圓形頭像

Android源生提供的Image都是方塊的,就算你的背景圖是個圓形默認還是在一個透明方圖之上.所以要圓形必須自定義

下面是在某大俠博客看到的,因爲時間過太久纔來整理忘了他博客的鏈接!抱歉了!!!

1:

public abstract class MaskedImage extends ImageView{
	private static final Xfermode MASK_XFERMODE;  
    private Bitmap mask;  
    private Paint paint;  
  
    static {  
        PorterDuff.Mode localMode = PorterDuff.Mode.DST_IN;  
        MASK_XFERMODE = new PorterDuffXfermode(localMode);  
    }  
  
    public MaskedImage(Context paramContext) {  
        super(paramContext);  
    }  
  
    public MaskedImage(Context paramContext, AttributeSet paramAttributeSet) {  
        super(paramContext, paramAttributeSet);  
    }  
  
    public MaskedImage(Context paramContext, AttributeSet paramAttributeSet, int paramInt) {  
        super(paramContext, paramAttributeSet, paramInt);  
    }  
  
    public abstract Bitmap createMask();  
  
    protected void onDraw(Canvas paramCanvas) {  
        Drawable localDrawable = getDrawable();  
        if (localDrawable == null)  
            return;  
        try {  
            if (this.paint == null) {  
                Paint localPaint1 = new Paint();  
                this.paint = localPaint1;  
                this.paint.setFilterBitmap(false);  
                Paint localPaint2 = this.paint;  
                Xfermode localXfermode1 = MASK_XFERMODE;  
                @SuppressWarnings("unused")  
                Xfermode localXfermode2 = localPaint2.setXfermode(localXfermode1);  
            }  
            float f1 = getWidth();  
            float f2 = getHeight();  
            int i = paramCanvas.saveLayer(0.0F, 0.0F, f1, f2, null, 31);  
            int j = getWidth();  
            int k = getHeight();  
            localDrawable.setBounds(0, 0, j, k);  
            localDrawable.draw(paramCanvas);  
            if ((this.mask == null) || (this.mask.isRecycled())) {  
                Bitmap localBitmap1 = createMask();  
                this.mask = localBitmap1;  
            }  
            Bitmap localBitmap2 = this.mask;  
            Paint localPaint3 = this.paint;  
            paramCanvas.drawBitmap(localBitmap2, 0.0F, 0.0F, localPaint3);  
            paramCanvas.restoreToCount(i);  
            return;  
        } catch (Exception localException) {  
            StringBuilder localStringBuilder = new StringBuilder()  
                    .append("Attempting to draw with recycled bitmap. View ID = ");  
            System.out.println("localStringBuilder=="+localStringBuilder);  
        }  
    } 
}

2:

public class CircularImage extends MaskedImage {
	public CircularImage(Context paramContext) {  
        super(paramContext);  
    }  
  
    public CircularImage(Context paramContext, AttributeSet paramAttributeSet) {  
        super(paramContext, paramAttributeSet);  
    }  
  
    public CircularImage(Context paramContext, AttributeSet paramAttributeSet, int paramInt) {  
        super(paramContext, paramAttributeSet, paramInt);  
    }  
  
    public Bitmap createMask() {  
        int i = getWidth();  
        int j = getHeight();  
        Bitmap.Config localConfig = Bitmap.Config.ARGB_8888;  
        Bitmap localBitmap = Bitmap.createBitmap(i, j, localConfig);  
        Canvas localCanvas = new Canvas(localBitmap);  
        Paint localPaint = new Paint(1);  
        localPaint.setColor(-16777216);  
        float f1 = getWidth();  
        float f2 = getHeight();  
        RectF localRectF = new RectF(0.0F, 0.0F, f1, f2);  
        localCanvas.drawOval(localRectF, localPaint);  
        return localBitmap;  
    }  
}

3:直接在佈局文件就可以使用了