ListView to RecyclerView conversion, problem in converting get View method

ListView to RecyclerView conversion, problem in converting get View method - android

I want to convert Listview to RecyclerView in my app, I tried to convert code but stucked at getView method, can any one explain how to use this getView code in Recylcer view.
Adapter for ListView CardAdapter.java
public class CardAdapter extends ArrayAdapter<CardDataModel> {
private Context context;
List<CardDataModel> cards;
SharedPreference sharedPreference;
public CardAdapter(Context context, List<CardDataModel> cards) {
super(context, R.layout.card_list_item, cards);
this.context = context;
this.cards = cards;
sharedPreference = new SharedPreference();
}
private class ViewHolder {
TextView CardNameTxt;
TextView CardDescTxt;
TextView CardPriceTxt;
ImageView favoriteImg;
}
#Override
public int getCount() {
return cards.size();
}
#Override
public CardDataModel getItem(int position) {
return cards.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.card_list_item, null);
holder = new ViewHolder();
holder.CardNameTxt = (TextView) convertView
.findViewById(R.id.txt_crd_name);
holder.CardDescTxt = (TextView) convertView
.findViewById(R.id.txt_crd_desc);
holder.CardPriceTxt = (TextView) convertView
.findViewById(R.id.txt_crd_no);
holder.favoriteImg = (ImageView) convertView
.findViewById(R.id.imgbtn_favorite);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
CardDataModel card = (CardDataModel) getItem(position);
holder.CardNameTxt.setText(card.getName());
holder.CardDescTxt.setText(card.getDescription());
holder.CardPriceTxt.setText(card.getPrice() + " ");
/*If a product exists in shared preferences then set heart_red drawable
* and set a tag*/
if (checkFavoriteItem(card)) {
holder.favoriteImg.setImageResource(R.drawable.heart_red);
holder.favoriteImg.setTag("red");
} else {
holder.favoriteImg.setImageResource(R.drawable.heart_grey);
holder.favoriteImg.setTag("grey");
}
return convertView;
}
public boolean checkFavoriteItem(CardDataModel checkCard) {
boolean check = false;
List<CardDataModel> favorites = sharedPreference.getFavorites(context);
if (favorites != null) {
for (CardDataModel card : favorites) {
if (card.equals(checkCard)) {
check = true;
break;
}
}
}
return check;
}
#Override
public void add(CardDataModel card) {
super.add(card);
cards.add(card);
notifyDataSetChanged();
}
#Override
public void remove(CardDataModel card) {
super.remove(card);
cards.remove(card);
notifyDataSetChanged();
}
}
converted somecode like this in RecyclerView Adapter ... CardRvAdapter.java
public class CardRvAdapter extends RecyclerView.Adapter<CardRvAdapter.MyViewHolder> {
private Context context;
List<CardDataModel> cards;
SharedPreference sharedPreference;
public CardRvAdapter(Context context, List<CardDataModel> cards) {
this.context = context;
this.cards = cards;
sharedPreference = new SharedPreference(); }
#Override
public int getItemCount() {
return cards.size();
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
// on create view holder code
View view;
LayoutInflater mInflater = LayoutInflater.from(context);
view = mInflater.inflate(R.layout.card_list_item, viewGroup,false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder myViewHolder, int i) {
//on bind view holder code
myViewHolder.CardPriceTxt.setText(cards.get(i).getPrice());
myViewHolder.CardNameTxt.setText(cards.get(i).getName());
myViewHolder.CardDescTxt.setText(cards.get(i).getDescription());
if (checkFavoriteItem(card)) {
myViewHolder.favoriteImg.setImageResource(R.drawable.heart_red);
myViewHolder.favoriteImg.setTag("red");
} else {
myViewHolder.favoriteImg.setImageResource(R.drawable.heart_grey);
myViewHolder.favoriteImg.setTag("grey");
} }
// checking for favotites in shared preferences
public boolean checkFavoriteItem(CardDataModel checkCard) {
boolean check = false;
List<CardDataModel> favorites = sharedPreference.getFavorites(context);
if (favorites != null) {
for (CardDataModel card : favorites) {
if (card.equals(checkCard)) {
check = true;
break;
}
}
}
return check;
}
#Override
public void add(CardDataModel card) {
super.add(card);
cards.add(card);
notifyDataSetChanged();
}
#Override
public void remove(CardDataModel card) {
super.remove(card);
cards.remove(card);
notifyDataSetChanged();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView CardNameTxt;
TextView CardDescTxt;
TextView CardPriceTxt;
ImageView favoriteImg;
public MyViewHolder(#NonNull View itemView) {
super(itemView);
this.CardDescTxt = (TextView) itemView.findViewById(R.id.txt_crd_desc);
this.CardNameTxt = (TextView) itemView.findViewById(R.id.txt_crd_name);
this.CardPriceTxt = (TextView) itemView.findViewById(R.id.txt_crd_no);
this.favoriteImg = (ImageView) itemView.findViewById(R.id.imgbtn_favorite);
}}}
The problem part..
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.card_list_item, null);
holder = new ViewHolder();
holder.CardNameTxt = (TextView) convertView
.findViewById(R.id.txt_crd_name);
holder.CardDescTxt = (TextView) convertView
.findViewById(R.id.txt_crd_desc);
holder.CardPriceTxt = (TextView) convertView
.findViewById(R.id.txt_crd_no);
holder.favoriteImg = (ImageView) convertView
.findViewById(R.id.imgbtn_favorite);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
CardDataModel card = (CardDataModel) getItem(position);
holder.CardNameTxt.setText(card.getName());
holder.CardDescTxt.setText(card.getDescription());
holder.CardPriceTxt.setText(card.getPrice() + " ");
/*If a product exists in shared preferences then set heart_red drawable
* and set a tag*/
if (checkFavoriteItem(card)) {
holder.favoriteImg.setImageResource(R.drawable.heart_red);
holder.favoriteImg.setTag("red");
} else {
holder.favoriteImg.setImageResource(R.drawable.heart_grey);
holder.favoriteImg.setTag("grey");
}
return convertView;
}
How to modify this code and where to add this checkFavItem, add , and remove methods..suggest me , i am new to android development.

Finishing RecyclerView Code
// specify the row layout file and click for each row
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(listItemLayout, parent, false);
ViewHolder myViewHolder = new ViewHolder(view);
return myViewHolder;
}
// load data in each row element
#Override
public void onBindViewHolder(final ViewHolder holder, final int listPosition) {
TextView item = holder.item;
item.setText(itemList.get(listPosition).getName());
}

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public View getView(int position, View convertView, ViewGroup parent) {
ViewTag viewTag;
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complete code
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private Context context;
public static ArrayList<Model> modelArrayList;
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#Override
public long getItemId(int position) {
return 0;
}
#Override
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final ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
LayoutInflater inflater = (LayoutInflater) context
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convertView = inflater.inflate(R.layout.list_item_select, null, true);
holder.checkBox = convertView.findViewById(R.id.checkBox);
holder.tvName = convertView.findViewById(R.id.textView7);
holder.Tvnumber = convertView.findViewById(R.id.textView8);
convertView.setTag(holder);
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// the getTag returns the viewHolder object set as a tag to the view
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holder.tvName.setText(modelArrayList.get(position).getName());
holder.Tvnumber.setText(modelArrayList.get(position).getPhone());
holder.checkBox.setChecked(modelArrayList.get(position).getSelected());
holder.checkBox.setTag(R.integer.btnplusview, convertView);
holder.checkBox.setTag(position);
holder.checkBox.setOnClickListener(new View.OnClickListener() {
#Override
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View tempview = (View) holder.checkBox.getTag(R.integer.btnplusview);
TextView tv = tempview.findViewById(R.id.textView7);
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modelArrayList.get(pos).setSelected(false);
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How to set visibility true of one button onclick of another button in listView - android

I want to set the visibility to true of btnProductDetailMinus to true on click of btnProductDetailAddToCart. This is my code.
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private Context context;
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TextView productVariantName;
TextView productVariantMrp;
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But its giving error "Variable holder is accessed from within inner class. needs to declared final"
This is the line giving error.
holder.btnProductDetailMinus.setVisibility(View.VISIBLE);
How to fix this?

Assign holder tot a final variabele:
final ViewHolder fHolder = holder;
Then in onClick:
fHolder.btnProductDetailMinus.setVisibility(View.VISIBLE);

Move this line out of the if (convertView == null)
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You can declare final ViewHolder holder = null; instead of ViewHolder holder = null;
You can just make it a Global variable.
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One of the approach that I follow is create a Map or List in Adapter class and onClick set value and that collection, and in adapter getView method check for the collection value. .
Checkout the below code.
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private Context context;
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ViewHolder holder = null;
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int position = (int)v.getTag();
Utility.displayToast("wonderful");
visibilityMap.put(position, true);
notifyDataSetChanged();
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convertView.setTag(holder);
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holder.btnProductDetailAddToCart.setTag(position);
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}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
HotelCell cell = (HotelCell) convertView;
if (cell == null) {
cell = new HotelCell(mContext);
} else {
Log.d("TAG", "Reached here 2");
}
cell.setHotel(mHotels.get(position));
cell.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(mContext,
HotelDetailActivity.class);
intent.putExtra("DATA", ((HotelCell) v).getHotel());
startActivity(intent);
}
});
cell.setPadding(0, 0, 10, 0);
return cell;
}
}

Dear i suggest to try My this Code
public View getView(final int position, View convertView, ViewGroup parent)
{
View v = convertView;
ViewHolder holder;
if (v == null)
{
v = inflater.inflate(R.layout.custom_image_layout, null);
holder = new ViewHolder();
holder.txtFileName = (TextView) v.findViewById(R.id.txtFileName);
holder.imageView = (ImageView) v.findViewById(R.id.imgView);
v.setTag(holder);
} else
{
holder = (ViewHolder) v.getTag();
}
holder.imageView.setImageBitmap(bm);
holder.txtFileName.setText(""+nameoffile);
return v;
}
static class ViewHolder
{
public ImageView imageView;
public TextView txtFileName;
}
Use The Holder Class

Develop Reference

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