Android-使用getIdentifier()获取资源Id

int i=  getResources().getIdentifier("icon", "drawable", getPackageName()) ;
if(i>0)      
  {Log.i("aa","aa");}
else      
  {Log.i("vbv","aa");}

int resID = getResources().getIdentifier("org.loveandroid.androidtest:drawable/gallery_photo_1",null,null);
 
int resID = getResources().getIdentifier("org.anddev.android.testproject:drawable/bug", null, null); 
// or 
int resID = getResources().getIdentifier("bug", "drawable", "org.anddev.android.testproject");
 
//第一个参数：full_package:type/filename_without_ending是这种格式 然后其他的可以为null

int idFlag = getResources().getIdentifier(getPackageName() + ":drawable/flag", null, null);     
// 或是     
int idFlag = getResources().getIdentifier("flag", "drawable", getPackageName());    

var Drawable[] dw = new Drawable[10];     
    
for (int i = 1; i <= 10; i++) {     
  int id = getResources().getIdentifier("flag" + i,  "drawable", getPackageName());     
  dw[i-1] = getResources().getDrawable(id); 
}  

//用反射法 可以得到 所有的资源
private void      
  _DumpAllResourceIDs(Class<?> classType)      
    throws IllegalArgumentException {     
  Field[] fIDs = classType.getFields();     
             
  try {     
    for (int i = 0; i < fIDs.length; i++) {     
      Field fld = fIDs[i];     
      int nID = fld.getInt(null);     
      Log.d("dbg",     
        classType.getSimpleName() + " " +      
        i + ": " +      
        fld.getName() + "=" +     
        nID);     
    }     
  } catch (Exception e) {     
    throw new IllegalArgumentException();     
  }     
}   

import java.lang.reflect.Field;     
...     
  _DumpAllResourceIDs(R.layout.class);     
  _DumpAllResourceIDs(R.drawable.class);   

//结果
R$layout 0: main=2130903040    
R$layout 1: small_spinner_dropdown_item=2130903041    
R$drawable 0: icon=2130837504