在Android/data/com.yourpakagename/mydirectory中创建文件夹

我试图在Android/data/com.yourpakagename/mydirectory中创建一个文件夹 我用过这段代码,但它在内部创建了文件夹。

public void Createfol(){
File mediaStorageDir = new File(Environment.getExternalStorageDirectory(), "MyNew directory");
if (!mediaStorageDir.exists()) {
    if (!mediaStorageDir.mkdirs()) {
        Log.d("App", "failed to create directory");
      //  return null;
    }
    else {
        Log.d("Apppppp", "create directory");
    }
}

但是我想在data/com.packagename目录中创建文件夹

    File myfolder = getFilesDir();
    File f = new File(myfolder, "aaaaa");
    f.mkdir();
    if (!f.exists())
        if (!f.mkdir()) {
            Toast.makeText(this, myfolder + " can't be created.", Toast.LENGTH_SHORT).show();

        } else
            Toast.makeText(this, myfolder + " can be created.", Toast.LENGTH_SHORT).show();
    else
        Toast.makeText(this, myfolder + " already exits.", Toast.LENGTH_LONG).show();

在每次运行时都显示了StuST已经存在,但是我不能看到COM.PACGAGENAMY目录。这有什么问题?