定义一个画图的接口：

package com.ken.drawable;

import android.graphics.Canvas;

public interface drawGraphics {

public void draw(Canvas canvas);

}

画圆：

package com.ken.drawable;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.RectF;

public class DrawCircle implements drawGraphics {

private Paint paint= null;

private Paint paint_eye= null;

public DrawCircle(){

paint= new Paint();

paint_eye= new Paint();

}

public void draw(Canvas canvas) {

// TODO Auto-generated method stub

//绘制圆形(圆心x，圆心y，半径r，画笔p)

paint_eye.setAntiAlias(true);

paint.setAntiAlias(true);

RectF rectF = new RectF(120,60,370,240);

paint_eye.setColor(Color.WHITE);

paint.setColor(Color.GREEN);

canvas.drawCircle(190, 110, 18, paint_eye);

canvas.drawCircle(300, 110, 18, paint_eye);

canvas.drawArc(rectF, 180, 180,true, paint);

}

}

画直线：

package com.ken.drawable;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

public class DrawLine implements drawGraphics {

private Paint paint= null;

public DrawLine(){

paint= new Paint();

}

public void draw(Canvas canvas) {

// TODO Auto-generated method stub

paint.setAntiAlias(true);

//绘制直线

paint.setColor(Color.GREEN);

//设置线条粗细

paint.setStrokeWidth(12);

canvas.drawLine(120,40,170,90, paint);

canvas.drawLine(320,90,370,40, paint);

}

}

画矩形：

package com.ken.drawable;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.RectF;

public class DrawRect implements drawGraphics {

private Paint paint= null;

public DrawRect(){

paint= new Paint();

}

public void draw(Canvas canvas) {

// TODO Auto-generated method stub

//定义圆角矩形对象

RectF rectF1 = new RectF(120,170,370,500);

RectF rectF2 = new RectF(40,150,90,400);

RectF rectF3 = new RectF(390,150,440,400);

RectF rectF4 = new RectF(140,520,200,650);

RectF rectF5 = new RectF(290,520,350,650);

paint.setAntiAlias(true);

//设置画笔颜色为BLUE

paint.setColor(Color.GREEN);

//在画布上绘制圆角矩形/圆弧/直线

canvas.drawRoundRect(rectF1, 20, 20, paint);

canvas.drawRoundRect(rectF2, 20, 20, paint);

canvas.drawRoundRect(rectF3, 20, 20, paint);

canvas.drawRoundRect(rectF4, 20, 20, paint);

canvas.drawRoundRect(rectF5, 20, 20, paint);

}

}

显示的类：

package com.ken.drawable;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.view.View;

public class GameView extends View implements Runnable {

private Paint mPaint=null;

private drawGraphics mdrawGraphics=null;

public GameView(Context context) {

super(context);

// TODO Auto-generated constructor stub

//构建对象

mPaint=new Paint();

//开启线程

new Thread(this).start();

}

public void onDraw(Canvas canvas){

super.onDraw(canvas);

//设置画布为黑色

//canvas.drawColor(Color.BLACK);

//消除锯齿

mPaint.setAntiAlias(true);

//设置图形为空心

mPaint.setStyle(Paint.Style.STROKE);

//绘制空心几何图形

mdrawGraphics=new DrawCircle();

mdrawGraphics.draw(canvas);

mdrawGraphics=new DrawLine();

mdrawGraphics.draw(canvas);

mdrawGraphics=new DrawRect();

mdrawGraphics.draw(canvas);

}

public void run() {

// TODO Auto-generated method stub

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

try{

Thread.sleep(1000);

} catch(InterruptedException e) {

// TODO: handle exception

Thread.currentThread().interrupt();

}

//使用postInvalidate 可以直接在线程中更新界面

postInvalidate();

}

}

}

主类：

package com.ken.drawable;

import android.app.Activity;

import android.os.Bundle;

public class GameStart extends Activity {

private GameView mGameView= null;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

this.mGameView= new GameView(this);

setContentView(mGameView);

}

}