Hello guys i want to populate a listview with the database items. But using any JOIN(inner, left or right) to merge my two tables in order to view the selected items in table 1 and table 2.
Here is my PHP Code:
<?php
$link = mysql_pconnect("localhost", "root", "") or die("Could not connect");
mysql_select_db("dbmobile_class_record") or die("Could not select database");
$arr = array();
$rs = mysql_query("SELECT tb_student.stud_id, tb_student.stud_name, tb_attendance.remark FROM tb_student LEFT JOIN tb_attendance ON tb_student.stud_id=tb_attendance.stud_id");
while($obj = mysql_fetch_object($rs)) {
$arr[] = $obj;
}
echo ''.json_encode($arr).'';
?>
This is the JSON:
[
{
"stud_id":"20131299",
"stud_name":"Angelo Velayo",
"remark":"Present"
},
{
"stud_id":"20131296",
"stud_name":"Jeffrey Oliveras",
"remark":"Present"
}
]
as you can see the query works and it merge the two tables.
and this is my Java file:
public class ViewAttendance extends AppCompatActivity {
private static final String TAG = ViewAttendance.class.getSimpleName();
private static final String url = "http://10.0.2.2/MobileClassRecord/getStudentAttendance.php";
private ProgressDialog pDialog;
private List<StudentAttendanceList> studAttList = new ArrayList<>();
private ListView mylistView;
private CustomStudAttendanceListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_attendance);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mylistView = (ListView) findViewById(R.id.list);
adapter = new CustomStudAttendanceListAdapter(this, studAttList);
mylistView.setAdapter(adapter);
mylistView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
});
pDialog = new ProgressDialog(this);
pDialog.setMessage("Loading...");
pDialog.show();
JsonArrayRequest request = new JsonArrayRequest(url, new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
for (int i = 0; i < response.length(); i++) {
try {
JSONObject jsonObject = response.getJSONObject(i);
StudentAttendanceList sAttList = new StudentAttendanceList();
sAttList.setId(jsonObject.getString("stud_id"));
sAttList.setName(jsonObject.getString("student_name"));
sAttList.setRemark(jsonObject.getString("remark"));
studAttList.add(sAttList);
} catch (JSONException e) {
e.printStackTrace();
}
}
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
VolleyLog.d(TAG, "Error: " + volleyError.getMessage());
hidePDialog();
}
});
AppController.getInstance().addToRequestQueue(request);
}
@Override
protected void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
and this is the tutorial that i have followed in populating the list view
My Problem: The items is not showing in the listview