RelativeLayout - Nur letztes item wird angezeigt ?

1<?xml version="1.0" encoding="utf-8"?>
2<RelativeLayout xmlns:android="//schemas.android.com/apk/res/android"
3android:layout_width="wrap_content"
4android:layout_height="wrap_content" >
5
6
7<LinearLayout
8 android:id="@+id/layoutOverlay"
9 android:layout_width="500dp"
10 android:layout_height="300dp"
11 android:layout_centerHorizontal="true"
12 android:layout_centerVertical="true"
13 android:orientation="vertical" >
14
15 <LinearLayout
16 android:layout_width="match_parent"
17 android:layout_height="wrap_content"
18 android:orientation="horizontal" >
19 </LinearLayout>
20
21 <RelativeLayout
22 android:layout_width="match_parent"
23 android:layout_height="fill_parent"
24 android:orientation="horizontal" >
25
26 <Button
27 android:id="@+id/button1"
28 android:layout_width="wrap_content"
29 android:layout_height="wrap_content"
30 android:layout_alignParentRight="true"
31 android:layout_centerVertical="true" />
32
33 <Button
34 android:id="@+id/button2"
35 android:layout_width="wrap_content"
36 android:layout_height="wrap_content"
37 android:layout_alignParentLeft="true"
38 android:layout_centerVertical="true" />
39 </RelativeLayout>
40</LinearLayout>
41
42</RelativeLayout>

1public class MainActivity extends Activity {
2 Button btn_1;
3 Button btn_2;
4
5
6
7@Override
8protected void onCreate(Bundle savedInstanceState) {
9 super.onCreate(savedInstanceState);
10
11 setContentView(R.layout.activity_main);
12
13
14 btn_1 = (Button) findViewById(R.id.button1);
15 btn_2 = (Button) findViewById(R.id.button2);
16
17 btn_1
18 .setLayoutParams(new android.widget.RelativeLayout.LayoutParams(
19 150, 150));
20 btn_2
21 .setLayoutParams(new android.widget.RelativeLayout.LayoutParams(
22 150, 150));
23
24}
25
26}