android.graphics中提供了有关Gradient类，包含LinearGradient线性渐变、 RadialGradient径向渐变和SweepGradient梯度渐变，它们的继承自android.graphics.Shader。xYj28资讯网——每日最新资讯28at.com

LinearGradient 线性渐变

LinearGradient(float x0, float y0, float x1, float y1, int[] colors, float[] positions, Shader.TileMode tile)LinearGradient(float x0, float y0, float x1, float y1, int color0, int color1, Shader.TileMode tile)

Paint paint =new Paint();//两个坐标形成变量，规定了渐变的方向和间距大小，着色器为镜像LinearGradient linearGradient =new LinearGradient(0,0,200,0, Color.RED,Color.BLUE, Shader.TileMode.MIRROR);paint.setShader(linearGradient);paint.setStrokeWidth(50);canvas.drawLine(0,getMeasuredHeight()/2,getMeasuredWidth(),getMeasuredHeight()/2, paint);

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RadialGradient 径向/放射渐变

RadialGradient(float x, float y, float radius, int[] colors, float[] positions, Shader.TileMode tile)RadialGradient(float x, float y, float radius, int color0, int color1, Shader.TileMode tile)

paint =new Paint();radialGradient =new RadialGradient(240,360,200, new int[]{Color.BLUE, Color.GREEN, Color.RED },null, Shader.TileMode.CLAMP);paint.setShader(radialGradient);canvas.drawCircle(240,360,200,paint);

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SweepGradient 扫描/梯度/扇形渐变

SweepGradient(float x, float y, int[] colors, float[] positions)SweepGradient(float x, float y, int color0, int color1)

paint =new Paint();int[] colors = new int[]{Color.GREEN, Color.GREEN, Color.BLUE, Color.RED, Color.RED};sweepGradient = new SweepGradient(240, 360,colors,null);paint.setShader(sweepGradient);canvas.drawCircle(x,y,200,paint);

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