Android: Layout height in percentage of screen resolution

Question

I'm quite new in Android, so it'll probably be a stupid question, but here it goes.

I have a RelativeLayout of Activity. In this layout I have another Layout at bottom of a screen. Sometimes I hide it or make it visible, this matters not. Is it possible to make the another layout's height lets say 27% of total screen height? The idea is to keep the other content, except this layout on screen.

Have anyone tried something like this?

Answer 1

LinearLayout can handle this via android:layout_weight. For example, here is a layout containing three Button widgets, taking up 50%, 30%, and 20% of the height, respectively:

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

    <Button
        android:layout_width="fill_parent"
        android:layout_height="0dip"
        android:layout_weight="50"
        android:text="@string/fifty_percent"/>

    <Button
        android:layout_width="fill_parent"
        android:layout_height="0dip"
        android:layout_weight="30"
        android:text="@string/thirty_percent"/>

    <Button
        android:layout_width="fill_parent"
        android:layout_height="0dip"
        android:layout_weight="20"
        android:text="@string/twenty_percent"/>

</LinearLayout>

However, you cannot simply declare that an arbitrary widget at an arbitrary point in your layout file should take up an arbitrary percentage of the screen size. You are welcome to perform that calculation in Java and adjust your widget's LayoutParams as necessary, though.

Answer 2

you can try this, is more complexe but useful.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/parent_view"
android:layout_width="match_parent"
android:layout_height="match_parent">

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/app_name" />

<LinearLayout
    android:id="@+id/parent_of_bottom_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:layout_alignParentBottom="true" >

    <LinearLayout
        android:id="@+id/content_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="27">

       //Add your content here

   </LinearLayout>
</LinearLayout>