CODEWITHSUNDEEP
javaandroidandroid-linearlayoutandroid-layout-weight
Huy Than
Huy Than

Reputation: 1546

set width and height as percentage in relative layout

I would like to have this: a ViewPager overlaid by 2 arrows

enter image description here

And I get what I want by this code. However, I got these warnings of lint :

I wonder if there is a better way to get this UI as I want. 

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<android.support.v4.view.ViewPager
    android:id="@+id/dialog_instruction_pager"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >
</android.support.v4.view.ViewPager>

<!-- this LinearLayout  overlays the ViewPager -->
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical" >

    <!-- This is just the container for the left and right arrows , it is allocated with only 20% of screen height-->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight=".2"
        android:orientation="horizontal" >

        <!-- I want to align this to the left and set width only 5% of the parent -->
        <ImageButton
            android:id="@+id/instruction_dialog_left_arrow"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight=".05"
            android:background="?android:attr/selectableItemBackground"
            android:scaleType="fitCenter"
            android:src="@drawable/arrow_left_grey" />

        <!-- This is the dummy layout, standing in the middle of 2 arrows so they can be align to the left and right of the parent -->
        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight=".8" >
        </LinearLayout>

        <!-- I want to align this to the right and set width only 5% of the parent-->
        <ImageButton
            android:id="@+id/instruction_dialog_right_arrow"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight=".05"
            android:background="?android:attr/selectableItemBackground"
            android:scaleType="fitCenter"
            android:src="@drawable/arrow_right_grey" />
    </LinearLayout>
</LinearLayout>

P.S: Is there any layout that allows align children left, right, bottom (like RelativeLayout) and also allows set width, height as percentage (like "weight" attribute in LinearLayout)?

Thank you !

Upvotes: 4

Views: 3352

Answers (4)

Pranav
Pranav

Reputation: 4250

Google introduced new API called android.support.percent

1)PercentRelativeLayout

2)PercentFrameLayout

Add compile dependency like

compile 'com.android.support:percent:23.1.1'

You can specify dimension in percentage so get both benefit of RelativeLayout and percentage

 <android.support.percent.PercentRelativeLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>
     <TextView
         app:layout_widthPercent="40%"
         app:layout_heightPercent="40%"
         app:layout_marginTopPercent="15%"
         app:layout_marginLeftPercent="15%"/>
 </android.support.percent.PercentRelativeLayout/>

Upvotes: 2

M S Gadag
M S Gadag

Reputation: 2057

try this

to avoid this layout is useless (for dummy layouts) u should android:background="@android:color/transparent" and add dummy view in that linear layout because layout should not be empty.

to avoid nested weights are bad for performance add one child linear layout. and read my comments in code

and added parent layout for imageview to make image vertically center

try this code

    <?xml version="1.0" encoding="utf-8"?>
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.view.ViewPager
        android:id="@+id/dialog_instruction_pager"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"></android.support.v4.view.ViewPager>

    <!-- this LinearLayout  overlays the ViewPager -->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical">

        <!-- This is just the container for the left and right arrows , it is allocated with only 20% of screen height-->
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight=".2"
            android:orientation="horizontal">
            <!--child layout to avoid nested weight with `waighSum` property-->
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="horizontal"
                android:weightSum="100">

                <LinearLayout
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="5"
                    android:gravity="center_vertical"
                    android:orientation="horizontal">
                    <!-- I want to align this to the left and set width only 5% of the parent -->
                    <ImageButton
                        android:id="@+id/instruction_dialog_left_arrow"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:background="?android:attr/selectableItemBackground"
                        android:scaleType="fitCenter"
                        android:src="@drawable/icon_clock" />
                </LinearLayout>
                <!-- This is the dummy layout, standing in the middle of 2 arrows so they can be align to the left and right of the parent -->
                <LinearLayout
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="90"
                    android:background="@android:color/transparent">// this line also makes layout usefull
                    <!-- dummy view becouse layout should not be empty -->
                    <View
                        android:layout_width="match_parent"
                        android:layout_height="match_parent" />
                </LinearLayout>

                <LinearLayout
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="5"
                    android:gravity="center_vertical"
                    android:orientation="horizontal">
                    <!-- I want to align this to the right and set width only 5% of the parent-->
                    <ImageButton
                        android:id="@+id/instruction_dialog_right_arrow"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:background="?android:attr/selectableItemBackground"
                        android:scaleType="fitCenter"
                        android:src="@drawable/icon_clock" />
                </LinearLayout>
            </LinearLayout>
        </LinearLayout>
    </LinearLayout>
</FrameLayout>

hope it works for u

Upvotes: 2

jomartigcal
jomartigcal

Reputation: 813

Try using RelativeLayout and then set the left image to alignParentLeft and the right image to alignParentRight

Upvotes: 0

Lochana Ragupathy
Lochana Ragupathy

Reputation: 4320

Try the below code and see whether it works, 
This code will get the layout what you have attached

      <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical" >

  <android.support.v4.view.ViewPager
    android:id="@+id/dialog_instruction_pager"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@color/theme_blue" >
</android.support.v4.view.ViewPager>

<ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_centerInParent="true"
    android:background="@drawable/ic_launcher" />

  <ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_centerInParent="true"
    android:background="@drawable/ic_launcher" />

 </RelativeLayout>

Upvotes: 1

Related Questions