试试这个：
import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Path;import android.graphics.Region;import android.util.AttributeSet;import android.view.View;public class HexagonMaskView extends View { private Path hexagonPath; private Path hexagonBorderPath; private float radius; private float width, height; private int maskColor;public HexagonMaskView(Context context) { super(context); init();}public HexagonMaskView(Context context, AttributeSet attrs) { super(context, attrs); init();}public HexagonMaskView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init();}private void init() { hexagonPath = new Path(); hexagonBorderPath = new Path(); maskColor = 0xFF01FF77;}public void setRadius(float r) { this.radius = r; calculatePath();}public void setMaskColor(int color) { this.maskColor = color; invalidate();}private void calculatePath() { float triangleHeight = (float) (Math.sqrt(3) * radius / 2); float centerX = width/2; float centerY = height/2; hexagonPath.moveTo(centerX, centerY + radius); hexagonPath.lineTo(centerX - triangleHeight, centerY + radius/2); hexagonPath.lineTo(centerX - triangleHeight, centerY - radius/2); hexagonPath.lineTo(centerX, centerY - radius); hexagonPath.lineTo(centerX + triangleHeight, centerY - radius/2); hexagonPath.lineTo(centerX + triangleHeight, centerY + radius/2); hexagonPath.moveTo(centerX, centerY + radius); float radiusBorder = radius - 5; float triangleBorderHeight = (float) (Math.sqrt(3) * radiusBorder / 2); hexagonBorderPath.moveTo(centerX, centerY + radiusBorder); hexagonBorderPath.lineTo(centerX - triangleBorderHeight, centerY + radiusBorder/2); hexagonBorderPath.lineTo(centerX - triangleBorderHeight, centerY - radiusBorder/2); hexagonBorderPath.lineTo(centerX, centerY - radiusBorder); hexagonBorderPath.lineTo(centerX + triangleBorderHeight, centerY - radiusBorder/2); hexagonBorderPath.lineTo(centerX + triangleBorderHeight, centerY + radiusBorder/2); hexagonBorderPath.moveTo(centerX, centerY + radiusBorder); invalidate();}@Overridepublic void onDraw(Canvas c){ super.onDraw(c); c.clipPath(hexagonBorderPath, Region.Op.DIFFERENCE); c.drawColor(Color.WHITE); c.save(); c.clipPath(hexagonPath, Region.Op.DIFFERENCE); c.drawColor(maskColor); c.save();}// getting the view size and default radius@Overridepublic void onMeasure(int widthMeasureSpec, int heightMeasureSpec){ super.onMeasure(widthMeasureSpec, heightMeasureSpec); width = MeasureSpec.getSize(widthMeasureSpec); height = MeasureSpec.getSize(heightMeasureSpec); radius = height / 2 - 10; calculatePath();}}
