我是从url解析json的新手。昨天我尝试解析json简单数据。现在我很困惑，形成一个解析数据的json，如下所示。我仍然不能如何解析json中的数组和对象。请帮帮我们..
这里是我的MainActivity.java
public class MainActivity extends ListActivity {
/** Called when the activity is first created. */
private static String URL = "http://api.themoviedb.org/3/genre/18/movies?api_key=d397dd2d354f088c6f0eb91c6b160bb0";
// tag
private static final String TAG_ID = "id";
private static final String TAG_page = "page";
private static final String TAG_results = "results";
private static final String TAG_backdrop_path = "backdrop_path";
private static final String TAG_id = "id";
private static final String TAG_original_title = "original_title";
private static final String TAG_release_date = "release_date";
private static final String TAG_poster_path = "poster_path";
private static final String TAG_title = "title";
private static final String TAG_vote_average = "vote_average";
private static final String TAG_vote_count = "vote_count";
private static final String TAG_total_pages = "total_pages";
private static final String TAG_total_results = "total_results";
JSONArray results = null;
JSONArray id = null;
JSONArray page = null;
JSONArray pages = null;
JSONArray tot_result = null;
// panggil class parser
JSONparser parser = new JSONparser();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ArrayList<HashMap<String, String>> genreList = new ArrayList<HashMap<String, String>>();
JSONObject json = parser.getJSONFromUrl(URL);
try {
id = json.getJSONArray(TAG_ID);
page = json.getJSONArray(TAG_page);
pages = json.getJSONArray(TAG_total_pages);
tot_result = json.getJSONArray(TAG_total_results);
for (int i = 0; i < results.length(); i++) {
JSONObject data = results.getJSONObject(i);
String backdrop = data.getString(TAG_backdrop_path);
String idd = data.getString(TAG_id).toString();
String ori = data.getString(TAG_original_title);
String releas = data.getString(TAG_release_date);
String poster = data.getString(TAG_poster_path);
String title = data.getString(TAG_title);
String average = data.getString(TAG_vote_average);
String count = data.getString(TAG_vote_count);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_backdrop_path, backdrop);
map.put(TAG_ID, idd);
map.put(TAG_original_title, ori);
map.put(TAG_release_date, releas);
map.put(TAG_poster_path, poster);
map.put(TAG_title, title);
map.put(TAG_vote_average, average);
map.put(TAG_vote_count, count);
genreList.add(map);
}
// Sort by
/*********************************
* Collections.sort(genreList, new Comparator<HashMap<String,
* String>>() {
*
* @Override public int compare(HashMap<String, String> a,
* HashMap<String, String> b) { return
* a.get(TAG_NAMA).compareTo(b.get(TAG_ID)); } });
******************************/
} catch (JSONException e) {
// TODO: handle exception
e.printStackTrace();
}
// tampilkan ke listadapter
ListAdapter adapter = new SimpleAdapter(this, genreList,
R.layout.list_data, new String[] { TAG_ID, TAG_page,
TAG_results, TAG_backdrop_path, TAG_id,
TAG_original_title, TAG_release_date, TAG_poster_path,
TAG_title, TAG_vote_average, TAG_vote_count,
TAG_total_pages, TAG_total_results }, new int[] {
R.id.id, R.id.page, R.id.result, R.id.backdrop_path,
R.id.idd, R.id.original_title, R.id.release_date,
R.id.poster_path, R.id.title, R.id.vote_average,
R.id.vote_count, R.id.total_pages, R.id.total_results });
setListAdapter(adapter);
}
}
这里是我的JSONparser.java
public class JSONparser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
public JSONparser() {
}
public JSONObject getJSONFromUrl(String url) {
// http request
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
// TODO: handle exception
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO: handle exception
e.printStackTrace();
} catch (IOException e) {
// TODO: handle exception
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "utf-8"), 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) {
// TODO: handle exception
Log.e("BUffer Error", "Error converting result" + e.toString());
}
// try parse string to a json
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
// TODO: handle exception
Log.e("Json parser", "error parsing data" + e.toString());
}
return jObj;
}
}
这是我的json数据。
{
"id": 18,
"page": 1,
"results": [
{
"backdrop_path": "/6xKCYgH16UuwEGAyroLU6p8HLIn.jpg",
"id": 238,
"original_title": "The Godfather",
"release_date": "1972-03-24",
"poster_path": "/d4KNaTrltq6bpkFS01pYtyXa09m.jpg",
"title": "The Godfather",
"vote_average": 9.1999999999999993,
"vote_count": 125
},
{
"backdrop_path": "/ooqPNPS2WdBH7DgIF4em9e0nEld.jpg",
"id": 857,
"original_title": "Saving Private Ryan",
"release_date": "1998-07-24",
"poster_path": "/35CMz4t7PuUiQqt5h4u5nbrXZlF.jpg",
"title": "Saving Private Ryan",
"vote_average": 8.9000000000000004,
"vote_count": 83
}
],
"total_pages": 25,
"total_results": 499
}
答案 0 :(得分：1)
JSONObject jObject_Main= new JSONObject(jsonstring);
//get json simple string
String id = jObject_Main.getString("id");
String page = jObject_Main.getString("page");
//get json Array and parse it.
JSONArray jsonArray = jObject_Main
.getJSONArray("results");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
String backdrop_path=jsonObject.getString("backdrop_path");
}
我希望它对你有用。
答案 1 :(得分：1)
请在您的代码中更改此内容：
JSONObject json = parser.getJSONFromUrl(URL);
try {
id = json.getString("id");
page = json.getString("page");
tot_result = json.getJSONArray(results);
我希望你理解它。
答案 2 :(得分：0)
您的JSON是JSONObject，其中包含JSONArray
示例：
JSONObject jsonObj = new JSONObject(your_json_string);
String id = jsonObj.getString("id");
String page = jsonObj.getString("page"); // or getInt("page");
JSONArray results = jsonObj.getJSONArray("results");
int len = results.length(); // length or size, I don't remember, you can check it
for (int i = 0; i < len; i++) {
JSONObject obj = results.getJSONObject(i);
String backdropPath = obj.getString("backdrop_path");
// ...
}
答案 3 :(得分：0)
试试这个..
在全球：
中JSONArray results = null;
String id = null;
String page = null;
String pages = null;
String tot_result = null;
在尝试抓取：
内JSONObject json = parser.getJSONFromUrl(URL);
try {
id = json.getString(TAG_ID); // Changes here
page = json.getString(TAG_page); // Changes here
pages = json.getString(TAG_total_pages); // Changes here
tot_result = json.getString(TAG_total_results); // Changes here
results = json.getJSONArray(TAG_results); // Add this line
for (int i = 0; i < results.length(); i++) {
// Remaining all correct
}
修改
new DownloadImageTask()
.execute("your image url");
}
和 DownloadImageTask.class
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}
protected void onPostExecute(Bitmap result) {
imageview.setImageBitmap(result);
}
}
答案 4 :(得分：0)
你需要添加＆＃34; results = json.getJSONArray（TAG_results）;＆＃34;下面 ＆＃34; tot_result = json.getJSONArray（TAG_total_results）;＆＃34;