Develop Reference

How to avoid unnecessary Relative layout in Linear Layout

I am using a Linear Layout to display an ImageView and to make it be displayed only one half of the screen. What I have done is to add a Relative layout inside this Linear Layout so that this ImageView only occupies one half of the screen. I am getting a warning as it is normal because this Relative Layout doen't have any children but I have used it only to occupy the other half of the screen. How could I make the same result avoiding this warning?
This is what I have:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="2">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#drawable/img"
android:scaleType="fitXY"
tools:ignore="ContentDescription" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1" >

Use below code, imageView is only half the screen:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="2"
xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android">
<ImageView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="#drawable/img"
android:scaleType="fitXY"
tools:ignore="ContentDescription" />
</LinearLayout>

How to add FrameLayout inside LinearLayout

Hi i am new for android in my app i am adding Frame-layout inside LinearLayout but Frame-Layout and it's inside fields are not adding
my code is below please help me some one
main.xml:-
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:id="#+id/frame"
android:layout_width="match_parent'"
android:layout_height="wrap_content">
<TextView
android:layout_width="0dp"
android:layout_weight ="1"
android:layout_height="wrap_content"
android:background="#android:color/holo_red_dark"
android:text="something" />
<Button
android:layout_width="30dp"
android:layout_height="30dp"
android:background="#android:color/holo_red_light"/>
</FrameLayout>
<ListView
android:id="#+id/listview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/frame" />
</LinearLayout>

I think you misunderstand the purpose of FrameLayout.
http://developer.android.com/reference/android/widget/FrameLayout.html
FrameLayout is designed to block out an area on the screen to display
a single item. Generally, FrameLayout should be used to hold a single
child view, because it can be difficult to organize child views in a
way that's scalable to different screen sizes without the children
overlapping each other.
You are trying to put two items inside of it. I would suggest removing the FrameLayout. You have no need of it.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/button" />
</FrameLayout>
</LinearLayout>
This works for displaying a single button, but there's no point in having it there.

Android XML Layout - ImageView taking all space

This is my first post on Stackoverflow.
My question is related to ImageViews : I have a simple XML layout file composed of two LinearLayouts included in a general LinearLayout.
The first LinearLayout contains a simple ImageView, and the second one contains three buttons.
My problem is that the ImageView takes all the space on the screen and therefore the three buttons aren't displayed.
I've done quite a lot of research, I've tried to change everything I could to make it work and the only thing that did the trick was to turn the ImageView layout_width attribute into a dp value.
Why do I have to do that? Is it somehow related to the dimension of the original picture (1280 x 800)?
The XML file is :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/linearMainCreateTape"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="horizontal"
tools:context="com.example.anthony.walkmanfreeversion.CreateTapeActivity" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/imageView"
android:src="#drawable/highresoltape1"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Button1"/>
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Button2"/>
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Button3"/>
</LinearLayout>
</LinearLayout>

For anyone having this issue, there is a quick solution for that.
In your imageView XML add the following property:
android:adjustViewBounds="true"
for. eg
<ImageView
android:adjustViewBounds="true"
android:id="#+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="#mipmap/ic_launcher"/>
If you are using a Constraint Layout, don't forget to add the constraints.

You could use android:layout_weight in order to define how much space should be taken by the layouts:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/linearMainCreateTape"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="horizontal"
tools:context="com.example.anthony.walkmanfreeversion.CreateTapeActivity" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/imageView"
android:src="#drawable/highresoltape1"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="vertical">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button1"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button2"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button3"/>
</LinearLayout>
</LinearLayout>
In the example above both inner layouts have the same weight, so they bot fill 50% of the height.
If all views reserve the entire available height (match_parent) then the first one wins. So in your case the top level layout (linearMainCreateTape) fills the whole height and the layout which contains the ImageView does the same. So there's nothing left for the three buttons below it.

Android - position layout at bottom of screen always in the foreground

My xml file is like following:
<LinearLayout>
<ScrollView>
<LinearLayout>
</LinearLayout>
</ScrollView>
</LinearLayout>
First LinearLayout has android:layout_height="match_parent", all others android:layout_height="wrap_content". How to create a layout at bottom of screen always in the foreground with an imageview?

This is best done with a relative layout. Relative layout elements stack on top of each other unless you position them relative to each other. For instance, if you had two image views and did position them, the second image view would be placed on top of the first one.
Here is an example to get you started:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</ScrollView>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:contentDescription="#string/YOUR_CONTENT_DESC"
android:scaleType="fitXY"
android:src="#drawable/ic_launcher"/>
</RelativeLayout>

you could set the gravity of the linear layout to bottom.
android:layout_gravity="bottom"
When your creating your XML document order does matter. So for example:
<ImageView/>
<LinearLayout/>
The LinearLayout will be placed in front of the ImageView.

Try this way,hope this will help you to solve your problem with another one alternative.
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
</LinearLayout>
</ScrollView>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher"
android:adjustViewBounds="true"
android:layout_gravity="bottom|center_horizontal"/>
</FrameLayout>

Scale background image in LinearLayout

I'm having the following problem;
I have a LinearLayout with in it a ScrollView, in the ScrollView is some custom view. Now I want to put an image in the background of the LinearLayout and keep the image in its original size. But when I set the background property of the LinearLayout it stretches to fit the full screen. How can I make it so that the image keeps its original size?
My xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/root"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/some_drawable">
<ScrollView
android:id="#+id/scrollview"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:fillViewport="true">
<some.custom.layout
android:id="#+id/mainLayout"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
/>
</ScrollView>
</LinearLayout>

Code example for Egor's answer:
<FrameLayout
android:id="#+id/FrameLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
>
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:src="#drawable/background"
/>
<LinearLayout
android:id="#+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
</LinearLayout>
</FrameLayout>

Try using FrameLayout with an ImageView and LinearLayout inside. For example, try changing the alpha of the image and move it to foreground in your FrameLayout, thus the LinearLayout stays on background. Hope this helps!

<RelativeLayout
android:id="#+id/relLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.AppCompatImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#id/layoutLogin"
android:layout_alignLeft="#id/layoutLogin"
android:layout_alignRight="#id/layoutLogin"
android:layout_alignTop="#+id/layoutLogin"
android:adjustViewBounds="true"
android:background="#mipmap/ic_photo_bg"
android:scaleType="fitXY" />
<LinearLayout
android:id="#+id/layoutLogin"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
</LinearLayout>
</RelativeLayout>

Alternatively to ColdForged's suggestion, you could move from LinearLayout to RelativeLayout and use ImageView to show the image instead of changing background to it. The views in RelativeLayout can interfere unlike in LinearLayout.

You might take a look at the InsetDrawable. Either that or it would likely require you to subclass your layout to draw the way you wish as the background element doesn't have the ability you need.