Android RecyclerView 不会出现在 EditText 下方

Question

我有一个布局，它有一个 EditText，当用户输入时，它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 下方显示建议项。但是当用户在 EditText 中输入时它不显示 RecyclerView . 它应该看起来像下面包含的屏幕截图：

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) {

        }
    });

自定义列表适配器.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);

Answer 2

在您的onTextChanged()方法中，您创建RecyclerView但不通过addView()将其附加到布局。 您应该考虑将RecyclerView直接添加到 XML 布局中，而不是以编程方式添加。 然后在方法onTextChanged()更改其可见性并通知其适配器。

---

编辑

下面是一个布局示例。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

    <EditText
        android:id="@+id/edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/edit_text"/>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/text_suggestions"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/edit_text"/>

Answer 3

我不知道你为什么要浪费时间创建自己的适配器并且不需要所有这些 Just Use

AutoCompleteTextView android 视图

 String[] fruits = {"Apple", "Banana", "Cherry", "Date", "Grape", "Kiwi", "Mango", "Pear"};
    //Creating the instance of ArrayAdapter containing list of fruit names
            ArrayAdapter<String> adapter = new ArrayAdapter<String>
                    (this, android.R.layout.select_dialog_item, fruits);
            //Getting the instance of AutoCompleteTextView
            AutoCompleteTextView actv = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView);
            actv.setThreshold(1);//will start working from first character
            actv.setAdapter(adapter);//setting the adapter data into the AutoCompleteTextView
            actv.setTextColor(Color.RED);

如何使用它 - http://www.journaldev.com/9574/android-autocompletetextview-example-tutorial

Android 代码 - https://developer.android.com/reference/android/widget/AutoCompleteTextView.html最佳示例 - https://www.tutorialspoint.com/android/android_autocompletetextview_control.htm

聪明点哥