【发布时间】：2019-07-24 15:49:15
【问题描述】：
我的问题类似于Implementing Search Filter in Adapter Class which parses a json array (without using pojo) 但我想尝试以不同的方式解决这个问题。我有一个必须根据条件过滤的元素列表，一旦验证了此条件，我想从 json 数组中检索验证它的元素。在此示例中，我根据元素的名称过滤了元素，并且在 setContentValue () 中，我将设置代码和十六进制字符串，仅采用具有该名称的那些元素，否则在过滤期间名称与代码具有不同的索引，并且十六进制字符串。我怎么能那样做？
片段
public class ColorViewFragment extends Fragment {
private RecyclerView recyclerView;
private JSONArray json;
private ColorListAdapter adapter;
private EditText editColor;
@Nullable @Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.color_list, container, false);
this.recyclerView = view.findViewById(R.id.recyclerView);
/*
try {
this.recyclerView.setAdapter(new ColorListAdapter(this.json));
} catch (JSONException e) {
e.printStackTrace();
}
*/
try {
adapter = new ColorListAdapter(json);
} catch (JSONException e) {
e.printStackTrace();
}
recyclerView.setAdapter(adapter);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity());
this.recyclerView.setLayoutManager(layoutManager);
//
editColor = view.findViewById(R.id.editText);
editColor.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
ColorViewFragment.this.adapter.getFilter().filter(s);
}
@Override
public void afterTextChanged(Editable s) {
}
});
return view;
}
public void setJSON(JSONArray newJson){
this.json = newJson;
}
适配器
public class ColorListAdapter extends RecyclerView.Adapter implements Filterable {
private JSONArray colorList;
private List<String> colorListFiltered = new ArrayList<String>();
public ColorListAdapter(JSONArray json) throws JSONException {
super();
if (json != null) {
this.colorList = json;
for (int i=0;i<json.length();i++){
//colorListFiltered.add((colorList.getString(i)));
colorListFiltered.add(json.getJSONObject(i).getString("Name"));
}
}
}
@Override
public Filter getFilter() {
return new colorFilter();
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.fragment_color_view, viewGroup, false);
return new ColorListHolder(view);
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
try {
((ColorListHolder) viewHolder).setContentValue(i);
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public int getItemCount() {
return this.colorListFiltered.size();
}
private class ColorListHolder extends RecyclerView.ViewHolder {
private TextView colorCodeText;
private TextView colorNameText;
private CardView imageView;
public ColorListHolder(@NonNull View itemView) {
super(itemView);
this.colorCodeText = itemView.findViewById(R.id.colorCode_text);
this.colorNameText = itemView.findViewById(R.id.colorName_text);
this.imageView = itemView.findViewById(R.id.colorView);
}
public void setContentValue(int index) throws JSONException {
this.colorNameText.setText(colorListFiltered.get(index));
//this.colorNameText.setText(((JSONObject) colorList.get(index)).getString("Name"));
this.colorCodeText.setText(((JSONObject) colorList.get(index)).getString("ColorCode"));
this.imageView.setCardBackgroundColor(Color.parseColor(((JSONObject) colorList.get(index)).getString("HexString")));
}
}
public class colorFilter extends Filter{
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults Result = new FilterResults();
// if constraint is empty return the original names
if(constraint.length() == 0 ) {
ArrayList<String> arrColorList = new ArrayList<>();
for (int i = 0; i < colorList.length(); i++) {
try {
arrColorList.add(colorList.getJSONObject(i).getString("Name"));
} catch (JSONException e) {
e.printStackTrace();
}
}
Result.values = arrColorList;
Result.count = arrColorList.size();
return Result;
}
/*if(constraint.length() == 0 ){
Result.values = colorList;
Result.count = colorList.length();
return Result;*/
else {
List<String> Filtered_Names = new ArrayList<String>();
String filterString = constraint.toString().toLowerCase();
String filterableString = "";
for (int i = 0; i < colorList.length(); i++) {
try {
filterableString = (colorList.getJSONObject(i)).getString("Name");
} catch (JSONException e) {
e.printStackTrace();
}
if (filterableString.toLowerCase().contains(filterString)) {
Filtered_Names.add(filterableString);
}
}
Result.values = Filtered_Names;
Result.count = Filtered_Names.size();
return Result;
}
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
colorListFiltered = (ArrayList<String>) results.values;
notifyDataSetChanged();
}
}
【问题讨论】：
-
这里有什么问题？过滤不工作？或者它可以但工作错误？
-
感谢您的回答。所以......列表按名称过滤，但是，当我输入名称时，似乎名称被过滤，但每个名称在视图中都有错误的代码和错误的十六进制字符串（使用 parsecolor 着色卡片）。我认为因为在 setContentValue() 中我需要提取名称等于我过滤的值的值。但我不知道如何..我也尝试过stackoverflow.com/questions/57134956/… 但不起作用..