I have this scenario. So the image is larger than the container
I want it to scale down or scale up depending on the container size but at the same time put it on the center and crop the remaining (horizontally).
So I did something like this.
<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
android:src="#drawable/header_long"
android:gravity="center"
android:antialias="true"
android:dither="true"/>
However it looks like this now. The top, bottom, left and right is cropped.
I want it to be something like this.
try this
android:scaleType="centerCrop"
Like ben75 proposes, you can put your bitmap into am ImageView and use
android:scaleType="centerCrop"
If you want to use your image as a background, consider making it a 9-patch image. They define areas that may be stretched if the image is too small. They also define padding. Note that 9-patch images grow as needed but they never shrink, so make them as small as the smallest size you like them to get.
Related
So in my App, when the keyboard appears, the whole layout is resized to fit above it, which is exactly what I want except for the background image, I want it to stay the same size.
After some research, I saw a solution was to set the background programmatically (not using an ImageView in the XML):
getWindow().setBackgroundDrawableResource(R.drawable.background);
Which works to some extent, as it dosn't get resized when the keyboard appears, but the image is stretched to fit the screen's ratio. I found another solution to combine using xml resources:
<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
android:src="#drawable/background"
android:tileMode="repeat">
</bitmap>
Using this, the drawable stays the right ratio but isn't scaled down to the size of the screen (tried using the gravity attribute but it didn't do anything).
You don't have control over scaling with a background drawable. What you could do is put an image view over the root layout taking the entire size. Then you can use the scale options of the ImageView to scale it as you would any other image (probably FITX in this case, since you don't want it to scale with a change in Y). Just make the ImageView the first view inside the parent so it takes the bottom of the z order.
I have a PNG file which is a one-pixel-wide, 283-pixel-tall gradient image, which I need to stretch across the background of an ImageView, stretching only horizontally. I attempted to set the asset as a background to an ImageView like this:
<ImageView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#drawable/gradient_tile"
android:layout_gravity="bottom|center"
android:scaleType="matrix"/>
but that just creates a one-pixel line in the middle of the parent view.
Is there a way to do this, or do I need to request a wider image, and use a 9-patch?
Thanks in advance.
UPDATE:
I ended up having to set minimum height properties in the XML as follows:
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="119dp"
android:background="#drawable/gradient_tile_drawable"
android:id="#+id/tiledGradientBackground"
android:layout_gravity="bottom|center"
android:scaleType="matrix"/>
...and then set minimumWidth to the width of the parent view in code. Not sure why this solved it, but it did...
int width = holder.container.getResolvedWidth();
holder.tiledGradientBackground.setMinimumWidth(width);
Try this (tiling instead of stretching):
Put in your drawable folder a file called bg.xml:
<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
android:src="#drawable/your_1px_wide_image"
android:tileMode="repeat"
/>
and set it as your layout background
android:background="#drawable/bg"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
I tested it and it works fine.
This image
is giving this result.
Note that I put some extra padding - this screen is 320*480 wide, so the gradient is approx 1/3rd the total screen height (including title and status bars + the extra padding)
scaletype effects the src image of ImageView and not the background, if the image view is used only for background set the image as src and used fitXY scaletype.
You should create a drawable like Klaus66 & CommonsWare suggested and set it as a background.
Actually if you have a 1px gradient you probably can just create a GradientDrawable xml, will look better across different devices.
http://developer.android.com/reference/android/graphics/drawable/GradientDrawable.html
You shouldn't use an extra ImageView just set it as the background of your top layout or even the background of your theme, see my answer here: Android SplashScreen
I need to set the layout's background dynamically by calling myView.setBackgroundDrawable(BitmapDrawable bdb), but I want to crop the image rather than stretching it in the layout, is there a way doing it?
I was trying to create the drawable as below to set the gravity, but the challenge is I can't hardcode the android:src to a static drawable since the image source has to be dynamic.
<bitmap android:src="#drawable/background" android:gravity="center" />
Any suggestion would be really appreciated!
I believe the android:gravity attributes you are looking for are clip_vertical and clip_horizontal, but a word of advice. These attributes may not behave the way you think they should. You cannot use them to clip an image in both directions, only one. The following code:
<bitmap
android:src="#drawable/background"
android:gravity="clip_vertical|clip_horizontal" />
does not allow the image to be cropped in both directions...it actually fits the image inside the view as if you had not set either one. It also can be confusing that setting a clip parameter essentially sets that direction to fit the view, with the other direction being cropped out. A few examples:
<!-- Force fit top/bottom, crop left/right with image centered -->
<bitmap
android:src="#drawable/background"
android:gravity="clip_vertical" />
<!-- Force fit top/bottom, align image left and crop right edge -->
<bitmap
android:src="#drawable/background"
android:gravity="left|clip_vertical" />
<!-- Force fit left/right, crop top/bottom with image centered -->
<bitmap
android:src="#drawable/background"
android:gravity="clip_horizontal" />
<!-- Force fit left/right, align top and crop bottom egde -->
<bitmap
android:src="#drawable/background"
android:gravity="top|clip_horizontal" />
Notice that these settings allow an image larger than the view to be cropped, but if the image is smaller than the view, its contents will still be stretched to fit. In order to govern how an image will behave in a <bitmap> tag when it is smaller than the view, look at tileMode. Note that tileMode and gravity cannot be used together; gravity will be ignored if both are included.
If you need more dynamic control of how the image scales in addition to this, and you do not want to use an ImageView, you could also wrap the resulting Drawable in a ScaleDrawable and configure the x/y scale percentages in Java code based on the measured view sizes.
You want to use ImageView.ScaleType.CENTER_CROP
I have a 640px wide, 208px tall PNG that I've placed in my /drawable folder and I'm having a very hard time properly placing it in an ImageView. I want to scale the image so that it maxes out the horizontal resolution, and I want it to scale vertically only as much as it takes to stay in proportion.
The problem I am having is that my ImageView ends up taller than it needs to be to fit the image. The image itself looks perfect; as wide as the screen and in proportion. But the ImageView appears to have padding on the top and bottom. From what I can tell it's the drawable that the ImageView contains that's actually too tall.
I can't post an image because I'm new to SO, but if I did it would be of the Graphical Layout view. When I click on the ImageView the regular blue box shows up around it, but with padding on the top and bottom, the same padding I'm seeing on the device. Even if I drag the blue box to attempt to resize the ImageView, I am not allowed to make it any smaller than it already is (perhaps because the ImageView thinks the drawable is that tall, or something). From what I can tell, this may have something to do with the density of the image...the ImageView ends up being 312 pixels tall (208*1.5) on an hdpi device.
Here is my XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView android:id="#+id/back" android:src="#drawable/categoryheader2"
android:layout_width="wrap_content" android:layout_height="wrap_content">
</ImageView>
</RelativeLayout>
Thanks in advance for any help!
I guess android:adjustViewBounds="true" on the ImageView should do the trick. I recently had a similar problem, when I was trying to scale an image to fit the whole width of the view without loosing its proportions.
did you tried the tag : android:scaleType="fitXY" or android:scaleType="centerCrop" on your ImageView ?
I have an ImageView that is defined in the following way:
<ImageView
android:id="#+id/cover_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_below="#id/title"
android:layout_above="#id/divider"
android:adjustViewBounds="true"
android:src="#drawable/image_placeholder"
android:scaleType="fitStart"/>
Now after downloading a new bitmap I change the drawable. The image now appears in the top left corner of the ImageView. Is there a way to have the image fill up the whole height that is possible and then adjust the width of the view to enable scaling the image without changing the ascpect ratio?
The image fills up all the space on a standard screen but on a WVGA Resolution the image takes only about half of the actual height of the ImageView.
If I'm understanding you correctly, what you need to use is the centerCrop scaleType. fitStart scales the image proportionally, but neither the width nor height will exceed the size of the view, and the image will, as you said, have a top|left gravity.
Using centerCrop scales the image proportionally, but causes the shortest edge of the image to match the size of the view, and if there is additional data on the long side that does not fit, it is simply cropped off. The gravity is, of course, center. The below worked for me:
<ImageView
android:src="#drawable/image_placeholder"
android:id="#+id/cover_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="centerCrop"
/>
You can change scale type to fitXY via call to
imageView.setScaleType(ScaleType.FIT_XY);
simply do it in xml like
android:scaleType="fitXY"
Basically the answer here is that there is no predefined value for what you are trying to achieve. The solution is to create a Matrix that fits to your needs and call setImageMatrix(matrix) on your ImageView.