Android的圆形边框圆形图像

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; 
} 

我这样做是为了得到一个圆形的ImageView，我怎么能添加了一圈边框周围喜欢这幅画http://i.stack.imgur.com/x8PhM.png

Answer 1

有一个很有趣的帖子这个功能： http://www.curious-creature.org/2012/12/11/android-recipe-1-image-with-rounded-corners/ 它由Romain Guy（来自Google的Android团队）编写。

你可以使用像这样的东西： 这个例子创建一个圆形的位图，大约白色的笔画。 你可以改变它，添加一个黑色线条的白色笔画。

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; 
    } 

}