How should I give images rounded corners in Android?

by

For a more controlled method draw a rounded rectangle and mask it onto your image using the porter-duff Xfer mode of the paint.

First setup the Xfer paint and the rounded bitmap:

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:

Bitmap result = Bitmap.createBitmap(myCoolBitmap.getWidth(), myCoolBitmap.getHeight() ,Bitmap.Config.ARGB_8888);
Canvas resultCanvas = new Canvas(result)
resultCanvas.drawBitmap(myCoolBitmap, 0, 0, null);
resultCanvas.drawBitmap(rounder, 0, 0, xferPaint);

Bitmap with rounded corners now resides in result.

More Related Contents:

  1. How to add image in a TextView text?
  2. How to set android lock screen image
  3. How to select and crop an image in android?
  4. how to save bitmap to android gallery
  5. Android post picture to Facebook wall
  6. How to save an image in Android Q using MediaStore?
  7. Convert base64 string to Image in Java
  8. Android drawable speech bubble
  9. Preload multiple images with Glide
  10. Image Orientation – Android
  11. BitmapFactory.decodeStream returning null when options are set
  12. Select multiple images from Photo Gallery on Android using Intents
  13. Read an Image/file from External storage Android
  14. How to display multiple Tiles dynamically Android
  15. How to retrieve and display images from a database in a JSP page?
  16. FirebaseListAdapter not pushing individual items for chat app – Firebase-Ui 3.1
  17. Is it legal to call the start method twice on the same Thread?
  18. Gson – convert from Json to a typed ArrayList
  19. How to create a BKS (BouncyCastle) format Java Keystore that contains a client certificate chain
  20. How to download older google play services?
  21. org.json.JSONArray cannot be converted to JSONObject
  22. JSON parsing to Java – Android application
  23. Is it possible to change the text color in a string to multiple colors in Java?
  24. Reading a Json Array in android
  25. ImageIO.read returns NULL, with no errors
  26. java.lang.VerifyError: Verifier rejected class on Lollipop when using release APK
  27. Record phone calls on android phone?
  28. Creating LinearLayout Programmatically/Dynamically with Multiple Views
  29. Run Handler messages in a background thread
  30. Android’s HttpURLConnection throws EOFException on HEAD requests

Leave a Comment