Develop Reference

How to show a background image resized into ImageButton size?

I have a multi level LinearLayout to show 4x6 ImageButtons for an advent calendar. But when I want to set the background of the ImageButton, it is too big. How can I set the image background to fit the ImageButton size? I want to show 24 pieces of present boxes in a nice grid.
<ImageButton
android:id="#+id/buttonOne"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="25"
android:background="#drawable/present"
android:fontFamily="#font/christmas"
android:onClick="playOne"
android:text="1"
android:textColor="#android:color/white"
android:textSize="#dimen/button_text_size" />

I think that what you want to do can be done changing/adding 2 things:
Its an ImageButton, so dont use the android:background property, but the android:src with the same drawable
Then add the property android:adjustViewBounds="true" which basically adjusts the image to fit the view while maintaining aspect ratio
I think that should do the trick, else you can also try
Use the android:scaleType property, I would try using fitXY but here are all the possible scale types: https://developer.android.com/reference/android/widget/ImageView.ScaleType
EDIT: Also, you might need to change your width and height properties, either specify a size in dp, use constraints, or wrap your ImageButtons in a GridLayout

wrap_content doesn`t work with background

There is Frame Layout, where width\height = wrap_content. But it increases to max size when I try to set a background, even if it doesn't contains any elements.How to fix it?
<FrameLayout
xmlns:android="schemas.android.com/apk/res/android";
xmlns:app="schemas.android.com/apk/res-auto";
android:background="#drawable/oblakol"
adroid:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerInParent="true" >
<TextView
android:id="#+id/textView8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</FrameLayout>

Your background is much bigger than you think. Check size of background!

Wrap content is working but your image size is large and hence you are not getting the expected results.
Try importing image as -> IMAGE ASSET so the size will be auto-Adjusted
or
set size manually!

I hope this will help you ...
wrap_content will put the background of it's original size.
Using large resolutions will cause lagging in your app while using. So, you should resize your background according to your needs : Image Resizer

When you set the dimensions(layout_width or layout_height) of a view to WRAP_CONTENT, you are giving freedom to the view to expand without any limit(as per its content ). Same is with your scenario as you've set the height and width to WRAP_CONTENT for your Frame Layout.
So whatever the space occupied on screen, its due to the large size of your android:background="#drawable/oblakol" drawable image. Try setting the height and width of the Frame Layout to some random values to test it.
android:layout_width="250dp"
android:layout_height="250dp"
I've attached some screenshots for your reference.
android:layout_width and android:layout_height set to WRAP_CONTENT. Actual dimension of the android Image is 800x799(wxh)
android:layout_width and android:layout_height set to WRAP_CONTENT. Actual dimension of the android Image is 256x256(wxh)
android:layout_width and android:layout_height set to 250dp. Actual dimension of the android Image is 800x799(wxh)
Hope it helps.

How do I set the height of an element to the same as another element?

I'm just starting out with android and trying to make a simple user interface.
I'm using TableLayout and each TableRow is supposed to contain an image and several buttons next to it. I set the width and height of the buttons to wrap_content, which is exactly what I want. Now I want the image to have exactly the same height as the buttons. The image is way bigger, so wrap_content doesn't work.
Obviously I can just adjust the dp value of the image height until it fits, but there has to be an easier way and I guess that pretty much defeats the purpose of using wrap_content in the first place...

Set the height of the image to match_parent. Your buttons are doing all the height-sizing work having the wrap_content set. When the row gets sized it uses the button height, as they say "you will be as tall as our content", and then when the image is going to be sized, it will use the available height, as specified before by the buttons. Even if the buttons are smaller than the image, the image will still take the available space.

Try this
<TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TableRow
android:id="#+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</TableRow>
</TableLayout>

ImageView Image disappear when something gets redrawn

I have a TextView and an ImageView in a LinearLayout:
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="72sp"
android:orientation="horizontal"
android:keepScreenOn="true" >
<TextView
android:id="#+id/instructionView"
android:layout_width="245sp"
android:layout_height="70sp"
android:textSize="18sp" />
<ImageView
android:contentDescription=""
android:id="#+id/ma_landmarkView"
android:layout_width="70sp"
android:layout_height="70sp"
android:layout_gravity="right" />
</LinearLayout>
In my Code, I set different Images to the ImageView (All 68x68 pixels size) with
myView.setImageDrawable(this.getResources().getDrawable(
R.drawable.mypicture));
The Problem is now, the Image is no more seen if the TextView gets other Text by .setText(...) and redraws itself. The Image also dissappears if other Views outside this LinearLayout change their size and get redrawn (e.g. an MapView that has been zoomed in/out).
If I set all .setText(...) from this TextView in comments //, the picture from the ImageView stays visible and doesn't disappear anymore.
But I don't want to go without that TextView...
I already hardcoded the Views heights and widths but that does not help.
Any Ideas ?
EDIT:
I just saw at testing, that by setting different Text to the TextView it can get a bigger width (even bigger than I stated in the *xml) if this TextView gets too width, the Image disappears. Maybe a work around solution works, that prevents the TextView from getting too width. Some1 knows how to?

Try .setBackgroundDrawable instead

You should change the different view's units to dp instead of sp. sp is usually used for the actual text size. So basically change the layout_width and layout_height to use dp units, and keep the textSize in sp units.
Please change these and re-run your application, and let me know if this changed the results. If it doesn't work, add some of your java code so I can better tell where the issue is.

Android: How do I align textview on a image background that dos not strech in xml

Ok here is the problem...
I have a image background that need some text and additional graphics on it. The background image needs to be in the center of the screen and may not stretch. Here is what i need to do:
The problem is that i need to align the text to the background image.
I've tried to wrap it all into a relative layout - something like this:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/bg_image"
android:layout_centerInParent="true"
android:src="#drawable/member_card"/>
<TextView
android:layout_height="wrap_content"
android:layout_alignLeft="#id/bg_image"
android:text="#string/membercard_info"
android:layout_marginTop="40dp"
/>
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_alignLeft="#id/bg_image"
android:layout_marginTop="200dp"
/>
</RelativeLayout>
This will not work since android adds additional padding to the image to avoid it from stretching.
Here is what happens in two different cases:
So how do I align the text to the background image?
I've solved this problem in the past in code by baking it all into one image,- but would like to do this in xml.

If you want to remove padding, you can use manually set it. However, if you want overlapping elements, you generally want to use FrameLayout. Look here: http://mobile.tutsplus.com/tutorials/android/android-sdk_frame-layout/
Set a gravity inside the frame layout to align it.

if you want an ImageView with additional layers drawn on top of that, see this thread: How to maintain multi layers of ImageViews and keep their aspect ratio based on the largest one?

There a padding around the image because you set the imageView size to fill its parent ( using match_parent )
You should try to set it to wrap its content :
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
.../>
EDIT : If your picture is bigger that the screen size, you need to have it scaled keeping the aspect ratio.
To do this, use match_parent in vertical with a scaleType to FIT_CENTER
and keep the wrap_content setting for the width ( since we want the image view left/right bounds stuck to the image content )
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:scaleType="fitCenter"
.../>
Is this better ?