I am trying to display an image which will have the width of the parent view and the height will be calculated to keep the aspect ratio.
The problem is that the width of the image expands beyond parent view width, like the image is zoomed.
<com.facebook.drawee.view.SimpleDraweeView
android:id="#+id/imageview_mainimage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="centerCrop"
/>
How can I fix this?
This happens because your SimpleDraweeView doesn't have the same aspect ratio as your loaded image, and adding android:scaleType="centerCrop"will make the SimpleDraweeView try to load the content cropping the image to best fit the smallest of the 2 dimensions. You can either expect the image to have a certain ratio fresco:viewAspectRatio="1.33", or use a different option for scaleType
I want to put and ImageView with a large Y margin on my screen device, which would imply that part of the image would be out of screen, and then that the image would be cropped.
The problem is that Android is scaling the image all the time, so that it fits inside the screen, but I don't want that, I want the image to be cropped.
How can I force the ImageView to be cropped and not resized?
P.S. I tried all the possible ScaleType properties and none of them worked for me!
Code :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="200dp"
android:background="#drawable/my_image"
android:scaleType="centerCrop"
/>
</RelativeLayout>
Try replacing android:background with android:src.
First problem with your code is that you used:
android:background="#drawable/my_image"
instead of:
android:src="#drawable/my_image"
(with background none of the scaleType options work).
Now if this still doesn't help, you probably have to use scaleType="matrix" and then simply create a matrix that will do the required job. For example, let's assume that you want to:
keep the ratio of your image
scale the image so that the width parameter will equal X (for example: X can be the width of the screen)
make the top of the image visible (so crop the bottom of the image) - I'm assuming this is why centerCrop might not work for you
Here's the code:
ImageView imgView = (ImageView)findViewById(R.id.my_image_view);
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.my_image);
Matrix matrix = new Matrix();
// Let's assume X = 400
float scale = ((float) 400) / bitmap.getWidth();
matrix.setScale(scale, scale);
imgView.setImageMatrix(matrix);
And remember to make the necessary changes in the xml file.
I need something like<img width="100%" /> for Android <ImageView>. I mean resize width to all available space (shrink or enlarge width of image) and automatically change height to keep aspect ratio.
Something like <ImageView android:layout_width="match_parent" android:layout_height="auto">
Useandroid:scaleType="fitCenter"do with image what I want, but only with image, doesn't change height of View itself. When I set booth dimensions to match_parent I will get what I want, but only if I have only one image on the screen. But I need some texts under image.
It's only way create child of ImageView?
For exampleandroid:adjustViewBounds="true"does't do anything for me.
I found where is problem. Default implementation of ImageView can't enlarge image. If image is bigger than screen width android:adjustViewBounds="true" works correctly and adjust height to keep aspect ratio of image. But if image is smaller that screen width it don't upscale it.
This is cause by this code
if (newHeight <= heightSize) {
heightSize = newHeight;
}
in ImageView class (on line 688, API 10)
I made special child of ImageView which allow enlarge image to fit width.
Here is: https://gist.github.com/tprochazka/5486822
How do I display an image with the following configuration in Android?
Retain original aspect ratio (the image can be scaled, but not stretched)
Fill the width of the parent
Aligned to the bottom of the parent
The following does not work:
<ImageView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:scaleType="fitCenter"
android:layout_alignParentBottom="true"
android:src="#drawable/background" />
Using the above xml the ImageView takes the width of the parent, but the image inside the ImageView does not.
Some points.
If you want to manteint aspect ratio instead of fitCenter you should try centerInside:
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 less than the corresponding dimension of the view (minus padding).
Remember that devices using your application might have different screen sizes.
If your background image is something that can be stretched I would recommend you try a NinePatchDrawable
In Android, I defined an ImageView's layout_width to be fill_parent (which takes up the full width of the phone).
If the image I put to ImageView is bigger than the layout_width, Android will scale it, right? But what about the height? When Android scales the image, will it keep the aspect ratio?
What I find out is that there is some white space at the top and bottom of the ImageView when Android scales an image which is bigger than the ImageView. Is that true? If yes, how can I eliminate that white space?
Yes, by default Android will scale your image down to fit the ImageView, maintaining the aspect ratio. However, make sure you're setting the image to the ImageView using android:src="..." rather than android:background="...". src= makes it scale the image maintaining aspect ratio, but background= makes it scale and distort the image to make it fit exactly to the size of the ImageView. (You can use a background and a source at the same time though, which can be useful for things like displaying a frame around the main image, using just one ImageView.)
You should also see android:adjustViewBounds to make the ImageView resize itself to fit the rescaled image. For example, if you have a rectangular image in what would normally be a square ImageView, adjustViewBounds=true will make it resize the ImageView to be rectangular as well. This then affects how other Views are laid out around the ImageView.
Then as Samuh wrote, 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! Just remember to look at the layouts in the emulator itself (or an actual phone) as the preview in Eclipse is usually wrong.
See android:adjustViewBounds.
Set this to true if you want the ImageView to adjust its bounds to preserve the aspect ratio of its drawable.
To anyone else having this particular issue. You have an ImageView that you want to have a width of fill_parent and a height scaled proportionately:
Add these two attributes to your ImageView:
android:adjustViewBounds="true"
android:scaleType="centerCrop"
And set the ImageView width to fill_parent and height to wrap_content.
Also, if you don't want your image to be cropped, try this:
android:adjustViewBounds="true"
android:layout_centerInParent="true"
If you want an ImageView that both scales up and down while keeping the proper aspect ratio, add this to your XML:
android:adjustViewBounds="true"
android:scaleType="fitCenter"
Add this to your code:
// We need to adjust the height if the width of the bitmap is
// smaller than the view width, otherwise the image will be boxed.
final double viewWidthToBitmapWidthRatio = (double)image.getWidth() / (double)bitmap.getWidth();
image.getLayoutParams().height = (int) (bitmap.getHeight() * viewWidthToBitmapWidthRatio);
It took me a while to get this working, but this appears to work in the cases both where the image is smaller than the screen width and larger than the screen width, and it does not box the image.
This worked for me:
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:maxWidth="39dip"
android:scaleType="centerCrop"
android:adjustViewBounds ="true"
This is how it worked for me inside a ConstraintLayout:
<ImageView
android:id="#+id/myImg"
android:layout_width="300dp"
android:layout_height="300dp"
android:scaleType="fitCenter"
android:adjustViewBounds="true"/>
Then in code, I set the drawable as:
ImageView imgView = findViewById(R.id.myImg);
imgView.setImageDrawable(ResourcesCompat.getDrawable(getResources(), R.drawable.image_to_show, null));
This fits the image nicely according to its aspect ratio and keeps it in centre.
this solved my problem
android:adjustViewBounds="true"
android:scaleType="fitXY"
Take a look at ImageView.ScaleType to control and understand the way resizing happens in an ImageView. When the image is resized (while maintaining its aspect ratio), chances are that either the image's height or width becomes smaller than ImageView's dimensions.
Below code Working for scale image as aspect ratio:
Bitmap bitmapImage = BitmapFactory.decodeFile("Your path");
int nh = (int) ( bitmapImage.getHeight() * (512.0 / bitmapImage.getWidth()) );
Bitmap scaled = Bitmap.createScaledBitmap(bitmapImage, 512, nh, true);
your_imageview.setImageBitmap(scaled);
I have an image smaller than the screen. To have it stretched proportionally to the max and centered in the view I had to use the following code:
<ImageView
android:id="#+id/my_image"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerInParent="true"
android:adjustViewBounds="true"
android:layout_weight="1"
android:scaleType="fitCenter" />
Have in mind though, that if you have a relative layout and have some elements set to be above or below the ImageView, they will be most likely overlapped by the image.
Use these properties in ImageView to keep aspect ratio:
android:adjustViewBounds="true"
android:scaleType="fitXY"
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="fitXY"
/>
If image quality decreases in:
use
android:adjustViewBounds="true"
instead of
android:adjustViewBounds="true"
android:scaleType="fitXY"
For anyone of you who wants the image to fit exact the imageview with proper scaling and no cropping use
imageView.setScaleType(ScaleType.FIT_XY);
where imageView is the view representing your ImageView
You can calculate screen width. And you can scale bitmap.
public static float getScreenWidth(Activity activity) {
Display display = activity.getWindowManager().getDefaultDisplay();
DisplayMetrics outMetrics = new DisplayMetrics();
display.getMetrics(outMetrics);
float pxWidth = outMetrics.widthPixels;
return pxWidth;
}
calculate screen width and scaled image height by screen width.
float screenWidth=getScreenWidth(act)
float newHeight = screenWidth;
if (bitmap.getWidth() != 0 && bitmap.getHeight() != 0) {
newHeight = (screenWidth * bitmap.getHeight()) / bitmap.getWidth();
}
After you can scale bitmap.
Bitmap scaledBitmap=Bitmap.createScaledBitmap(bitmap, (int) screenWidth, (int) newHeight, true);
When doing this programmatically, be sure to call the setters in the correct order:
imageView.setAdjustViewBounds(true)
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP)
If you want your image occupy the maximum possible space then the best option would be
android:layout_weight="1"
android:scaleType="fitCenter"
Yo don't need any java code. You just have to :
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:scaleType="centerCrop" />
The key is in the match parent for width and height
I use this:
<ImageView
android:id="#+id/logo"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerInParent="true"
android:scaleType="centerInside"
android:src="#drawable/logo" />
Try using android:layout_gravity for ImageView:
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_gravity="center_vertical|center_horizontal"
android:layout_weight="1"
The example above worked for me.
I have an algorithm to scale a bitmap to bestFit the container dimensions, maintaining its aspect ratio. Please find my solution here
Hope this helps someone down the lane!
Pass your ImageView and based on screen height and width you can make it
public void setScaleImage(EventAssetValueListenerView view){
// Get the ImageView and its bitmap
Drawable drawing = view.getDrawable();
Bitmap bitmap = ((BitmapDrawable)drawing).getBitmap();
// Get current dimensions
int width = bitmap.getWidth();
int height = bitmap.getHeight();
float xScale = ((float) 4) / width;
float yScale = ((float) 4) / height;
float scale = (xScale <= yScale) ? xScale : yScale;
Matrix matrix = new Matrix();
matrix.postScale(scale, scale);
Bitmap scaledBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
BitmapDrawable result = new BitmapDrawable(scaledBitmap);
width = scaledBitmap.getWidth();
height = scaledBitmap.getHeight();
view.setImageDrawable(result);
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) view.getLayoutParams();
params.width = width;
params.height = height;
view.setLayoutParams(params);
}
Programatically apply aspect ratio to Imageview:
aspectRatio = imageWidth/imageHeight
ratioOfWidth = imageWidth/maxWidth
ratioOfHeight = imageHeight/maxHeight
if(ratioOfWidth > ratioOfHeight){
imageWidth = maxWidth
imageHeight = imageWidth/aspectRatio
} else if(ratioOfHeight > ratioOfWidth){
imageHeight = maxHeight
imageWidth = imageHeight * aspectRatio
}
After that you can use scaled bitmap to image view
Bitmap scaledBitmap= Bitmap.createScaledBitmap(bitmap, (int) imageWidth , (int) imageHeight , true);
in case of using cardviewfor rounding imageview and fixed android:layout_height for header this worked for me to load image with Glide
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="220dp"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
>
<android.support.v7.widget.CardView
android:id="#+id/card_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center|top"
card_view:cardBackgroundColor="#color/colorPrimary"
card_view:cardCornerRadius="10dp"
card_view:cardElevation="10dp"
card_view:cardPreventCornerOverlap="false"
card_view:cardUseCompatPadding="true">
<ImageView
android:adjustViewBounds="true"
android:maxHeight="220dp"
android:id="#+id/iv_full"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitCenter"/>
</android.support.v7.widget.CardView>
</FrameLayout>
You can scale image that will also reduce the size of your image.
There is a library for it you can download and use it.
https://github.com/niraj124124/Images-Files-scale-and-compress.git
How to use
1)Import the compressor-v1.0. jar to your project.
2)Add the below sample code to test.
ResizeLimiter resize = ImageResizer.build();
resize.scale("inputImagePath", "outputImagePath",imageWidth, imageHeight);
Many more methods are there according to your requirement
Quick answer:
<ImageView
android:id="#+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="center"
android:src="#drawable/yourImage"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
imageView.setImageBitmap(Bitmap.createScaledBitmap(bitmap, 130, 110, false));