ImageView的自定义形状裁剪

要实现ImageView的自定义形状裁剪，可以通过创建一个自定义的Drawable来实现。以下是一个简单的示例代码：

1. 创建一个自定义的Drawable类，继承自Drawable类，并重写其draw()和setBounds()方法：

public class CustomShapeDrawable extends Drawable {

    private Path mPath;
    private Paint mPaint;

    public CustomShapeDrawable() {
        mPath = new Path();
        mPaint = new Paint();
        mPaint.setColor(Color.BLACK);
        mPaint.setStyle(Paint.Style.FILL);
    }

    @Override
    public void draw(Canvas canvas) {
        canvas.drawPath(mPath, mPaint);
    }

    @Override
    public void setBounds(int left, int top, int right, int bottom) {
        super.setBounds(left, top, right, bottom);
        mPath.reset();
        mPath.addCircle(getBounds().width() / 2, getBounds().height() / 2, Math.min(getBounds().width(), getBounds().height()) / 2, Path.Direction.CW);
    }

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

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

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

2. 在Activity中将自定义的Drawable设置给ImageView：

ImageView imageView = findViewById(R.id.imageView);
CustomShapeDrawable customShapeDrawable = new CustomShapeDrawable();
imageView.setImageDrawable(customShapeDrawable);

通过上述步骤，我们可以实现ImageView的自定义形状裁剪。在CustomShapeDrawable类中，我们可以根据需要定义不同的形状裁剪，如圆形、椭圆形、三角形等。