아래처럼 소스를 적용해봤습니다. 왜 안되는지 알수가 없내요

 

res/drawable/main_480_800.png (이미지를 읽어올려고 합니다.)

 

ImageView iv_intro_img    = (ImageView)findViewById(R.id.iv_intro_img);

 

long width      = getAppWidth();  //480
long height     = getAppHeight(); //800

String imgId = "main_"+width+"_"+height;    //main_480_800

 

int resId = getResources().getIdentifier(imgId, "drawable",getPackageName());
//  int resId = getResources().getIdentifier(getPackageName()+":drawable/main_"+width+"_"+height, null,null); 
System.out.println("  resId = ["+resId+"]");   <--     resId = [2130837508]

                                                                         R.java에 있는  public static final int main_480_800=0x7f020004; 이놈과 틀립니다... ^^;


Drawable draw = getResources().getDrawable(resId);
iv_intro_img.setBackgroundDrawable(draw);   <---- NullPointerException 발생

 

Caused by: java.lang.NullPointerException  

 

이게 적용이 되긴 하는건가요?

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