来自jsonparser的android正在改变jackson

Question

我需要更改json解析器使用jackson，因为这个应用程序解析器的数据比最初计划的要多，

tempActivity.java

package com.xxx.xxx;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.xxx.xxx.libs.JSONParser;
public class tempActivity extends MainActivity {
    ListView list;
    TextView name;
    TextView intro;
    TextView info;
    tempLazyAdapter adapter;
    String searchStr;
    //Button Btngetdata;
    ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
    //URL to get JSON Array
    private static String url = "http:/xxx/json.php?keyword=";
    private static String pageurl = "&page=";
    //private static String encodedurl = "http://www.ebuddha.org/temp_json.php";
    //String url= getResources().getString(R.string.temp_url);
    //JSON Node Names
    String encodedurl = url;
    private static final String TAG_OS = "temp";
    private static Context mContext; 
    JSONArray temp = null;
    JSONArray tmp_temp = null;
    JSONArray newtemp = null;
    private int preLast;
    // Flag for current page
    int current_page = 1;   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Intent intent = this.getIntent();
        Bundle bundle = intent.getExtras();
        mContext = getApplicationContext(); 
        if(bundle.getString("keyword") != null){
            // Getting JSON from URL
            try {
                searchStr = URLEncoder.encode(bundle.getString("keyword"),"UTF-8");
                encodedurl = url + searchStr + pageurl + current_page ;
            } 
            catch (Exception e) {
                e.printStackTrace();
            }
        }
        acttemp = true;
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_temp);
        final ConnectivityManager conMgr =  (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        final NetworkInfo activeNetwork = conMgr.getActiveNetworkInfo();
        if (activeNetwork != null && activeNetwork.isConnected()) {
            //notify user you are online
            oslist = new ArrayList<HashMap<String, String>>();
            new JSONParse().execute();
        } else {
            //notify user you are not online
            Toast.makeText(tempActivity.this, R.string.disconnect, Toast.LENGTH_SHORT).show();
        } 
        final EditText edittext = (EditText) findViewById(R.id.eText_search);
        edittext.addTextChangedListener(new TextWatcher() {
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) { }
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) { }
            @Override
            public void afterTextChanged(Editable s) {
                if (s.length() > 0) {
                    // TODO Auto-generated method stub 
                    char lastCharacter = s.charAt(s.length() - 1); 
                    if (lastCharacter == 'n') { 
                        String instr = s.subSequence(0, s.length() - 1).toString();
                        try {
                            current_page = 1; 
                            searchStr = URLEncoder.encode(instr,"UTF-8");
                            encodedurl = url + searchStr + pageurl + current_page;
                        } catch (UnsupportedEncodingException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                        if (activeNetwork != null && activeNetwork.isConnected()) {
                            //notify user you are online
                            oslist = new ArrayList<HashMap<String, String>>();
                            new JSONParse().execute();
                        } else {
                            //notify user you are not online
                            Toast.makeText(tempActivity.this, R.string.disconnect, Toast.LENGTH_SHORT).show();
                        } 
                        edittext.setText("");
                        InputMethodManager imm = (InputMethodManager)getSystemService(
                              Context.INPUT_METHOD_SERVICE);
                        imm.hideSoftInputFromWindow(edittext.getWindowToken(), 0);
                    }
                } 
            }
        });
        // Implementing scroll refresh
        list.setOnScrollListener(new AbsListView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(AbsListView absListView, int i) {
            }
            @Override
            public void onScroll(AbsListView absListView, int firstItem, int visibleItemCount, final int totalItems) {
               // Log.e("Get position", "--firstItem:" + firstItem + "  visibleItemCount:" + visibleItemCount + "  totalItems:" + totalItems + "  pageCount:" + pageCount);
                int total = firstItem + visibleItemCount;
                final int lastItem = firstItem + visibleItemCount;
                // Total array list i have so it
                //if (pageCount < 2) {
                    if (total == totalItems) {
                        if(preLast!=lastItem){
                            preLast = lastItem;
                        current_page++;
                        encodedurl = url + searchStr + pageurl + current_page;
                        new JSONParse().execute();
                        }
                    }
                //} else {
                //    Log.e("hide footer", "footer hide");
                //    listView.removeFooterView(footer);
                //}
            }
        });        
    }
    @Override
    public void onDestroy()
    {
        if(list != null){
            list.setAdapter(null);
        }
        super.onDestroy();
    }
    @Override
    protected void onResume() {
        super.onResume();
        System.gc(); 
    }
    private class JSONParse extends AsyncTask<String, String, JSONObject> {
         private ProgressDialog pDialog;
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            list=(ListView)findViewById(R.id.list);

            name = (TextView)findViewById(R.id.name);
            intro = (TextView)findViewById(R.id.intro);
            info = (TextView)findViewById(R.id.info);
            pDialog = new ProgressDialog(tempActivity.this);
            pDialog.setMessage(getString(R.string.load_temp_data));
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);  
            pDialog.setCanceledOnTouchOutside(false);
            pDialog.show();

        }
        @Override
        protected JSONObject doInBackground(String... args) {
            JSONParser jParser = new JSONParser();
            JSONObject json = jParser.getJSONFromUrl(encodedurl);
            return json;
        }

         @Override
         protected void onPostExecute(JSONObject json) {
             pDialog.dismiss();
             try {
                // Getting JSON Array from URL
                if(current_page <= 1){
                    temp = json.getJSONArray(TAG_OS);
                    adapter=new tempLazyAdapter(mContext, tempActivity.this, temp);
                    list.setAdapter(adapter);
                    list.setOnItemClickListener(new DrawerItemClickListener());
                }else{
                    newtemp = json.getJSONArray(TAG_OS);
                     for (int i = 0; i < newtemp.length(); i++) {
                         temp.put(newtemp.get(i));
                        }
                    adapter.notifyDataSetChanged();
                    //list.setAdapter(adapter);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
         }
        private class DrawerItemClickListener implements ListView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView parent, View view, int position, long id) {
            //selectItem(position);
            TextView tid = (TextView) view.findViewById(R.id.tid);
            String selectTid = tid.getText().toString();
            //Toast.makeText(tempActivity.this, "click:" + selectTid, Toast.LENGTH_SHORT).show();
            Intent tempInfoIntent = new Intent(tempActivity.this,
                    tempInfoActivity.class);
            Bundle bundle = new Bundle();
            bundle.putString("tid", selectTid);
            tempInfoIntent.putExtras(bundle); 
            startActivity(tempInfoIntent);     
        }
    }
    }
}

使用json，我将对此进行如下解析：JSONParser.java

package com.xxx.xxx.libs;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
//import com.xxx.xxx.ImageLoader;
public class JSONParser {
    static InputStream is = null;
    static JSONObject jObj = null;
    static String json = "";
    // constructor
    public JSONParser() {
        //imageLoader = new ImageLoader(activity.getApplicationContext());
    }
    public JSONObject getJSONFromUrl(String url) {
        // Making HTTP request
        try {
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            /*
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "n");
            }
            is.close();
            json = sb.toString();
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }
        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }
        // return JSON String
        return jObj;
    }
}

因为这个应用程序需要最好的性能。非常感谢。

Answer 1

我建议您将Jackson与基于RxJava的Improve结合使用。因此，您不必关心异步任务。图书馆会为你做一切。