我想在我的适配器类中实现一个搜索过滤器(在显示颜色列表的 fragment 类中使用)，但是尽管我设法为更简单的示例做到这一点，但我不知道如何在此类中继续接收一个 json 数组；我想按 colorName 或 colorCode 过滤搜索。
fragment
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();
}
}
}
适配器版本 2
public class ColorListAdapter extends RecyclerView.Adapter implements Filterable {
private JSONArray colorList;
private ArrayList<ArrayList> colorListFiltered = new ArrayList<>();
ArrayList<String> arrNameList = new ArrayList<>();
ArrayList<String> arrCodeList = new ArrayList<>();
ArrayList<String> arrHexList = new ArrayList<>();
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"));
arrNameList.add((json.getJSONObject(i).getString("Name")));
arrCodeList.add((json.getJSONObject(i).getString("ColorCode")));
arrHexList.add((json.getJSONObject(i).getString("HexString")));
colorListFiltered.add(0, arrNameList);
colorListFiltered.add(1, arrCodeList);
colorListFiltered.add(2, arrHexList);
}
}
}
@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(0).get(index).toString());
this.colorCodeText.setText(colorListFiltered.get(1).get(index).toString());
this.imageView.setCardBackgroundColor(Color.parseColor(colorListFiltered.get(2).get(index).toString()));
/*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
ArrayList<ArrayList> arrayLists = new ArrayList<>();
if (constraint.length() == 0) {
//ArrayList<String> arrNameList = new ArrayList<>();
//ArrayList<String> arrCodeList = new ArrayList<>();
//ArrayList<String> arrHexList = new ArrayList<>();
for (int i = 0; i < colorList.length(); i++) {
try {
arrNameList.add(colorList.getJSONObject(i).getString("Name"));
arrCodeList.add(colorList.getJSONObject(i).getString("HexString"));
arrHexList.add(colorList.getJSONObject(i).getString("ColorCode"));
arrayLists.add(0, arrNameList);
arrayLists.add(1, arrCodeList);
arrayLists.add(2, arrHexList);
} catch (JSONException e) {
e.printStackTrace();
}
}
Result.values = arrayLists;
Result.count = arrayLists.size();
return Result;
}
//if(constraint.length() == 0 ){
//Result.values = colorList;
//Result.count = colorList.length();
//return Result;
else {
//ArrayList<String> arrNameList = new ArrayList<>();
//ArrayList<String> arrCodeList = new ArrayList<>();
//ArrayList<String> arrHexList = new ArrayList<>();
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)) {
arrNameList.add(filterableString);
try {
arrCodeList.add(colorList.getJSONObject(i).getString(("ColorCode")));
} catch (JSONException e) {
e.printStackTrace();
}
try {
arrHexList.add(colorList.getJSONObject(i).getString(("HexString")));
} catch (JSONException e) {
e.printStackTrace();
}
arrayLists.add(0, arrNameList);
arrayLists.add(1, arrCodeList);
arrayLists.add(2, arrHexList);
}
}
Result.values = arrayLists;
Result.count = arrayLists.size();
return Result;
}
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
colorListFiltered = (ArrayList<ArrayList>) results.values;
notifyDataSetChanged();
}
}
}
最佳答案
将代码从 get(i) 更改为 getJSONObject(i) ，如下所示并尝试。如果错误仍然存在，那么您需要检查日志并发布日志。
for(int i = 0; i<colorList.length(); i++){
try {
filterableString = ((JSONObject) colorList.getJSONObject(i)).getString("Name");
} catch (JSONException e) {
e.printStackTrace();
}
关于java - 在解析 json 数组的适配器类中实现搜索过滤器(不使用 pojo)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57134956/