Get list of checked checkboxes using recyclerview android

Question

I filled out a recyclerView with an image, a caption and a checkbox. I have two problems.

• How to make a checkbox selected when you click an image element or the entire recycling element.

• I need to move on to the next step, getting all checked items from recyclerview.

My layout:

<RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="8dp"> <ImageView android:id="@+id/image" android:layout_width="match_parent" android:layout_height="150dp" android:layout_gravity="center_horizontal" android:contentDescription="Interests" android:scaleType="centerCrop" android:src="@drawable/ic_yash_dp" /> <TextView android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:layout_gravity="bottom" android:layout_margin="5dp" android:layout_marginTop="24dp" android:background="@drawable/rounded_corners" android:gravity="bottom" android:padding="5dp" android:text="GYM" android:textAlignment="center" android:textColor="@color/white" /> <CheckBox android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/checkBox" android:layout_margin="2dp" android:layout_alignParentTop="true" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" /> </RelativeLayout> 

My adapter:

 @Override public void onBindViewHolder(RecyclerViewHolder holder, int position) { final InterestBean model = arrayList.get(position); final int pos = position; RecyclerViewHolder mainHolder = (RecyclerViewHolder) holder;// holder Bitmap image = BitmapFactory.decodeResource(context.getResources(), model.getImage());// This will convert drawbale image into bitmap // setting title mainHolder.title.setText(model.getTitle()); mainHolder.imageview.setImageBitmap(image); mainHolder.checkBox.setChecked(arrayList.get(position).isSelected()); mainHolder.checkBox.setTag(arrayList.get(position)); mainHolder.checkBox.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { CheckBox cb = (CheckBox) v; InterestBean contact = (InterestBean) cb.getTag(); contact.setIsSelected(cb.isChecked()); arrayList.get(pos).setIsSelected(cb.isChecked()); selectedItems.add(pos); Toast.makeText( v.getContext(), pos + cb.isChecked(), Toast.LENGTH_LONG).show(); } });} 

Answer 1

One simple solution is to create an OnItemCheckLister and implement it as follows:

 public class MyAdapter extends RecyclerViewAdapter { interface OnItemCheckListener { void onItemCheck(Item item); void onItemUncheck(Item item); } ... @NonNull private OnItemCheckListener onItemCheckListener; public MyAdapter (List<Item> items, @NonNull OnItemCheckListener onItemCheckListener) { this.items = items; this.onItemClick = onItemCheckListener; } ... @Override public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) { if (holder instanceof MyViewHolder) { final Item currentItem = items.get(position); ... ((MyViewHolder) holder).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { ((MyViewHolder) holder).checkbox.setChecked( !((MyViewHolder) holder).checkbox.isChecked()); if (((MyViewHolder) holder).checkbox.isChecked()) { onItemClick.onItemCheck(currentItem); } else { onItemClick.onItemUncheck(currentItem); } } }); } } static class MyViewHolder extends RecyclerView.ViewHolder { CheckBox checkbox; View itemView; ... public MyViewHolder(View itemView) { super(itemView); this.itemView = itemView; checkbox = (CheckBox) itemView.findViewById(R.id.checkbox); checkbox.setClickable(false); ... } public void setOnClickListener(View.OnClickListener onClickListener) { itemView.setOnClickListener(onClickListener); } } } 

Then in the exercise we can do this:

  private List<Item> currentSelectedItems = new ArrayList<>(); ... myAdapter = new MyAdapter(items, new MyAdapter.OnItemCheckListener() { @Override public void onItemCheck(Item item) { currentSelectedItems.add(item); } @Override public void onItemUncheck(Item item) { currentSelectedItems.remove(item); } }); 

Then you can do things with currentSelectedItems .

Note. Since this solution assumes that the entire item should be clicked, so the checkbox should not be activated.

Answer 2

You can use the Model class to get items checked for recyclerView. More links: Android Recyclerview checkbox

Model

 public class Model { private boolean isSelected; private String animal; public String getAnimal() { return animal; } public void setAnimal(String animal) { this.animal = animal; } public boolean getSelected() { return isSelected; } public void setSelected(boolean selected) { isSelected = selected; } } 

Adapter

 import android.content.Context; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.CheckBox; import android.widget.TextView; import android.widget.Toast; import java.util.ArrayList; public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.MyViewHolder> { private LayoutInflater inflater; public static ArrayList<Model> imageModelArrayList; private Context ctx; public CustomAdapter(Context ctx, ArrayList<Model> imageModelArrayList) { inflater = LayoutInflater.from(ctx); this.imageModelArrayList = imageModelArrayList; this.ctx = ctx; } @Override public CustomAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = inflater.inflate(R.layout.rv_item, parent, false); MyViewHolder holder = new MyViewHolder(view); return holder; } @Override public void onBindViewHolder(final CustomAdapter.MyViewHolder holder, int position) { holder.checkBox.setText("Checkbox " + position); holder.checkBox.setChecked(imageModelArrayList.get(position).getSelected()); holder.tvAnimal.setText(imageModelArrayList.get(position).getAnimal()); // holder.checkBox.setTag(R.integer.btnplusview, convertView); holder.checkBox.setTag(position); holder.checkBox.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Integer pos = (Integer) holder.checkBox.getTag(); Toast.makeText(ctx, imageModelArrayList.get(pos).getAnimal() + " clicked!", Toast.LENGTH_SHORT).show(); if (imageModelArrayList.get(pos).getSelected()) { imageModelArrayList.get(pos).setSelected(false); } else { imageModelArrayList.get(pos).setSelected(true); } } }); } @Override public int getItemCount() { return imageModelArrayList.size(); } class MyViewHolder extends RecyclerView.ViewHolder { protected CheckBox checkBox; private TextView tvAnimal; public MyViewHolder(View itemView) { super(itemView); checkBox = (CheckBox) itemView.findViewById(R.id.cb); tvAnimal = (TextView) itemView.findViewById(R.id.animal); } } 

Answer 3

1) You can add mainHolder.imageview OnClickListener
2) Two steps:

• Add to category InterestBean boolen isChecked
  
• When you move on to the next step, get all InterestBeans, get all verified InterestBeans, and save them.

the code:

 mainHolder.imageview.setOnClickListener(new View.OnClickListener() { public void onClick (View v) { mainHolder.checkBox.setChecked(!mainHolder.checkBox.isChecked()); } } ); 

Answer 4

Just add two recyclerview override methods

 @Override public long getItemId(int position) { return position; } @Override public int getItemViewType(int position) { return position; } 

Answer 5

by @ninjahoahong I add a listener checkbox in the onBindViewHolder method and the checkbox can click an option.

 viewHolder.checkBox.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { int pos = viewHolder.getAdapterPosition(); ChoiceItem currentItem = mChoice.get(pos); if(viewHolder.checkBox.isChecked()){ onItemCheckListener.onItemCheck(currentItem); currentItem.setCheck(true); }else{ onItemCheckListener.onItemUncheck(currentItem); currentItem.setCheck(false); } } }); 

Answer 6

 recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getApplicationContext(), recyclerView, new RecyclerTouchListener.ClickListener() { @Override public void onClick(View view, int position) { List list= aList.get(position); //Toast.makeText(getApplicationContext(), movie.getTitle() + " is selected!", Toast.LENGTH_SHORT).show(); action(list.getId()); } @Override public void onLongClick(View view, int position) { } }));