Show whole layout within dialog in android

help.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layoutDirection="rtl">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/help_text"
        android:id="@+id/textView10" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/link_to_guide"
        android:id="@+id/textView11" />
</LinearLayout>

showActivity.java

...

Button btn = (Button) findViewById(R.id.button);

btn.setOnclickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openHelpDialog();
            }
});

private void openHelpDialog(){
        AlertDialog.Builder dialog = new AlertDialog.Builder(WireTransfer.this);

        final LayoutInflater inflater = getLayoutInflater();
        final View rootView = inflater.inflate(R.layout.help, null);
        dialog.setView(rootView);
        dialog.setTitle(getResources().getString(R.string.help_header));
        dialog.setCancelable(false);
        dialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {
                dialog.dismiss();
            }
        });
        dialog.show();
  }
  ...