Android 色彩渲染(五) LinearGradient线性渲染

Android 颜色渲染(五) LinearGradient线性渲染

Android 颜色处理(五) LinearGradient线性渲染

        相信很多人都看过歌词同步的效果, 一是竖直方向的滚动，另一方面是水平方面的歌词颜色渐变点亮效果,这种效果怎么做呢? 这就需要用到LinearGradient线性渲染,下面还是先看具体的使用:

LinearGradient有两个构造函数;

然后看一下具体怎么实现这种效果;

MainActivity:

package com.tony.shader;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.LinearGradient;import android.graphics.Paint;import android.util.AttributeSet;import android.graphics.Shader;import android.view.View;public class LinearGradientView extends View {private LinearGradient linearGradient = null;      private Paint paint = null;      public LinearGradientView(Context context)      {          super(context);          linearGradient = new LinearGradient(0, 0, 100, 100, new int[] {                  Color.YELLOW, Color.GREEN, Color.TRANSPARENT, Color.WHITE }, null,                  Shader.TileMode.REPEAT);          paint = new Paint();      }      public LinearGradientView(Context context, AttributeSet attrs) {super(context, attrs);}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);//设置渲染器paint.setShader(linearGradient);                  //绘制圆环canvas.drawCircle(240, 360, 200, paint); }}