how to implement image rotation and image scaling on android imageview means suppose we have a image we want to image large and small by stretch from image corner like photoshop how to implement this feature
It may help you :
http://android-er.blogspot.in/2010/07/skew-bitmap-image-using-matrix.html
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I have png images that have drop shadow. There is no unproportional images scaling problem, scaling are according to the aspect ratio.
When I using Image.asset() for placing images on phone screen, they're and their shadows looks low quality and not soft.
Original image looks: http://prnt.sc/p93vo2
Image on Android App: https://prnt.sc/p93vz3
Example images are same and 700x400, 96dpi.
You should see quality difference between images.
There is also a strange stuation. The shadow density on right and bottom side is more than shadow of original image on android app.
I've tried FilterQuality.high but no change, how to fix it?
In my case, the problem was due to a bad configuration of the image resolution system.
Full answer SO: Images loose quality when using image.asset in flutter
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In apps like NoCrop an image is made to fit a resolution of 1:1 (made square) by adding some extra spaces at the top and bottom of the image (shown below).
Similarly, I wish to add some spaces to an image through my Android app, to fit a resolution of ratio, say 16:9. My app creates a video by stitching these images together, and for the video, all the images first need to be converted into a fixed resolution.
I have not used Bitmaps much, nor I am an expert in Android. Any kind of help would be appreciated! :)
Try adding these to your ImageView in xml:
android:scaleType="centerCrop"
android:adjustViewBounds="true"
This will crop your image so that it fits the ImageView
I am developing an android application which resizes android pictures. I was wondering if its possible to resize a file with resolution (1080X1920) to (500X500) square size.
Without looking too bad (quality and dimensions).
Let me show you an example.
First image:
Resized picture:
Answers using code will be appreciated
If you don't want to distort the image you have two options:
Crop the image
Implement the seam carving algorithm
Edit: this assumes you want to fill up the whole square. If not, just keep the width/height ratio and downscale the image properly so that the largest dimension fits in the side of the square.
I need to implement the custom image cropping instead of using the system cropping (i.e. "com.android.camera.action.CROP"). I need to know the exact position of the cropping bounding box but this information is not retrievable if I choose to use the default cropping. Besides, the bitmap image is down sampled too much by default cropping.
The steps are as following:
Create the original size bitmap from source (using uri). The
original size is about 4000x3000 which is too big.
The user defines the crop area to extract the ROI which results in resizing of the original image to fit the ImageView. (size of ImageView is about 700x700)
Record the position of the bounding box in the ImageView.
Retrieve the cropped area from the original image and create another bitmap for it.
Resize the cropped bitmap to fit the imageview size to show it on the screen.
This approach works on my device (ZTE nuoio with Android 4.3) well. However, the app crashes on Samsung S4 with Android 4.4.4 and Note 4 while performing step 1 probably because of the out-of-memory error.
Therefore, I try to do another approach that creates the bitmap which is down sampled from the source image, rather than having the original size bitmap image.
I need to have the information of the exact position of cropped area from the original image. That is the reason why I didn't use default cropping. Could you please help me out with my case either providing
the solutions to derive the exact coordinates of the bounding box of the cropped image in the original image as a matrix.
how to solve the out-of-memory error in step 1 using the approach I mentioned above.
Or other approach to achieve image cropping with knowing the exact coordinates of cropped area form the original image.
Thank you so much.
For Crop an image and get Coordinates use library Edmodo Croper https://github.com/edmodo/cropper
For Out of memory issue you have to down scale image.
I am trying to implement a crop image for my app.
What I want to do is that I've an imageview set to 300x300 .I am taking images from
CAMERA and GALLERY now the images can be bigger than 300x300. I want to implement
a cropping tool using which I can drag the image inside imageview so that I can select the useful portion of 300x300 of the image.
I want to implement the same feature which this app implemented for cropping.
Can anyone point me in the right direction ?
Try this:
https://github.com/biokys/cropimage
But if you want to drag and fit useful portion of a image in a Imageview than you can use MultiTouch View.
https://code.google.com/p/android-multitouch-controller/
You can move the image on a custom view. Zoom and Pinch. Once you found the useful area. Take a screenshot of the imageview.
hope any of the solutions helps :)