CODEWITHSUNDEEP
androidbitmapandroid-imageview
James andresakis
James andresakis

Reputation: 5405

Android - How to enlarge a bitmap

I usually download images that are larger in size and shrink them using an imageview but lately Im trying to deal with my apps not working on a lesser network connection so I was wondering how can I increase the size of an image once it gets to the device. I tried resizing the image once it was in an imageview but the imageview will get no larger than the original image. Im sure theres a really easy way to increase or blow up an image on the device but I havent come across it yet.

So.....how can I increase the size of an image. Id like to blow it up and use it in an imageview but the images Im dealing with are only 128X256 and Id like to expand them to about 512X1024.

Upvotes: 2

Views: 6933

Answers (4)

Panini Luncher
Panini Luncher

Reputation: 649

The functionality to scale image up or down is readily available via android.graphics library:

Bitmap bitmapScaled = Bitmap.createScaledBitmap(Bitmap bitmapOrig, int widthNew, int heightNew, boolean filter);

Upvotes: 0

Jave
Jave

Reputation: 31846

If you want to scale the Bitmap manually, there is a Bitmap.createScaledBitmap() method that you can use for this.
If you want the ImageView to handle this, you have to set the layout_width/layout_height to something other than wrap_content or it will always shrink to the size of the Bitmap. Then you need to change the scaleType attribute to a type that actually scales the bitmap.

Upvotes: 0

Raghu Nagaraju
Raghu Nagaraju

Reputation: 3288

Use matrix to resize the bitmap.

Check this Resize Bitmap

Upvotes: 2

Nermeen
Nermeen

Reputation: 15973

Try using this method:

public static Bitmap scaleBitmap(Bitmap bitmapToScale, float newWidth, float newHeight) {   
if(bitmapToScale == null)
    return null;
//get the original width and height
int width = bitmapToScale.getWidth();
int height = bitmapToScale.getHeight();
// create a matrix for the manipulation
Matrix matrix = new Matrix();

// resize the bit map
matrix.postScale(newWidth / width, newHeight / height);

// recreate the new Bitmap and set it back
return Bitmap.createBitmap(bitmapToScale, 0, 0, bitmapToScale.getWidth(), bitmapToScale.getHeight(), matrix, true);  }

refer to my answer in: ImageView OutofMemoryException

Upvotes: 6

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