How to combine two Bitmap in Android

This blog is about how to combine 2 images in Android programatically.

Note: -For this blog I am creating Bitmap instance from drawables. You can get from Camera/web APIs etc.

 1. Create 2 Bitmap instance from Drawable.

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Bitmap image1 = BitmapFactory.decodeResource(getResources(), R.drawable.image_one); Bitmap image2 = BitmapFactory.decodeResource(getResources(), R.drawable.image_two);

2. Create methods combineBitmap with 2 arguments with type of Bitmap and return type is also Bitmap.

1	public Bitmap combineImages(Bitmap bitmap1, Bitmap bitmap2){}

3. Create new instance of bitmap with bitmap2.

1	Bitmap bit1 = Bitmap.createBitmap(bitmap2, 0, 0, bitmap2.getWidth(), bitmap2.getHeight(), null, true);

4. Create new Instance of Bitmap with bitmap1 which height is equals to height of bitmap1 and bitmap2.

1	Bitmap cs = Bitmap.createBitmap(bitmap1.getWidth(), bitmap1.getHeight() +bitmap2.getHeight(), Bitmap.Config.ARGB_8888);

5. Create a canvas object.

1	Canvas comboImage = new Canvas(cs);

6. Draw bitmap1 to canvas.

1	comboImage.drawBitmap(bitmap1, 0.0f, 0.0f, null);

7. Draw second bitmap to canvas.which has margin to is height of bitmap1.

1	comboImage.drawBitmap(bit1, 0.0f, (float) bitmap1.getHeight(), null);

8. Return cs bitmap object.

1	return cs;

9. Full code of combineImage() is below.

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public Bitmap combineImages(Bitmap bitmap1, Bitmap bitmap2) { Bitmap bit1 = Bitmap.createBitmap(bitmap2, 0, 0, bitmap2.getWidth(), bitmap2.getHeight(), null, true); Bitmap cs = Bitmap.createBitmap(bitmap1.getWidth(), bitmap1.getHeight() +bitmap2.getHeight(), Bitmap.Config.ARGB_8888); Canvas comboImage = new Canvas(cs); comboImage.drawBitmap(bitmap1, 0.0f, 0.0f, null); comboImage.drawBitmap(bit1, 0.0f, (float) bitmap1.getHeight(), null); return cs; }

This method return you combined bitmap object.

Happy Coding :D