Listview自定义过滤器在过滤列表中单击错误的项目
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【中文标题】Listview自定义过滤器在过滤列表中单击错误的项目【英文标题】：Listview custom filter gives wrong item on-clicked in filtered list 【发布时间】：2021-04-27 10:29:50 【问题描述】：当我过滤我的列表并单击列表视图中的一个项目时，它会提供错误的项目信息。 假设我的列表包含 X、Y、Z。当我在列表中搜索以 Y 开头的内容时，我会得到 Y，但是当我单击 Y 时，它会返回 X 或任何随机项目数据。 我的主要活动：
public class exit_Activity extends AppCompatActivity
String Show_url = "https://retrieve.php";
ListView removeView;
MyAdapter adapter;
public static ArrayList<Employee> employeeArrayList = new ArrayList<>();
Employee employee;
ProgressBar progressBar;
private SwipeRefreshLayout mSwipeRefreshLayout;
public static ArrayList<Employee> filterList = new ArrayList<>();
EditText search;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_exit_);
retrieveData();
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
///
mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.refreshlayout);
mSwipeRefreshLayout.setColorSchemeResources(R.color.black, R.color.green, R.color.red);
mSwipeRefreshLayout.setProgressBackgroundColorSchemeColor(getResources().getColor(R.color.main_blue));
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener()
@Override
public void onRefresh()
mSwipeRefreshLayout.setRefreshing(true);
Toast.makeText(getApplicationContext(), "Updating..", Toast.LENGTH_SHORT).show();
retrieveData();
// do nothing
);
progressBar = (ProgressBar) findViewById(R.id.progressbar);
Sprite FoldingCube = new Wave();
progressBar.setIndeterminateDrawable(FoldingCube);
//time and date
final Handler handler = new Handler();
handler.postDelayed(new Runnable()
@Override
public void run()
exit_time();
removeView.requestLayout();
handler.postDelayed(this, 500);
, 500);
//
//
//exit
removeView = findViewById(R.id.exit_entry);
adapter = new MyAdapter(this, employeeArrayList);
removeView.setAdapter(adapter);
//end
removeView.setOnItemClickListener(new AdapterView.OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
ProgressDialog progressDialog = new ProgressDialog(view.getContext());
startActivity(new Intent(getApplicationContext(), Edit_Activity.class)
.putExtra("id", id));
finish();
);
//searchView
search = findViewById(R.id.search);
search.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)
@Override
public void afterTextChanged(Editable s)
filterList.clear();
if (s.toString().isEmpty())
removeView.setAdapter(new MyAdapter(getApplicationContext(), employeeArrayList));
adapter.notifyDataSetChanged();
else
Filter(s.toString());
);
//end
public void retrieveData()
StringRequest request = new StringRequest(Request.Method.POST, Show_url,
new Response.Listener<String>()
@Override
public void onResponse(String response)
employeeArrayList.clear();
try
JSONObject jsonObject = new JSONObject(response);
String sucess = jsonObject.getString("success");
JSONArray jsonArray = jsonObject.getJSONArray("veeta_vehicles");
if (sucess.equals("1"))
for (int i = 0; i < jsonArray.length(); i++)
JSONObject object = jsonArray.getJSONObject(i);
String id = object.getString("id");
String number = object.getString("number");
String name = object.getString("name");
String time = object.getString("surnam");
String date = object.getString("dob");
String time = object.getString("die");
String yes = object.getString("yes");
employee = new Employee(id, number, name, time, date, time, yes);
employeeArrayList.add(employee);
adapter.notifyDataSetChanged();
progressBar.setVisibility(View.GONE);
mSwipeRefreshLayout.setRefreshing(false);
Toast.makeText(getApplicationContext(), "List Updated", Toast.LENGTH_SHORT).show();
catch (JSONException e)
e.printStackTrace();
, new Response.ErrorListener()
@Override
public void onErrorResponse(VolleyError error)
Toast.makeText(exit_Activity.this, error.getMessage(), Toast.LENGTH_LONG).show();
error.printStackTrace();
);
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(request);
private void Filter(String text)
for (Employee post : employeeArrayList)
String filterPattern = text.toLowerCase().trim();
if (post.getnumber().toLowerCase().contains(filterPattern))
filterList.add(post);
removeView.setAdapter(new MyAdapter(getApplicationContext(), filterList));
adapter.notifyDataSetChanged();
MyAdapter.class：
public class MyAdapter extends ArrayAdapter<Employee> implements Filterable
Context context;
List<Employee> arrayListEmployee;
public MyAdapter(@NonNull Context context, List<Employee> arrayListEmployee)
super(context, R.layout.custom_list_item,arrayListEmployee);
this.context = context;
this.arrayListEmployee = arrayListEmployee;
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent)
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.custom_list_item,null,true);
TextView tvID = view.findViewById(R.id.txt_id);
TextView tvName = view.findViewById(R.id.view_vehicle_number);
tvID.setText(arrayListEmployee.get(position).getId());
tvName.setText(arrayListEmployee.get(position).getnumber());
return view;
@Override
public int getCount()
return super.getCount();
请用简单的语言解释并提供我的解决方案。我是安卓工作室的新手。提前谢谢x1000
【问题讨论】：
【参考方案1】：我发现方法有问题（检查 cmets）：
private void Filter(String text)
for (Employee post : employeeArrayList)
String filterPattern = text.toLowerCase().trim();
if (post.getnumber().toLowerCase().contains(filterPattern))
filterList.add(post);
//below every time you create new instance of MyAdapter - try comment this line (below) and test it
removeView.setAdapter(new MyAdapter(getApplicationContext(), filterList));
//this is your first instance but you set new adapter for listView
adapter.notifyDataSetChanged();
并用这个替换你的方法：
private void Filter(String text)
for (Employee post : employeeArrayList)
String filterPattern = text.toLowerCase().trim();
if (post.getnumber().toLowerCase().contains(filterPattern))
filterList.add(post);
adapter.clear()
adapter.addAll(filterList);
所以你不用每次都创建适配器的新实例，只需交换现有适配器的数据
我尚未对其进行测试，但它应该可以与 OnItemClickListener 一起正常工作...
已编辑
同样的问题……
@Override
public void afterTextChanged(Editable s)
filterList.clear();
if (s.toString().isEmpty())
//you set new instance of adapter and notify old, try comment this line (below) and test it
//removeView.setAdapter(new MyAdapter(getApplicationContext(), employeeArrayList));
adapter.notifyDataSetChanged();
else
Filter(s.toString());
改成这个
@Override
public void afterTextChanged(Editable s)
if (!s.toString().isEmpty())
filterList.clear(); //TODO here is problem, move this to your filter method
Filter(s.toString());
else
//Do nothing, if the EditText field is empty the list will remain filled
还有其他方法可以解决和改进，但我不想让你感到困惑，因为 android 对你来说是全新的体验
已编辑
您使用的是 ArrayAdapter，但我认为它是 RecyclerView，忘记 swapData 方法并尝试新的更改...抱歉
adapter.clear()
adapter.addAll(filterList);
【讨论】：
public void swapData(List> newItems) if (newItems != null) this.arrayListEmployee = newItems; notifyDataSetChanged(); >>>>>>>>>>>>>> 这里 public void swapData(List> newItems) 显示错误，将 List 转换为以上是关于Listview自定义过滤器在过滤列表中单击错误的项目的主要内容，如果未能解决你的问题，请参考以下文章
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