在用户输入的列表视图中动态显示项目

Question

我有两个编辑文本，用户在其中输入他们的名字和姓氏。我想在列表视图中显示下面的名字和姓氏。因此，如果用户第一次输入姓名和姓氏，它应该显示在列表视图的第 1 行，而对于第二次输入，它应该显示在列表视图的第 2 行。我的问题是，当我输入新条目时，它会替换列表视图第一行中的文本，而不会显示在列表视图的第二行或下一行中。

请看我的代码。如果你能帮助我就太好了。

下面是我的Java代码

    '''    package com.nitin.inflaterproject;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    ListView list;
    EditText editText1, editText2;
    LinearLayout linearLayoutMain;
    MyAdapter adapter;
    int counter;

    public void addData(View view){

        String text1 = editText1.getText().toString();
        String text2 = editText2.getText().toString();
        if(text1.equals("") || text2.equals("")){

            Toast.makeText(this, "Please enter required field", Toast.LENGTH_SHORT).show();
        }else{

            counter++;
            Toast.makeText(this, "Counter value is " + counter, Toast.LENGTH_SHORT).show();

                adapter = new MyAdapter(this, text1, text2,counter);
                list.setAdapter(adapter);
        }


    }


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

        linearLayoutMain = (LinearLayout)findViewById(R.id.linearLayoutMain);
        editText1 = (EditText)findViewById(R.id.editText1);
        editText2 = (EditText)findViewById(R.id.editText2);
        list = (ListView)findViewById(R.id.listViewMain);
        counter = 0;



    }
}'''

And then Base Adapter Code

'''package com.nitin.inflaterproject;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;

class MyList{

    String text1;
    String text2;

    MyList(String text1, String text2){

        this.text1 = text1;
        this.text2 = text2;

    }


}

class MyAdapter extends BaseAdapter {

    ArrayList<MyList> list;
    private Context context;
    private int count;

    MyAdapter(Context c, String text1, String text2, int counter){
        count = counter - 1;
        context = c;
        list = new ArrayList<MyList>();
        String[] textstring1 = new String[counter];
        String[] textstring2 = new String[counter];
        textstring1[count] = text1;
        textstring2[count] = text2;
        list.add(new MyList(textstring1[count], textstring2[count]));

        }



    @Override
    public int getCount() {

     return list.size();

    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View row = convertView;

        if(row==null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            row = inflater.inflate(R.layout.myadapter, parent, false);
        }
        TextView text1 = (TextView)row.findViewById(R.id.textView1);
        TextView text2 = (TextView)row.findViewById(R.id.textView2);

            MyList temp = list.get(position);
                text1.setText(temp.text1);
                text2.setText(temp.text2);


        return row;
    }
}'''

my XML Code
Main Activity
'''<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="48dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:hint="@string/enter_name"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPersonName"
        android:hint="@string/enter_surname"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText1" />

    <Button
        android:id="@+id/buttonAdd"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="68dp"
        android:onClick="addData"
        android:padding="10dp"
        android:text="@string/add"
        android:textSize="20sp"
        app:layout_constraintStart_toEndOf="@+id/editText1"
        app:layout_constraintTop_toTopOf="parent" />

    <LinearLayout
        android:id="@+id/linearLayoutMain"
        android:layout_width="311dp"
        android:layout_height="468dp"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:background="#77BBCC00"
        android:orientation="horizontal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText2">

        <ListView
            android:id="@+id/listViewMain"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>
'''
XML code for Layout that needs to be inflated
'''<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="16dp"
    android:id="@+id/linearLayout">

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textSize="24sp"
        android:background="#99BBCC00"/>

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textSize="24sp"
        android:background="#BBCC00"/>
</LinearLayout>'''

Answer 1

I solved it by changing the code:

'''package com.nitin.inflaterproject;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    ListView list;
    EditText editText1, editText2;
    LinearLayout linearLayoutMain;
    MyAdapter adapter;
    int counter;
    int count = 0;
    ArrayList<MyList> list1;

    public void addData(View view){

        String text1 = editText1.getText().toString();
        String text2 = editText2.getText().toString();
        if(text1.equals("") || text2.equals("")){

            Toast.makeText(this, "Please enter required field", Toast.LENGTH_SHORT).show();
        }else{

            //counter++;
            //Toast.makeText(this, "Counter value is " + counter, Toast.LENGTH_SHORT).show();

              //  adapter = new MyAdapter(this, text1, text2,counter);
                //list.setAdapter(adapter);
            counter++;
            count = counter - 1;

            String[] textstring1 = new String[counter];
            String[] textstring2 = new String[counter];
            textstring1[count] = text1;
            textstring2[count] = text2;
            list1.add(new MyList(textstring1[count], textstring2[count]));
            adapter = new MyAdapter(this, list1);
            list.setAdapter(adapter);

        }


    }


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

        list1 = new ArrayList<MyList>();
        linearLayoutMain = (LinearLayout)findViewById(R.id.linearLayoutMain);
        editText1 = (EditText)findViewById(R.id.editText1);
        editText2 = (EditText)findViewById(R.id.editText2);
        list = (ListView)findViewById(R.id.listViewMain);
        counter = 0;



    }
}

class MyList{

    String text1;
    String text2;

    MyList(String text1, String text2){

        this.text1 = text1;
        this.text2 = text2;

    }


}'''

'''package com.nitin.inflaterproject;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;


class MyAdapter extends BaseAdapter {

    ArrayList<MyList> list;
    private Context context;

    MyAdapter(Context c, ArrayList<MyList> list1){

        context = c;
        list = new ArrayList<MyList>(list1);

        }



    @Override
    public int getCount() {

     return list.size();

    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View row = convertView;

        if(row==null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            row = inflater.inflate(R.layout.myadapter, parent, false);
        }
        TextView text1 = (TextView)row.findViewById(R.id.textView1);
        TextView text2 = (TextView)row.findViewById(R.id.textView2);

            MyList temp = list.get(position);
                text1.setText(temp.text1);
                text2.setText(temp.text2);


        return row;
    }
}'''

在用户输入的列表视图中动态显示项目

Dynamically displaying items in List View that is entered by User

android

listview

layout-inflater

baseadapter