리스트뷰와 그리드뷰

리스트뷰

 

리스트뷰(ListView)는 데이터를 리스트 모양으로 보여주며 리스트 중 하나를 선택하는 용도로 사용한다.

 

activity_main.xml Code

 

<?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">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/listView1"/>

</LinearLayout>

 

MainActivity.java Code

 

public class MainActivity extends AppCompatActivity {
    ListView list;

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

        final String[] mid = {"고양이", "개", "라이언", "토끼", "비둘기", "구구구"};
        list = (ListView)findViewById(R.id.listView1);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_multiple_choice, mid);
        list.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        list.setAdapter(adapter);

        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Toast.makeText(getApplicationContext(), mid[i], Toast.LENGTH_SHORT).show();
            }
        });
    }
}

 

 

여기서 라디오 버튼으로 변경하려면 CHOICE_MODE_SINGLE 을 사용한다.

 

리스트뷰의 동적 추가와 삭제하는 코드 

이때 추가는 항목 추가를 누르면 추가되고 삭제는 해당 목록에 있는 임의의 것을 길게 누르면 삭제된다.

 

activity_main.xml Code

 

<?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:padding="10dp"
    android:orientation="vertical">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="입력하세요"
        android:id="@+id/edit1"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btn1"
        android:text="항목 추가"/>

    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/listView1"/>

</LinearLayout>

 

MainActivity.java Code

 

public class MainActivity extends AppCompatActivity {
    EditText edit;
    Button btn;
    ListView list;

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

        edit = (EditText)findViewById(R.id.edit1);
        btn = (Button)findViewById(R.id.btn1);
        list = (ListView)findViewById(R.id.listView1);

        final ArrayList<String> midList = new ArrayList<String>();
        final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, midList);
        list.setAdapter(adapter);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String s = edit.getText().toString();
                midList.add(s);
                adapter.notifyDataSetChanged();
            }
        });

        list.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
                midList.remove(i);
                adapter.notifyDataSetChanged();
                return false;
            }
        });

    }
}

 

 

그리드뷰

 

그리드뷰는 사진이나 그림을 격자 모양으로 배치해준다.

버튼이나 텍스트 등을 배치할 수 있지만 주로 사진이나 그림을 배치한다.

 

연습하기 ) 이미지 포스터를 볼 수 있는 코드 작성하기

 

activity_main.xml Code

 

<?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:padding="10dp"
    android:orientation="vertical">

    <GridView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/gridView1"
        android:gravity="center"
        android:numColumns="4"/>

</LinearLayout>

 

dialog1.xml Code

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">

    <ImageView
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:scaleType="fitCenter"
        android:id="@+id/img1"/>

</LinearLayout>

 

MainActivity.java Code

 

public class MainActivity extends AppCompatActivity {

    Integer []moveId = {R.drawable.oreo, R.drawable.lion, R.drawable.kitty,
            R.drawable.rabbit, R.drawable.cherry, R.drawable.apple,
            R.drawable.dog, R.drawable.cat, R.drawable.bear,
            R.drawable.oreo, R.drawable.lion, R.drawable.kitty,
            R.drawable.rabbit, R.drawable.cherry, R.drawable.apple,
            R.drawable.dog, R.drawable.cat, R.drawable.bear,
            R.drawable.oreo, R.drawable.lion, R.drawable.kitty,
            R.drawable.rabbit, R.drawable.cherry, R.drawable.apple,
            R.drawable.dog, R.drawable.cat, R.drawable.bear};

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

        final GridView grid;
        grid = (GridView)findViewById(R.id.gridView1);
        MyGridAdapter gAdapter = new MyGridAdapter(this);
        grid.setAdapter(gAdapter);
    }

    public class MyGridAdapter extends BaseAdapter {
        Context context;
        public MyGridAdapter(Context c){
            context = c;
        }
        public int getCount(){
            return moveId.length;
        }
        public Object getItem(int arg0){
            return null;
        }
        public long getItemId(int arg0){
            return 0;
        }
        public View getView(int position, View arg1, ViewGroup arg2){
            ImageView imageview = new ImageView(context);
            imageview.setLayoutParams(new GridView.LayoutParams(200, 300));
            imageview.setScaleType(ImageView.ScaleType.FIT_CENTER);
            imageview.setPadding(5,5,5,5);
            imageview.setImageResource(moveId[position]);

            final int pos = position;
            imageview.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast.makeText(getApplicationContext(),"클릭함",Toast.LENGTH_SHORT).show();
                    View dialogView = (View)View.inflate(MainActivity.this, R.layout.dialog1, null);
                    AlertDialog.Builder dlg = new AlertDialog.Builder(MainActivity.this);
                    ImageView imgMove = (ImageView)dialogView.findViewById(R.id.img1);
                    imgMove.setImageResource(moveId[pos]);
                    dlg.setTitle("큰 포스터");
                    dlg.setIcon(R.drawable.ic_launcher_background);
                    dlg.setView(dialogView);
                    dlg.setNegativeButton("닫기",null);
                    dlg.show();
                }
            });

            return imageview;
        }
    }
}