drawRect:矩形

drawCircle:绘制圆形

drawOval:椭圆

drawPath:任意多边形

drawLine:直线

drawPoint:绘制点

代码示例

第一种

package com.example.examples_05_05;

import android.annotation.SuppressLint;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Path;

import android.graphics.Rect;

import android.graphics.RectF;

import android.view.View;

@SuppressLint("DrawAllocation")

public class GameView extends View implements Runnable {

Paint mpaint;//声明画笔

public GameView(Context context) {

super(context);

// TODO Auto-generated constructor stub

mpaint=new Paint();//实例化对象

new Thread(this).start();//开启线程

}

public void onDraw(Canvas canvas) {

//调用两次

super.onDraw(canvas);

//设置画布为黑色的背景

canvas.drawColor(Color.BLACK);

//取消锯齿

mpaint.setAntiAlias(true);

mpaint.setStyle(Paint.Style.STROKE);

{

//定义矩形对象

Rect rect=new Rect();

//设置矩形大小

rect.left=5;

rect.right=45;

rect.top=5;

rect.bottom=25;

mpaint.setColor(Color.BLUE);

//绘制矩形

canvas.drawRect(rect, mpaint);

mpaint.setColor(Color.RED);

//绘制矩形

canvas.drawRect(50, 5, 90, 25, mpaint);

mpaint.setColor(Color.YELLOW);

//绘制圆形

canvas.drawCircle(40, 70, 30, mpaint);

//定义椭圆的对象

RectF rectF=new RectF();

//设置椭圆的大小

rectF.left=80;

rectF.right=120;

rectF.top=30;

rectF.bottom=70;

mpaint.setColor(Color.LTGRAY);

//绘制椭圆

canvas.drawOval(rectF, mpaint);

//定义多边形

Path path=new Path();

//设置多边形的点

path.moveTo(150+5, 80-50);

path.lineTo(150+45, 80-50);

path.lineTo(150+30, 120-50);

path.lineTo(150+20, 120-50);

//使这些点构成封闭的多边形

path.close();

mpaint.setColor(Color.GRAY);

//绘制多边形

canvas.drawPath(path,mpaint);

mpaint.setColor(Color.RED);

mpaint.setStrokeWidth(3);

//绘制直线

canvas.drawLine(5, 110, 315, 110, mpaint);

}

}

public void run() {

// TODO Auto-generated method stub

while (!Thread.currentThread().isInterrupted()) {

try {

Thread.sleep(100);

} catch (Exception e) {

// TODO: handle exception

Thread.currentThread().interrupt();

}

postInvalidate();

}

}

}

第二种

package com.example.examples_05_05;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Path;

import android.graphics.Rect;

import android.graphics.drawable.ShapeDrawable;

import android.graphics.drawable.shapes.OvalShape;

import android.graphics.drawable.shapes.PathShape;

import android.graphics.drawable.shapes.RectShape;

import android.view.View;

public class GameView2 extends View implements Runnable {

//声明一个ShapeDrawable对象

ShapeDrawable mShapeDrawable=null;

public GameView2(Context context) {

super(context);

// TODO Auto-generated constructor stub

}

public void onDraw(Canvas canvas) {

//实例化ShapeDrawable对象并说明是绘制一个矩形

super.onDraw(canvas);

mShapeDrawable =new ShapeDrawable(new RectShape());

//得到画笔，并设置其颜色

mShapeDrawable.getPaint().setColor(Color.RED); 

//设置矩形

Rect bounds=new Rect(5,250,55,280);

//设置图像显示区域

mShapeDrawable.setBounds(bounds);

//在画布上绘制矩形

mShapeDrawable.draw(canvas);

/*============================================================*/

//实例化ShapeDrawable对象绘制椭圆

mShapeDrawable=new ShapeDrawable(new OvalShape());

//得到画笔并设置颜色

mShapeDrawable.getPaint().setColor(Color.GREEN);

//设置显示区域

mShapeDrawable.setBounds(70,250,150,280);

//绘制图像

mShapeDrawable.draw(canvas);

Path path=new Path();

//设置多边形

path.moveTo(155, 110);

path.lineTo(195, 110);

path.lineTo(180, 150);

path.lineTo(170, 150);

//使这些点构造成封闭多边形

path.close();

//PathShape后面两个参数分别是宽和高

mShapeDrawable=new ShapeDrawable(new PathShape(path, 150, 150));

//得到画笔并设置颜色

mShapeDrawable.getPaint().setColor(Color.BLUE);

//设置图像显示区域

mShapeDrawable.setBounds(100, 170, 200, 280);

//绘制图像

mShapeDrawable.draw(canvas);

}

public void run() {

// TODO Auto-generated method stub

while (!Thread.currentThread().isInterrupted()) {

try {

Thread.sleep(100);

} catch (Exception e) {

// TODO: handle exception

Thread.currentThread().interrupt();

}

postInvalidate();

}

}

}

全部

package com.example.examples_05_05;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

public class MainActivity extends Activity {

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

       // GameView gameView=new GameView(this);

        setContentView(new GameView2(this));

    }

}