안드로이드 스튜디오 List View

ScrollView : 적은 양이고 고정적인 데이터일 때 사용 

AdapterView : 같은 형태의 데이터가 반복되고 양이 많을 때(번호) ,화면 크기보다 더 큰 자료를 표현하는 방법의 하나

(AdapterView는 동일한 형태의 많은 양의 데이터를 표현하는 데 최적화된 추상 클래스)

 

 

ArraryList<E> :가변 크기를 구현한 클래스

 

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity">

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

1번 방법

package com.example.listview;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    ListView listView;

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

        listView = findViewById(R.id.listview);

        ArrayList<String> data = new ArrayList<>();
        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1,data);
        listView.setAdapter(adapter);

        data.add("사과");
        data.add("딸기");
        data.add("바나나");
        data.add("포도");
        data.add("귤");
        data.add("오렌지");
        data.add("망고");
        adapter.notifyDataSetChanged();
    }
}

2번 방법

package com.example.listview;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    ListView listView;

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

        listView = findViewById(R.id.listview);

        String[] f = {"사과","딸기","바나나","포도","리치"};

        ArrayList<String> data = new ArrayList<>();
        for (int i=0 ; i<f.length; i++){
            data.add(f[i]);
        }
        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_checked,data);
        listView.setAdapter(adapter);
        adapter.notifyDataSetChanged();
    }
}

3번 방법

package com.example.listview;

        import androidx.appcompat.app.AppCompatActivity;

        import android.os.Bundle;
        import android.widget.ArrayAdapter;
        import android.widget.ListView;

        import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    ListView listView;

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

        listView = findViewById(R.id.listview);
        String[] f = {"사과","딸기","바나나","포도","리치","배"};

        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_checked,f);
        listView.setAdapter(adapter);
        adapter.notifyDataSetChanged();
    }
}

ListArray를 상속 받음

 

package com.example.listview;

        import androidx.appcompat.app.AppCompatActivity;

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

        import java.util.ArrayList;

public class MainActivity extends ListActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
// setContentView(R.layout.activity_main);
        String[] fruits = {"사과","딸기","바나나","포도","멜론","키위","오렌지"};
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, fruits);
        setListAdapter(adapter);
    }
}