Develop Reference

how to crop top,left,right and bottom portion of imageview in android

In my application i am getting transparent pixels in my Imageview while taking screenshot.How to cut top,left,right and bottom portion of Imageview.I tried below code but not working
Bitmap bitmap = Bitmap.createBitmap(imgView.getWidth(),imgView.getHeight(), Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
imgView.draw(canvas);
Bitmap result =Bitmap.createBitmap(bitmap,imgView.getLeft()+10, imgView.getTop()+50, imgView.getWidth()-20, imgView.getHeight()-100);
bitmap.recycle();
please help me to solve this issue.

I am not very sure what are you referring with "not working", but from first sight I would suggest you to change from
Bitmap result =Bitmap.createBitmap(bitmap,imgView.getLeft()+10, imgView.getTop()+50, imgView.getWidth()-20, imgView.getHeight()-100);
to
Bitmap result =Bitmap.createBitmap(bitmap, 10, 50, bitmap.getWidth()-20, bitmap.getHeight()-100);
But I would not recommend you to use this kind of approach which explicitly setting width and height value.

Set Picture into RemoteViews

I have some SVGs in my assets folder and I need to dynamically set them in my widget (on an ImageView).
I am using this library: http://code.google.com/p/svg-android/
This library returns a Picture or a PictureDrawable.
The only methods I can see to use on RemoteViews are setImageViewBitmap which obviously takes a bitmap.
I tried looking for code to convert a Drawable to a Bitmap like this:
PictureDrawable pictureDrawable = svg.createPictureDrawable();
Bitmap bitmap = Bitmap.createBitmap(pictureDrawable.getIntrinsicWidth(), pictureDrawable.getIntrinsicHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
canvas.drawPicture(pictureDrawable.getPicture());
currentBitmap = bitmap;
But the bitmap is too small. When I create the bitmap in Illustrator I set the artboard size to 65 which is what comes through on the intrinsic width/height.
My widgets can be resized so the ImageView sizes are variable. Even if I set the width and height statically to some large number like this...
Bitmap bitmap = Bitmap.createBitmap(300, 300, Config.ARGB_8888);
then the resulting bitmap just has a bunch of whitespace below and to the right of a tiny image.
I guess I need to somehow draw the picture at a scaled up value as well as creating the Bitmap at size 300. Ideally I could figure out the size of the ImageView at runtime and set the proper sized Bitmap if I knew that. Is this the best approach and how would I do this? Perhaps there is a better approach I don't even know about?

I've not used android-svg but if it's using vanilla PictureDrawables, then it should be just a matter of not using the intrinsic bounds.
Try the following:
PictureDrawable pictureDrawable = svg.createPictureDrawable();
Bitmap bitmap = Bitmap.createBitmap(300, 300, Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
pictureDrawable.setBounds(0, 0, bitmap.getWidth(), bitmap.getHeight());
pictureDrawable.draw(canvas); // do not access the Picture directly, that defeats the purpose
currentBitmap = bitmap;
In short, use the Drawable, not its Picture and set the Drawable's bounds to be the full canvas.

Have you tried createScaledBitmap?
createScaledBitmap()

I have tried svg-android and it has not worked for me for this very reason. Not to mention its severely limited feature set.
The point of using vector graphics is that I can generate images of any appropriate size to fit the UI View size. Which means the generation method must accept the size requirements at run-time, and not always use width,height declared in <svg> tag.
Hence I used the native implementation: libsvg-android, which exactly does that.
It directly renders to a canvas with given size:
long objId = SvgRaster.svgAndroidCreate();
SvgRaster.svgAndroidParseBuffer(objId, readString(mInputStream, "UTF-8"));
SvgRaster.svgAndroidSetAntialiasing(objId, true);
SvgRaster.svgAndroidRenderToArea(objId, mCanvas, 0, 0, mWidth, mHeight);

I ended up modifying the underlying Artboard size to be 300. None of the scaling up methods worked. So the final code I used was that which I originally posted:
PictureDrawable pictureDrawable = svg.createPictureDrawable();
Bitmap bitmap = Bitmap.createBitmap(pictureDrawable.getIntrinsicWidth(), pictureDrawable.getIntrinsicHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
canvas.drawPicture(pictureDrawable.getPicture());
currentBitmap = bitmap;
Once I had a 300x300 Bitmap I was able to set it into the RemoteViews using setImageViewBitmap .
This kind of defeated the purpose of using SVGs in the first place (at least as far as using them in widgets was concerned).
My problem was not the same as User117. Perhaps he did not name the outer layer 'bounds' as was required in the library. Either way, I managed to get the library working, albeit by having to modify the SVG Artboard size.
Hopefully with the increase in screen resolution Android will introduce SVGs as part of the platform soon.

Crop particular part of image in android

I want to crop Red part from following image, Is there any simple method available in android that can crop following image.
I have found many SO questions but all are suggesting to used following code:
Bitmap croppedBitmap = Bitmap.createBitmap(bitmapOriginal, 100, 100,100, 100);
This code work well if width & height are around 2MP resolution, but if that cropped part is more than 3MP resolution than application got crashed with OOM error.
Is there any way that handle image more than 3MP during cropping?

You can used following code that can solve your problem.
Matrix matrix = new Matrix();
matrix.postScale(0.5f, 0.5f);
Bitmap croppedBitmap = Bitmap.createBitmap(bitmapOriginal, 100, 100,100, 100, matrix, true);
Above method do postScalling of image before cropping, so you can get best result with cropped image without getting OOM error.
For more detail you can refer this blog

1- Change your imageview for bitmap
final Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.img);
2-use your bitmap to crop what you want
Bitmap croppedBmp = Bitmap.createBitmap(bitmap, x, y , width , height);
3-Take care x,y from Top and left
4- to preview your bitmap again in your imageview
imageView.setImageBitmap(croppedBmp);

If you want to crop image in any shape OR only selected part then
you can use ready made open source library

How to get scaled Bitmap from ImageView

I am having a Activity which has a custom ImageView defined in the XML for Pinch Zoom functionality on an image. Now, my problem is that I want to fetch the scaled Bitmap from the Pinch Zoom functionality. For example if the user peforms zooming on the Image, then I want to store the exact size and the position of the Image as Bitmap.
This is my custom ImageView declared in XML.
<com.cam.view.PinchZoom_ImageView
android:id="#+id/gallery_selected_image_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:src="#drawable/icon"
android:scaleType="center"
/>
UPDATE:
I am trying the below code to get the scaled Image, but It returns a Blank Bitmap.
pinchZoom.setDrawingCacheEnabled(true);
pinchZoom.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
pinchZoom.layout(0, 0, pinchZoom.getMeasuredWidth(), pinchZoom.getMeasuredHeight());
pinchZoom.buildDrawingCache(true);
Bitmap_gallery_Item = Bitmap.createBitmap(pinchZoom.getDrawingCache());
pinchZoom.setDrawingCacheEnabled(false);
Any help would be appreciated. Thanks

Well, finally I can't believe that it was just a one line code. I finally succeeded using the matrix. The solution is very simple that I was storing the translation and scaling of the Image in a matrix. So, I declared that final matrix as public static and used that matrix to create draw a Bitmap on canvas.
Canvas comboImage = new Canvas(cs);
background = Bitmap.createScaledBitmap(background, width, height, true);
comboImage.drawBitmap(background, 0, 0, null);
comboImage.drawBitmap(foreground, PinchZoom_ImageView.matrix, null);
As you can see here PinchZoom_ImageView.matrix. It is a matrix that contains my final position of the scaled and translated image which I had declared as public static.

If you have scaleType="fitxy" then you can use a scaling factor to enlarge or shrink the width/height of the ImageView - It also means that you can pull back the exact height/width of the image because it has the same dimensions as it's container.
HTH

This post includes Cropping the Image from the Gallery and allows user to crop the Image and save the cropped Image and Shows in ImageView.
Seems it will help you some extends
Image Crop and show cropped Image in View

Image Processing on Custom ImageView and saving the modified image

I am using a Custom ImageView. In its onDraw I do some processing by using the canvas which is like drawing line, bitmaps based on user touch.
To save the resultant snapshot when the user want to save the image, we are using drawingCache
imageView.setDrawingCacheEnabled(true;
Bitmap.createBitmap(imageView.getDrawingCache(), 0, 0,
imageView.getHeight(), imageView.getWidth(),
matrix, true).compress(CompressFormat.JPEG, 95,
new FileOutputStream(file));
Of course I can use this to get the actual image while user presses save but the image does not contain any of the processing done on the imageView.
Bitmap bmp = ((BitmapDrawable)imageView.getDrawable()).getBitmap();
Bitmap.createBitmap(bmp, 0, 0,
bmp.getWidth(), bmp.getHeight(),
matrix, true).compress(CompressFormat.JPEG, 95,
new FileOutputStream(file));
Problem:
The size of the image saved is the size of the imageView which is fullscreen but depends on the device. For smaller screen size phones it goes down to 240 X 320.
Question:
a. Is it possible to get a decent size image irrespective of the device screen size?
b. Is it possible to do Image Processing directly on the Image that is being used in the Custom ImageView?
Thanks in anticipation!
Any thoughts?

Maybe an alternative would be use the Canvas class to do some of your drawing and image display: javadoc: android.graphics.Canvas.
The ImageView class is not the best when images need to "refreshed" often.
If you decide to stick to ImageView, don't create the bitmap using the ImageView's dimensions. Retain the aspect ratio of the image, and compose your bitmap according to the big dimensions you need. The imageView will shrink it (if needed) to fit the screen.

You can use
Bitmap.createScaledBitmap(Bitmap b, int newWidth, int newHieght, boolean filter);
and to get a bitmap from resources use
Bitmap image = BitmapFactory.decodeResource(..)
you can then use
ImageView.setImageBitmap(Bitmap bm)
to set the new bitmap to the imageview