Java tutorial
//package com.java2s; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.PorterDuff; import android.graphics.PorterDuffXfermode; import android.graphics.Rect; public class Main { /** * Create circle image. * * @param bitmap Bitmap to be cropped * @param resColor Resource color * @param strokeWidth Thickness of stroke * @return Returns the circle image with border */ public static Bitmap getCircleImage(Bitmap bitmap, int resColor, int strokeWidth) { // create Bitmap to draw Bitmap mBitmap = Bitmap.createBitmap(bitmap.getWidth() + 8, bitmap.getHeight() + 8, Bitmap.Config.ARGB_8888); // create Rect to hold image final Rect mRec = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); // create Canvas Canvas mCanvas = new Canvas(mBitmap); mCanvas.drawARGB(0, 0, 0, 0); // create Paint final Paint mPaint = new Paint(); mPaint.setStyle(Paint.Style.FILL); mPaint.setAntiAlias(true); // get the half size of the image int mHalfWidth = bitmap.getWidth() / 2; int mHalfHeight = bitmap.getHeight() / 2; // draw circle mCanvas.drawCircle((mHalfWidth + 4), (mHalfHeight + 4), Math.min(mHalfWidth, mHalfHeight), mPaint); // unknown mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); // draw the image mCanvas.drawBitmap(bitmap, mRec, mRec, mPaint); // set border mode mPaint.setXfermode(null); // set stroke mPaint.setStyle(Paint.Style.STROKE); // set stroke color mPaint.setColor(resColor); // set stroke width mPaint.setStrokeWidth(strokeWidth); // draw stroke mCanvas.drawCircle((mHalfWidth + 4), (mHalfHeight + 4), Math.min(mHalfWidth, mHalfHeight), mPaint); // return the circle image return mBitmap; } }