我制作了这个自定义可绘制对象,它应该将任何可绘制对象剪成圆形。但是在我的实现中,传递的可绘制对象是原始形式的输出,而不是圆形形式的输出。
public class CircularDrawable extends Drawable {
Paint mPaint,xfermodePaint;
Drawable mDrawable;
int[] vinylCenter = new int[2];
int radius;
Bitmap src;
PorterDuffXfermode xfermode;
Rect rect;
Canvas testCanvas;
public CircularDrawable(Drawable drawable) {
mDrawable = drawable;
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setColor(0xffffffff);
mPaint.setStyle(Paint.Style.FILL);
xfermodePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
xfermode=new PorterDuffXfermode(PorterDuff.Mode.SRC_IN);
xfermodePaint.setXfermode(xfermode);
testCanvas=new Canvas();
}
@Override
public void setBounds(Rect bounds) {
super.setBounds(bounds);
mDrawable.setBounds(bounds);
}
@Override
public void setBounds(int left, int top, int right, int bottom) {
super.setBounds(left, top, right, bottom);
mDrawable.setBounds(left, top, right, bottom);
}
@Override
protected void onBoundsChange(Rect bounds) {
super.onBoundsChange(bounds);
vinylCenter[0] = bounds.width() / 2;
vinylCenter[1] = bounds.height() / 2;
radius = (bounds.right - bounds.left) / 2;
src = Bitmap.createBitmap(bounds.width(), bounds.height(), Bitmap.Config.ARGB_8888);
testCanvas.setBitmap(src);
}
@Override
public void draw(Canvas canvas) {
canvas.save();
canvas.drawARGB(0, 0, 0, 0);
canvas.drawCircle(vinylCenter[0],vinylCenter[1],radius,mPaint);
mDrawable.draw(testCanvas);
canvas.drawBitmap(src,0f,0f,xfermodePaint);
}
@Override
public void setAlpha(int alpha) {/*ignored*/}
@Override
public void setColorFilter(ColorFilter colorFilter) {/*ignored*/}
@Override
public int getOpacity() {
/*ignored*/
return 0;
}
}
我的错误是什么?
此外,我正在使用 SquareImageview 来显示这个仅在 onMeasure 中使视图呈正方形的可绘制对象。这个问题不适用于圆形图像视图。