grid.xml

 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/grid"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.choi.ex02.GridActivity">

    <!--android:numColumns="3" 한 라인에 출력할 컬럼의 숫자-->

    <GridView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/grid1"
        android:layout_below="@+id/txtResult"
        android:numColumns="3"
        />


    <TextView
        android:text=""
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/txtResult" />



</RelativeLayout>

 

 

 

GridActivity

 

package com.example.choi.ex02;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.widget.TextView;

public class GridActivity extends AppCompatActivity {

    //1.변수 선언
    TextView txtResult;
    GridView grid1;
    String[] items={"사과", "포도", "바나나", "자두", "귤", "자몽",
            "사과", "포도", "바나나", "자두", "귤", "자몽",
            "사과", "포도", "바나나", "자두", "귤", "자몽"
    };


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

        //2.객체 생성
        txtResult=(TextView)findViewById(R.id.txtResult);
        grid1 =(GridView)findViewById(R.id.grid1);

        //3. 아답터 생성
        ArrayAdapter<String> adapter=new ArrayAdapter<String>(
            this, android.R.layout.simple_list_item_1, items
        );

        //4. 그리드뷰에 아답터를 연결 시킴
        grid1.setAdapter(adapter);

        //5.이벤트 처리
        grid1.setOnItemClickListener(new AdapterView.OnItemClickListener() {

         //poistion : 아이템의 인덱스 값(0부터)
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                txtResult.setText(items[position]);
            }
        });

    }


}