我需要更改json解析器使用jackson， 因为这个应用解析器数据比原计划更多，
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我解析如下： 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;
}
}
因为此应用需要最佳性能。非常感谢。
答案 0 :(得分：0)
我建议你将Jackson与Retrofit结合使用，后者是基于RxJava构建的。所以你不必关心异步任务。图书馆将为您做一切。