Develop Reference

Drawing a canvas into a bitmap

I want to save the canvas in a bitmap so I could draw that bitmap on other canvas.
the problem is that i dont know how to set the bitmap size to be the whole canvas(not the whole screen, the size of a layout of mine)
how do i set the bitmap size? and then how do i save my canvas on it?
Thanks for the help :D

I use this procedure and you can set the width and height of your view instead of bitmap.getWidth() and bitmap.getHeight() as here I am overriding a bitmap
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = pixels;
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
Hope this helps :)

imageview in android resolution [duplicate]

This question already has answers here:
How to make an ImageView with rounded corners?
(58 answers)
How to create a circular ImageView in Android? [duplicate]
(1 answer)
Closed 9 years ago.
i would like to know how to view the image in a circle view ?! like the imageview in instagram or like the other applications that can be put an imageview . In fact i would like to control by display the image in a circle or square .

Just check the below code
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
bitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = 12;
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}

please refer to this answer here
and please five me some feedback
Hope that Helps .

Animation for converting Circular image to Rounded corner in android

I have an image with circular shape,I want to apply an animation for Circular image,so that it should slowly convert into little bigger size rounded corner image.
I tried for converting circular image to rounded corner but could not able to write an animation like effect.
This makes me to convert image into rounded rectangle,but I wants the Animation for this
kind of performance.My animation should slowly convert my circular image to rectangle with rounded corners and also increase in size
public Bitmap getRoundedRectBitmap(Bitmap bitmap, int pixels)
{
result = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
canvas = new Canvas(result);
color = 0xff424242;
paint = new Paint();
rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
rectF = new RectF(rect);
roundPx = pixels;
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return result;
}

How do I round a button programmatically in Android?

I have a Button which populates a GridView using a custom adapter's call to getView(). As such, there is no .xml file for the Button.
Is there a way to programmatically round the Button?

Use a nine patch, here is an example one:
save this in your /res/drawable-mdpi/ directory with the filename btn_round.9.png
then in your java code do this:
mBtn.setBackgroundResource(R.drawable.btn_round);
because it is 9 patch wit will stretch to fit whatever content you are putting inside the button. Search for "android draw9patch" to learn more about how to create the 9 patch files.

Below given method returns rounded bitmap of image.Apply it to button image and check if this can help
public Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = pixels;
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}

Use an XML drawable background with corners and use setBackground. See How to make the corners of a button round?
You can use this even though the button itself isn't defined in xml, you're just declaring the background as an xml file.

Changing Image as Rounded Corner

I've one listview with some items. In my listview i've using custom adapter for displaying the items with images. My images in items are coming from JSON My images are like this -
Now, I just need the image with rounded corner. How do i achieve this?

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
bitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = 12;
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
code extracted from http://ruibm.com/?p=184

Bitmap myCoolBitmap = ... ; // <-- Your bitmap you want rounded
int w = myCoolBitmap.getWidth(), h = myCoolBitmap.getHeight();
We have to make sure our rounded corners have an alpha channel in most cases
Bitmap rounder = Bitmap.createBitmap(w,h,Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(rounder);
We're going to apply this paint eventually using a porter-duff xfer mode.
This will allow us to only overwrite certain pixels. RED is arbitrary. This could be any color that was fully opaque (alpha = 255)
Paint xferPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
xferPaint.setColor(Color.RED);
We're just reusing xferPaint to paint a normal looking rounded box, the 20.f is the amount we're rounding by.
canvas.drawRoundRect(new RectF(0,0,w,h), 20.0f, 20.0f, xferPaint);
Now we apply the 'magic sauce' to the paint
xferPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
Now apply this bitmap ontop of your image:
canvas.drawBitmap(myCoolBitmap, 0,0, null);
canvas.drawBitmap(rounder, 0, 0, xferPaint);

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = pixels;
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}

Check out this previous thread, brilliant answer on how to get rounded edges for bitmap images.