Develop Reference

Imageview left and right white space issue

I'm trying to set 1080*1920 image in imageview but it showing white space left and right side. It showing same in all device having resolution of 480*800,720*1280,768*1280,1080*1920,1440*2560. Please check attached image Also, i tried to set android:adjustViewBounds="true" but it didn't work if i set android:scaleType="fitXY" image is streched. Please help me with some solution as i'm trying all possible way but not worked till now.
This is xml layout code :
<?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:id="#+id/img_gallery1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:src="#drawable/atest"
android:scaleType="fitXY" --> iF i use fitXY then image is streched
android:visibility="visible" />
</RelativeLayout>

Try:
android:layout_width="wrap_content"
or:
android:layout_width="match_parent"
also make sure whichever container you have the imageview inside is able to fill the full screen.

The resolution you mentioned i.e 1920x1080 is ideally a landscape resolution.
So if you intend to put the image in portrait mode, then try changing the resolution of image to 1080x1920.
Also, as Philip said, make sure the imageview's container is able to fill the screen.

How to remove paddings in a 9-patch background for textview

I have a textview which has to use a 9-patch drawable as the background. But the 9-patch drawable has left and right paddings which make the background image not stretch properly to cover the whole text. I tried resetting the paddings for the textview itself but it doesn't fix the problem.
Would anyone have any idea how to make it work?
Thanks.

The black lines on the left and top defines the stretchable are, and those on the right and bottom marks the "content" area in a 9-patch image.
So, if you don't want padding means you want a full-length content area. You should mark full-width content area by drawing a full-length line at the bottom and right of the 9patch image.
In this image, the black lines on the right and bottom represent the content area. You can see the preview on the right side, and notice the content area in light blue color. You can fill the content area by extending the bottom and right lines.

Editing 9-patch file is not a good idea, because this method may deform the background image.
I used a trick to handle this:
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<View
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/textView"
android:layout_alignTop="#+id/textView"
android:background="#drawable/your_9_patch_image"/>
<TextView
android:id="#+id/textView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="a custom text!"/>
</RelativeLayout>
I have set the 9-patch background drawable for a View behind my TextView in a RelativeLayout. So the there is no unwanted padding :)

Theoretically you cant really change the padding of 9 patch image programatically.
So you have two options:
1) Have several 9 patch images in your drawable folder for each resolution: drawable-hdpi, drawable-xhdpi etc
2) Embed a inner layout:
<RelativeLayout
android:background="#drawable/nine_patch_image_without_padding"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_margin="10dp" // Your padding goes here
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:text="How you doing"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</RelativeLayout>
It worked for me. I use the second options as it is simpler and quicker to use :)

Why is my imageview transparent/not showing properly?

I am really confused about this.I have set the background color of the whole screen to blue and I have a framelyout with image view under it. When I choose playingcard drawable as its source then the white background of the playing card is becoming blue and the image is not clear. Why is this happening?
Below is what the screen is looking like:
.
My image is :
:
And here is Part of the XML code:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#0000FF" >
<FrameLayout
android:id="#+id/frameLayoutBottom"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" >
<ImageView
android:id="#+id/ivBottom2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:src="#drawable/c11"/>
I don't want to set the background of image to white as I am using padding and I don't want the padding to be white.. The weird thing is that if I use other images that are say red then it shows perfectly, it is just when I use playing cards (I have 52 cards), it is showing like that
Any help please?
Thank you.

Your image has transparent pixels. Use an image editor to convert them to white.
Alternatively, you can specify a margin instead of padding and setBackgroundColor() on your ImageView.

Alignment weirdness in relativelayout with a background image

I have a 9 patch png in a RelativeLayout and everything looks great! However, when i create a textView in the RL, the textView is not at the top of the parent... I also tested this on the phone, same result... why does it do this?
Thanks for your assistance!
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/testLL"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/backrepeat"
>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_margin="15dp"
android:layout_gravity="center_vertical|center_horizontal"
android:background="#drawable/contentbox">
<TextView
android:text="Test"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"/>
</RelativeLayout>
</LinearLayout>

In looking up how 9patches are rendered, it basically turns the non-stretchable areas into default layout padding. This is to facilitate easy entry of stuff into the target (stretchable) area, without having to go in and define paddings manually. By assigning a 9patch, you are using it's padding. It assigns paddings to top left right and bottom based on how many px the 9patch has until it reaches the stretchable center.
You may try doing something like android:paddingTop="-50px" in your textView and see what happens. I haven't tested this, so I'd be interested to see how it turns out.
Edit to your comment with pic: Since your 9patch's top stretchy region doesnt start for about 90 px, its automatically going to pad the first element 90 px down, to place it within the "stretchy target" region. Try my above suggestion to see how it works, I'm pretty interested to see how it turns out. I don't have my IDE accessible from my Mobile, otherwise I'd test it for you ;)
Edit: I apologize, I've been saying "padding" instead of margin. But the theory is the same. Not modifying the above for permanent documentation of my idiocy.

ImageView does not center scaled down images properly

I'm having trouble getting an image to scale and center properly in an ImageView.
When up-scaling, there are no problems, but when down-scaling, the image no longer appears to be centred, and the bounds of the ImageView are wrong, like this:
problem.png
<?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">
<ImageView
android:src="#drawable/stereomood_splash"
android:scaleType="fitCenter"
android:id="#+id/imageView1"
android:layout_width="100dip"
android:layout_height="200dip"></ImageView>
</LinearLayout>
Is this a bug, and has anyone found a workaround?

You should set android:adjustViewBounds="true" as in this answer.
You also need to set either android:layout_width or android:layout_height to be wrap_content, otherwise I believe your hard-coded bounds will override any view bounds adjustments.

Edit: Put this here as it's relevant to those encountering the same symptoms.
This problem is only present in the XML editor - on a real phone or emulator the image is sized and positioned correctly. Depending on the particular image and ImageView dimensions, the editor preview will show the image incorrectly resized and/or out of the view bounds.