[英]How do I update recyclerView inside onBindViewHolder of its adapter?
I've made a list of cards inside recyclerView. 我在recyclerView里面制作了一张卡片列表。 When card is held for sometime, its corresponding entry in database is deleted so after that, the card must be removed.
当卡被保留一段时间后,其数据库中相应的条目将被删除,因此必须删除该卡。 It can be done by calling setting new updated adapter.
可以通过调用设置新的更新适配器来完成。 But I'm unable to use setAdapter function inside onBindViewHolder because I don't know how to get same recyclerView.
但是我无法在onBindViewHolder中使用setAdapter函数,因为我不知道如何获得相同的recyclerView。 Please help.
请帮忙。
CODE: 码:
public class RecyclerViewAdapterMain extends RecyclerView.Adapter<RecyclerViewAdapterMain.ViewHolder> {
String[] strings;
DBManager dbManager;
public RecyclerViewAdapterMain(String[] arrayList) {
this.strings = arrayList;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_list,parent,false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
holder.textView.setText(strings[position]);
holder.cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(holder.itemView.getContext(),SecondActivity.class);
Bundle bundle = new Bundle();
bundle.putString("list",strings[position]);
intent.putExtras(bundle);
holder.itemView.getContext().startActivity(intent);
//overridePendingTransition(R.anim.abc_fade_in,R.anim.abc_fade_out);
}
});
holder.cardView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(final View view) {
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which){
case DialogInterface.BUTTON_POSITIVE:
dbManager = new DBManager(holder.itemView.getContext(),null,null,1);
dbManager.deleteList(strings[position]);
String[] strings = dbManager.showLists();
RecyclerViewAdapterMain recyclerViewAdapter = new RecyclerViewAdapterMain(strings);
//I WANT TO SET UPDATED ADAPTER HERE
break;
case DialogInterface.BUTTON_NEGATIVE:
//No button clicked
break;
}
}
};
AlertDialog.Builder builder = new AlertDialog.Builder(holder.itemView.getContext());
builder.setMessage("Are you sure that you want to delete \""+strings[position]+"\"?").setPositiveButton("Yes", dialogClickListener)
.setNegativeButton("No", dialogClickListener).show();
return true;
}
});
}
@Override
public int getItemCount() {
return strings.length;
}
public class ViewHolder extends RecyclerView.ViewHolder{
CardView cardView;
TextView textView;
public ViewHolder(View itemView) {
super(itemView);
textView = (TextView) itemView.findViewById(R.id.textView);
cardView = (CardView) itemView.findViewById(R.id.cardView);
}
}
} }
Write in Adapter class in onBindViewHolder 在onBindViewHolder中的Adapter类中编写
photolist.remove(i);
notifyItemRemoved(i);
notifyItemRangeChanged(i, photolist.size());
notifyDataSetChanged();
You need to update your existing variable 您需要更新现有变量
String[] strings;
And then tell the RecyclerView to redraw the items. 然后告诉RecyclerView重绘项目。
notifyItemRemoved(position);
or 要么
notifyDataSetChanged();
You then get 然后你得到
case DialogInterface.BUTTON_POSITIVE:
dbManager = new DBManager(holder.itemView.getContext(),null,null,1);
dbManager.deleteList(strings[position]);
strings = dbManager.showLists();
notifyItemRemoved(position);
break;
试试这个
RecyclerViewAdapterMain.this.notifyItemRemoved(position);
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