RecyclerView没有添加EditText直到它第二次点击？ （notifyDataSetChanged？）

Question

目标：使用RecyclerView将EditText字段添加到活动

发生了什么：我希望只要＆＃34;添加＆＃34;就可以将带有ImageView和EditText的LinearLayouts（水平）添加到屏幕上。单击按钮。他们直到我才出现：

-1）输入edittext字段并单击“完成”

-2）点击添加

-3）单击我已输入的EditText字段，然后再次单击“完成”，或单击“关闭”

它应该在第2步之后添加，而不是第3步。我的想法是它与notifyDataSetChanged有关，但我不确定是什么？

研究完成：花了最近几天浏览文档，教程，YouTube视频和stackoverflow搜索

测试完成：尝试移动调用notifyDataSetChanged（）的方法的移动位置; 试图改变布局的尺寸 尝试更改inputType

MyAdapter.java：

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.LinearLayout;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>{
    private ArrayList<LinearLayout> mDataSet;
    private Context mContext;
    private Random mRandom = new Random();


    public MyAdapter(Context context){

        mContext = context;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder{
        public EditText mTextEditName, mTextEditLocation;
        public LinearLayout mRelativeLayout; //from the (Main)Activity XML
        public ViewHolder(View v){
            super(v);
            mTextEditName = (EditText) v.findViewById(R.id.nameOfBusinessET);

            mRelativeLayout = (LinearLayout) v.findViewById(R.id.rl);
        }
    }

    void updateDataSet(ArrayList<LinearLayout> myArrayList) {
        mDataSet = myArrayList;
        notifyDataSetChanged();
    }

    @Override
    public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType){
        // Create a new View
        View v = LayoutInflater.from(mContext).inflate(R.layout.row_layout,parent,false);
        ViewHolder vh = new ViewHolder(v);
        return vh;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {

        holder.mTextEditName.setText("");

    }       

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

}

RegisterBusinessActivity.java：

public class RegisterBusinessActivity extends Activity {

    EditText businessLocationET;

    //FIREBASE ITEMS
    private static FirebaseUser currentUser;
    private static final String TAG = "RealtimeDB";
    private FirebaseDatabase database;
    private DatabaseReference dbRef;
    private EditText businessName;

    //RECYCLERVIEW ITEMS
    private Context mContext;
    LinearLayout mLinearLayout;
    private RecyclerView mRecyclerView;
    private MyAdapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;
    int position;
    ArrayList<LinearLayout> linearLayoutList = new ArrayList<LinearLayout>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register_businessprofile);

        Button addLocationBtn = (Button) findViewById(R.id.addLocationBtn);
        businessLocationET = (EditText) findViewById(R.id.businessLocationET);


        // Get the widgets reference from XML layout
        mLinearLayout = (LinearLayout) findViewById(R.id.rl);
        mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);

        mContext = getApplicationContext(); // Get the application context
        linearLayoutList.add(mLinearLayout);

        // Define a layout for RecyclerView
        mLayoutManager = new LinearLayoutManager(mContext, LinearLayoutManager.VERTICAL, false);
        mRecyclerView.setLayoutManager(mLayoutManager);
        // Initialize a new instance of RecyclerView Adapter instance
        mAdapter = new MyAdapter(mContext);

        // Set the adapter for RecyclerView
        mRecyclerView.setAdapter(mAdapter);
        mAdapter.updateDataSet(linearLayoutList);


        //FIREBASE FIELDS
        businessName = (EditText) findViewById(R.id.nameOfBusinessET);
        database = FirebaseDatabase.getInstance();
        dbRef = database.getReference("/data");
        currentUser =
                FirebaseAuth.getInstance().getCurrentUser();            



        //ADD EXTRA LOCATIONS
        addLocationBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                linearLayoutList.add(mLinearLayout);
            }
        });


    DatabaseReference.CompletionListener completionListener =
            new DatabaseReference.CompletionListener() {
                @Override
                public void onComplete(DatabaseError databaseError,
                                       DatabaseReference databaseReference) {

                    if (databaseError != null) {
                        notifyUser(databaseError.getMessage());
                    }
                }
            };


    private void notifyUser(String message) {
        Toast.makeText(RegisterBusinessActivity.this, message,
                Toast.LENGTH_SHORT).show();
    }


}

Answer 1

在添加＆＃39;之后，您似乎没有更新您的回收商。点击事件。您只需将项目添加到列表中，而无需更新适配器/ recyclerview。

一种选择就是使用您添加的特定位置：

mAdapter.notifyItemInserted(yourItems.size() - 1);

或优于使用：

mAdapter.notifyDataSetChanged();

所以它看起来像那样：

addLocationBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                linearLayoutList.add(mLinearLayout);
                mAdapter.updateDataSet(linearLayoutList);
            }
 });