如何从解析的json数据解析html？

Question

我试图解析json数据中的一些url，以便只从json中的url获取图像并将其显示为图片。但是我不断地从中得到错误，我不知道如何解决它（也就是说，我仍然是一个小菜鸟）。

我正在使用here中的代码，并稍微更改了json文件和代码。

这是代码

public class MainActivity extends Activity { 
// Log tag 
private static final String TAG = MainActivity.class.getSimpleName(); 

// Movies json url 
static final String url = "http://url"; 
ProgressDialog pDialog; 
List<Movie> movieList = new ArrayList<Movie>(); 
ListView listView; 
CustomListAdapter adapter; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    listView = (ListView) findViewById(R.id.list); 
    adapter = new CustomListAdapter(this, movieList); 
    listView.setAdapter(adapter); 

    pDialog = new ProgressDialog(this); 
    // Showing progress dialog before making http request 
    pDialog.setMessage("Loading..."); 
    pDialog.show(); 

    // changing action bar color 
    getActionBar().setBackgroundDrawable(
      new ColorDrawable(Color.parseColor("#1b1b1b"))); 

    // Creating volley request obj 
    JsonArrayRequest movieReq = new JsonArrayRequest(url, 
      new Response.Listener<JSONArray>() { 
       @Override 
       public void onResponse(JSONArray response) { 
        Log.d(TAG, response.toString()); 
        hidePDialog(); 

        // Parsing json 
        for (int i = 0; i < response.length(); i++) { 
         try { 
          Movie movie = new Movie(); 
          JSONObject obj = response.getJSONObject(i); 
          movie.setTitle(obj.getString("title")); 

          //here where I try to parse the string from json file 
          String url2= obj.getString("image"); 
          Document document = Jsoup.connect(url2).get(); 
          Elements img = document.select("div [class=ipsBox] img[src]"); 
          String imgSrc = img.attr("src"); 

          movie.setThumbnailUrl(imgSrc); 

          movie.setRating(((Number) obj.get("rating")) 
            .doubleValue()); 
          movie.setYear(obj.getInt("releaseYear")); 

          // Genre is json array 
          JSONArray genreArry = obj.getJSONArray("genre"); 
          ArrayList<String> genre = new ArrayList<String>(); 
          for (int j = 0; j < genreArry.length(); j++) { 
           genre.add((String) genreArry.get(j)); 
          } 
          movie.setGenre(genre); 


          // adding movie to movies array 
          movieList.add(movie); 


         } catch (JSONException e) { 
          // TODO Auto-generated catch block 
          e.printStackTrace(); 
         } catch (IOException e) { 
          // TODO Auto-generated catch block 
          e.printStackTrace(); 
         } 

        } 

        // notifying list adapter about data changes 
        // so that it renders the list view with updated data 
        adapter.notifyDataSetChanged(); 
       } 
      }, new Response.ErrorListener() { 
       @Override 
       public void onErrorResponse(VolleyError error) { 
        VolleyLog.d(TAG, "Error: " + error.getMessage()); 
        hidePDialog(); 

       } 
      }); 

    // Adding request to request queue 
    AppController.getInstance().addToRequestQueue(movieReq); 
} 


@Override 
public void onDestroy() { 
    super.onDestroy(); 
    hidePDialog(); 
} 

private void hidePDialog() { 
    if (pDialog != null) { 
     pDialog.dismiss(); 
     pDialog = null; 
    } 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
}} 

这是我用

[{ 
    "title": "Dawn of the Planet of the Apes", 
    "image": "http://bato.to/comic/_/comics/000000-ultra-black-r1425", 
    "rating": 8.3, 
    "releaseYear": 2014, 
    "genre": ["Action", "Drama", "Sci-Fi"] 
}, 
{ 
    "title": "District 9", 
    "image": "http://bato.to/comic/_/comics/g-edition-r886", 
    "rating": 8, 
    "releaseYear": 2009, 
    "genre": ["Action", "Sci-Fi", "Thriller"] 
}, 
{ 
    "title": "Transformers: Age of Extinction", 
    "image": "http://otherurl", 
    "rating": 6.3, 
    "releaseYear": 2014, 
    "genre": ["Action", "Adventure", "Sci-Fi"] 
}, 
{ 
    "title": "X-Men: Days of Future Past", 
    "image": "http://otherurl", 
    "rating": 8.4, 
    "releaseYear": 2014, 
    "genre": ["Action", "Sci-Fi", "Thriller"] 
}, 
{ 
    "title": "How to Train Your Dragon", 
    "image": "http://otherurl", 
    "rating": 8.2, 
    "releaseYear": 2010, 
    "genre": ["Animation", "Adventure", "Family"] 
}] 

我运行该程序后，它配有错误

的错误，我得到

12-13 21:54:55.701: E/AndroidRuntime(28628): FATAL EXCEPTION: main 
12-13 21:54:55.701: E/AndroidRuntime(28628): Process: info.androidhive.customlistviewvolley, PID: 28628 
12-13 21:54:55.701: E/AndroidRuntime(28628): android.os.NetworkOnMainThreadException 
12-13 21:54:55.701: E/AndroidRuntime(28628): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at java.net.InetAddress.getAllByName(InetAddress.java:214) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at com.android.okhttp.internal.Dns$1.getAllByName(Dns.java:28) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:216) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:122) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:292) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at com.android.okhttp.internal.http.HttpEngine.sendSocketRequest(HttpEngine.java:255) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:206) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:345) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:89) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:449) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:434) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:181) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at org.jsoup.helper.HttpConnection.get(HttpConnection.java:170) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at info.androidhive.customlistviewvolley.MainActivity$1.onResponse(MainActivity.java:77) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at info.androidhive.customlistviewvolley.MainActivity$1.onResponse(MainActivity.java:1) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at com.android.volley.toolbox.JsonRequest.deliverResponse(JsonRequest.java:65) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at android.os.Handler.handleCallback(Handler.java:733) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at android.os.Handler.dispatchMessage(Handler.java:95) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at android.os.Looper.loop(Looper.java:136) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at android.app.ActivityThread.main(ActivityThread.java:5146) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at java.lang.reflect.Method.invokeNative(Native Method) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at java.lang.reflect.Method.invoke(Method.java:515) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566) 
12-13 21:54:55.701: E/AndroidRuntime(28628): at dalvik.system.NativeStart.main(Native Method) 

的JSON

请帮助我，我真的很感激你的回答。

Answer 1

按this answer，我觉得您在开始分析之前需要这两行：

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); 
    StrictMode.setThreadPolicy(policy);