从服务器检索的 JSON 对象上的 SearchView

Question

我已经处理了很长一段时间的应用程序，并且即将完成，但我需要最后一件事的帮助。

在这个应用程序中，用户可以输入name of client、mobile number of client 和email id of client，所有这些信息都会存储到在线数据库中。我有一个生成 JSON 文件的 PHP 文件，我的应用程序获取此 JSON 文件并将其内容设置为 listview。

这是我的 ListActivity，它有一个负责获取 JSON 文件的子类

public class ListActivity extends AppCompatActivity implements MaterialSearchView.OnQueryTextListener {

    String json_string;
    ListDataAdapter listDataAdapter;
    MaterialSearchView materialSearchView;
    DataProvider dataProvider;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list);

        Toolbar searching = (Toolbar)findViewById(R.id.searchBar);
        setSupportActionBar(searching);
        getSupportActionBar().setTitle("Search");
        searching.setTitleTextColor(Color.parseColor("#ffffff"));

        materialSearchView = (MaterialSearchView)findViewById(R.id.search_view);

        final ListView listView = (ListView)  findViewById(R.id.list_view);
        listDataAdapter = new ListDataAdapter(getApplicationContext(),R.layout.row_layout);
        listView.setAdapter(listDataAdapter);
        Log.e("data=======", String.valueOf(listDataAdapter));

        new GetJSONfile().execute();

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                DataProvider dataProvider = (DataProvider) listDataAdapter.getItem(i);

                int idofclient = dataProvider.getId();
                String nameOfClient = dataProvider.getName();
                String mobileOfClient = dataProvider.getMob();
                String emailOfClient = dataProvider.getEmail();

                Intent calAct = new Intent(ListActivity.this, UserProfile.class);

                Bundle bundle = new Bundle();
                bundle.putInt("idofCC", (idofclient));
                bundle.putString("name", nameOfClient);
                bundle.putString("mobile", mobileOfClient);
                bundle.putString("email", emailOfClient);

                calAct.putExtras(bundle);
                startActivity(calAct);
            }
        });
    }

    @Override
    public boolean onQueryTextSubmit(String s) {
        return false;
    }

    @Override
    public boolean onQueryTextChange(String newText) {
        newText = newText.toLowerCase();
        ArrayList<DataProvider> dataProvider2 = new ArrayList<>();
        //dataProvider is your data which is provide to adapter in onPostExecute
        // so make it as global variable so you can access it
        for (DataProvider dp : listDataAdapter) {
            String name = dp.getName().toLowerCase();
            if (name.contains(newText)) {
                dataProvider2.add(dp);
            }
        }
        listDataAdapter.setFilter(dataProvider2);
        return true;
    }


    public class GetJSONfile extends AsyncTask<Void, Void, String> {
        String url_get;
        String jsondata;

        @Override
        protected void onPreExecute() {
            url_get = "http://10.0.2.2/webapp/jasonclient.php";
        }

        @Override
        protected String doInBackground(Void... voids) {
            try {
                URL url = new URL(url_get);
                HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
                InputStream inputStream = httpURLConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                StringBuilder stringBuilder = new StringBuilder();
                while((jsondata = bufferedReader.readLine())!=null){
                    stringBuilder.append(jsondata+"\n");
                }

                bufferedReader.close();
                inputStream.close();
                httpURLConnection.disconnect();
                Log.e("Tag =============", String.valueOf(stringBuilder));

                return stringBuilder.toString();

            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

            return null;
        }

        @Override
        protected void onProgressUpdate(Void... values) {
            super.onProgressUpdate(values);
        }

        @Override
        protected void onPostExecute(String jsonResult) {
            json_string = jsonResult;
            try{
                JSONObject jsonn = new JSONObject(json_string);
                JSONArray jsonArray = jsonn.getJSONArray("clientinfo");

                int count = 0;
                while(count<jsonArray.length()){
                    JSONObject JO = jsonArray.getJSONObject(count);
                    int id = JO.getInt("client_id");
                    String name = JO.getString("client_name");
                    String mobile = JO.getString("client_mobile");
                    String email = JO.getString("client_email");

                    Log.e("nameeeeeeeee==========",name);
                    Log.e("mobileeeeeee==========",mobile);
                    Log.e("emaillllllll==========",email);

                    dataProvider = new DataProvider(id,name,mobile,email);
                    Log.e("tag==================", String.valueOf(dataProvider));
                    listDataAdapter.add(dataProvider);
                    count++;
                }
            } catch (JSONException e) {

            }

        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu,menu);
        MenuItem menuItem = menu.findItem(R.id.ActionSearchView);
        materialSearchView.setMenuItem(menuItem);
        materialSearchView.setOnQueryTextListener(this);
        return true;
    }
}

以下是我的 ListDataAdapter 类

public class ListDataAdapter extends ArrayAdapter {

    List list = new ArrayList();

    public ListDataAdapter( Context context,  int resource) {
        super(context, resource);
    }

    static  class LayoutHandler {
        TextView ID,NAME,MOB,EMAIL;
    }

    @Override
    public void add(Object object) {
        super.add(object);
        list.add(object);
    }

    @Override
    public int getCount() {
        return list.size();
    }


    @Override
    public Object getItem(int position) {
        return list.get(position);
    }


    @Override
    public View getView(int position,  View convertView,  ViewGroup parent) {
        View row = convertView;
        LayoutHandler layoutHandler;

        if(row == null){
            LayoutInflater layoutInflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            row = layoutInflater.inflate(R.layout.row_layout,parent,false);

            layoutHandler = new LayoutHandler();
            layoutHandler.NAME = (TextView) row.findViewById(R.id.text_user_name);

            row.setTag(layoutHandler);
        }else{
            layoutHandler = (LayoutHandler) row.getTag();
        }
        DataProvider dataProvider = (DataProvider) this.getItem(position);
        layoutHandler.NAME.setText(dataProvider.getName());

        return row;
    }

    public void setFilter(ArrayList<DataProvider> dataProvider2)
    {
        //dataProvider is your List which is used in constructor of adapter
        //class
        ArrayList<Object> dataProvider = new ArrayList<>();
        dataProvider.addAll(dataProvider2);
        notifyDataSetChanged();
    }
}

这是一个示例，说明当我开始在搜索栏中输入一些字符时，我希望应用执行什么操作。

这是一个漫长的项目，所以我没有包含我所有的源代码，但是如果你需要什么，请评论，我会添加它。

Answer 1

你需要先设置list.setadapter(null), 然后您可以在适配器或适配器数据集中填充值，最后调用 list.setadapter(adap)，然后调用 adap.setNotifyDataChanged() 除了 "" 之外的每个字符更改都应该这样做，你应该很好

Answer 2

您可以尝试以这种方式实现搜索。我没有测试它，我希望它会工作。在适配器类中创建一个方法：

 public void setFilter(ArrayList<Object> dataProvider2)
{
    //list is your List which is used in constructor of adapter
    //class
    list = new ArrayList<>();
    list.addAll(dataProvider2);
    notifyDataSetChanged();
}

然后在Activity 内部，我会假设你implements SearchView.OnQueryTextListener 和你override onQueryTextSubmit 和onQueryTextChange 内部onCreateOptionsMenu 你做了这样的事情：

 @Override
public boolean onCreateOptionsMenu(Menu menu) {

    getMenuInflater().inflate(R.menu.action_search, menu);

    final MenuItem myActionMenuItem = menu.findItem(R.id.action_search);
    searchView = (SearchView) myActionMenuItem.getActionView();
    searchView.setOnQueryTextListener(this);
    return true;
}

然后在onQueryTextChange里面使用下一个代码：

@Override
public boolean onQueryTextChange(String newText) {

    newText = newText.toLowerCase();
    ArrayList<DataProvider> dataProvider2 = new ArrayList<>();
   //listDataAdapter is your data which is provide to adapter in onPostExecute
   // so make it as global variable so you can access it
    for (int i = 0; i < listDataAdapter.getCount(); i++) {
         DataProvider dp = listDataAdapter.getItem(i);
        String name = dp.getName().toLowerCase(); 
        if (name.contains(newText)) {
            dataProvider2.add(dp);
        }
    }
    listAdapter.setFilter(dataProvider2);
    return true;
}

确保您遵循传递正确的数据，因为如果您在不应该为空的地方提供空的List，它将不起作用，并且不会过滤数据。

Answer 3

您可以通过两种方式实现：

1. 在每个键入的字符处调用 API。
2. 将所有列表数据存储在 Sqlite 中，搜索时列表将来自本地数据库。

使用 RecyclerView 来实现：

参考：https://www.learn2crack.com/2017/03/searchview-with-recyclerview.html

在您的 Activity 类上执行以下代码：

  EditText editTextSearch;


 editTextSearch = (EditText) findViewById(R.id.searcheditTxtTI); 

 editTextSearch.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void afterTextChanged(Editable editable) {
                if(editTextSearch.getText().length()>=1){
                    adapter.getFilter().filter(editTextSearch.getText().toString());
                    recyclerView.setVisibility(View.VISIBLE);
                }else{
                    recyclerView.setVisibility(View.GONE);
                }




            }
        });

在你的适配器上做这样的代码：

 @Override
public Filter getFilter() {

    return new Filter() {
        @Override
        protected FilterResults performFiltering(CharSequence charSequence) {

            String charString = charSequence.toString();

            if (charString.isEmpty()) {

                mFilteredList = list;
            } else {

                ArrayList<LoadDataResult> filteredList = new ArrayList<>();

                for (LoadDataResult txt : list) {

                    if (txt.getName().toString().toLowerCase().contains(charString)|| txt.getUpc().toString().toLowerCase().contains(charString)) {

                        filteredList.add(txt);
                    }
                }

                mFilteredList = filteredList;
            }

            FilterResults filterResults = new FilterResults();
            filterResults.values = mFilteredList;
            return filterResults;
        }

        @Override
        protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
            mFilteredList = (ArrayList<LoadDataResult>) filterResults.values;
            notifyDataSetChanged();
        }
    };
}