Develop Reference

Image in toolbar: layout:height

In a basic activity, I am trying to put an image attached to the tool bar. In this code in the ImageView section android:layout_height="217dp". I don't want to give it this way, as I recently read that for the algorithm to work for all devices. So my ultimate choice was to use: match_parent or wrap_content. If I use 217dp my app will look different. However if I use match_parent or wrap_content for the image view, I am getting a huge tool bar, which takes almost half of the screen. What should I do?
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay"
android:background="#color/colorWagner">
<ImageView
android:layout_width="wrap_content"
android:layout_height="217dp"
app:srcCompat="#drawable/wagner"
android:layout_gravity="left"
android:id="#+id/imageView" />
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_first"
android:layout_height= "wrap_content" />

This is happening because of the size of the image. You will need to reduce the size of the image via some tools. I have had similar issue in past. Try setting a fixed height for the image before you save the image in android. It should resolve your issue

What if you try using percentage:
<ImageView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
app:srcCompat="#drawable/wagner"
android:layout_gravity="left"
android:id="#+id/imageView" />
<Space
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent"/>
You can vary the numbers in layout_weight, to adjust the percentage. In this case the percentage will be 50% for each element which are your button, and an empty space.

In that case you can use the following code in your .java file
getSupportActionBar().setLogo(R.drawable.ic_launcher);

How to Fit the Downloaded Images into the ImageView (to Eliminate the Need for Scrolling)

My app gets the album cover images from an Internet source. The image dimensions are varying from 200*200 to 400*400, therefore making scrolling necessary on some smaller devices. The layout resource codes and layout view are below.
The ImageView is the view with the red borders.
All I need is to make downloaded image to fit the imageView, so that the users won't have to scroll vertically to see the view below. How can I accomplish that? Thanks in advance...
<LinearLayout
android:id="#+id/llayoutAlbumCover"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="top|center" >
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="#+id/albumCover"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="3sp"
android:scaleType="fitCenter"
android:src="#drawable/loading" >
</ImageView>
</FrameLayout>
</LinearLayout>

use imgview.setScaleType(ScaleType.FIT_XY);
Through xml also you use like this
<ImageView
android:id="#+id/albumCover"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="3sp"
android:scaleType="fitXY"
android:src="#drawable/loading" >
</ImageView>
PS:: I know this is what you wanted, but for images where you care about aspect ratio, this will stretch it out.

You can set scale, for example imageView.setScaleType(ScaleType.fitCenter)
Samples: http://etcodehome.blogspot.com/2011/05/android-imageview-scaletype-samples.html

Using android:scaleType="fitCenter" guarantees at least one axis will be fitted in the view. Use android:scaleType="centerInside" instead. The dimensions will be equal or smaller then your view. For more options please check ImageView.ScaleType

How to resize an ImageView within a given Layout in Android?

I have a problem to make a proper layout for a special case. I experimented on that already for a while both in the designer and in code, but I couldn't find a solution, that's why I need your help.
I have to create a layout which should have a structure like pictured in the images below. It is mainly a combination of several linearLayouts. The problem I have is, that the picture can only be added within the code, because this layout is a detail view that displays information about items from a list.
On the top is the layout without an image place holder (no loaded picture - indicated in black), here the width of "linearLayout_BigLeft" is given by the width of the two buttons and the textView (which all have content) in the "linearLayout_BelowImage".
In the middle you see the layout after the picture has been loaded (image indictated in orange) in code. Depending on the aspect ratio of the android device the black colored gaps differ. I can't get the image to resize to the whole available height and adjusting its width accordingly. The "linearLayout_BelowImage" adjusts itself to the image size (the textView in it is getting wider).
On the bottom is the layout which shows the ideal state. The image always should use the whole available space in height and resize accordingly in width. The "linearLayout_BelowImage" adjusts itself to the image size (the textView in it is getting wider).
Question:
How can I get a layout (after the image is loaded in code) that looks like the bottom picture? The image, after loaded in code, has to resize itself, so it uses the whole available height and resizes its width accordingly. The "relativeLayout_Top" and the "linearLayout_BelowImage" have both fixed heights. The "scrollView_BigRight" adjusts itself based on the space that the "imageView_OrangeImage" doesn't need for itself.
I can deal with solutions that adjust the layout in code, after the image has been added, or solutions that makes the layout.xml itself flexilbe enough to deal with this situation.
Any help is highly appreciated. If you need any more information please let me know.
Below is the main content of my layout.xml, that is needed for this problem.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="#color/white">
<RelativeLayout
android:id="#+id/relativeLayout_Top"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="#color/blue" >
</RelativeLayout>
<LinearLayout
android:id="#+id/linearLayout_Big"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal"
android:background="#color/transparent" >
<LinearLayout
android:id="#+id/LinearLayout_BigLeft"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#color/transparent" >
<ImageView
android:id="#+id/imageView_OrangeImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#color/black" />
<LinearLayout
android:id="#+id/linearLayout_BelowImage"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#color/blue_white_blue" >
<Button
android:id="#+id/btn1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:background="#color/blue" />
<TextView
android:id="#+id/textView_BelowImageMiddle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#color/white" />
<Button
android:id="#+id/btn2"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:background="#color/blue" />
</LinearLayout>
</LinearLayout>
<ScrollView
android:id="#+id/scrollView_BigRight"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#color/grey" >
</ScrollView>
</LinearLayout>
</LinearLayout>

android:adjustViewBounds="true"
This one’s a manual fix for “optimized” code in scaleType="fitCenter". Basically when Android adds an image resource to the ImageView it tends to get the width & height from the resource instead of the layout. This can cause layouts to reposition around the full size of the image instead of the actual viewable size.
AdjustViewBounds forces Android to resize the ImageView to match the resized image prior to laying everything else out. There are times where this calculation won’t work, such as when the ImageView is set to layout_width="0dip". If it’s not working, wrap the ImageView in a RelativeLayout or FrameLayout which handles the 0dip flexible size instead
get it from this site
OR
Mode android:scaleType="centerCrop" uniformly stretches the image to fill the entire container and trims unnecessary.
You can change the way it default scales images using the android:scaleType parameter. By the way, the easiest way to discover how this works would simply have been to experiment a bit yourself!
get it here

Resize ImageView to make entire layout fill screen

I have a screen that contains some TextViews and an ImageView inside a LinearLayout with vertical orientation. I would like the whole thing to fit exactly in the screen (no matter what its size is) where the ImageView is the one that adjusts itself to accommodate this.
I've seen here a few variations of this question (including this) but didn't find anything that really answers my requirement.
So far i've used a solution which is not very "pretty", which is putting the entire LinearLayout inside a ScrollView, and use a custom ImageView that on its onMeasure method calculates the delta between the height of the ScrollView to the height of the screen. If the former is larger than the latter then the delta is subtracted from the ImageView's measured height.
This solution is not perfect and i would really like to know if there is a better one. Im sure there is.
Appreciate your help.
EDIT: here is the layout xml
<com.xxx.widgets.LockableScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:custom="http://schemas.android.com/apk/res/com.venews"
android:layout_width="match_parent"
android:layout_height="match_parent"
custom:scrollable="false"
android:fillViewport="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="#dimen/login_horizontal_margin"
android:paddingRight="#dimen/login_horizontal_margin"
android:orientation="vertical">
<com.xxx.widgets.ResizableToFitScreenImageView android:id="#+id/login_logo_image"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="#dimen/login_logo_margin"
android:layout_marginBottom="#dimen/login_logo_margin"
android:src="#drawable/ic_logo_and_name"/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView android:id="#+id/login_username"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"/>
<TextView android:id="#+id/login_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/login_username"/>
(...Other stuff...)
</RelativeLayout>
</LinearLayout>
</com.xxx.widgets.LockableScrollView>
EDIT2: and here's a sketch that i hope will make things clearer.
The sketch is showing 2 different screen sizes cause this solution would need to support also different devices with different screen sizes.

On the ImageView, set android:layout_height="0dp" and android:layout_weight="1". This will cause it to fill the remaining space (more about layout_weight here).
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>

Image in background without resizing the parent layout

I've got a linear layout with layout_height set to wrap_content, so that the layout height is depending of the number of text lines in it.
The problem (that has driven me crazy all morning) is that I want to set an image as background of the layout, but to be sure the image can be used whatever the layout size, I've made the image quite big in height. The goal is for the image to be cropped in height if the layout is small. But I can't manage to do that: whatever I try, the layout is resizing according to the image height.
So, how can I set an image as background of something, but cropping itself so that it doesn't reisze parent layout (of course, I don't know the parent layout size because it depends on the text inside).
As english is not my first language, hope my question is clear...
Thank you in advance.
Edit: some code sample and screenshots:
This is the original card, without the image in background.
This is the code with the image view added:
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/drill_background_img" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
... [Card Content Here]
</LinearLayout>
</FrameLayout
... and the result is my card is stretched to the height of my image. But I don't want that. I want the card the same size. But I cannot reduce image height, because, the card can have more text and be more tall, and so my image will have to be taller.

This is code for a Linear Layout that will be in center and adapt the size of text inside.
I have tested it .
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:orientation="vertical"
android:layout_centerHorizontal="true"
android:layout_marginLeft="25dp"
android:layout_marginRight="25dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/tvInfo"
android:textColor="#ffffff"
android:background="#drawable/toast_frame"
android:gravity="center" />
</LinearLayout>
Give it a try it should work. Here I am using an Image that is small enough to fit the smallest size. Android will automatically strech it. I use 9patch Images for such cases. To know more about 9patch visit this Link from developer.android.com
Simple online tool to generate 9patch
Also check this SO Answer
I have uploded toast_frame.9.png file here so that you can test it with the code I have given above
**EDIT **
change
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/drill_background_img" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
... [Card Content Here]
</LinearLayout>
</FrameLayout>
to
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/drill_background_img">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
... [Card Content Here]
</LinearLayout>
</FrameLayout>
I hope this will work.

I don't think you can crop the image when using it as "background" attribute for any view.
Image will always be stretched to fill the whole background. Normally for background you should use Nine Patches. Get familiar with it and maybe you can change your functionality or UI spec to use them instead of normal images.
The only way I know of cropping the image is in the ImageView and it's image set by "src", not "background".
I would generally avoid using fixed size images in the components that can change size. You also have to remember that in Android almost everything change size when you think about different orientations, screen sizes, screen densities.

I think that background is always resized to fit container size. But you can use FrameLayout or RelativeLayout and ImageView.
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clipChildren="true">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
...your content here...
</LinearLayout>
</RelativeLayout>