Question

I want to make an activity which is mainly transparent except for a gridview and a textview, so my style is:

<style name="Theme.Transparent" parent="android:Theme">
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowIsFloating">true</item>
<item name="android:backgroundDimEnabled">false</item>
</style>

and my layout:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView ... android:layout_gravity="bottom" />

<GridView ...
    android:layout_gravity="bottom"
 />

However textview and gridview are in the exact center, ignoring my bottom layout gravity…

Answer 1

A LinearLayout can not do this, use a RelativeLayout instead. A RelativeLayout will give you access to the centerInParent attribute in it’s children..

here:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >


    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true">  //<---- this here is the trick
        <TextView ... 
            android:layout_gravity="bottom" />
        <GridView ...
            android:layout_gravity="bottom"
        />
    </LinearLayout>

</RelativeLayout>

You might be able to get rid of that LinearLayout, and I would suggest messing around with this. It depends on how you need the view to look.

Either way, a RelativeLayout and a layout_centerInParent should do what you want.