代码实现==》

package com.example.mypath;

import android.os.Bundle;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.ComposePathEffect;

import android.graphics.CornerPathEffect;

import android.graphics.DashPathEffect;

import android.graphics.DiscretePathEffect;

import android.graphics.Paint;

import android.graphics.Path;

import android.graphics.PathDashPathEffect;

import android.graphics.PathEffect;

import android.graphics.SumPathEffect;

import android.view.Menu;

import android.view.View;

public class MainActivity extends Activity

{

	@Override

	protected void onCreate(Bundle savedInstanceState)

	{

		super.onCreate(savedInstanceState);

		setContentView(new MyView(this));

	}

	class MyView extends View

	{

		float phase;

		PathEffect[] effects = new PathEffect[7];

		int[] colors;

		private Paint paint;

		Path path;

		public MyView(Context context)

		{

			super(context);

			paint = new Paint();

			paint.setStyle(Paint.Style.STROKE);

			paint.setStrokeWidth(10);

			// 创建并初始化Path

			path = new Path();

			path.moveTo(0, 0);

			for (int i = 0; i <= 15; i++)

			{

				// 生成15个点，随记生成他们的Y坐标,并将它们连成一条Path

				path.lineTo(i * 30, (float) Math.random() * 100);

			}

			// 初始化7个颜色

			colors = new int[] { Color.BLACK, Color.YELLOW, Color.GRAY, Color.GREEN, Color.BLUE,

					Color.RED, Color.CYAN };

		}

		@SuppressLint("DrawAllocation")

		@Override

		protected void onDraw(Canvas canvas)

		{

			// 将背景色填充为白色

			canvas.drawColor(Color.WHITE);

			// 初始化7种路径效果

			effects[0] = null;// 不使用路径效果

			effects[1] = new CornerPathEffect(10);// 使用CornerPathEffect路径效果

			effects[2] = new DiscretePathEffect(3.0f, 5.0f);// 初始化DiscretePathEffect

			effects[3] = new DashPathEffect(new float[] { 20, 10, 5, 10 }, phase);// 初始化DashPathEffect

			Path p = new Path();

			p.addRect(0, 0, 8, 8, Path.Direction.CCW);

			effects[4] = new PathDashPathEffect(p, 123, phase, PathDashPathEffect.Style.ROTATE);// 初始化PathDashPathEffect

			effects[5] = new ComposePathEffect(effects[2], effects[4]);// 初始化ComposePathEffect

			effects[6] = new SumPathEffect(effects[4], effects[3]);// 初始化SumPathEffect

			// 依次使用7种不同效果路径、7种不同的颜色来绘制路径

			for (int j = 0; j < effects.length; j++)

			{

				paint.setPathEffect(effects[j]);

				paint.setColor(colors[j]);

				canvas.drawPath(path, paint);

				canvas.translate(0, 120);

			}

			// 改变phase值，形成动画效果

			phase++;

			invalidate();

		}

	}

	@Override

	public boolean onCreateOptionsMenu(Menu menu)

	{

		// Inflate the menu; this adds items to the action bar if it is present.

		getMenuInflater().inflate(R.menu.main, menu);

		return true;

	}

}