Im still new with android and json please help me Im also getting Null Pointer Exception. What should I do? Thanks In Advance
Heres my code:
JSONArray ass=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ass_list);
new JSONParse().execute();
}
//JSON
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
@Override
protected void onPreExecute() {
}
@Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = jParser.getJSONFromUrl("http://192.168.43.252/mobappproj/asslist.php");
return json;
}
@Override
protected void onPostExecute(JSONObject json) {
final ArrayList<String> ids = new ArrayList<String>();
final ArrayList<String> assname = new ArrayList<String>();
final ArrayList<String> duedate = new ArrayList<String>();
final ArrayList<String> course = new ArrayList<String>();
final ArrayList<String> note = new ArrayList<String>();
try {
ass = json.getJSONArray("ass");
for(int i=0; i<ass.length(); i++){
JSONObject student = ass.getJSONObject(i);
ids.add(student.getString("id"));
assname.add(student.getString("assname"));
duedate.add(student.getString("duedate"));
course.add(student.getString("course"));
note.add(student.getString("note"));
}
final ListView listView = (ListView)findViewById(R.id.listView);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(AssList.this,android.R.layout.simple_list_item_1, android.R.id.text1, course);
// Assign adapter to ListView
listView.setAdapter(adapter);
// ListView Item Click Listener
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// ListView Clicked item value
String ass_id = ids.get(position);
String ass_name = assname.get(position);
String ass_date = duedate.get(position);
String ass_course = course.get(position);
String ass_note = note.get(position);
Intent i = new Intent(AssList.this, ViewAss.class);
i.putExtra("ass_id", ass_id);
i.putExtra("ass_name", ass_name);
i.putExtra("ass_date", ass_date);
i.putExtra("ass_course", ass_course);
i.putExtra("ass_note", ass_note);
startActivity(i);
}
});
} catch (JSONException e) {
e.printStackTrace();
}
}
}
This the error I get:
07-20 19:20:35.635 30660-30711/com.example.shaishai.assignmenttrackertry E/JSON Parser: Error parsing data org.json.JSONException: Value [] of type org.json.JSONArray cannot be converted to JSONObject
