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超简洁代码实现CircleImageView
效果图:
页面代码:
public class CircleView extends ImageView {
private Paint mPaint = new Paint();
public CircleView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onDraw(Canvas canvas) {
Drawable mDrawable = getDrawable();//获取xml文件设置的图片
if (null == mDrawable) super.onDraw(canvas);//假设为空,交给父类处理
Bitmap mBitmap = ((BitmapDrawable) mDrawable).getBitmap();//将图片转化成bitmap
int len = getWidth() < getHeight() ? getWidth() : getHeight();//获取xml的长宽属性值,选择较小的
Bitmap tempBitmap = Bitmap.createBitmap(len, len, Bitmap.Config.ARGB_8888);//新建一个bitmap对象。作为缓存
Canvas mCanvas = new Canvas(tempBitmap);//新建画布缓存bitmap对象
mPaint.setAntiAlias(true);//抗锯齿
mCanvas.drawCircle(len / 2, len / 2, len / 2, mPaint);//画一个圆
mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));//设置画笔的覆盖类型
Matrix matrix = new Matrix(); // 初始化Matrix对象
matrix.setScale((float) len / mBitmap.getWidth(), (float) len / mBitmap.getHeight()); //设置缩放比例
mCanvas.drawBitmap(mBitmap, matrix, mPaint);//画出缩放后的图片
mPaint.reset();//重置画笔
canvas.drawBitmap(tempBitmap, 0, 0, mPaint);//绘制缓存图片
}
}
超简洁代码实现CircleImageView