0
我在Active.com上使用他们的API进行搜索，目前我的搜索停滞在这个错误：org.json.JSONException：在字符0输入结束。我是新手，任何帮助表示赞赏。疑难解答JSONException：在字符0输入结束
MainActivity
private class SearchTask extends AsyncTask<String, Integer, String>
{
ProgressDialog dialog;
@Override
protected void onPreExecute() {
dialog = ProgressDialog.show(StayActiveActivity.this,"","Please Wait...");
super.onPreExecute();
}
@Override
protected String doInBackground(String... params) {
try {
String result = ActiveHelper.download(params [0]);
return result;
} catch (ApiException e) {
e.printStackTrace();
Log.e("alatta", "Problem making search request");
}
return "";
}
@Override
protected void onPostExecute(String result) {
try {
JSONObject obj = new JSONObject(result);
m_results = obj.getJSONArray("results");
if (m_results == null || m_results.length() == 0)
{
Toast.makeText(getApplicationContext(),
"No Results found for " + m_search_text.getText(),
Toast.LENGTH_LONG).show();
}
else
m_search_results.setAdapter(new JSONAdapter(getApplicationContext()));
} catch (JSONException e) {
e.printStackTrace();
}
}
}
private class JSONAdapter extends BaseAdapter
{
public JSONAdapter(Context c){
}
public int getCount()
{
return m_results.length();
}
public Object getItem(int arg0){
return null;
}
public long getItemId(int pos){
return pos;
}
public View getView(int pos, View convertView, ViewGroup parent) {
View tv;
TextView t;
if (convertView == null)
tv = m_inflater.inflate (R.layout.item, parent, false);
else
tv = convertView;
try {
/* For each entry in the ListView, we need to populate
* its text and timestamp */
t = (TextView) tv.findViewById(R.id.text);
JSONObject obj = m_results.getJSONObject(pos);
t.setText (obj.getString("event") + ": " +
obj.getString("text"));
t = (TextView) tv.findViewById(R.id.created_at);
t.setText (obj.getString("created_at"));
} catch (JSONException e) {
Log.e("alatta", e.getMessage());
}
return tv;
}
}
ActiveHelper
public class ActiveHelper {
private static final String ACTIVE_SEARCH = "http://api.amp.active.com/search?&v=json&api_key=rm4agnjv6k4m4tvpft95xvbn";
private static final int HTTP_STATUS_OK = 200;
private static byte[] buff = new byte[1024];
public static class SearchException extends Exception {
public SearchException (String msg)
{
super (msg);
}
public SearchException (String msg, Throwable thr)
{
super (msg, thr);
}
}
protected static synchronized String download (String parm)
throws SearchException
{
String url = ACTIVE_SEARCH+ parm;
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(url);
try {
HttpResponse response = client.execute(request);
StatusLine status = response.getStatusLine();
if (status.getStatusCode() != HTTP_STATUS_OK)
throw new SearchException("Invalid response from search.active.com" +
status.toString());
HttpEntity entity = response.getEntity();
InputStream ist = entity.getContent();
ByteArrayOutputStream content = new ByteArrayOutputStream();
int readCount = 0;
while ((readCount = ist.read(buff)) != -1)
content.write(buff, 0, readCount);
return new String (content.toByteArray());
} catch (Exception e) {
e.printStackTrace();
throw new SearchException("Problem using the API", e);
}
}
}
堆栈跟踪
06-11 15:01:27.569: E/alatta(7698): Problem making search request
06-11 15:01:27.569: W/System.err(7698): org.json.JSONException: End of input at character 0 of
06-11 15:01:27.569: W/System.err(7698): at org.json.JSONTokener.syntaxError(JSONTokener.java:446)
06-11 15:01:27.569: W/System.err(7698): at org.json.JSONTokener.nextValue(JSONTokener.java:93)
06-11 15:01:27.569: W/System.err(7698): at org.json.JSONObject.<init>(JSONObject.java:154)
06-11 15:01:27.569: W/System.err(7698): at org.json.JSONObject.<init>(JSONObject.java:171)
06-11 15:01:27.569: W/System.err(7698): at my.stayactive.plan.StayActiveActivity$SearchTask.onPostExecute(StayActiveActivity.java:120)
06-11 15:01:27.569: W/System.err(7698): at my.stayactive.plan.StayActiveActivity$SearchTask.onPostExecute(StayActiveActivity.java:1)
06-11 15:01:27.569: W/System.err(7698): at android.os.AsyncTask.finish(AsyncTask.java:417)
06-11 15:01:27.569: W/System.err(7698): at android.os.AsyncTask.access$300(AsyncTask.java:127)
06-11 15:01:27.579: W/System.err(7698): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
06-11 15:01:27.579: W/System.err(7698): at android.os.Handler.dispatchMessage(Handler.java:99)
06-11 15:01:27.579: W/System.err(7698): at android.os.Looper.loop(Looper.java:150)
06-11 15:01:27.579: W/System.err(7698): at android.app.ActivityThread.main(ActivityThread.java:4293)
06-11 15:01:27.579: W/System.err(7698): at java.lang.reflect.Method.invokeNative(Native Method)
06-11 15:01:27.579: W/System.err(7698): at java.lang.reflect.Method.invoke(Method.java:507)
06-11 15:01:27.579: W/System.err(7698): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)
06-11 15:01:27.579: W/System.err(7698): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607)
06-11 15:01:27.579: W/System.err(7698): at dalvik.system.NativeStart.main(Native Method)
你的问题提到了一个'JSONException'，但你所发布的代码都没有实际执行任何JSON处理。 – Squonk
对不起，更新。 –
如果您从异常中发布实际堆栈跟踪将会很有帮助。从你的描述中，听起来你的HTTP请求的结果是返回一个空字符串。您也可以考虑使用EntityUtils.toString方法，而不是自己进行字符串转换：http://developer.android.com/reference/org/apache/http/util/EntityUtils.html#toString%28org.apache.http。 HttpEntity％29 – twaddington