I have a layout like below. Now, I don't want to set the width of relative layout to fixed 240 dp. I want to set the width of the relative layout to 1/3 the width of the screen. Is it possible to do that in the xml file. If it is impossible, how can I achieve that using java code ?
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/fullscreen"
style="@style/translucent">
<RelativeLayout
android:layout_width="240dp"
android:layout_height="fill_parent"
android:layout_gravity="right"
android:gravity="center"
android:background="#88000000"
android:id="@+id/sidebar">
</RelativeLayout>
</FrameLayout>
use weightsum="3"
in the parent and layout_weight=1
in the child. Take a look a this reference
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/fullscreen"
style="@style/translucent"
android:orientation="horizontal"
android:weightSum="3">
<RelativeLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_gravity="right"
android:gravity="center"
android:background="#88000000"
android:id="@+id/sidebar"
android:layout_weight="1"
>
</RelativeLayout>
<!-- other views, with a total layout_weight of 2 -->
</LinearLayout>
You have to use a LinearLayout
to get the width of a view to be a third of its parentview.
Something like:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:background="#88000000">
</RelativeLayout>
<ViewGroup
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="2">
</ViewGroup>
</LinearLayout>
The key bit is the ratio of the layout_weights. The documentation is pretty good.
A LinearLayout
with a android:layout_orientation="horizontal"
is what you want, along with weights.
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<RelativeLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
...all your stuff... />
<View
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="2" />
</LinearLayout>
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