按下退格键时实现搜索过滤器导致问题 [英] Implementing Search filter Causing problem when pressed backspace

问题描述

当我第一次键入 Edit text 时，我试图对recyclerview中的复杂对象数据实现搜索过滤器，但是它正常工作，但是每当我尝试通过按退格键删除字符时，为了修改我们的搜索，我在这方面屡屡失败.我只能搜索一次！

I am trying to implement a search filter on complex object data in recyclerview when I type in the Edit text first-time it works properly, but whenever I try to delete characters by pressing back-space in order to modify our search- I am repeatedly failing in this regard. I can only search once !!

        etSearch = (EditText) findViewById(R.id.edittext);

    etSearch.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
                myAdapter.filter(s);

        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });

现在的过滤器代码

    public void filter(CharSequence sequence) {
    ArrayList<user> temp = new ArrayList<>();
        if (!TextUtils.isEmpty(sequence)) {
            for (user s : arr) {
                Log.d("users ",s.getName());
                if (s.getName().toLowerCase().contains(sequence)) {
                    temp.add(s);
                }
            }

        } else {
            temp.addAll(arrcopy);
        }
        arr.clear();
        arr.addAll(temp);
        notifyDataSetChanged();
        temp.clear();

}

出了什么问题，我只能搜索一次，不胜感激

Whats the issue, I cannot search more than once-any help is appreciated

这是我的适配器类

    public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyHolder>
{
    Context cxt;
    ArrayList<user> arr;
    ArrayList<user> arrcopy;
    DatabaseReference dref;
    MyAdapter myAdapter;
    public MyAdapter(Context context, ArrayList<user> arrayList)
    {
        cxt = context;
        arr = arrayList;
        arrcopy=new ArrayList<>(arr);
        Log.d("Very start arr",arr.toString());
        notifyDataSetChanged();
        dref = FirebaseDatabase.getInstance().getReference("users");
    }


    @NonNull
    @Override
    public MyHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(cxt).inflate(R.layout.item_chatroom,viewGroup,false);
        myAdapter = new MyAdapter(cxt, arr);
        Log.d("Inside MyHolder arr",arr.toString());
        return new MyHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull final MyHolder myHolder,final int i) {

        final String name = arr.get(i).getUsername();
        String pic=arr.get(i).getPic();
        final String mail=arr.get(i).getEmail();
        myHolder.name.setText(name);



        Glide.with(myHolder.profile.getContext())
                .load(pic)
                .into(myHolder.profile);

        myHolder.name.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(cxt,MainActivity.class);
                intent.putExtra("Id",arr.get(i).getId());
                intent.putExtra("Name",arr.get(i).getUsername());
                cxt.startActivity(intent);
            }
        });

        myHolder.info.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final SweetAlertDialog pDialog = new SweetAlertDialog(cxt, SweetAlertDialog.SUCCESS_TYPE);
                pDialog.setTitleText("User Information e-mail ID");
                pDialog.setContentText("Name: "+name+"\n\n E-mail: "+mail);
                pDialog.setConfirmText("Ok");
                pDialog.show();
            }
        });
    }

    @Override
    public int getItemCount() {
        return arr.size();
    }

    class MyHolder extends RecyclerView.ViewHolder
    {
        TextView name;
        ImageView profile,info;
        public MyHolder(@NonNull View itemView) {
            super(itemView);
            name = itemView.findViewById(R.id.txv);
            profile=itemView.findViewById(R.id.profile);
            info=itemView.findViewById(R.id.profileinfo);
        }
    }

    public void filter(CharSequence sequence) {

        ArrayList<user> temp = new ArrayList<>();
            if (!TextUtils.isEmpty(sequence)) {
                for (user s : arr) {
                    if (s.getName().toLowerCase().contains(sequence)) {
                        temp.add(s);
                    }
                }

            } else {
                temp.addAll(arrcopy);

            }
            arr.clear();
            arr.addAll(temp);

            notifyDataSetChanged();
            temp.clear();

    }

}

推荐答案

我假设arrcopy是arr的副本，例如:

I assume the arrcopy is the copy of arr like:

ArrayList<User> arrcopy = new ArrayList<>(arr);

如果修改arr，它也会更改arrcopy的内容.当没有结果匹配时，arr为空，arrcopy也为空.

If you modify arr, it also change the content of arrcopy. And when no result matches, the arr is empty, so is the arrcopy.

else {
    temp.addAll(arrcopy);
}
arr.clear();
arr.addAll(temp);

现在温度为空，为适配器设置的arr数据为空，因此会发生问题.请尝试:
在MyAdapter中:

Now temp is empty, the arr data you set for adapter is empty, so issues happens. Please try:
In MyAdapter:

Context cxt;
ArrayList<user> arr;
public MyAdapter(Context context) {
    cxt = context;
    dref = FirebaseDatabase.getInstance().getReference("users");
}

public void setData(ArrayList<User> arrayList) {
    arr = arrayList;
    notifyDataSetChanged();
}

还要在您的活动/片段中添加filter():

Also put the filter() in your activity/fragment:

protected void onCreate(final Bundle savedInstanceState) {
    etSearch = (EditText) findViewById(R.id.edittext);
    etSearch.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            etSearch.requestFocus();
        }
    });
    etSearch.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
                filter(etSearch.getText().toString());
        }

        @Override
        public void afterTextChanged(Editable s) {
        }
    });
    etSearch.clearFocus();

    mAdapter = new MyAdapter(this);
    mAdapter.setData(arrayList);
    mRecyclerView.setAdapter(mAdapter);
    ...
}

public void filter(String input) {
    if (!TextUtils.isEmpty(input)) {
        ArrayList<User> temp = new ArrayList<>();
        for (user s : arr) {
            if (s.getName().toLowerCase().contains(input)) {
                temp.add(s);
            }
        }
        mAdapter.setData(temp);
    } else {
        mAdapter.setData(arr);
    }
    mAdapter.notifyDataSetChanged();
}

这篇关于按下退格键时实现搜索过滤器导致问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！