안드로이드 갤러리 폴더에서 자동으로 그림 읽어오는 방법을 모르겠습니다

Question

인터넷에서 찾은 갤러리 코드로 공부중인데 이 코드는 drawable 폴더에 있는 파일을

 

일일히 등록해야 하는 코드더군요. 근데 보통 갤러리는 폴더에 있는걸 자동으로 읽지 않습니까?

 

아래 코드에서 폴더에 있는 그림들 자동으로 읽으려면 어떻게 수정해야 하는지 알려주세요.

 

 

package org.snowpard.proects.eighteen;

 

import java.util.ArrayList;

import java.util.List;

import java.net.Socket;

 

 

import android.os.Bundle;

import android.app.Activity;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.util.DisplayMetrics;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MotionEvent;

import android.view.View;

import android.view.View.OnTouchListener;

import android.view.animation.AnimationUtils;

import android.widget.CheckBox;

import android.widget.ImageView;

import android.widget.TextView;

import android.widget.ViewFlipper;

 

public class MainActivity extends Activity {

 

private ViewFlipper gallery;

private TextView txtPages;

private CheckBox checkBoxLoop;

private float fromPosition;

private int count;

private List<Bitmap> items;

private LayoutInflater inflater = null;

 

String ip = "127.0.0.1";

int port_number = 8888;

 

private void initList()

{

items = new ArrayList<Bitmap>();

items.add(BitmapFactory.decodeResource(getResources(), R.drawable.sample_0));

items.add(BitmapFactory.decodeResource(getResources(), R.drawable.sample_1));

items.add(BitmapFactory.decodeResource(getResources(), R.drawable.sample_2));

items.add(BitmapFactory.decodeResource(getResources(), R.drawable.sample_3));

items.add(BitmapFactory.decodeResource(getResources(), R.drawable.sample_4));

items.add(BitmapFactory.decodeResource(getResources(), R.drawable.sample_5));

items.add(BitmapFactory.decodeResource(getResources(), R.drawable.sample_6));

items.add(BitmapFactory.decodeResource(getResources(), R.drawable.sample_7));

}

 

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

 

initList();

 

inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

 

this.txtPages = (TextView)findViewById(R.id.txtPages);

this.checkBoxLoop = (CheckBox)findViewById(R.id.checkBoxLoop);

this.gallery = (ViewFlipper)findViewById(R.id.gallery);

this.gallery.setOnTouchListener(new OnTouchListener() {

 

@Override

public boolean onTouch(View v, MotionEvent event) {

switch (event.getAction())

       {

       case MotionEvent.ACTION_DOWN:

           fromPosition = event.getX();

           break;

       case MotionEvent.ACTION_UP:

           float toPosition = event.getX();

           if (fromPosition > toPosition + 20)

           {

            next();

            return true;

           }

           else if (fromPosition < toPosition - 20)

           {

       previous();

            return true;

           } 

       default:

           break;

       }

       return true;

}

});

 

gallery.addView(addImage(items.get(0)));

updateTextView();

}

 

public void next()

    {

if (count >= items.size() - 1 && !checkBoxLoop.isChecked())

return;

else if (count >= items.size() - 1 && checkBoxLoop.isChecked())

count = -1;

 

count++;

addNextImage(count, false);

    gallery.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.go_next_in));

        gallery.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.go_next_out));

        gallery.showNext();   

        removeImages();

        updateTextView();

    }

 

------하략