JSON解析的Android

本文介绍了JSON解析的Android的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我需要咨询关于我的code。

我试图解析由PHP函数生成的JSON数组 json_en code（）。

我的JSON：

{数据： [{\"streamer\":\"froggen\",\"yt_length\":\"25078\"},{\"streamer\":\"wingsofdeath\",\"yt_length\":\"8979\"},{\"streamer\":\"guardsmanbob\",\"yt_length\":\"4790\"},{\"streamer\":\"kaostv\",\"yt_length\":\"4626\"},{\"streamer\":\"kungentv\",\"yt_length\":\"3883\"},{\"streamer\":\"destiny\",\"yt_length\":\"3715\"},{\"streamer\":\"zekent\",\"yt_length\":\"3428\"},{\"streamer\":\"athenelive\",\"yt_length\":\"1673\"},{\"streamer\":\"frommaplestreet\",\"yt_length\":\"1614\"},{\"streamer\":\"keyorikeys\",\"yt_length\":\"1410\"},{\"streamer\":\"riotgamesturkish\",\"yt_length\":\"1397\"},{\"streamer\":\"vman7\",\"yt_length\":\"1022\"},{\"streamer\":\"tiensinoakuma\",\"yt_length\":\"967\"},{\"streamer\":\"affenklappe\",\"yt_length\":\"748\"},{\"streamer\":\"teamkeyd\",\"yt_length\":\"747\"},{\"streamer\":\"lagtvmaximusblack\",\"yt_length\":\"683\"},{\"streamer\":\"lolgameru\",\"yt_length\":\"665\"},{\"streamer\":\"gruntartv\",\"yt_length\":\"585\"},{\"streamer\":\"entenzwerg\",\"yt_length\":\"579\"},{\"streamer\":\"lolgameru_cauthonpro\",\"yt_length\":\"506\"},{\"streamer\":\"basickz\",\"yt_length\":\"488\"},{\"streamer\":\"ilysuiteheart\",\"yt_length\":\"491\"},{\"streamer\":\"kireiautumn\",\"yt_length\":\"485\"},{\"streamer\":\"ultimavv\",\"yt_length\":\"471\"}]}

Java类：

 公共类JSONParser {
静态InputStream为= NULL;
静态的JSONObject jObj = NULL;
静态JSON字符串=;
串响应=;//构造
公共JSONParser（）{
}公众的JSONObject getJSONFromUrl（字符串URL）{
    //使HTTP请求
    尝试{
        // defaultHttpClient
        DefaultHttpClient的HttpClient =新DefaultHttpClient（）;
        HTTPGET httpPost =新HTTPGET（URL）;        HTT presponse HTT presponse = httpClient.execute（httpPost）;
        HttpEntity httpEntity = HTT presponse.getEntity（）;
        是= httpEntity.getContent（）;
    }赶上（UnsupportedEncodingException五）{
        e.printStackTrace（）;
    }赶上（ClientProtocolException E）{
        e.printStackTrace（）;
    }赶上（IOException异常五）{
        e.printStackTrace（）;
    }    尝试{
        读者的BufferedReader =新的BufferedReader（新的InputStreamReader（
                是），8）;
        StringBuilder的SB =新的StringBuilder（）;
        串线= NULL;
        而（（行= reader.readLine（））！= NULL）{
            sb.append（行+\\ n）;
        }
        is.close（）;
        JSON = sb.toString（）;
    }赶上（例外五）{
        Log.e（缓冲区错误，错误转换结果+ e.toString（））;
    }    //尝试分析字符串到一个JSON对象
    尝试{
        jObj =新的JSONObject（JSON）;
    }赶上（JSONException E）{
        Log.e（JSON解析器，错误分析数据+ e.toString（））;
    }    //返回JSON字符串
    返回jObj;
}
}

我的活动：

 公共类AndroidJSONParsingActivity扩展ListActivity {
// URL使请求
私有静态字符串URL =http://ololo.tv/vasa;// JSON节点名称
私有静态最后弦乐TAG_DATA =数据;
私有静态最后弦乐TAG_STREAMER =流光
私有静态最后弦乐TAG_VIEWERS =yt_length;//接触JSONArray
JSONArray数据= NULL;@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.main）;    //为哈希映射的ListView
    ArrayList的＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT; DataList控件=新的ArrayList＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT;（）;    //创建JSON解析器实例
    JSONParser分析器=新JSONParser（）;    // URL从获取JSON字符串
    JSONObject的JSON = NULL;        JSON = Parser.getJSONFromUrl（URL）;
    尝试{
        //获取联系人的数组
        数据= json.getJSONArray（TAG_DATA）;        //通过所有联系人循环
        的for（int i = 0; I＆LT; data.length（）;我++）{
            JSONObject的C = data.getJSONObject（I）            //存储在变量中的每个JSON项目
            字符串流光= c.getString（TAG_STREAMER）;
            字符串观众= c.getString（TAG_VIEWERS）;
            //字符串link = c.getString（）;            //创建新的HashMap
            HashMap的＆LT;字符串，字符串＆GT;地图=新的HashMap＆LT;字符串，字符串＆GT;（）;            //将每个子节点的HashMap键=＆GT;值
            map.put（TAG_STREAMER，流光）;
            map.put（TAG_VIEWERS，观众）;
            //map.put(TAG_URL，链接）;            //添加HashList到ArrayList的
            dataList.add（地图）;
        }
    }赶上（JSONException E）{
        e.printStackTrace（）;
    }
    / **
     *更新解析JSON数据到ListView控件
     * * /
    ListAdapter适配器=新SimpleAdapter（这一点，DataList控件，
            R.layout.list_item，
            新的String [] {TAG_STREAMER，TAG_VIEWERS / * TAG_URL * /}，新的INT [] {
                    R.id.streamer，R.id.viewers /*R.id.url*/}）;    setListAdapter（适配器）;    //选择单个ListView项
    ListView控件LV = getListView（）;    //在选择单列表项启动新画面
    lv.setOnItemClickListener（新OnItemClickListener（）{        @覆盖
        公共无效onItemClick（适配器视图＆LT;＆GT;母公司，观景，
                INT位置，长的id）{
            //从选定的ListItem得到的值
            字符串名称=（（的TextView）view.findViewById（R.id.streamer））的getText（）的toString（）。
            字符串viewers_count =（（的TextView）view.findViewById（R.id.viewers））的getText（）的toString（）。
            //字符串URL =（（的TextView）view.findViewById（R.id.url））的getText（）的toString（）。            //开始新意图
            在意向=新意图（getApplicationContext（），SingleMenuItemActivity.class）;
            in.putExtra（TAG_STREAMER，名）;
            in.putExtra（TAG_VIEWERS，viewers_count）;
            //in.putExtra(TAG_PHONE_MOBILE，URL）;
            startActivity（在）;
        }
    }）;
}
}

我尝试使用断点，并且看到，当我把一个断点后 GetEntity ，该计划没有得到那里，因为它早崩溃，或者什么的。

这是我的任务异步

 公共类ParsingTask扩展的AsyncTask＆LT;弦乐，太虚，太虚＆GT; {
JSONParser分析器=新JSONParser（）;保护无效doInBackground（字符串的URL ...）{    ArrayList的＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT; DataList控件=新的ArrayList＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT;（）;
    JSONObject的JSON = Parser.getJSONFromUrl（URL）;    尝试{
        //获取联系人的数组
        数据= json.getJSONArray（TAG_DATA）;        //通过所有联系人循环
        的for（int i = 0; I＆LT; data.length（）;我++）{
            JSONObject的C = data.getJSONObject（I）            //存储在变量中的每个JSON项目
            字符串流光= c.getString（TAG_STREAMER）;
            字符串观众= c.getString（TAG_VIEWERS）;
            //字符串link = c.getString（）;            //创建新的HashMap
            HashMap的＆LT;字符串，字符串＆GT;地图=新的HashMap＆LT;字符串，字符串＆GT;（）;            //将每个子节点的HashMap键=＆GT;值
            map.put（TAG_STREAMER，流光）;
            map.put（TAG_VIEWERS，观众）;
            //map.put(TAG_URL，链接）;            //添加HashList到ArrayList的
            dataList.add（地图）;
        }
    }赶上（JSONException E）{
        e.printStackTrace（）;
    }    / **
     *更新解析JSON数据到ListView控件
     * * /
    ListAdapter适配器=新SimpleAdapter（这一点，DataList控件，
            R.layout.list_item，
            新的String [] {TAG_STREAMER，TAG_VIEWERS / * TAG_URL * /}，新的INT [] {
            R.id.streamer，R.id.viewers /*R.id.url*/}）;    setListAdapter（适配器）;    返回null;
}
保护无效onProgressUpdate（）{}
保护无效onPostExecute（）{}}

ListAdapter错误，似乎是在本有些不妥。这是我的版本如何切断code，它停止返回变量。对不起，我的英语不好，但我希望你理解我：）

加入我的PHP json的制造者。 MB的问题在那里？！

 ＆LT; PHP
mysql_connect（localhost的根，）;
 如果（！mysql_select_db（ololo））{
    回声无法选择ololo。 mysql_error（）;
    }
$ SQL =的mysql_query（选择流光，从pm_videos那里类='1'yt_length）;
如果（！$ SQL）出口（错误 - .mysql_error（），$ tmp_q）;
而（$行= mysql_fetch_assoc（$ sql中））{
$输出[] = $行;
}
$ JSON = json_en code（$输出）;
标题（内容类型：应用程序/ JSON'）;
打印{\\数据\\：$ {JSON}};
mysql_close（）;
？＆GT;

解决方案

 因为你在运行时，您PROGRAMM崩溃
  JSON = Parser.getJSONFromUrl（URL）;
 
在UI线程上下文。你必须使用一个 
 code看起来不错。唯一的问题是，
 公共类ParsingTask扩展的AsyncTask＆LT;弦乐，无效的ArrayList＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT;＆GT; {
 JSONParser分析器=新JSONParser（）; 保护无效doInBackground（字符串的URL ...）{ArrayList的＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT; DataList控件=新的ArrayList＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT;（）;
JSONObject的JSON = Parser.getJSONFromUrl（URL）;尝试{
    //获取联系人的数组
    数据= json.getJSONArray（TAG_DATA）;    //通过所有联系人循环
    的for（int i = 0; I＆LT; data.length（）;我++）{
        JSONObject的C = data.getJSONObject（I）        //存储在变量中的每个JSON项目
        字符串流光= c.getString（TAG_STREAMER）;
        字符串观众= c.getString（TAG_VIEWERS）;
        //字符串link = c.getString（）;        //创建新的HashMap
        HashMap的＆LT;字符串，字符串＆GT;地图=新的HashMap＆LT;字符串，字符串＆GT;（）;        //将每个子节点的HashMap键=＆GT;值
        map.put（TAG_STREAMER，流光）;
        map.put（TAG_VIEWERS，观众）;
        //map.put(TAG_URL，链接）;        //添加HashList到ArrayList的
        dataList.add（地图）;
    }
}赶上（JSONException E）{
    e.printStackTrace（）;
}/ **
 *更新解析JSON数据到ListView控件
 * * /
返回DataList控件;
  } 保护无效onPostExecute（ArrayList的＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT; DataList控件）{
  ListAdapter适配器=新SimpleAdapter（AndroidJSONParsingActivity.this，DataList控件，
        R.layout.list_item，
        新的String [] {TAG_STREAMER，TAG_VIEWERS / * TAG_URL * /}，新的INT [] {
        R.id.streamer，R.id.viewers /*R.id.url*/}）;setListAdapter（适配器）;
    }
 
I need advice about my code.
I'm trying to parse a JSON array generated by the PHP function json_encode().
My json:
{"data": [{"streamer":"froggen","yt_length":"25078"},{"streamer":"wingsofdeath","yt_length":"8979"},{"streamer":"guardsmanbob","yt_length":"4790"},{"streamer":"kaostv","yt_length":"4626"},{"streamer":"kungentv","yt_length":"3883"},{"streamer":"destiny","yt_length":"3715"},{"streamer":"zekent","yt_length":"3428"},{"streamer":"athenelive","yt_length":"1673"},{"streamer":"frommaplestreet","yt_length":"1614"},{"streamer":"keyorikeys","yt_length":"1410"},{"streamer":"riotgamesturkish","yt_length":"1397"},{"streamer":"vman7","yt_length":"1022"},{"streamer":"tiensinoakuma","yt_length":"967"},{"streamer":"affenklappe","yt_length":"748"},{"streamer":"teamkeyd","yt_length":"747"},{"streamer":"lagtvmaximusblack","yt_length":"683"},{"streamer":"lolgameru","yt_length":"665"},{"streamer":"gruntartv","yt_length":"585"},{"streamer":"entenzwerg","yt_length":"579"},{"streamer":"lolgameru_cauthonpro","yt_length":"506"},{"streamer":"basickz","yt_length":"488"},{"streamer":"ilysuiteheart","yt_length":"491"},{"streamer":"kireiautumn","yt_length":"485"},{"streamer":"ultimavv","yt_length":"471"}]}
Java class:
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
String response = "";

// constructor
public JSONParser() {
}

public JSONObject getJSONFromUrl(String url) {
    // Making HTTP request
    try {
        // defaultHttpClient
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet httpPost = new HttpGet(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), 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;
}
}
And my activity:
public class AndroidJSONParsingActivity extends ListActivity {
// url to make request
private static String url = "http://ololo.tv/vasa";

// JSON Node names
private static final String TAG_DATA = "data";
private static final String TAG_STREAMER = "streamer";
private static final String TAG_VIEWERS = "yt_length";

// contacts JSONArray
JSONArray data = null;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    // Hashmap for ListView
    ArrayList<HashMap<String, String>> dataList = new ArrayList<HashMap<String, String>>();

    // Creating JSON Parser instance
    JSONParser Parser = new JSONParser();

    // getting JSON string from URL
    JSONObject json = null;

        json = Parser.getJSONFromUrl(url);


    try {
        // Getting Array of Contacts
        data = json.getJSONArray(TAG_DATA);

        // looping through All Contacts
        for(int i = 0; i < data.length(); i++){
            JSONObject c = data.getJSONObject(i);

            // Storing each json item in variable
            String streamer = c.getString(TAG_STREAMER);
            String viewers = c.getString(TAG_VIEWERS);
            //String link = c.getString();

            // creating new HashMap
            HashMap<String, String> map = new HashMap<String, String>();

            // adding each child node to HashMap key => value
            map.put(TAG_STREAMER, streamer);
            map.put(TAG_VIEWERS, viewers);
            //map.put(TAG_URL, link);

            // adding HashList to ArrayList
            dataList.add(map);
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }


    /**
     * Updating parsed JSON data into ListView
     * */
    ListAdapter adapter = new SimpleAdapter(this, dataList,
            R.layout.list_item,
            new String[] { TAG_STREAMER, TAG_VIEWERS /*TAG_URL*/ }, new int[] {
                    R.id.streamer, R.id.viewers /*R.id.url*/ });

    setListAdapter(adapter);

    // selecting single ListView item
    ListView lv = getListView();

    // Launching new screen on Selecting Single ListItem
    lv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            // getting values from selected ListItem
            String name = ((TextView) view.findViewById(R.id.streamer)).getText().toString();
            String viewers_count = ((TextView) view.findViewById(R.id.viewers)).getText().toString();
            //String url = ((TextView) view.findViewById(R.id.url)).getText().toString();

            // Starting new intent
            Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
            in.putExtra(TAG_STREAMER, name);
            in.putExtra(TAG_VIEWERS, viewers_count);
            //in.putExtra(TAG_PHONE_MOBILE, url);
            startActivity(in);
        }
    });
}
}
I tried using breakpoints, and see that when I put a breakpoint after GetEntity, the program doesn't get there because it crashed early, or something.
This my async task.
public class  ParsingTask extends AsyncTask<String, Void, Void>{


JSONParser Parser = new JSONParser();

protected Void doInBackground(String... urls) {

    ArrayList<HashMap<String, String>> dataList = new ArrayList<HashMap<String, String>>();
    JSONObject json = Parser.getJSONFromUrl(url);

    try {
        // Getting Array of Contacts
        data = json.getJSONArray(TAG_DATA);

        // looping through All Contacts
        for(int i = 0; i < data.length(); i++){
            JSONObject c = data.getJSONObject(i);

            // Storing each json item in variable
            String streamer = c.getString(TAG_STREAMER);
            String viewers = c.getString(TAG_VIEWERS);
            //String link = c.getString();

            // creating new HashMap
            HashMap<String, String> map = new HashMap<String, String>();

            // adding each child node to HashMap key => value
            map.put(TAG_STREAMER, streamer);
            map.put(TAG_VIEWERS, viewers);
            //map.put(TAG_URL, link);

            // adding HashList to ArrayList
            dataList.add(map);
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }

    /**
     * Updating parsed JSON data into ListView
     * */
    ListAdapter adapter = new SimpleAdapter(this, dataList,
            R.layout.list_item,
            new String[] { TAG_STREAMER, TAG_VIEWERS /*TAG_URL*/ }, new int[] {
            R.id.streamer, R.id.viewers /*R.id.url*/ });

    setListAdapter(adapter);

    return null;
}
protected void onProgressUpdate() {

}
protected void onPostExecute() {

}

}
ListAdapter error, seems like something wrong in "this". This my version how cut off code, where it stop return variables. Sorry for bad english, but i hope you understand me :)
Add my php json maker. Mb problem there?!
<?php
mysql_connect("localhost","root","");
 if (!mysql_select_db("ololo")) {
    echo "Unable to select ololo: " . mysql_error();
    }
$sql=mysql_query("select streamer, yt_length from pm_videos where category='1'");
if(!$sql) exit("Error - ".mysql_error().", ".$tmp_q);
while($row=mysql_fetch_assoc($sql)){
$output[]=$row;
}
$json = json_encode($output);
header('Content-Type: application/json');
print "{\"data\": ${json}}";
mysql_close();
?>
 解决方案 
You programm crashes because you are running
json = Parser.getJSONFromUrl(url);
in the UI Thread context. You have to use an AsyncTask
Code looks good. The only problem is that
 public class  ParsingTask extends AsyncTask<String, Void, ArrayList<HashMap<String, String>>>{


 JSONParser Parser = new JSONParser();

 protected Void doInBackground(String... urls) {

ArrayList<HashMap<String, String>> dataList = new ArrayList<HashMap<String, String>>();
JSONObject json = Parser.getJSONFromUrl(url);

try {
    // Getting Array of Contacts
    data = json.getJSONArray(TAG_DATA);

    // looping through All Contacts
    for(int i = 0; i < data.length(); i++){
        JSONObject c = data.getJSONObject(i);

        // Storing each json item in variable
        String streamer = c.getString(TAG_STREAMER);
        String viewers = c.getString(TAG_VIEWERS);
        //String link = c.getString();

        // creating new HashMap
        HashMap<String, String> map = new HashMap<String, String>();

        // adding each child node to HashMap key => value
        map.put(TAG_STREAMER, streamer);
        map.put(TAG_VIEWERS, viewers);
        //map.put(TAG_URL, link);

        // adding HashList to ArrayList
        dataList.add(map);
    }
} catch (JSONException e) {
    e.printStackTrace();
}

/**
 * Updating parsed JSON data into ListView
 * */


return dataList;
  }

 protected void onPostExecute(ArrayList<HashMap<String, String>> dataList) {
  ListAdapter adapter = new SimpleAdapter(AndroidJSONParsingActivity.this, dataList,
        R.layout.list_item,
        new String[] { TAG_STREAMER, TAG_VIEWERS /*TAG_URL*/ }, new int[] {
        R.id.streamer, R.id.viewers /*R.id.url*/ });

setListAdapter(adapter);
    }
                        
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JSON解析的Android