Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>You are getting this error because you are trying to access the View object from the doInBackground method, like Name.setText( course.getString(TAG_Name)); You must move all your UI updates to the onPostExecute method.</p> <p>Can you test this implementation: </p> <pre><code>import android.app.Activity; import java.util.ArrayList; import java.util.List; import org.apache.http.NameValuePair; import org.apache.http.message.BasicNameValuePair; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.app.ProgressDialog; import android.content.Intent; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; import android.widget.TextView; public class ViewCourseStudent extends Activity { TextView Name; TextView Description; TextView OfficeHours; TextView CreditHours; TextView MaxAbsenceDays; TextView ExamsDates ; String CourseID ; // Progress Dialog private ProgressDialog pDialog; // JSON parser class JSONParser jsonParser = new JSONParser(); // single course url private static final String url_course_detials = "http://10.0.2.2/SmsPhp/view_course.php"; //JSON Node names private static final String TAG_SUCCESS = "success"; private static final String TAG_CourseID = "CourseID"; private static final String TAG_course = "course"; private static final String TAG_Name = "Name"; private static final String TAG_OfficeHours = "OfficeHours"; private static final String TAG_CreditHours = "CreditHours"; private static final String TAG_Description = "Description"; private static final String TAG_MaxAbsenceDays = "MaxAbsenceDays"; private static final String TAG_ExamsDates = "ExamsDates"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.view_course); Intent i = getIntent(); CourseID = i.getStringExtra(TAG_CourseID); // Getting complete course details in background thread new GetCourseDetails().execute(); } /** * Background Async Task to Get complete course details * */ class GetCourseDetails extends AsyncTask&lt;String, String, String&gt; { private JSONObject course; /** * Before starting background thread Show Progress Dialog * */ @Override protected void onPreExecute() { super.onPreExecute(); pDialog = new ProgressDialog(ViewCourseStudent.this); pDialog.setMessage("Loading course details. Please wait..."); pDialog.setIndeterminate(false); pDialog.setCancelable(true); pDialog.show(); } @Override protected String doInBackground(String... arg0) { // updating UI from Background Thread // Check for success tag int success; try { // Building Parameters List&lt;NameValuePair&gt; params = new ArrayList&lt;NameValuePair&gt;(); params.add(new BasicNameValuePair("CourseID", CourseID)); // getting course details by making HTTP request // Note that product details url will use GET request JSONObject json = jsonParser.makeHttpRequest( url_course_detials, "GET", params); // check your log for json response Log.d("Single course Details", json.toString()); // json success tag success = json.getInt(TAG_SUCCESS); if (success == 1) { // successfully received product details JSONArray courseObj = json .getJSONArray(TAG_course); // JSON Array // get first course object from JSON Array course = courseObj.getJSONObject(0); }else{ // course with course id not found course = null; } } catch (JSONException e) { e.printStackTrace(); } return null; } /** * After completing background task Dismiss the progress dialog * **/ protected void onPostExecute(String file_url) { // dismiss the dialog once got all details pDialog.dismiss(); if(course != null){ Name = (TextView) findViewById(R.id.C_Name); Description = (TextView) findViewById(R.id.C_Des); CreditHours = (TextView) findViewById(R.id.C_Hours); OfficeHours=(TextView) findViewById(R.id.C_Ohour); MaxAbsenceDays=(TextView) findViewById(R.id.C_absence); ExamsDates=(TextView) findViewById(R.id.Add_C_Exam); // display product data in EditText Name.setText( course.getString(TAG_Name)); Description.setText( course.getString(TAG_Description)); OfficeHours.setText( course.getString(TAG_OfficeHours)); MaxAbsenceDays.setText( course.getString(TAG_MaxAbsenceDays)); ExamsDates.setText( course.getString(TAG_ExamsDates)); CreditHours.setText( course.getString(TAG_CreditHours)); } } } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. PORetrieve from MySQL database does not work
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USAnis BEN NSIR
    1. USAnis BEN NSIR
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    1. COso do you mean i remove start from Name = (TextView) >>>> until CreditHours.setText( course.getString(TAG_CreditHours)); to onPostExecute after this line pDialog.dismiss(); right ?
      singulars
      1. PO
      1. USuser1682578
    2. COyes, you should separate background process and UI process. You are hacking the MVC pattern.
      singulars
      1. PO
      1. USAnis BEN NSIR
    3. CO09-21 01:25:19.275: E/AndroidRuntime(6889): FATAL EXCEPTION: main 09-21 01:25:19.275: E/AndroidRuntime(6889): java.lang.NullPointerException 09-21 01:25:19.275: E/AndroidRuntime(6889): at com.ksu.sms.ViewCourseStudent$GetCourseDetails.onPostExecute(ViewCourseStudent.java:141) 09-21 01:25:19.275: E/AndroidRuntime(6889): at com.ksu.sms.ViewCourseStudent$GetCourseDetails.onPostExecute
      singulars
      1. PO
      1. USuser1682578
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload