我正在与Volley和org.json合作，在Twitter中从用户时间线中提取JSON。我收到了＃34;错误请求＆＃34;来自我的onErrorResponse。它似乎不是一个URL问题，因为我在LogCat中看到了所需的JSON。这是错误日志：
11-30 22:54:52.273: W/TweetLoader(18610): Error with request
11-30 22:54:52.273: W/System.err(18610): com.android.volley.ParseError: org.json.JSONException: Value [{"contributors":null,"text":"18-propeller copter might be the future of personal air travel, inventors say.\nhttp:\/\/t.co\/TMUtbF80Kp via @CNNTech","geo":null,"retweeted":false,"in_reply_to_screen_name":null,"possibly_sensitive":false,"truncated":false,"lang":"en","entities":{"urls":[{"display_url":"cnn.it\/1bWid4q","expanded_url":"http:\/\/cnn.it\/1bWid4q","indices":[79,101],"url":"http:\/\/t.co\/TMUtbF80Kp"}],"hashtags":[],"user_mentions":[{"id":42703075,"indices":[106,114],"screen_name":"cnntech","id_str":"42703075","name":"cnntech"}],"symbols":[]},"in_reply_to_status_id_str":null,"id":406951229278146560,"in_reply_to_user_id_str":null,"source":"<a href=\"http:\/\/www.hootsuite.com\" rel=\"nofollow\">HootSuite<\/a>","favorited":false,"in_reply_to_status_id":null,"retweet_count":112,"in_reply_to_user_id":null,"created_at":"Sun Dec 01 01:01:48 +0000 2013","favorite_count":59,"id_str":"406951229278146560","place":null,"user":{"location":"","default_profile":false,"profile_background_tile":false,"statuses_count":36621,"lang":"en","profile_link_color":"004287","profile_banner_url":"https:\/\/pbs.twimg.com\/profile_banners\/759251\/1384971184","id":759251,"following":null,"favourites_count":4,"protected":false,"profile_text_color":"000000","contributors_enabled":false,"verified":true,"description":"Bringing you breaking news and the most talked about stories. Join the conversation and let’s connect!","profile_sidebar_border_color":"000000","name":"CNN","profile_background_color":"323232","created_at":"Fri Feb 09 00:35:02 +0000 2007","default_profile_image":false,"followers_count":11060197,"profile_image_url_https":"https:\/\/pbs.twimg.com\/profile_images\/378800000049679889\/9097753c470683f49aa12a6c15eba5c7_normal.jpeg","geo_enabled":false,"profile_background_image_url":"http:\/\/a0.twimg.com\/profile_background_images\/664730338\/60cc7d1f1b1a22a87ccccef026e15949.gif","profile_background_image_url_https":"https:\/\/si0.twimg.com\/profile_background_images\/664730338\/60cc7d1f1b1a22a87ccccef026e15949.gif","follow_request_sent":null,"entities":{"description":{"urls":[]},"url":{"urls":[{"display_url":"cnn.com","expanded_url":"http:\/\/www.cnn.com","indices":[0,22],"url":"http:\/\/t.co\/Db6JkaxJ9R"}]}},"url":"http:\/\/t.co\/Db6JkaxJ9R","utc_offset":-18000,"time_zone":"Eastern Time (US & Canada)","notifications":null,"profile_use_background_image":true,"friends_count":818,"profile_sidebar_fill_color":"EEEEEE","screen_name":"CNN","id_str":"759251","profile_image_url":"http:\/\/pbs.twimg.com\/profile_images\/378800000049679889\/9097753c470683f49aa12a6c15eba5c7_normal.jpeg","is_translator":false,"listed_count":88693},"coordinates":null},{"contributors":null,"text":"Will online classes make professors extinct? \nhttp:\/\/t.co\/g20MbYagb9 via @CNNOpinion","geo":null,"retweeted":false,"in_reply_to_screen_name":null,"possibly_sensitive":false,"truncated":false,"lang":"en","entities":{"urls":[{"display_url":"cnn.it\/1b4VUbw","expanded_url":"http:\/\/cnn.it\/1b4VUbw","indices":[46,68],"url":"http:\/\/t.co\/g20MbYagb9"}],"hashtags":[],"user_mentions":[{"id":259074538,"indices":[73,84],"screen_name":"CNNOpinion","id_str":"259074538","name":"CNN Opinion"}],"symbols":[]},"in_reply_to_status_id_str":null,"id":406921147427852288,"in_reply_to_user_id_str":null,"source":"<a href=\"http:\/\/www.hootsuite.com\" rel=\"nofollow\">HootSuite<\/a>","favorited":false,"in_reply_to_status_id":null,"retweet_count":186,"in_reply_to_user_id":null,"created_at":"Sat Nov 30 23:02:16 +0000 2013","favorite_count":98,"id_str":"406921147427852288","place":null,"user":{"location":"","default_profile":false,"profile_background_tile":false,"statuses_count":36621,"lang":"en","profile_link_color":"004287","profile_banner_url":"https:\/\/pbs.twimg.com\/profile_banners\/759251\/1384971184","id":759251,"following":null,"favourites_count":4,"protected":false,"profile_text_color":"000000","contributors_enabled":false,"verified":true,"description":"Bringing you breaking news and t
11-30 22:54:52.273: W/System.err(18610): at com.android.volley.toolbox.JsonObjectRequest.parseNetworkResponse(JsonObjectRequest.java:73)
11-30 22:54:52.273: W/System.err(18610): at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:116)
11-30 22:54:52.293: W/System.err(18610): Caused by: org.json.JSONException: Value [{"contributors":null,"text":"18-propeller copter might be the future of personal air travel, inventors say.\nhttp:\/\/t.co\/TMUtbF80Kp via @CNNTech","geo":null,"retweeted":false,"in_reply_to_screen_name":null,"possibly_sensitive":false,"truncated":false,"lang":"en","entities":{"urls":[{"display_url":"cnn.it\/1bWid4q","expanded_url":"http:\/\/cnn.it\/1bWid4q","indices":[79,101],"url":"http:\/\/t.co\/TMUtbF80Kp"}],"hashtags":[],"user_mentions":[{"id":42703075,"indices":[106,114],"screen_name":"cnntech","id_str":"42703075","name":"cnntech"}],"symbols":[]},"in_reply_to_status_id_str":null,"id":406951229278146560,"in_reply_to_user_id_str":null,"source":"<a href=\"http:\/\/www.hootsuite.com\" rel=\"nofollow\">HootSuite<\/a>","favorited":false,"in_reply_to_status_id":null,"retweet_count":112,"in_reply_to_user_id":null,"created_at":"Sun Dec 01 01:01:48 +0000 2013","favorite_count":59,"id_str":"406951229278146560","place":null,"user":{"location":"","default_profile":false,"profile_background_tile":false,"statuses_count":36621,"lang":"en","profile_link_color":"004287","profile_banner_url":"https:\/\/pbs.twimg.com\/profile_banners\/759251\/1384971184","id":759251,"following":null,"favourites_count":4,"protected":false,"profile_text_color":"000000","contributors_enabled":false,"verified":true,"description":"Bringing you breaking news and the most talked about stories. Join the conversation and let’s connect!","profile_sidebar_border_color":"000000","name":"CNN","profile_background_color":"323232","created_at":"Fri Feb 09 00:35:02 +0000 2007","default_profile_image":false,"followers_count":11060197,"profile_image_url_https":"https:\/\/pbs.twimg.com\/profile_images\/378800000049679889\/9097753c470683f49aa12a6c15eba5c7_normal.jpeg","geo_enabled":false,"profile_background_image_url":"http:\/\/a0.twimg.com\/profile_background_images\/664730338\/60cc7d1f1b1a22a87ccccef026e15949.gif","profile_background_image_url_https":"https:\/\/si0.twimg.com\/profile_background_images\/664730338\/60cc7d1f1b1a22a87ccccef026e15949.gif","follow_request_sent":null,"entities":{"description":{"urls":[]},"url":{"urls":[{"display_url":"cnn.com","expanded_url":"http:\/\/www.cnn.com","indices":[0,22],"url":"http:\/\/t.co\/Db6JkaxJ9R"}]}},"url":"http:\/\/t.co\/Db6JkaxJ9R","utc_offset":-18000,"time_zone":"Eastern Time (US & Canada)","notifications":null,"profile_use_background_image":true,"friends_count":818,"profile_sidebar_fill_color":"EEEEEE","screen_name":"CNN","id_str":"759251","profile_image_url":"http:\/\/pbs.twimg.com\/profile_images\/378800000049679889\/9097753c470683f49aa12a6c15eba5c7_normal.jpeg","is_translator":false,"listed_count":88693},"coordinates":null},{"contributors":null,"text":"Will online classes make professors extinct? \nhttp:\/\/t.co\/g20MbYagb9 via @CNNOpinion","geo":null,"retweeted":false,"in_reply_to_screen_name":null,"possibly_sensitive":false,"truncated":false,"lang":"en","entities":{"urls":[{"display_url":"cnn.it\/1b4VUbw","expanded_url":"http:\/\/cnn.it\/1b4VUbw","indices":[46,68],"url":"http:\/\/t.co\/g20MbYagb9"}],"hashtags":[],"user_mentions":[{"id":259074538,"indices":[73,84],"screen_name":"CNNOpinion","id_str":"259074538","name":"CNN Opinion"}],"symbols":[]},"in_reply_to_status_id_str":null,"id":406921147427852288,"in_reply_to_user_id_str":null,"source":"<a href=\"http:\/\/www.hootsuite.com\" rel=\"nofollow\">HootSuite<\/a>","favorited":false,"in_reply_to_status_id":null,"retweet_count":186,"in_reply_to_user_id":null,"created_at":"Sat Nov 30 23:02:16 +0000 2013","favorite_count":98,"id_str":"406921147427852288","place":null,"user":{"location":"","default_profile":false,"profile_background_tile":false,"statuses_count":36621,"lang":"en","profile_link_color":"004287","profile_banner_url":"https:\/\/pbs.twimg.com\/profile_banners\/759251\/1384971184","id":759251,"following":null,"favourites_count":4,"protected":false,"profile_text_color":"000000","contributors_enabled":false,"verified":true,"description":"Bringing you breaking news and the most talked about
11-30 22:54:52.293: W/System.err(18610): at org.json.JSON.typeMismatch(JSON.java:111)
11-30 22:54:52.293: W/System.err(18610): at org.json.JSONObject.<init>(JSONObject.java:158)
11-30 22:54:52.293: W/System.err(18610): at org.json.JSONObject.<init>(JSONObject.java:171)
11-30 22:54:52.293: W/System.err(18610): at com.android.volley.toolbox.JsonObjectRequest.parseNetworkResponse(JsonObjectRequest.java:68)
11-30 22:54:52.293: W/System.err(18610): ... 1 more
11-30 22:56:51.289: W/IInputConnectionWrapper(18610): setComposingText on inactive InputConnection
这是java文件。
更新TweetRequest.java
public class TweetsRequest extends JsonArrayRequest {
public TweetsRequest(String url, Listener<JSONArray> listener, ErrorListener errorListener,
List<NameValuePair> params) {
super(url + "?" + URLEncodedUtils.format(params, "UTF-8"), listener, errorListener);
}
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> headers = new HashMap<String, String>();
String auth = "Bearer " + TwitterValues.ACCESS_TOKEN;
headers.put("Authorization", auth);
return headers;
}
}
更新TweetLoader.java
public class TweetLoader implements OnEndReachedListener {
private static final String LIST_URL = "https://api.twitter.com/1.1/statuses/user_timeline.json";
protected static final String TAG = TweetLoader.class.getSimpleName();
private ArrayAdapter<JSONObject> tweetAdapter;
private TweetJsonListener mDownListener = new TweetJsonListener();
private String query = "cnn";
private Activity activity;
public TweetLoader(ArrayAdapter<JSONObject> tweetAdapter, Activity activity) {
this.tweetAdapter = tweetAdapter;
this.activity = activity;
}
public void setQuery(String query) {
tweetAdapter.clear();
this.query = query;
onEndReached();
}
@Override
public void onEndReached() {
activity.setProgressBarIndeterminate(true);
activity.setProgressBarIndeterminateVisibility(true);
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("screen_name", "cnn"));
MainActivity.mRequestQueue.add(new TweetsRequest(LIST_URL, mDownListener, new ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.w(TAG, "Error with request");
error.printStackTrace();
}
}, params));
}
private class TweetJsonListener implements Listener<JSONArray> {
public void onResponse(JSONObject response) {
JSONObject jsonObject = null;
JSONArray tweets = response.optJSONArray("statuses");
int count = tweets != null ? tweets.length() : 0;
for (int i = 0; i < count; i++) {
jsonObject = tweets.optJSONObject(i);
if (jsonObject != null) {
tweetAdapter.add(jsonObject);
}
}
activity.setProgressBarIndeterminateVisibility(false);
}
@Override
public void onResponse(JSONArray arg0) {
// TODO Auto-generated method stub
}
}
}
TweetAdapter.java
public class TweetAdapter extends ArrayAdapter<JSONObject> {
private static final String TAG = TweetAdapter.class.getSimpleName();
public TweetAdapter(Context context) {
super(context, 0);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.twitter_item, null);
holder = new ViewHolder();
holder.imageView = (NetworkImageView) convertView.findViewById(R.id.profile_image);
holder.nameView = (TextView) convertView.findViewById(R.id.name);
holder.textView = (TextView) convertView.findViewById(R.id.text);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
JSONObject currentItem = getItem(position);
if (currentItem.length() == 0) {
holder.nameView.setText(R.string.loading);
holder.textView.setText("");
holder.imageView.setImageResource(R.drawable.ic_launcher);
} else {
try {
JSONObject user = currentItem.getJSONObject("user");
holder.nameView.setText(user.optString("name", "<No name>"));
holder.imageView.setImageUrl(user.getString("profile_image_url"), MainActivity.mImageLoader);
} catch (JSONException e) {
e.printStackTrace();
}
holder.textView.setText(currentItem.optString("text", "<No text>"));
}
return convertView;
}
private static class ViewHolder {
private NetworkImageView imageView;
private TextView nameView;
private TextView textView;
}
}
答案 0 :(得分：0)
您没有发布TweetRequest类的实现，但是如果我必须做出有根据的猜测，我猜它是从JsonRequest类继承而自动转换字符串响应进入JSON 对象。
问题是，您收到的回复是JSON 数组。
因此，如果我的猜测是正确的，那么您的TweetRequest应该继承JsonArrayRequest。
我是否正确阅读了情况？
好的，尝试这个怎么样：
而不是将JsonObject转换为JsonArray，而是将您的请求作为数组请求：
public class TweetsRequest extends JsonArrayRequest {
// basically the same implementation you have now
}
您需要更新您的听众，因为现在响应为JsonArray。
您似乎已经遗漏了JSONObject请求和听众。这应该是您的TweetJsonListener - 请注意我只使用正确的方法覆盖并将您的实现粘贴到其中。我没有验证你的逻辑
private class TweetJsonListener implements Listener<JSONArray> {
@Override
public void onResponse(JSONArray response) {
JSONObject jsonObject = null;
JSONArray tweets = response.optJSONArray("statuses");
int count = tweets != null ? tweets.length() : 0;
for (int i = 0; i < count; i++) {
jsonObject = tweets.optJSONObject(i);
if (jsonObject != null) {
tweetAdapter.add(jsonObject);
}
activity.setProgressBarIndeterminateVisibility(false);
}
}