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android – How to cut some part of image and show it in imageview

Posted by: admin June 15, 2020 Leave a comment

Questions:

I want to show only some part of image in imageview. See following image .
image part

Same example can be found in google+ app where you see all posts with images.

Any links ,code will be helpful.
Thanks

How to&Answers:

Use this code

int width = bitmapOrg.width();
int height = bitmapOrg.height();
int newWidth = 200;
int newHeight = 200;

// calculate the scale - in this case = 0.4f
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;

// createa matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, scaleHeight);

// recreate the new Bitmap
Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0, 
                  width, height, matrix, true); 

// make a Drawable from Bitmap to allow to set the BitMap 
// to the ImageView, ImageButton or what ever
BitmapDrawable bmd = new BitmapDrawable(resizedBitmap);

ImageView imageView = new ImageView(this);

// set the Drawable on the ImageView
imageView.setImageDrawable(bmd);

Answer:

// Set some constants
private static final Bitmap SOURCE_BITMAP = BitmapFactory.decodeFile(....); // Get the source Bitmap using your favorite method :-)
private static final int START_X = 10;
private static final int START_Y = 15;
private static final int WIDTH_PX = 100;
private static final int HEIGHT_PX = 100;

// Crop bitmap
Bitmap newBitmap = Bitmap.createBitmap(SOURCE_BITMAP, START_X, START_Y, WIDTH_PX, HEIGHT_PX, null, false);

// Assign new bitmap to ImageView
ImageView image = (ImageView)findViewById(R.id.image_view);
image.setImageBitmap(newBitmap);

Answer:

If someone is looking to cut image from the bottom

// recreate the new Bitmap
Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, x, y, 
                  width, height, matrix, true); 

replace following params with this logic

y : (bitmapOrg.getHeight() – 1) – (height of the red box present in the question)

height : (height of the red box present in the question)

This way you could avoid exceptions such as(for x you need to modify accordingly)

IllegalArgumentException: x + width must be <= bitmap.width() in android

IllegalArgumentException: y + width must be <= bitmap.height() in android