import
android.os.Bundle;
import
android.view.View;
import
android.widget.ProgressBar;
import
android.widget.Toast;
import
androidx.appcompat.app.AppCompatActivity;
import
androidx.core.widget.NestedScrollView;
import
androidx.recyclerview.widget.LinearLayoutManager;
import
androidx.recyclerview.widget.RecyclerView;
import
com.android.volley.Request;
import
com.android.volley.RequestQueue;
import
com.android.volley.Response;
import
com.android.volley.VolleyError;
import
com.android.volley.toolbox.JsonArrayRequest;
import
com.android.volley.toolbox.Volley;
import
org.json.JSONArray;
import
org.json.JSONException;
import
org.json.JSONObject;
import
java.util.ArrayList;
public
class
MainActivity
extends
AppCompatActivity {
int
count =
0
;
private
ArrayList<CourseModal> courseArrayList;
private
RecyclerView courseRV;
private
CourseRVAdapter courseRVAdapter;
private
ProgressBar loadingPB;
private
NestedScrollView nestedSV;
@Override
protected
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
courseRV = findViewById(R.id.idRVCourses);
loadingPB = findViewById(R.id.idPBLoading);
nestedSV = findViewById(R.id.idNestedSV);
courseArrayList =
new
ArrayList<>();
getData();
LinearLayoutManager manager =
new
LinearLayoutManager(
this
);
courseRV.setLayoutManager(manager);
nestedSV.setOnScrollChangeListener(
new
NestedScrollView.OnScrollChangeListener() {
@Override
public
void
onScrollChange(NestedScrollView v,
int
scrollX,
int
scrollY,
int
oldScrollX,
int
oldScrollY) {
if
(scrollY == v.getChildAt(
0
).getMeasuredHeight() - v.getMeasuredHeight()) {
count++;
loadingPB.setVisibility(View.VISIBLE);
if
(count <
20
) {
getData();
}
}
}
});
}
private
void
getData() {
RequestQueue queue = Volley.newRequestQueue(MainActivity.
this
);
JsonArrayRequest jsonArrayRequest =
new
JsonArrayRequest(Request.Method.GET, url,
null
,
new
Response.Listener<JSONArray>() {
@Override
public
void
onResponse(JSONArray response) {
courseRV.setVisibility(View.VISIBLE);
for
(
int
i =
0
; i < response.length(); i++) {
try
{
JSONObject responseObj = response.getJSONObject(i);
String courseName = responseObj.getString(
"courseName"
);
String courseTracks = responseObj.getString(
"courseTracks"
);
String courseMode = responseObj.getString(
"courseMode"
);
String courseImageURL = responseObj.getString(
"courseimg"
);
courseArrayList.add(
new
CourseModal(courseName, courseMode, courseTracks, courseImageURL));
courseRVAdapter =
new
CourseRVAdapter(MainActivity.
this
, courseArrayList);
courseRV.setAdapter(courseRVAdapter);
}
catch
(JSONException e) {
e.printStackTrace();
}
}
}
},
new
Response.ErrorListener() {
@Override
public
void
onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.
this
,
"Fail to get the data.."
, Toast.LENGTH_SHORT).show();
}
});
queue.add(jsonArrayRequest);
}
}