[Android Studio] 간단 전화번호부 만들기

안드로이드 스튜디오로 전화번호부 만들기

 

코드

activity_main.xml

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

    <EditText
        android:id="@+id/name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="이름" />

    <EditText
        android:id="@+id/num"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="전화번호"
        android:inputType="number" />

    <Button
        android:id="@+id/btnAdd"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="삽입"
        android:textSize="15dp" />

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

 

item.xml

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

    <TextView
        android:id="@+id/nameItem"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#0000ff"
        android:textSize="20dp" />

    <TextView
        android:id="@+id/numItem"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/nameItem"
        android:layout_alignLeft="@+id/nameItem"
        android:textSize="15dp" />
</RelativeLayout>

 

MainActivity.java

package com.cookandroid.test2;

import java.util.ArrayList;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private ArrayList<String> nameList = new ArrayList<>();
    private ArrayList<String> numList = new ArrayList<>();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("간단 전화번호부");

        ListView list = findViewById(R.id.listView);

        CustomAdapter adapter = new CustomAdapter(this);
        list.setAdapter(adapter);

        final EditText name = findViewById(R.id.name);
        final EditText num = findViewById(R.id.num);

        Button btnAdd = findViewById(R.id.btnAdd);
        btnAdd.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                nameList.add(name.getText().toString());
                numList.add(num.getText().toString());
                adapter.notifyDataSetChanged();
            }
        });

        list.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                nameList.remove(position);
                numList.remove(position);
                adapter.notifyDataSetChanged();
                return false;
            }
        });

setOnItemLongClickListener를 넣어서 꾹 누르면 지워지게 만듦

    }
    private class CustomAdapter extends BaseAdapter {
        Context context;

        public CustomAdapter(Context context) {
            this.context = context;
        }

        @Override
        public int getCount() {
            return nameList.size();
        }

        @Override
        public Object getItem(int i) {
            return null;
        }

        @Override
        public long getItemId(int i) {
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View itemView = View.inflate(context, R.layout.item, null);
            TextView nameItem = itemView.findViewById(R.id.nameItem);
            TextView numItem = itemView.findViewById(R.id.numItem);

            nameItem.setText(nameList.get(position));
            numItem.setText(numList.get(position));
            return itemView;
        }
    }
}

커스텀 어댑터 사용

 

결과