java - Android JSON 解析导致应用程序 AsyncTask 崩溃

Question

我正在使用 JSON 解析器从 JSON 文件中读取数据并将其显示在我的应用程序中，我最初使用此代码来创建工作正常的数组，但现在我已将其粘贴到新应用程序中以使其获得来自 JSON 的数据并将其放入不起作用的文本字段中。我将在下面发布代码和错误日志。

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): error 0x3009 (EGL_BAD_MATCH) W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0x91199f00, error=EGL_BAD_MATCH E/EGL_emulation: tid 2593: eglSurfaceAttrib(1174): error 0x3009 (EGL_BAD_MATCH) W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0x8f2f5000, error=EGL_BAD_MATCH E/SearchScreen: Response from 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

original thread that created a view hierarchy can touch its views. at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:6891) at android.view.ViewRootImpl.invalidateChildInParent(ViewRootImpl.java:1083) at android.view.ViewGroup.invalidateChild(ViewGroup.java:5205) at android.view.View.invalidateInternal(View.java:13656) at android.view.View.invalidate(View.java:13620) at android.view.View.invalidate(View.java:13604) at android.widget.TextView.checkForRelayout(TextView.java:7347) at android.widget.TextView.setText(TextView.java:4480) at android.widget.TextView.setText(TextView.java:4337) at android.widget.TextView.setText(TextView.java:4312) at com.example.curtisboylan.myapplication.TechnicianProfile$GetProfile.doInBackground(TechnicianProfile.java:72) at com.example.curtisboylan.myapplication.TechnicianProfile$GetProfile.doInBackground(TechnicianProfile.java:39) at android.os.AsyncTask$2.call(AsyncTask.java:305) at java.util.concurrent.FutureTask.run(FutureTask.java:237) at android.os.AsyncTask$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)  E/EGL_emulation: tid 2593: eglSurfaceAttrib(1174): error 0x3009 (EGL_BAD_MATCH) W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0x8f2f5080, error=EGL_BAD_MATCH E/WindowManager: android.view.WindowLeaked: Activity com.example.curtisboylan.myapplication.TechnicianProfile has leaked window DecorView@415df5e[] that was originally added here at android.view.ViewRootImpl.(ViewRootImpl.java:418) at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:331) at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93) at android.app.Dialog.show(Dialog.java:322) at com.example.curtisboylan.myapplication.TechnicianProfile$GetProfile.onPreExecute(TechnicianProfile.java:48) at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:620) at android.os.AsyncTask.execute(AsyncTask.java:567) at com.example.curtisboylan.myapplication.TechnicianProfile.onCreate(TechnicianProfile.java:36) at android.app.Activity.performCreate(Activity.java:6679) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) E/WindowManager: android.view.WindowLeaked: Activity com.example.curtisboylan.myapplication.TechnicianListView has leaked window DecorView@b6a1d55[] that was originally added here at android.view.ViewRootImpl.(ViewRootImpl.java:418) at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:331) at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93) at android.app.Dialog.show(Dialog.java:322) at com.example.curtisboylan.myapplication.TechnicianListView$GetContacts.onPreExecute(TechnicianListView.java:78) at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:620) at android.os.AsyncTask.execute(AsyncTask.java:567) at com.example.curtisboylan.myapplication.TechnicianListView.initViews(TechnicianListView.java:67) at com.example.curtisboylan.myapplication.TechnicianListView.onCreate(TechnicianListView.java:48) at android.app.Activity.performCreate(Activity.java:6679) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

Answer 1

您不能在doInBackground中进行任何UI操作。

将设置文本相关的内容放入AsyncTask的onPostExecute方法中

@Override
protected void onPostExecute(Void aVoid) {

}