[英]Parsing multiple JsonObject and JsonArray
我在使用多个jsonobjects时遇到一些问题,我想使用“ posts”和“ attachments” jsonobjects。
但是我尝试使用该行和另一个for循环用于附件jsonObject,但是它不起作用。
String postInfo = jsonObject.getString("attachments");
我的Json看起来像这样:
{"posts":[
{"title":"Title","content":"Post content"}
]
}
{"attachments":[
{"url":"http://www.something.com"}
]
}
Java代码:
public class NewsActivity extends FragmentActivity {
ViewPager viewPager;
int category;
ArrayList titleList;
ArrayList postList;
ArrayList imgList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_news);
Intent i = getIntent();
category=i.getIntExtra("locationInfo",-1);
try {
String encodedCatName = URLEncoder.encode(Integer.toString(category), "UTF-8");
DownloadTask task = new DownloadTask();
task.execute("http://www.something.co/api/get_category_posts/?id=" + encodedCatName);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
// Toast.makeText(getApplicationContext(), "Could not find weather", Toast.LENGTH_LONG);
}
}
public class DownloadTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
postList = new ArrayList();
titleList = new ArrayList();
imgList = new ArrayList();
String result = "";
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(urls[0]);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream in = urlConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(in);
int data = reader.read();
while (data != -1) {
char current = (char) data;
result += current;
data = reader.read();
}
return result;
} catch (Exception e) {
Toast.makeText(getApplicationContext(), "Could not find", Toast.LENGTH_LONG);
}
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
try {
String message = "";
JSONObject jsonObject = new JSONObject(result);
String postInfo = jsonObject.getString("posts");
Log.i("Content", postInfo);
JSONArray arr = new JSONArray(postInfo);
JSONArray attachments = jsonObject.getJSONArray("attachments");
for(int i=0; i< attachments.length(); i++){
String url = "";
url = attachments.getJSONObject(i).getString("url");
imgList.add(url);
}
for (int i = 0; i < arr.length(); i++) {
JSONObject jsonPart = arr.getJSONObject(i);
String title = "";
String post = "";
title = jsonPart.getString("title");
post = jsonPart.getString("content");
if (title != "" && post != "") {
message += title + ": " + post + "\r\n";
titleList.add(title);
postList.add(post);
}
}
viewPager = (ViewPager) findViewById(R.id.view_pager);
SwipeAdapter swipeAdapter = new SwipeAdapter(getSupportFragmentManager(),category,titleList,postList,imgList);
viewPager.setAdapter(swipeAdapter);
} catch (JSONException e) {
Toast.makeText(getApplicationContext(), "Could not find ", Toast.LENGTH_LONG);
}
}
}
}
与“ attachments”相关的类型是一个数组,因此您应该调用以下内容:
JSONArray attachments = jsonObject.getJSONArray("attachments")
for(int i=0; i< attachments.length(); i++){
attachments.getJSONObject(i).getString("url");
}
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