rules for android UI

I 'm having problems with my android UI. My buttons dont align properly. Even though i have my button aligned to right, but still wont line up correctly?

I was wondering is there any document that would explain how to layout things correctly and how would widgets behave when they are inside a tablerow? Or in other terms how does hierarchy affect the way things are aligned?? Thanks

 <?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent"
    style="?screenBackground">
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent" android:layout_height="match_parent">
        <TableLayout android:id="@+id/TableLayout02"
            android:layout_width="match_parent" android:layout_height="match_parent"
            style="?pageBackground">
            <TableRow>
                <ImageView android:layout_height="wrap_content"
                    android:layout_width="wrap_content" android:src="@drawable/camera_icon"
                    android:id="@+id/img" android:layout_grav开发者_如何学Pythonity="left"></ImageView>
                <Button android:id="@+id/button1" android:text="@string/button1"
                    style="?button"></Button>

            </TableRow>

        </TableLayout>
    </LinearLayout>
</ScrollView> 

You might have better luck using a RelativeLayout instead of LinearLayout.

For example, you could align your ImageView and Button like this:

<RelativeLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content">

    <ImageView 
        android:layout_height="60dip"
        android:layout_width="60dip" 
        android:layout_alignParentLeft="true"/>

    <Button 
        android:text="Button" 
        android:layout_alignParentRight="true" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"/>

</RelativeLayout>

To get a feel for what is possible, the starter docs on RelativeLayout are here and here.