[Android Studio] 커스텀 어댑터

커스텀 어댑터

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView android:id="@+id/lt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:textSize="20sp"/>
    <TextView android:id="@+id/lt2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:textSize="20sp"/>
</LinearLayout>

 

MyAdapter.java

• BaseAdapter: 커스텀 어댑터를 만들 때 상속받아 사용하는 추상 클래스
• LayoutInflater.from(context): context를 통해 LayoutInflater 객체 반환
• getView(){}: 커스텀 어댑터를 사용할 때 각 리스트 아이템의 뷰(View)를 생성하고 반환하는 역할
• if(view==null) convertView=inflater.inflate(): view가 null인 경우, 레이아웃 xml 파일을 뷰 객체로 변환

package com.example.test;

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

public class MyAdapter extends BaseAdapter {
    String[] data1, data2;
    LayoutInflater f;

    public MyAdapter(Context context, String[] data1, String[] data2) {
        f = LayoutInflater.from(context);
        this.data1 = data1;
        this.data2 = data2;
    }

    @Override
    public int getCount() {
        return data1.length;
    }

    @Override
    public Object getItem(int i) {
        return data1[i]+", "+data2[i];
    }

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

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        if(view == null) view = f.inflate(R.layout.list_item, viewGroup, false);

        TextView t1 = view.findViewById(R.id.lt);
        t1.setText(data1[i]);

        TextView t2 = view.findViewById(R.id.lt2);
        t2.setText(data2[i]);

        return view;
    }
}

 

MainActivity.java

• Myadapter a = new Myadapter(): Myadapter 클래스 객체 선언

package com.example.test;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    String data1[] = {"한국", "스페인", "중국", "일본", "캐나다", "독일", "프랑스"};
    String data2[] = {"Korea", "Spain", "China", "Japan", "Canada", "Germany", "France"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ListView l = new ListView(this);
        MyAdapter a = new MyAdapter(this, data1, data2);
        l.setAdapter(a);
        l.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int i, long id) {
                String v = (String) parent.getItemAtPosition(i);
                Toast.makeText(getApplicationContext(), v+" 클릭", Toast.LENGTH_SHORT).show();
            }
        });
        setContentView(l);
    }
}

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