How to access the resource of com.android.internal.R

最近在作一個android player項目，想要默認使用android的internal資源，好比：

com.android.internal.R.layout.media_controller

可是，直接使用會報編譯錯誤：

com.android.internal.R does not exist

You cannot import the internal android class, as the internal.R class isn't visible.

可是能夠經過其餘的方式來訪問，以下：

int mediaControllerId = Resources.getSystem().getIdentifier("media_controller", "layout", "android");

View layout = ((LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(mediaControllerId, this);

同理，能夠訪問：

mPrevButton = (ImageButton) layout.findViewById(Resources.getSystem().getIdentifier("prev","id", "android"));
mProgress = (ProgressBar) layout.findViewById(Resources.getSystem().getIdentifier("mediacontroller_progress","id", "android"));
mPauseButton = (ImageButton) layout.findViewById(Resources.getSystem().getIdentifier("pause","id", "android"));

getIdentifier的使用方式以下，會返回name對應的id，

Resources.getSystem().getIdentifier(name, defType, defPackage)

而上述name/defType/defPackage如何獲得？能夠從源碼中得到相應的信息