I am having difficulties Parsing JSON to Alert Dialog, getting Null Pointer Exception

Question

I am a beginner in android development. I am working on an android app that has a 'verse of the day' feature. I have been trying for a while to parse JSON object from URL to appear in Alert Dialog when the item is selected in my options menu but up till now, i am yet to make any success. Here is my Code:

private TextView textView;


     public boolean onOptionsItemSelected(MenuItem item) {
                    LayoutInflater inflater = (LayoutInflater) 
      getSystemService(Context.LAYOUT_INFLATER_SERVICE);


         View verseofTheDay = inflater.inflate(R.layout.my_verse, null);
                switch (item.getItemId())

     case R.id.bible:
                    AlertDialog.Builder verseofday = new AlertDialog.Builder(this);
                    verseofday.setCancelable(true);
                    verseofday.setView(verseofTheDay);
                    textView = (TextView) findViewById(R.id.verseDay);
                    verseofday.show();
                    new JSONTask().execute("http://app.wordedfm.com/api/scripture");
                    break;
            }
            return super.onOptionsItemSelected(item);
        }

    And here is my JSON class:
    public class JSONTask extends AsyncTask<String, String, String>{

            @Override
            protected String 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);
                    }
                    return buffer.toString();
                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } finally {
                    if (connection != null) {
                        connection.disconnect();
                    }
                    try {
                        if (reader != null){
                            reader.close();
                        }

                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                return null;
            }

            @Override
            protected void onPostExecute(String result) {
                super.onPostExecute(result);
                textView.setText(result);
            }
        }
    }

But everytime i get this error:

.support.v7.widget.AppCompatImageHelper.hasOverlappingRendering
06-02 05:08:46.983 16307-16307/com.musicianfocus.ben.wordedfm E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                java.lang.NullPointerException
                                                                                    at com.musicianfocus.ben.wordedfm.MainActivity$JSONTask.onPostExecute(MainActivity.java:209)
                                                                                    at com.musicianfocus.ben.wordedfm.MainActivity$JSONTask.onPostExecute(MainActivity.java:199)
                                                                                    at android.os.AsyncTask.finish(AsyncTask.java:631)
                                                                                    at android.os.AsyncTask.access$600(AsyncTask.java:177)
                                                                                    at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
                                                                                    at android.os.Handler.dispatchMessage(Handler.java:99)
                                                                                    at android.os.Looper.loop(Looper.java:137)
                                                                                    at android.app.ActivityThread.main(ActivityThread.java:4745)
                                                                                    at java.lang.reflect.Method.invokeNative(Native Method)
                                                                                    at java.lang.reflect.Method.invoke(Method.java:511)
                                                                                    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
                                                                                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
                                                                                    at dalvik.system.NativeStart.main(Native Method)

Because your textview reference is null. Use textView = (TextView) verseofTheDay.findViewById(R.id.verseDay); — Mayank Bhatnagar, Jun 03 '17 at 06:51

score 0 · Answer 1 · answered Jun 03 '17 at 06:52

0

The string returned in the onPost Method is null. You need to store the result from JSON in different variable. And use the method toString().

Hope this helps.

answered Jun 03 '17 at 06:52

Sarthak Gandhi

2,130
1
16
23

I am having difficulties Parsing JSON to Alert Dialog, getting Null Pointer Exception

1 Answers1