是否可以过滤数组列表中的结果，然后将该列表添加到数组适配器？

Posted 2023-04-19

【中文标题】是否可以过滤数组列表中的结果，然后将该列表添加到数组适配器？

【英文标题】：Is it possible to filter the result in array list and then add that list to array adapter?

【发布时间】：2019-03-31 09:58:16

【问题描述】：

// 我正在从 allShops 的数据库中获取数据 jsonArrayRequest jsonArrayRequest; jsonArrayRequest = new JsonArrayRequest(url, new Response.Listener() @覆盖 public void onResponse(JSONArray 响应)

            for (int i = 0; i < response.length(); i++) 
                try 
                    JSONObject jsonObject = response.getJSONObject(i);
                    //allShops is an arraylist
                    allShops.add(jsonObject.getString("name"));
                 catch (JSONException e) 
                    e.printStackTrace();
                
            

            //user enters text in edittext et_search
            et_search.addTextChangedListener(new TextWatcher() 
                @Override
                public void beforeTextChanged(CharSequence s, int start, int count, int after)
                


                

                @Override
                public void onTextChanged(CharSequence cs, int start, int before, int count)
                

                

                @Override
                public void afterTextChanged(Editable s) 
                    //here i am adding arraylist to adapter but want it to happen after filtering the arraylist first based on  users input
                    adapter = new ArrayAdapter<String>(getApplicationContext(),android.R.layout.simple_list_item_1,allShops);
                    (Search.this).adapter.getFilter().filter(s);
                    lv_search.setAdapter(adapter);
                
            );

【问题讨论】：

有可能吗？你试过什么，你在哪里卡住了？请在您的帖子中添加更多详细信息。 .

使用 java 流过滤它。这些mkyong.com/java8/java-8-streams-filter-examples 示例将对您有所帮助

谢谢@Lucefer

【参考方案1】：

我更新了代码的闲置部分：

@Override
                public void onTextChanged(CharSequence cs, int start, int before, int count)
                
                    if (cs.length()== 0)
                    
                        adapter = new ArrayAdapter<String>(getApplicationContext(),android.R.layout.simple_list_item_1,new ArrayList<String>());
                        //(Search.this).adapter.getFilter().filter(cs);
                        lv_search.setAdapter(adapter);
                    
                    else
                    
                        List<String> filtered = new ArrayList<String>();
                        for(String x:allShops)
                        
                            if (x.toLowerCase().contains(cs.toString().toLowerCase()))
                            
                                filtered.add(x);
                            
                        
                        adapter = new ArrayAdapter<String>(getApplicationContext(),android.R.layout.simple_list_item_1,filtered);
                        lv_search.setAdapter(adapter);