JSON解析的Android [英] JSON parsing android
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;
因为你在运行时，您PROGRAMM崩溃
JSON = Parser.getJSONFromUrl（URL）;
在UI线程上下文。你必须使用一个的AsyncTask
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();
?>
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);
}
这篇关于JSON解析的Android的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
