I have a gridview. On clicking any item from the gridview , I am going to a viewpager/FragmentStatePagerAdapter with all the items of gridview. I want the view pager to show the selected item. Viewpager is loading the first item always. How to solve this issue?
Activity:
I am receiving the selected option from gridview in BuyActivity Intent intent = getIntent(); pos = intent.getIntExtra("selected",0);
public class BuyActivity extends AppCompatActivity {
SharedPreferences preferences,sharedPreferences;
final String[] categoryName = new String[]{"Science","Arts","Engineering","Medical"};
ArrayList<Integer> choices = new ArrayList<>();
ArrayList<BuyHorizontalPageModel> buyList = new ArrayList<>();
ViewPager viewPager;
int selected;
BuySwipeAdapter swipeAdapter;
int pos;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_buy);
preferences = this.getSharedPreferences("com.example.sabmad.basenav", Context.MODE_PRIVATE);
//preferences = this.getSharedPreferences("com.example.sabmad.basenav", Context.MODE_PRIVATE);
int choiceSingle = preferences.getInt("single",0);
int choiceFilter = preferences.getInt("filter",0);
//Log.i("single",Integer.toString(choiceSingle));
//Log.i("filter",Integer.toString(choiceFilter));
//Log.i("previous",Integer.toString(previous));
Intent intent = getIntent();
pos = intent.getIntExtra("selected",0);
Log.i("item from grid",Integer.toString(pos));
viewPager = (ViewPager)findViewById(R.id.buyPageView);
viewPager.setCurrentItem(pos);
//getSupportFragmentManager().get
swipeAdapter = new BuySwipeAdapter(getSupportFragmentManager(),buyList);
viewPager.setAdapter(swipeAdapter);
viewPager.setOffscreenPageLimit(1);
if(choiceSingle>0){
ParseQuery<ParseObject> query =new ParseQuery<ParseObject>("SellBook");
query.whereEqualTo("book_category",categoryName[choiceSingle-1]);
query.findInBackground(new FindCallback<ParseObject>() {
@Override
public void done(List<ParseObject> objects, ParseException e) {
if(e==null){
for(ParseObject object : objects){
ParseFile file = object.getParseFile("book_image");
String user_id = object.getString("user_id");
String price = object.getString("book_price");
String condition = object.getString("book_condition");
BuyHorizontalPageModel buyModel = new BuyHorizontalPageModel(file,price,condition,user_id);
buyList.add(buyModel);
swipeAdapter.notifyDataSetChanged();
}
}
}
});
}if(choiceSingle == 0 && choiceFilter >0){
choices.clear();
ArrayList<ParseQuery<ParseObject>> queries = new ArrayList<ParseQuery<ParseObject>>();
UserFilterChoice filterChoice = new UserFilterChoice();
choices = filterChoice.choices(choiceFilter);
for(int i = 0; i < choices.size(); i++){
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("SellBook");
query.whereEqualTo("book_category",categoryName[choices.get(i)-1]);
queries.add(query);
}
ParseQuery<ParseObject> query = ParseQuery.or(queries);
query.findInBackground(new FindCallback<ParseObject>() {
@Override
public void done(List<ParseObject> objects, ParseException e) {
if(e==null){
for( ParseObject object:objects){
ParseFile file = object.getParseFile("book_image");
String user_id = object.getString("user_id");
String price = object.getString("book_price");
String condition = object.getString("book_condition");
BuyHorizontalPageModel buyModel = new BuyHorizontalPageModel(file,price,condition,user_id);
buyList.add(buyModel);
swipeAdapter.notifyDataSetChanged();
}
}
}
});
}
}
}
Adapter:
public class BuySwipeAdapter extends FragmentStatePagerAdapter {
private ArrayList<BuyHorizontalPageModel> buySet;
FragmentManager fm;
//SparseArray<Fragment> registeredFragment = new SparseArray<>();
public BuySwipeAdapter(FragmentManager fm,ArrayList<BuyHorizontalPageModel> buySet) {
super(fm);
this.buySet = buySet;
this.fm = fm;
}
@Override
public Fragment getItem(int position) {
BuyHorizontalPageModel pageSet = buySet.get(position);
Fragment pageFragment = new FragmentPage();
final Bundle bundle = new Bundle();
bundle.putString("price",pageSet.getPrice());
bundle.putString("condition",pageSet.getCondition());
bundle.putString("user_id",pageSet.getUser_id());
ParseFile file = pageSet.getFile();
try {
byte[] imageData = file.getData();
bundle.putByteArray("book_image",imageData);
} catch (ParseException e) {
e.printStackTrace();
}
pageFragment.setArguments(bundle);
return pageFragment;
}
@Override
public int getCount() {
return buySet.size();
}
Fagment:
public class FragmentPage extends Fragment {
ImageView book_image;
CircleImageView profile_user;
TextView price,condition;
String user;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.buy_items,container,false);
book_image = (ImageView)view.findViewById(R.id.book_image);
profile_user = (CircleImageView)view.findViewById(R.id.profile_image);
price = (TextView)view.findViewById(R.id.price);
condition = (TextView)view.findViewById(R.id.condition);
// retrieve Bundle
Bundle bundle = getArguments();
String priceBook = bundle.getString("price");
String conditionBook = bundle.getString("condition");
String user_id = bundle.getString("user_id");
byte[] data = bundle.getByteArray("book_image");
Bitmap bitmap = BitmapFactory.decodeByteArray(data,0,data.length);
book_image.setImageBitmap(bitmap);
ParseQuery<ParseObject> query = ParseQuery.getQuery("FbUser");
query.whereEqualTo("user_id",user_id);
query.findInBackground(new FindCallback<ParseObject>() {
@Override
public void done(List<ParseObject> objects, ParseException e) {
if(e==null){
for (ParseObject object : objects){
ParseFile file = object.getParseFile("user_image");
file.getDataInBackground(new GetDataCallback() {
@Override
public void done(byte[] data, ParseException e) {
Bitmap bitmap = BitmapFactory.decodeByteArray(data,0,data.length);
profile_user.setImageBitmap(bitmap);
}
});
}
}
}
});
//byte[] data = bundle.getByteArray("book_image");
//Bitmap bitmap = BitmapFactory.decodeByteArray(data,0,data.length);
//book_image.setImageBitmap(bitmap);
price.setText("₹" + priceBook);
price.setTextSize(20);
condition.setText(conditionBook);
condition.setTextSize(15);
return view;
}
}
position– Ionut J. Bejan