check into if condition.
Intent intent = new Intent(context, HadishDetails.class);
context.startActivity(intent);
adpater.notifyDataSetChanged();
}
});
旧位置：
@Override
public long getItemId(int position) {
int itemID;
// mOriginalValues will be null only if we haven't filtered yet:
if (mOriginalValues == null)
{
itemID = position;
}
else
{
itemID = mOriginalValues.indexOf(mObjects.get(position));
}
return itemID;
}
这里，
mOriginalValuesmObjectsonItemClick(AdapterView<?> adapterView, View view, int position, long l)int oldPositionAfterFilter = (int) mainAdapter.getItemId(position);
所以，即使在过滤之后，也始终是真实位置：
mainListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position , long l) {
// always the real position even after filtering :
int oldPosition = (int) mainAdapter.getItemId(position);
String filePath = bs_filePathList.get(oldPosition);// always the original string;
bs_fileOptions(filePath);
}
});
这是您获取所选项目索引的最简单答案：
int pos = items.indexOf(adapter.getItem(position)));