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我正在使用具有销售和采购管理的项目的详细方法开发一个 android 应用程序。

为此,我正在使用登录和其他屏幕应用程序..

我的项目已在SQLite数据库中正确运行,我怎样才能使其成为集中使用JSON

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2 回答 2

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http://www.androidhive.info/2012/01/android-json-parsing-tutorial/

有关 Jsonparsing 教程,请参阅上面的链接。基本上,您将需要从 url 返回 json 对象的示例中的 JSONParser.java。

链接还包括可下载的代码。但请确保您使用 AsyncTask 来执行所有基于网络的任务。

于 2012-12-06T07:05:44.627 回答
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您可以将 Json 与 PHP 和 MYSQL 一起用于集中式应用程序。

有关登录活动,请参阅以下教程,..

登录

以及其他数据库活动,如创建、插入、获取、更新和删除服务器端数据库上的数据,请遵循本教程,..

PHP 和 MYSQL

这里重要的是,您需要为您的应用程序创建一个服务器端数据库。

而下面的 java 文件对于 JSON 活动更重要,..

JSONParser.java
 package com.example.androidhive;

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.UnsupportedEncodingException;
 import java.util.List;
 import org.apache.http.HttpEntity;
 import org.apache.http.HttpResponse;
 import org.apache.http.NameValuePair;
 import org.apache.http.client.ClientProtocolException;
 import org.apache.http.client.entity.UrlEncodedFormEntity;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.client.utils.URLEncodedUtils;
 import org.apache.http.impl.client.DefaultHttpClient;
 import org.json.JSONException;
 import org.json.JSONObject;
 import android.util.Log;
 public class JSONParser {
 static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
 // constructor
public JSONParser() {
 }
 // function get json from url
// by making HTTP POST or GET method
public JSONObject makeHttpRequest(String url, String method,
        List<NameValuePair> params) {
     // Making HTTP request
    try {
         // check for request method
        if(method == "POST"){
            // request method is POST
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setEntity(new UrlEncodedFormEntity(params));
             HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();
         }else if(method == "GET"){
            // request method is GET
            DefaultHttpClient httpClient = new DefaultHttpClient();
            String paramString = URLEncodedUtils.format(params, "utf-8");
            url += "?" + paramString;
            HttpGet httpGet = new HttpGet(url);
             HttpResponse httpResponse = httpClient.execute(httpGet);
            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;
 }
}
于 2012-12-06T07:07:19.880 回答