我有一个工作列表视图，它从我的数据库接收JSON。但是，当我尝试使用此链接时：我得到“解析数据时出错org.json.JSONException：Value
JSON输出很干净，应该可以工作！我的活动
package com.spxc.ssa.streaming;
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.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import com.actionbarsherlock.app.SherlockListActivity;
import com.actionbarsherlock.view.MenuItem;
import com.spxc.ssa.streaming.task.JsonAsync;
import com.spxc.ssa.streaming.task.JsonAsync.JsonListener;
public class ListShowsController extends SherlockListActivity implements
OnClickListener {
private ProgressDialog mDialog;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// getWindow().setFormat(PixelFormat.TRANSLUCENT);
setContentView(R.layout.dblist);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle("Shows");
JsonAsync asyncTask = new JsonAsync();
// Using an anonymous interface to listen for objects when task
// completes.
asyncTask.setJsonListener(new JsonListener() {
@Override
public void onObjectReturn(JSONObject object) {
handleJsonObject(object);
}
});
// Show progress loader while accessing network, and start async task.
mDialog = ProgressDialog.show(this, getSupportActionBar().getTitle(),
getString(R.string.loading), true);
asyncTask.execute("");
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
break;
}
return false;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
private void handleJsonObject(JSONObject object) {
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
try {
JSONArray shows = object.getJSONArray("items");
for (int i = 0; i < shows.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
JSONObject e = shows.getJSONObject(i);
map.put("video_id", String.valueOf(i));
map.put("video_title", "" + e.getString("video_title"));
//map.put("season", "Season: " + e.getString("season"));
map.put("video_location", "" + e.getString("video_location"));
mylist.add(map);
}
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
ListAdapter adapter = new SimpleAdapter(this, mylist, R.layout.dbitems,
new String[] { "video_title", "video_location" }, new int[] { R.id.item_title,
R.id.item_subtitle });
setListAdapter(adapter);
final ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
@SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) lv
.getItemAtPosition(position);
Intent myIntent = new Intent(ListShowsController.this,
ShowsController.class);
myIntent.putExtra("video_title", o.get("video_title"));
//myIntent.putExtra("season", o.get("season"));
myIntent.putExtra("video_location", o.get("video_location"));
startActivity(myIntent);
}
});
if (mDialog != null && mDialog.isShowing()) {
mDialog.dismiss();
}
}
}
的AsyncTask
package com.spxc.ssa.streaming.task;
import org.json.JSONObject;
import android.os.AsyncTask;
import android.util.Log;
public class JsonAsync extends AsyncTask<String, Void, JSONObject> {
public interface JsonListener {
public void onObjectReturn(JSONObject object);
}
public void setJsonListener(JsonListener jsonListener) {
mListener = jsonListener;
}
private JsonListener mListener;
public static final String TAG = JsonAsync.class.getSimpleName();
@Override
protected JSONObject doInBackground(String... params) {
// The argument passed into tasks are arrays. So you can pass 0 or more
// arguments, when calling from activity, it's really up to you. They
// just have to be separated by commas. Like this :
// new JsonAsync.execute("thisUrl", "thatUrl", "anotherUrl");
// Although I am only grabbing the first item in the array, by calling
// params[0] below.
JSONObject object = null;
if (params != null && params.length > 0) {
object = JSONfunctions.getJSONfromURL(params[0]);
} else {
Log.e(TAG, "Task needs an argument to be able to retrieve data.");
}
// I return the item out of this method, because it is happening of the
// UI thread, so it can;t update items on the screen. You can work with
// a database from this method. That is actually recommended.
return object;
}
@Override
protected void onPostExecute(JSONObject result) {
// This method can touch UI components without throwing an error.
if (result != null && mListener != null) {
mListener.onObjectReturn(result);
}
super.onPostExecute(result);
}
}
我以前从未见过这个错误！问题是什么？
非常感谢任何帮助！感谢
编辑： 我的其他活动有效：
package com.spxc.ssa.streaming;
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.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import com.actionbarsherlock.app.SherlockListActivity;
import com.actionbarsherlock.view.MenuItem;
import com.spxc.ssa.streaming.task.JsonAsync;
import com.spxc.ssa.streaming.task.JsonAsync.JsonListener;
public class ListMoviesController extends SherlockListActivity implements
OnClickListener {
private ProgressDialog mDialog;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// getWindow().setFormat(PixelFormat.TRANSLUCENT);
setContentView(R.layout.dblist);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle("Movies");
JsonAsync asyncTask = new JsonAsync();
// Using an anonymous interface to listen for objects when task
// completes.
asyncTask.setJsonListener(new JsonListener() {
@Override
public void onObjectReturn(JSONObject object) {
handleJsonObject(object);
}
});
// Show progress loader while accessing network, and start async task.
mDialog = ProgressDialog.show(this, getSupportActionBar().getTitle(),
getString(R.string.loading), true);
asyncTask.execute("http://strongpixel.com/java/movies.php");
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
break;
}
return false;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
private void handleJsonObject(JSONObject object) {
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
try {
JSONArray shows = object.getJSONArray("items");
for (int i = 0; i < shows.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
JSONObject e = shows.getJSONObject(i);
map.put("id", String.valueOf(i));
map.put("name", "" + e.getString("name"));
//map.put("date", "Released: " + e.getString("date"));
map.put("path", "" + e.getString("path"));
mylist.add(map);
}
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
ListAdapter adapter = new SimpleAdapter(this, mylist, R.layout.dbitems,
new String[] { "name", "path" }, new int[] { R.id.item_title,
R.id.item_subtitle });
setListAdapter(adapter);
final ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
@SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) lv
.getItemAtPosition(position);
Intent myIntent = new Intent(ListMoviesController.this,
MoviesController.class);
myIntent.putExtra("name", o.get("name"));
myIntent.putExtra("season", o.get("season"));
myIntent.putExtra("path", o.get("path"));
startActivity(myIntent);
}
});
if (mDialog != null && mDialog.isShowing()) {
mDialog.dismiss();
}
}
}
logcat的：
03-12 08:35:18.722: E/log_tag(25208): Error parsing data org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject
03-12 09:06:52.877: V/CustomViewAbove(26397): Received ACTION_DOWN
03-12 09:06:52.920: V/CustomViewAbove(26397): onInterceptTouch moved to:(30.26232, 662.0), diff:(29.26232, 1.0), mLastMotionX:1.0
03-12 09:06:52.936: V/CustomViewAbove(26397): onInterceptTouch moved to:(73.95948, 663.08905), diff:(72.95948, 0.08905029), mLastMotionX:1.0
03-12 09:06:52.940: V/CustomViewAbove(26397): this slide allowed true dx: 72.95948
03-12 09:06:52.940: V/CustomViewAbove(26397): Starting drag! from onInterceptTouch
03-12 09:06:52.993: V/SlidingMenu(26397): changing layerType. hardware? true
03-12 09:06:53.229: V/SlidingMenu(26397): changing layerType. hardware? false
03-12 09:06:54.214: V/CustomViewAbove(26397): Received ACTION_DOWN
03-12 09:06:54.450: D/dalvikvm(26397): GC_CONCURRENT freed 73K, 7% free 4495K/4812K, paused 3ms+6ms, total 24ms
03-12 09:06:55.025: E/log_tag(26397): Error parsing data org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject
编辑： 我尝试了相同的JSON，但只是在一个txt文件strongpixel.com/java/JSON.txt中，这没有任何问题，加载需要一些时间，但它可以工作。
答案 0 :(得分：1)
由于您的代码无法加载正确的JSON字符串，因此无法使其正常工作。只有一个地方可以下载：
JSONfunctions.getJSONfromURL(params[0])
您遇到了明显的错误：无法从<!doctype html>之类的字符串创建JSON对象。这意味着您下载的是HTML数据而不是JSON。对于简单测试，您可以尝试下一个代码，您将得到相同的错误：
JSONObject object = new JSONObject("<!DOCTYPE html>");
您可以从多种原因得到错误的响应：如果您未指定User-Agent标头或未执行授权，则错误的请求，防火墙，代理甚至服务器可能会返回错误的结果。我建议使用一些Web调试工具来帮助您处理这种情况并确保您的应用程序接收有效数据。 如果您使用的是Windows，我建议您使用Fiddler，它是免费的。以下是如何为测试设备设置fiddler的示例：http://www.cantoni.org/2011/06/28/debug-http-android-fiddler 无论如何，还有其他操作系统的替代工具。
答案 1 :(得分：0)
我搞定了！这是一个简单而愚蠢的错误。我连接的服务器不允许POST，所以在适配器中我将Httppost更改为Httpget