Android SurfaceView概述

简介：SurfaceView继承自View，但它与View不同，View是在UI主线程中更新画面，而SurfaceView是在一个新线程中更新画面，View的特性决定了其不适合做动画，因为如果更新画面时间过长，那么UI线程就会被正在画的函数阻塞，所以Android通常用SurfaceView做动画效果。

下面给出一个使用SurfaceView做的简单例子：

package com.yw.myapiupdate.mydraw;import android.app.Activity;
import android.os.Bundle;
import android.view.Display;/*** * @author yw-tony**/
public class MyDrawActivity extends Activity{private SurfaceViewBall ball ;private int width = 0;private int height = 0;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);Display display = getWindowManager().getDefaultDisplay();width = display.getWidth();height = display.getHeight();ball = new SurfaceViewBall(this,width,height);/*ball.setOnTouchListener(new OnTouchListener() {float x = 0;float y = 0;@Overridepublic boolean onTouch(View v, MotionEvent event) {switch(event.getAction()){case MotionEvent.ACTION_DOWN://按下ball.drawThread.top += event.getY();ball.drawThread.left += event.getX();ball.drawThread.buttom += event.getY();ball.drawThread.right += event.getX();break;case MotionEvent.ACTION_MOVE://移动//基于xy为圆心移动//得到手指的坐标(x,y)x = event.getRawX();y = event.getRawY();x = ((ball.drawThread.right - ball.drawThread.left)/2);y = (ball.drawThread.buttom - ball.drawThread.top)/2;ball.drawThread.top = (int) (event.getRawY()+y);ball.drawThread.left = (int) (event.getRawX()+x);ball.drawThread.right = (int)(200+event.getX()+x);ball.drawThread.buttom = (int)(200+event.getY()+y);log.e("getRawX", ""+event.getRawX());log.e("getRawY", ""+event.getRawY());log.e("getX", ""+event.getX());log.e("getRawY", ""+event.getY());//                    ball.drawThread.top += 20;
//                    ball.drawThread.left += event.getRawX();
//                    ball.drawThread.buttom += event.getRawY();
//                    ball.drawThread.right += event.getRawX();break;case MotionEvent.ACTION_UP://弹起ball.drawThread.top += 20;ball.drawThread.buttom += 20;ball.drawThread.top += event.getRawY();ball.drawThread.left += event.getRawX();ball.drawThread.buttom += event.getRawY();ball.drawThread.right += event.getRawX();break;}return true;}});*/setContentView(ball);}/*** 屏幕触摸事件*//*@Overridepublic boolean onTouchEvent(MotionEvent event) {switch(event.getAction()){case MotionEvent.ACTION_DOWN://按下ball.drawThread.top += event.getY();ball.drawThread.left += event.getX();ball.drawThread.buttom += event.getY();ball.drawThread.right += event.getX();break;case MotionEvent.ACTION_MOVE://移动ball.drawThread.top += event.getRawY();
//            ball.drawThread.left += event.getRawX();
//            ball.drawThread.buttom += event.getRawY();
//            ball.drawThread.right += event.getRawX();break;case MotionEvent.ACTION_UP://弹起ball.drawThread.top += event.getRawY();ball.drawThread.left += event.getRawX();ball.drawThread.buttom += event.getRawY();ball.drawThread.right += event.getRawX();break;}return true;}*/@Overridepublic void onBackPressed() {ball.drawThread.isRun = false;super.onBackPressed();}
}

MySurfaceView.java

package com.yw.myapiupdate.mydraw;import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.view.SurfaceHolder;
import android.view.SurfaceView;public class SurfaceViewBall extends SurfaceView implements SurfaceHolder.Callback{private SurfaceHolder holder;public DrawThread drawThread ;private int width = 0;//屏幕宽度private int height = 0;//屏幕高度public SurfaceViewBall(Context context,int width ,int height) {super(context);holder = this.getHolder();//得到surfaceHolder对象//给holder添加回调函数holder.addCallback(this);drawThread = new DrawThread(holder);this.width = width;this.height = height;}/*** 当视图发生改变时执行*/@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {}/*** 当创建视图时执行*/@Overridepublic void surfaceCreated(SurfaceHolder holder) {drawThread.isRun = true;drawThread.start();}/*** 当视图销毁时执行*/@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {drawThread.isRun = false;}/*** 绘制图像的线程* @author yw-tony**/class DrawThread extends Thread{private SurfaceHolder drawHolder;public boolean isRun;public int top = 50;public int buttom = 250;public int left = 100;public int right = 300 ;public DrawThread(SurfaceHolder drawHolder){this.drawHolder = drawHolder;}@Overridepublic void run() {int count = 0;boolean target = false;boolean targetHeightFlag = false;while(isRun){Canvas canvas = null;try{synchronized (SurfaceViewBall.class) {canvas = drawHolder.lockCanvas();//锁定画布canvas.drawColor(Color.BLACK);//设置画布颜色//创建画笔Paint paint = new Paint();paint.setTextSize(20.00f);//设置画笔颜色为白色
                        paint.setColor(Color.WHITE);//创建矩形区域/*left = left +20;right = right + 20;*//*对矩形左右两边进行碰撞检测*/if(left <= 0){//如果碰到左边界，则向右边移动left = left +20;right = right +20;target   = false;}else if(right >= width){//如果碰到右边界则向左边移动left = left -20;right = right - 20;target = true;}else{if(target){left = left -20;right = right - 20;}else{left = left +20;right = right + 20;}}/*对矩形上下两边进行碰撞检测*/if(top<=0){//如果矩形碰到顶部top = top+10;buttom = buttom + 10;targetHeightFlag = false;}else if(buttom >= height){//如果矩形碰到底部top = top-10;buttom = buttom - 10;targetHeightFlag = true;}else{//按正常流程执行if(targetHeightFlag){top = top-10;buttom = buttom - 10;}else{top = top+10;buttom = buttom + 10;}}Rect rect = new Rect(left,top,right,buttom);//绘制矩形区域
                        canvas.drawRect(rect, paint);//绘制字体canvas.drawText("这是第"+(count++)+"秒", 100, 300, paint);//休眠时间为1秒if(canvas != null){holder.unlockCanvasAndPost(canvas);//结束画布锁定，并提交改变
                        }Thread.sleep(50);}}catch(Exception e){}finally{}}}}}

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