Android绘制图形（重绘方法在此可以找到）

package com.example.k.myapplication;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.graphics.Shader;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

/**
* Created by k on 2016/5/26.
*/
public class MyView extends View {
//圆形paint
Paint circularPaint;
//三角形paint
Paint trianglePaint;
//正方形paint
Paint squarePaint;
//长方形paint
Paint rectanglePaint;

public MyView(Context context, AttributeSet attr) {
super(context, attr);
//实例化Paint对象
circularPaint = new Paint();
trianglePaint = new Paint();
squarePaint = new Paint();
rectanglePaint = new Paint();
//设置画笔颜色
circularPaint.setColor(Color.DKGRAY);
trianglePaint.setColor(Color.BLUE);
squarePaint.setColor(Color.BLUE);
rectanglePaint.setColor(Color.MAGENTA);
//设置抗锯齿
circularPaint.setAntiAlias(true);
trianglePaint.setAntiAlias(true);
squarePaint.setAntiAlias(true);
rectanglePaint.setAntiAlias(true);
//设置风格
circularPaint.setStyle(Paint.Style.STROKE);//空心圆风格
trianglePaint.setStyle(Paint.Style.STROKE);
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//画圆
canvas.drawCircle(50, 100, 50, circularPaint);
//画三角形
Path path = new Path();
path.moveTo(230, 20);// 此点为多边形的起点
path.lineTo(340, 150);//左点
path.lineTo(120, 150);//右点
path.close(); // 使这些点构成封闭的多边形
canvas.drawPath(path, trianglePaint);
//画正方形,调整数据就可以画成长方形了，所以这里不再演示
//第一个和第二个参数为左上角的点坐标，三四是右下角的坐标。
canvas.drawRect(350, 20, 500, 150, squarePaint);
//画线
canvas.drawLine(100f, 100f, 300f, 300f, squarePaint);
//画点
canvas.drawPoint(100f, 170f, squarePaint);
//画扇形

// p.setColor(Color.BLUE);
//第二个和第三个参数可以设置纵坐标，第一个和第三个参数设置横坐标，前面两个参数和后面两个参数成对一起增大或减小就可以实现把圆变大或变小；
RectF oval2 = new RectF(20, 20, 50, 50);// 设置个新的长方形，扫描测量
//第二个参数为旋转扇形，第三个参数是设置扇形的饱满度，
canvas.drawArc(oval2, 110, 300, true, squarePaint);

canvas.drawText("画矩形：", 10, 80, p);//画文本

//postInvalidate();这个方法是直接重绘的

//100毫秒重绘一次postInvalidateDelayed(100);}

}以下为详细资料：出于 http://blog.csdn.net/rhljiayou/article/details/7212620 public class DrawView extends View {public DrawView(Context context) {super(context);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);/** 方法 说明 drawRect 绘制矩形 drawCircle 绘制圆形 drawOval 绘制椭圆 drawPath 绘制任意多边形* drawLine 绘制直线 drawPoin 绘制点*/// 创建画笔Paint p = new Paint();p.setColor(Color.RED);// 设置红色canvas.drawText("画圆：", 10, 20, p);// 画文本canvas.drawCircle(60, 20, 10, p);// 小圆p.setAntiAlias(true);// 设置画笔的锯齿效果。 true是去除，大家一看效果就明白了canvas.drawCircle(120, 20, 20, p);// 大圆canvas.drawText("画线及弧线：", 10, 60, p);p.setColor(Color.GREEN);// 设置绿色canvas.drawLine(60, 40, 100, 40, p);// 画线canvas.drawLine(110, 40, 190, 80, p);// 斜线//画笑脸弧线p.setStyle(Paint.Style.STROKE);//设置空心RectF oval1=new RectF(150,20,180,40);canvas.drawArc(oval1, 180, 180, false, p);//小弧形oval1.set(190, 20, 220, 40);canvas.drawArc(oval1, 180, 180, false, p);//小弧形oval1.set(160, 30, 210, 60);canvas.drawArc(oval1, 0, 180, false, p);//小弧形canvas.drawText("画矩形：", 10, 80, p);p.setColor(Color.GRAY);// 设置灰色p.setStyle(Paint.Style.FILL);//设置填满canvas.drawRect(60, 60, 80, 80, p);// 正方形canvas.drawRect(60, 90, 160, 100, p);// 长方形canvas.drawText("画扇形和椭圆:", 10, 120, p);/* 设置渐变色 这个正方形的颜色是改变的 */Shader mShader = new LinearGradient(0, 0, 100, 100,new int[] { Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW,Color.LTGRAY }, null, Shader.TileMode.REPEAT); // 一个材质,打造出一个线性梯度沿著一条线。p.setShader(mShader);// p.setColor(Color.BLUE);RectF oval2 = new RectF(60, 100, 200, 240);// 设置个新的长方形，扫描测量canvas.drawArc(oval2, 200, 130, true, p);// 画弧，第一个参数是RectF：该类是第二个参数是角度的开始，第三个参数是多少度，第四个参数是真的时候画扇形，是假的时候画弧线//画椭圆，把oval改一下oval2.set(210,100,250,130);canvas.drawOval(oval2, p);canvas.drawText("画三角形：", 10, 200, p);// 绘制这个三角形,你可以绘制任意多边形Path path = new Path();path.moveTo(80, 200);// 此点为多边形的起点path.lineTo(120, 250);path.lineTo(80, 250);path.close(); // 使这些点构成封闭的多边形canvas.drawPath(path, p);// 你可以绘制很多任意多边形，比如下面画六连形p.reset();//重置p.setColor(Color.LTGRAY);p.setStyle(Paint.Style.STROKE);//设置空心Path path1=new Path();path1.moveTo(180, 200);path1.lineTo(200, 200);path1.lineTo(210, 210);path1.lineTo(200, 220);path1.lineTo(180, 220);path1.lineTo(170, 210);path1.close();//封闭canvas.drawPath(path1, p);/** Path类封装复合(多轮廓几何图形的路径* 由直线段*、二次曲线,和三次方曲线，也可画以油画。drawPath(路径、油漆),要么已填充的或抚摸* (基于油漆的风格),或者可以用于剪断或画画的文本在路径。*///画圆角矩形p.setStyle(Paint.Style.FILL);//充满p.setColor(Color.LTGRAY);p.setAntiAlias(true);// 设置画笔的锯齿效果canvas.drawText("画圆角矩形:", 10, 260, p);RectF oval3 = new RectF(80, 260, 200, 300);// 设置个新的长方形canvas.drawRoundRect(oval3, 20, 15, p);//第二个参数是x半径，第三个参数是y半径//画贝塞尔曲线canvas.drawText("画贝塞尔曲线:", 10, 310, p);p.reset();p.setStyle(Paint.Style.STROKE);p.setColor(Color.GREEN);Path path2=new Path();path2.moveTo(100, 320);//设置Path的起点path2.quadTo(150, 310, 170, 400); //设置贝塞尔曲线的控制点坐标和终点坐标canvas.drawPath(path2, p);//画出贝塞尔曲线//画点p.setStyle(Paint.Style.FILL);canvas.drawText("画点：", 10, 390, p);canvas.drawPoint(60, 390, p);//画一个点canvas.drawPoints(new float[]{60,400,65,400,70,400}, p);//画多个点//画图片，就是贴图Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);canvas.drawBitmap(bitmap, 250,360, p);}}