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);

getResources().getIdentifier("textView01", "id", "cn.xxx.xxx");

String path = "com/drawable/resource/imageName.png";
InputStream is = getClassLoader().getResourceAsStream(path);
Drawable.createFromStream(is, "src");

int resID = getResources().getIdentifier("imageName", "drawable", "com.test.image");
Drawable image = getResources().getDrawable(resID);