Question

我有一个具有EditText的布局，当用户输入时应显示它下面的建议。我以编程方式创建了一个RecyclerView，它应该显示EditText下面的建议项。但是当用户输入时它不会显示RecyclerView在EditText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recyclerView设置布局管理器。检查一下：

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onTextChanged()方法中，您可以创建RecyclerView，但不会通过addView()将其附加到布局中。您应该考虑直接在XML布局中添加RecyclerView而不是以编程方式添加。然后在方法onTextChanged()中更改其可见性+通知其适配器。

修改

以下是布局示例。

<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adpter并且不需要所有这些只是使用

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

聪明兄弟

Android RecyclerView不会出现在EditText下面

3 个答案: