Question

处理：com.example.dell.api，PID：22968 java.lang.RuntimeException：执行doInBackground（）时发生错误在android.os.AsyncTask $ 3.done（AsyncTask.java:304）在java.util.concurrent.FutureTask.finishCompletion（FutureTask.java:355） at java.util.concurrent.FutureTask.setException（FutureTask.java:222）在java.util.concurrent.FutureTask.run（FutureTask.java:242）在android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:231） at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1112） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:587）在java.lang.Thread.run（Thread.java:818）引起：java.lang.SecurityException：权限被拒绝（缺少INTERNET权限？） at java.net.InetAddress.lookupHostByName（InetAddress.java:451） at java.net.InetAddress.getAllByNameImpl（InetAddress.java:252）在java.net.InetAddress.getAllByName（InetAddress.java:215）在com.android.okhttp.HostResolver $ 1.getAllByName（HostResolver.java:29）在com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress（RouteSelector.java:232）在com.android.okhttp.internal.http.RouteSelector.next（RouteSelector.java:124）在com.android.okhttp.internal.http.HttpEngine.connect（HttpEngine.java:370）在com.android.okhttp.internal.http.HttpEngine.sendRequest（HttpEngine.java:298）在com.android.okhttp.internal.http.HttpURLConnectionImpl.execute（HttpURLConnectionImpl.java:399）在com.android.okhttp.internal.http.HttpURLConnectionImpl.connect（HttpURLConnectionImpl.java:110）在com.android.okhttp.internal.http.DelegatingHttpsURLConnection.connect（DelegatingHttpsURLConnection.java:89）在com.android.okhttp.internal.http.HttpsURLConnectionImpl.connect（HttpsURLConnectionImpl.java:25） at com.example.dell.api.MainActivity $ JSONTask.doInBackground（MainActivity.java:147） at com.example.dell.api.MainActivity $ JSONTask.doInBackground（MainActivity.java:131）在android.os.AsyncTask $ 2.call（AsyncTask.java:292）在java.util.concurrent.FutureTask.run（FutureTask.java:237）在android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:231） at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1112） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:587）在java.lang.Thread.run（Thread.java:818）

这是我的代码：

    protected List<MovieModel> doInBackground(String... params) {
        HttpURLConnection connection = null;
        BufferedReader reader = null;

        try {
            URL url = new URL(params[0]);
            connection = (HttpURLConnection) url.openConnection();
            connection.connect();
            InputStream stream = connection.getInputStream();
            reader = new BufferedReader(new InputStreamReader(stream));
            StringBuffer buffer = new StringBuffer();
            String line = "";
            while ((line = reader.readLine()) != null) {
                buffer.append(line);
            }

            String finalJson = buffer.toString();

            JSONObject parentObject = new JSONObject(finalJson);
            JSONArray parentArray = parentObject.getJSONArray("movies");

            List<MovieModel> movieModelList = new ArrayList<>();

            Gson gson = new Gson();
            for (int i = 0; i < parentArray.length(); i++) {
                JSONObject finalObject = parentArray.getJSONObject(i);
                /**
                 * below single line of code from Gson saves you from writing the json parsing yourself
                 * which is commented below
                 */
                MovieModel movieModel = gson.fromJson(finalObject.toString(), MovieModel.class); // a single line json parsing using Gson
                movieModel.setMovie(finalObject.getString("movie"));
                movieModel.setYear(finalObject.getInt("year"));
                movieModel.setRating((float) finalObject.getDouble("rating"));
                movieModel.setDirector(finalObject.getString("director"));

                movieModel.setDuration(finalObject.getString("duration"));
                movieModel.setTagline(finalObject.getString("tagline"));
                movieModel.setImage(finalObject.getString("image"));
                movieModel.setStory(finalObject.getString("story"));

                List<MovieModel.Cast> castList = new ArrayList<>();
                for (int j = 0; j < finalObject.getJSONArray("cast").length(); j++) {
                    MovieModel.Cast cast = new MovieModel.Cast();
                    cast.setName(finalObject.getJSONArray("cast").getJSONObject(j).getString("name"));
                    castList.add(cast);
                }
                movieModel.setCastList(castList);
                // adding the final object in the list
                movieModelList.add(movieModel);
            }
            return movieModelList;

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.disconnect();
            }
            try {
                if (reader != null) {
                    reader.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
enter code here

Answer 1

您忘记在此清单中添加INTERNET权限，

<uses-permission android:name="android.permission.INTERNET" />

java.lang.RuntimeException：执行doInBackground时发生错误（

1 个答案: