Question

      public static Bitmap getRoundedShape(Bitmap scaleBitmapImage,int width) {
    int targetWidth = width;
    int targetHeight = width;
    Bitmap targetBitmap = Bitmap.createBitmap(targetWidth, 
                        targetHeight,Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(targetBitmap);
    Path path = new Path();
    path.addCircle(((float) targetWidth - 1) / 2,
        ((float) targetHeight - 1) / 2,
        (Math.min(((float) targetWidth), 
        ((float) targetHeight)) / 2),
        Path.Direction.CCW);
    canvas.clipPath(path);
    Bitmap sourceBitmap = scaleBitmapImage;
    canvas.drawBitmap(sourceBitmap, 
        new Rect(0, 0, sourceBitmap.getWidth(),
        sourceBitmap.getHeight()), 
        new Rect(0, 0, targetWidth, targetHeight), null);
    return targetBitmap;
}

我这样做是为了获得圆形图像视图，如何在其周围添加圆形边框，如图http://i.stack.imgur.com/x8PhM.png

Answer 1

关于此功能有一篇非常有趣的帖子： http://www.curious-creature.org/2012/12/11/android-recipe-1-image-with-rounded-corners/ 它由Romain Guy（谷歌的前Android团队）撰写。

您可以使用以下内容：此示例创建一个圆形位图，周围有一个白色笔划。您可以更改它，添加带黑线的白色笔划。

public class CircleDrawable extends Drawable {

    private final BitmapShader mBitmapShader;
    private final Paint mPaint;
    private Paint mWhitePaint;
    int circleCenterX;
    int circleCenterY;
    int mRadus;
    private boolean mUseStroke = false;
    private int mStrokePadding = 0;

    public CircleDrawable(Bitmap bitmap) {

        mBitmapShader = new BitmapShader(bitmap,
                Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);

        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setShader(mBitmapShader);

    }

    public CircleDrawable(Bitmap bitmap, boolean mUseStroke) {
        this(bitmap);

        if (mUseStroke) {
            this.mUseStroke = true;
            mStrokePadding = 4;
            mWhitePaint = new Paint();
            mWhitePaint.setStyle(Paint.Style.FILL_AND_STROKE);
            mWhitePaint.setStrokeWidth(0.75f);
            mWhitePaint.setColor(Color.WHITE);
        }
    }

    @Override
    protected void onBoundsChange(Rect bounds) {
        super.onBoundsChange(bounds);
        circleCenterX = bounds.width() / 2;
        circleCenterY = bounds.height() / 2;

        if (bounds.width() >= bounds.height())
            mRadus = bounds.width() / 2;
        else
            mRadus = bounds.height() / 2;
    }

    @Override
    public void draw(Canvas canvas) {
        if (mUseStroke) {
            canvas.drawCircle(circleCenterX, circleCenterY, mRadus, mWhitePaint);
        }
        canvas.drawCircle(circleCenterX, circleCenterY, mRadus - mStrokePadding, mPaint);
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }

    @Override
    public void setAlpha(int alpha) {
        mPaint.setAlpha(alpha);
    }

    @Override
    public void setColorFilter(ColorFilter cf) {
        mPaint.setColorFilter(cf);
    }

    public boolean ismUseStroke() {
        return mUseStroke;
    }

    public void setmUseStroke(boolean mUseStroke) {
        this.mUseStroke = mUseStroke;
    }

}

Android圆形边框周围的圆形图像

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