#07 ( 다음,이전 버튼으로 사진이동하기 )

• 다음, 이전버튼을 만든다. 
• 5개를 복사하고 (res/drawable_mdpi폴더) 이미지 보이기 예제

 

(1) activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <ImageView android:id="@+id/img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/dog1"
        android:layout_gravity="center_horizontal"
        />
    <LinearLayout android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <Button android:id="@+id/preBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/prev"
            android:layout_weight="1"
            />
        <Button android:id="@+id/nextBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/next"
            android:layout_weight="1"
            />
    </LinearLayout>

</LinearLayout>

 

 

(2) MainActivity.java

 

; 버튼 이벤트 적용

  2개버튼(이전,다음)의 이벤트가 동일하기 때문에 리스너 연결함.

  ( button1.setOnClickedListener 식으로 버튼마다 생성해도 되나 동일한 이벤트이므로.. )

 

; R.drawabled.##로 배열에 참조값 가져오기.

 

package com.example.test06_quiz;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {
    int cnt=0;
    int imgs[] = {R.drawable.dog1,R.drawable.dog2,R.drawable.dog3,R.drawable.dog4,R.drawable.dog5};
    Button prevBtn;
    Button nextBtn;
    ImageView img1;
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
        prevBtn = (Button)findViewById(R.id.preBtn);
        nextBtn = (Button)findViewById(R.id.nextBtn);
        img1 = (ImageView)findViewById(R.id.img);
       
        prevBtn.setOnClickListener(mm);
        nextBtn.setOnClickListener(mm);
    }

    OnClickListener mm = new OnClickListener() {       
        @Override
        public void onClick(View v) {
            Log.i("logMsg", "index:" + cnt);
            switch(v.getId()){
            case R.id.preBtn:
                if(cnt>0){
                    img1.setImageResource(imgs[--cnt]);
                }
                break;
            case R.id.nextBtn:
                if(cnt<imgs.length -1){
                    img1.setImageResource(imgs[++cnt]);
                }
            }           
        }
    };

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }   
}