Android RecyclerView 不出现在 EditText 下面

Question

我有一个布局，它有一个 EditText，当用户输入时应该在它下面显示建议。我以编程方式创建了一个 RecyclerView，它应该在 EditText 下面显示建议项目。但是当用户输入时它不显示 RecyclerView在编辑文本中。它应该看起来像下面的屏幕截图:

Java 代码:MainActivity.java:

editText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
          if(charSequence.toString().equals("Taxi")){
         RelativeLayout.LayoutParams layoutParams1=new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
              layoutParams1.setMargins(20,0,20,0);
              RecyclerView recyclerView=new RecyclerView(getContext());
              recyclerView.setAdapter(new CustomListAdapter());
              layoutParams1.addRule(RelativeLayout.BELOW,R.id.srch_qry);
              recyclerView.setLayoutParams(layoutParams1);

          }
        }

        @Override
        public void afterTextChanged(Editable editable) {

        }
    });

CustomListAdapter.java:

 public class CustomListAdapter extends RecyclerView.Adapter<CustomListAdapter.Holder> {
        public String[] taxi_list={"Audi","Tavera","Chevrolet"};
        @Override
        public Holder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view=LayoutInflater.from(parent.getContext()).inflate(R.layout.cstm_lst_lyt,parent,false);
            return new Holder(view);
        }

        @Override
        public void onBindViewHolder(Holder holder, int position) {
        holder.taxi_text.setText(taxi_list[position]);
        }

        @Override
        public int getItemCount() {
            return taxi_list.length;
        }

        public class Holder extends RecyclerView.ViewHolder{
             TextView taxi_text;
            public Holder(View itemView) {

                super(itemView);
                taxi_text=(TextView) itemView.findViewById(R.id.taxi_txt);
            }

        }
    }

cstm_lst_lyt.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#10000000"
    android:id="@+id/lyt">
<TextView
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:id="@+id/taxi_txt"
    android:textSize="20sp"
    android:text="Audi"
    android:paddingLeft="10dp"
    android:gravity="center|start"/>
</RelativeLayout>

Answer 1

首先，您必须为您的recyclerView 设置布局管理器。检查这个:

recyclerView.setLayoutManager(new LinearLayoutManager(getContext()))

然后将 RecyclerView 添加到您的 RelativeLayout

RelativeLayout myRelative = (RelativeLayout )findViewById(R.id.lyt);
myRelative.addView(recyclerView);