php - 从服务器检索的JSON对象上的SearchView

Question

我已经在应用程序上工作了一段时间，并且即将完成，但是我需要最后一件事的帮助。

在此应用程序中，用户可以输入name of client，mobile number of client和email id of client，所有这些信息都存储在在线数据库中。我有一个PHP文件，该文件生成一个JSON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，它具有负责获取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();
    }
}

这是当我开始在搜索栏中键入一些字符时希望应用程序执行的示例。



这是一个漫长的项目，这就是为什么我没有包含所有源代码的原因，但是如果您需要任何内容​​，请发表评论，我会添加它。

Answer 1

您需要先设置list.setadapter（null），
那么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（）
对于除“”之外的每个字符更改，都应执行此操作，并且您应该很好