Android根据图片文件名获取它的资源ID 的两种方式

/**
* 获取图片名称获取图片的资源id的方法
* @param imageName
* @return
*/
public int  getResource(String imageName){
Context ctx=getBaseContext();
int resId = getResources().getIdentifier(imageName, "drawable" , ctx.getPackageName());
return resId;
}

/**
* 获取图片名称获取图片的资源id的方法
* @param imageName
* @return
*/
public int getResourceByReflect(String imageName){
Class drawable  =  R.drawable.class;
Field field = null;
int r_id ;
try {
field = drawable.getField(imageName);
r_id = field.getInt(field.getName());
} catch (Exception e) {
r_id=R.drawable.b_nothing;
Log.e("ERROR", "PICTURE NOT　FOUND！");
}
return r_id;
}