Develop Reference

ImageViews in LinearLayout - messing up the scale

I been struggeling with this for a whole day now. I want 3 Image Views in my LinearLayout. As you can see the scale is not correct at all. All of my icons have a size of 24x24 px. Been experimenting with different propertiers inside of my ImageViews.
Here is my XML-code:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginTop="45dp"
android:orientation="horizontal">
<ImageView
android:id="#+id/tList"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:scaleType="fitXY"
android:background="#drawable/ic_home_black_24px" />
<ImageView
android:id="#+id/ist"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:scaleType="fitXY"
android:background="#drawable/ic_help_black_24px"
/>
<ImageView
android:id="#+id/ations"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:scaleType="fitXY"
android:background="#drawable/ic_settings_black_24px"
/>
</LinearLayout>

I pasted your code on a layout file in my Android Studio, an it seems that the weight and scaleType attributes are messing up your view. This is how I declared a 24 by 24 ImageView:
<ImageView
android:id="#+id/ations"
android:layout_width="24dp"
android:layout_height="24dp"
android:background="#drawable/your_drawable"
/>
You can check full doc about weight here, but what is basically saying is that if you put weight on several attributes under a LinearLayout, you're adding a priority to grow when the screen does. Since the 3 ImageViews have 1 as weight, they grow with the same priority, and since the fill_parent is being called also, they will force to fit in the parent layout params, looking oddly.

Change all of your ImageView's width to "0dp" and replace background to src like this :
<ImageView
android:id="#+id/ations"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:scaleType="fitXY"
android:src="#drawable/ic_settings_black_24px"
/>

putting button in top left corner of screen

I'm fairly new to Android Studios so sorry if this may come of as a stupid question.
I'm trying to put two buttons on the top of my screen. I want them to be in the top left and right corner like in this image.
However this is what they look like.
I don't want any space between the top of the screen and the two buttons. This is my code..
LinearLayout
<LinearLayout
android:layout_marginTop="0dp"
android:id="#+id/LinearLayout02"
android:layout_height="wrap_content"
android:layout_width="fill_parent">
<ImageButton
android:layout_width="wrap_content"
android:layout_height="50dp"
android:id="#+id/settingsBTN"
android:layout_weight="1"
android:src="#drawable/HomeBTNunpressed"/>
<View android:layout_width="3dp"
android:layout_height="50dp"
android:background="#android:color/black"/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="50dp"
android:id="#+id/homeBTN"
android:layout_weight="1"
android:src="#drawable/settingsBTNunpressed"/>
</LinearLayout>

First of all in parent don't use fillParent(Deprecated) rather use MatchParent.
Second if using linear layout and specifying weight for view and in your case you want to devide space equally then specify width 0dp and weight 1 to both and weightsum 2.
Third use any layout containing ImageView at center and specify background color to whatever you want
You are using Image Button, and image gets resized in aspect ratio so don't fit accordingly.

Actually you are using Image Button so that border is actually of button.Instead of using image button you can use Image View and make it clickable in your code.I have used my own Image here but you can use your own Image in your xml.
<LinearLayout
android:id="#+id/LinearLayout02"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="horizontal"
xmlns:android="http://schemas.android.com/apk/res/android">
<ImageView
android:layout_width="match_parent"
android:layout_height="50dp"
android:id="#+id/settingsBTN"
android:layout_weight=".5"
android:layout_marginTop="0dp"
android:background="#B6B6B6"
android:src="#drawable/username_icon"/>
<View android:layout_width="3dp"
android:layout_height="50dp"
android:background="#android:color/black"/>
<ImageView
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_weight=".5"
android:layout_marginTop="0dp"
android:background="#B6B6B6"
android:src="#drawable/username_icon"/>
</LinearLayout>

Android LinearLayout horizontally or vertically oriented items fill remaining space

I wonder if it is possible to have two items in a LinearLayout one wraps its content and the other fills the remaining horizontal space. I do this frequently in WPF (.NET) by specifying
HorizontalAlignment="Stretch".
For example:
<ImageView
android:layout_width="wrap_content"
android:layout_height="24dp"
android:background="#0000FF"/>
<ImageView
android:layout_width="match_parent"
android:layout_height="24dp"
android:background="#FF0000"/>
When I do this the second ImageView fill the whole horizontal space as I expected. I tried to set both wrap_content and use gravity such as android:gravity="start" and android:gravity="fill_horizontal" for the second one it did not worked.
NOTE: I can achieve something similar by specifying weight attribute. But this is providing a division according to the percent value. This is not I want.

You can do this using the weight attribute itself. Try the following method
<ImageView
android:layout_width="wrap_content"
android:layout_height="24dp"
android:background="#0000FF"/>
<ImageView
android:layout_width="0dp"
android:layout_height="24dp"
android:layout_weight="1"
android:background="#FF0000"/>
include this in your horizontal linear layout

You need to use a Relative layout for this. Also you either need to specify a width for first image view or it should contain an image otherwise, how can the imageview wrap the content.
You can use like below :
<?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" >
<ImageView
android:layout_alignParentLeft="true"
android:id="#+id/imgFirst"
android:layout_width="50dp"
android:layout_height="24dp"
android:background="#0000FF" />
<ImageView
android:layout_width="match_parent"
android:layout_height="24dp"
android:layout_alignParentRight="#+id/imgFirst"
android:layout_toRightOf="#+id/imgFirst"
android:background="#FF0000" />
</RelativeLayout>

How can I evenly space my ImageViews in a RelativeLayout

I had a Android application built in which I had 3 ImageViews placed horizontally across a LinearLayout, they were placed with a android:layout_width="0dp" and android:layout_weight="1" such that they had an even spread in the layout.
Now I have to switch to use a RelativeLayout (because I want to overlap another image and that can't be done with a LinearLayout) so I want to start with replicating the same effect of having the 3 ImageViews evenly spread/scaled across the parent layout, but I'm not sure how to achieve this.
I feel like I need to make use of the android:scaleType... maybe center crop:
Scale the image uniformly (maintain the image's aspect ratio) so that both dimensions (width and height) of the image will be equal to or larger than the corresponding dimension of the view (minus padding).
Which sounds good but I can't seem to get it to work right... Any thoughts on how I would achieve this even spread of ImageViews across my RelativeLayout?
Snippet of code right now:
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal" >
<ImageView
android:id="#+id/dragcircle"
android:layout_width="wrap_content"
android:tag="circle"
android:layout_alignParentLeft="true"
android:layout_height="wrap_content"
android:adjustViewBounds="false"
android:scaleType="centerCrop"
android:src="#drawable/circle" />
<ImageView
android:id="#+id/dragsquare"
android:layout_width="wrap_content"
android:tag="square"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/dragcircle"
android:adjustViewBounds="false"
android:src="#drawable/square" />
<ImageView
android:id="#+id/dragtriangle"
android:layout_width="wrap_content"
android:tag="triangle"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/dragsquare"
android:adjustViewBounds="false"
android:src="#drawable/triangle" />
Note: I can't find a question with the same constraints as this one on SO. There are a number of questions like:
Android: how evenly space components within RelativeLayout?
and
android RelativeLayout, equal spacing?
But if you check out the details you'll see that they are people who have not considered the LinearLayout as an option for equal spacing and switching layout types ends up being the solution. I have, I was using it, but it does not work for me because I need to overlap an image:
Note the example, I have 3 ImageViews with basic shapes, but I also have a 4th ImageView (it starts hidden) which is overlapping the middle one. This is why I must use a RelativeLayout

I think you're going to want to go back to your original LinearLayout to meet all of your needs here.
If the size of your fourth image must match one of your existing image then either you'd want to create a resource that is a composite of the two images to swap to when it needs to be overlaid or replace your center ImageView with a RelativeLayout or FrameLayout that contains the ImageView. When you need to add the fourth image, add it to that layout.
Something like:
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<ImageView
android:id="#+id/dragcircle"
android:layout_width="0dp"
android:layout_weight="1"
android:tag="circle"
android:layout_height="wrap_content"
android:scaleType="centerCrop"
android:src="#drawable/circle" />
<FrameLayout
android:id="#+id/centerimagewrapper"
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1" >
<ImageView
android:id="#+id/dragsquare"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:tag="square"
android:src="#drawable/square" />
<ImageView
android:id="#+id/arrow"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:src="#drawable/arrow"
android:visibility="invisible" />
</FrameLayout>
<ImageView
android:id="#+id/dragtriangle"
android:layout_width="0dp"
android:layout_weight="1"
android:tag="triangle"
android:layout_height="wrap_content"
android:src="#drawable/triangle" />

You could hide the icon you want to place on existing images and keep your previous LinearLayout to achieve this. Each component of your LinearLayout would be a custom layout (inflated):
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/relativeLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#android:color/transparent"
>
<ImageView
android:id="#+id/img"
android:layout_width="100dip"
android:layout_height="100dip"
android:layout_centerInParent="true"
android:scaleType="fitXY"
android:background="#android:color/transparent"
android:src="img1_src"
/>
<ImageView
android:id="#+id/imgOverlap"
android:layout_width="50dip"
android:layout_height="50dip"
android:layout_centerInParent="true"
android:scaleType="fitXY"
android:adjustViewBounds="true"
android:background="#android:color/transparent"
android:src="img2_src"
android:visibility="gone"
/>
</RelativeLayout>
It appears not possible to use "layout_weight" in a RelativeLayout.
You could also consider a GridView and set its number of columns; each item of the GridView would be the inflated layout above.

you could also do it programatically and tell them to be 33% of the screen width. Look at DisplayMetrics and the attributes of each ImageView if you want to achieve this.

Try this
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="#+id/dragcircle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:scaleType="fitXY"
android:src="#drawable/circle"
android:tag="circle" />
<ImageView
android:id="#+id/dragtriangle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:src="#drawable/triangle"
android:scaleType="fitXY"
android:tag="triangle" />
<ImageView
android:id="#+id/dragsquare"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="#+id/dragtriangle"
android:layout_toRightOf="#id/dragcircle"
android:src="#drawable/square"
android:scaleType="fitXY"
android:tag="square" />
</RelativeLayout>

Picture is too big to see all views

I have a PizzaOverview.
XML:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<TextView android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="" android:id="#+id/pizza_tv" android:gravity="center_horizontal" android:textSize="15pt"></TextView>
<ImageView android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="#+id/pizza_iv" android:src="#drawable/icon" android:layout_gravity="center_horizontal"></ImageView>
<RatingBar android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="#+id/pizza_rb" android:layout_gravity="center_horizontal"></RatingBar>
<TextView android:layout_height="wrap_content" android:text="" android:id="#+id/pizza_date" android:gravity="center|center_horizontal" android:layout_width="fill_parent"></TextView>
<RelativeLayout android:id="#+id/relativeLayout2" android:layout_width="fill_parent" android:layout_height="fill_parent">
<Button android:text="close" android:layout_height="wrap_content" android:id="#+id/pizza_bt" android:layout_alignParentBottom="true" android:layout_width="fill_parent"></Button>
</RelativeLayout>
</LinearLayout>
If the picture is too big the date is invisible.

add scroll view to your layout or fix the size of imageview
add the scroll view to your layout
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<TextView android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="" android:id="#+id/pizza_tv" android:gravity="center_horizontal" android:textSize="15pt"></TextView>
<ImageView android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="#+id/pizza_iv" android:src="#drawable/icon" android:layout_gravity="center_horizontal"></ImageView>
<RatingBar android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="#+id/pizza_rb" android:layout_gravity="center_horizontal"></RatingBar>
<TextView android:layout_height="wrap_content" android:text="" android:id="#+id/pizza_date" android:gravity="center|center_horizontal" android:layout_width="fill_parent"></TextView>
<RelativeLayout android:id="#+id/relativeLayout2" android:layout_width="fill_parent" android:layout_height="fill_parent">
<Button android:text="close" android:layout_height="wrap_content" android:id="#+id/pizza_bt" android:layout_alignParentBottom="true" android:layout_width="fill_parent"></Button>
</RelativeLayout>
</LinearLayout>
</ScrollView>
</LinearLayout>

Ensure that the images you supply to the activity are the correct resolution and size.
Also make sure that you have separate layouts for separate screen size categories.
Read this section of the android documentation for more details on layouts and managing different screen sizes. It tells you the basics you'll need.

You could place your image with the rating bar and the text below it in a RelativeLayout. Give a marginBottom to your RelativeLayout equal to the height of your Button. Then place your text, give it an id and add android:layout_alignParentBottom="true". Set the height of the image to fill_parent and add attribute android:layout:below="id_of_text".

You can as the other answer states make the screen scrollable. But if your content is dynamic (and depending on device it is arguable to say you content will ALWAYS by dynamic) you should make sure the that ImageView has it's bounds set correctly.
In the source code you have:
<ImageView android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="#+id/pizza_iv" android:src="#drawable/icon" android:layout_gravity="center_horizontal"></ImageView>
You should instead have:
<ImageView android:layout_height="0dp"
android:weight="1"
android:layout_width="match_parent"
android:id="#+id/pizza_iv"
android:src="#drawable/icon"
android:layout_gravity="center_horizontal"
android:scaleType="centerInside"/>
The extra attribute of weight will make your view fill any available space along the orientation set in the bounding LinearLayout. This is dependant on the weight of other views along that orientation (as the other views have no weight value in this case it will fill all space up until the edge of your fixed views).
The extra attribute of scaleType="centerInside" will make your image sit in the center of the bound's you have suggested (which are the width of the screen and all available space vertically) without ever growing large enough to overlap the bounding container.
When using ImageView you should keep in mind that the ImageView is a bounding container for an Image. It can be as large or as small as possible but is only a mechanism for telling the UI where to place an image. The scaleType attribute is what you use to say how you want the image placing within this bounding countainer. Using "wrap_content" on an ImageView isn't effective and can lead to trouble later in the design (especially when considering different devices).