Android JSON解析崩溃的应用程序异步任务

Question

我正在使用一个JSON解析器从我的JSON文件中读取数据并将其显示在我的应用程序中，我最初使用这段代码创建数组，它工作良好，但现在我已经将它粘贴到一个新的应用程序中，使它从JSON获取数据并将其放到一个不工作的文本字段中。我会在下面贴出代码和错误日志。

package com.example.curtisboylan.myapplication;

import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;



public class TechnicianProfile extends AppCompatActivity {

    private static String url;
    private String TAG = SearchScreen.class.getSimpleName();
    private ProgressDialog pDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_technician_profile);
        Bundle bundle = getIntent().getExtras();
        String username = bundle.getString("username");
        String userid = bundle.getString("userid");

        setTitle("Technician - " + username);
        url = "http://curtisboylan.me/mygeek/mygeekprofile.php?user=" + userid;

        Log.d("test", url);

        new GetProfile().execute();

    }
    private class GetProfile extends AsyncTask<Void, Void, Void> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // Showing progress dialog
            pDialog = new ProgressDialog(TechnicianProfile.this);
            pDialog.setMessage("Please Wait..");
            pDialog.setCancelable(false);
            pDialog.show();

        }

        @Override
        protected Void doInBackground(Void... arg0) {
            HttpHandler sh = new HttpHandler();

            // Making a request to url and getting response
            String jsonStr = sh.makeServiceCall(url);

            Log.e(TAG, "Response from url: " + jsonStr);

            if (jsonStr != null) {
                try {
                    JSONObject jsonObj = new JSONObject(jsonStr);

                    // Getting JSON Array node
                    JSONArray contacts = jsonObj.getJSONArray("MyGeek");
                    TextView usernametext;
                    // looping through All Contacts

                        JSONObject c = contacts.getJSONObject(0);
                        usernametext = (TextView) TechnicianProfile.this.findViewById(R.id.abouttext);
                        usernametext.setText(c.getString("name"));
                        // username.add(c.getString("name"));
                        // userid.add(c.getString("id"));
                        // location.add(c.getString("location"));
                        // reviewscore.add(c.getString("reviewscore"));
                        //  price.add(c.getString("price"));
                        // urllist.add(c.getString("url"));




                } catch (final JSONException e) {
                    Log.e(TAG, "Json parsing error: " + e.getMessage());
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(getApplicationContext(),
                                    "Json parsing error: " + e.getMessage(),
                                    Toast.LENGTH_LONG)
                                    .show();
                        }
                    });

                }
            } else {
                Log.e(TAG, "Couldn't get json from server.");
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(),
                                "Couldn't get json from server. Check LogCat for possible errors!",
                                Toast.LENGTH_LONG)
                                .show();
                    }
                });

            }

            return null;
        }
    }
}

d/test:http://curtisboylan.me/mygeek/mygeekprofile.php？user=1 e/egl_emulation:tid 2593:eglSurfaceAttrib(1174):错误0x3009(EGL_BAD_MATCH)w/openglrenderer:无法在表面0x91199F00上设置EGL_SWAP_BEHAVIOR,错误=EGL_BAD_MATCH e/egl_emulation:tid 2593:eglSurfaceAttrib(1174):错误0x3009(EGL_BAD_MATCH)w/openglrenderer:无法在表面0x8F2F5000上设置EGL_SWAP_BEHAVIOR,错误=EGL_BAD_MATCH e/searchscreen:响应来自URL：{“MyGeek”：[{“ID”：“1”,“Name”：“Curtis Boylan”,“Location”：“Swords,Co Dublin”,“ReviewScore”：“5.6”,“URL”：“https://sContent-lhr3-1.xx.fbcdn.net/v/T1.0-9/11062691_831452480236559_1123476984274233173_n.jpg？OH=8eb4BB9519A2CD3B96B085146B0AE718&OE=596BBB5F”,“Price”：“30”}]}

            --------- beginning of crash E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #2
              Process: com.example.curtisboylan.myapplication, PID: 2416
              java.lang.RuntimeException: An error occurred while executing doInBackground()
                  at android.os.AsyncTask$3.done(AsyncTask.java:325)
                  at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
                  at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
                  at java.util.concurrent.FutureTask.run(FutureTask.java:242)
                  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
                  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
                  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
                  at java.lang.Thread.run(Thread.java:761)
               Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException: Only the

Answer 1

您不能在doinbackground中执行任何UI操作。

在AsyncTask的OnPostExecute方法中放置与设置文本相关的内容

@Override
protected void onPostExecute(Void aVoid) {

}