Problem mit RelativeLayout

1<?xml version="1.0" encoding="utf-8"?>
2<RelativeLayout
3 xmlns:android="http://schemas.android.com/apk/res/android"
4 android:orientation="vertical"
5 android:layout_width="wrap_content"
6 android:layout_height="wrap_content">
7 <VideoView android:id="@+id/dialog_play_video_VideoView" android:layout_alignParentTop="true" android:layout_alignParentLeft="true" android:layout_width="wrap_content" android:layout_height="wrap_content"></VideoView>
8 <ImageView android:layout_height="wrap_content" android:id="@+id/dialog_play_video_ivCancel" android:layout_margin="10dip" android:layout_width="wrap_content" android:onClick="onClick" android:src="@android:drawable/ic_delete" android:layout_alignParentTop="true" android:layout_alignParentLeft="true"></ImageView>
9
10</RelativeLayout>

1Log.i("CSI","preparing Video!");
2 final Dialog videoDialog = new Dialog(this, R.style.videoDialog);
3 videoDialog.setContentView(R.layout.dialog_play_video);
4 videoDialog.show();
5 final ImageView cancelButton = (ImageView)videoDialog.findViewById(R.id.dialog_play_video_ivCancel);
6 cancelButton.setOnClickListener(new OnClickListener() {
7
8 @Override
9 public void onClick(View v) {
10 videoDialog.dismiss();
11
12 }
13 });
14
15 final VideoView vView = (VideoView)videoDialog.findViewById(R.id.dialog_play_video_VideoView);
16 vView.setVideoURI(Uri.parse(videoUrl));
17 vView.start();