Question

我有一个包含EditText的片段，当输入特定字符串时，编程创建的RecyclerView直接显示在EditText下面。单击该项时，将使用SharedPreference保存它。但是我无法访问片段中的项目。 Java代码：

HomePageFrag：

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) {
                Toast.makeText(getContext(),"textchanged",Toast.LENGTH_SHORT).show();
              if(charSequence.toString().equals("Taxi"))
              {
                  RelativeLayout.LayoutParams layoutParams1=new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
                  layoutParams1.setMargins(40,0,40,0);
                  recyclerView.setAdapter(new CustomListAdapter(getContext()));
                  layoutParams1.addRule(RelativeLayout.BELOW,R.id.srch_qry);
                  recyclerView.setLayoutParams(layoutParams1);
                  recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
                  relativeLayout.addView(recyclerView);
                  recyclerView.setOnClickListener(new View.OnClickListener() {
                      @Override
                      public void onClick(View view) {
                          sharedPreferences=getContext().getSharedPreferences("Clck", Context.MODE_PRIVATE);
                          if(sharedPreferences.contains("Clck")) {
                              clicked_itm=sharedPreferences.getString("itm", null);
                              Log.e("Item",clicked_itm);
                              if(clicked_itm!=null){
                                  relativeLayout.removeView(recyclerView);
                              }
                          }

                      }
                  });
                  Toast.makeText(getContext(),"Taxi",Toast.LENGTH_SHORT).show();

              }
                else {
                  relativeLayout.removeView(recyclerView);
              }
            }
            @Override
            public void afterTextChanged(Editable editable) {

            }
        });

CustomListAdapter：

public class CustomListAdapter extends RecyclerView.Adapter<CustomListAdapter.Holder> {
    public String[] taxi_list={"Audi","Tavera","Chevrolet"};
    public Context context;
    public CustomListAdapter(Context context){
        this.context=context;
    }
    @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);
            taxi_text.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Log.e("Clck","Yes");
                    SharedPreferences sharedPreferences=context.getSharedPreferences("Clck",Context.MODE_PRIVATE);
                    SharedPreferences.Editor editor=sharedPreferences.edit();
                    editor.putString("itm",taxi_text.getText().toString());
                    editor.commit();
                }
            });
        }

    }
}

XML：

cstm_lst_lyt：

<?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="#40000000"
    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

您需要在CustomAdapter类中实现一个侦听器，在这种情况下，HomeFrag类将是侦听器。例如：

1.在CustomAdapter中，您将创建一个将成为监听器的接口：

public interface RowClickListener{
    void onRowClick(String whateverTextYouNeedToPassToHomeFrag);
}

2.在Custom Adapter构造函数中，您将传递一个侦听器对象，并将它放在该类型的字段中：

public CustomAdapter(param,param...,RowClickListener listener){
   this.listener = listener;
}

在onClick的Holder类中，您将调用侦听器的onRowClick方法：

public void onClick(View view){
    String text;
    listener.onRowClick(text);
}

4.然后在创建适配器时，在HomeFrag类中，您可以在构造函数中传递匿名类：

new CustomAdapter(arg,arg...,new CustomAdapter.RowClickListener(){
    @Override
    public void onRowClick(String textYouNeed){
        //do something with text

}

4.b或者你可以做HomeFrag实现CustomAdapter.RowClickListener然后只做：

new CustomAdapter(arg,arg...,this);

Answer 2

由于我无法在Fragment中获取单击的数据，因此我在CustomListAdapter的构造函数中传递了EditText对象，并在Holder类的构造函数中设置了EditText的文本。 HomePageFrag.java：

 recyclerView.setAdapter(new CustomListAdapter(getContext(),editText));

CustomListAdapter.java：

public CustomListAdapter(Context context,EditText editText){
this.editText=editText;
}
 public Holder(View itemView) {
            super(itemView);
 taxi_text=(TextView) itemView.findViewById(R.id.taxi_txt);
            taxi_text.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
editText.setText(taxi_text.getText().toString());
}

Android无法获得recyclerview点击的项目

2 个答案: