【实例简介】
Android应用源码酒店在线预定app项目全套
【实例截图】
【核心代码】
package com.bn.summer;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Message;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class WelcomeView extends SurfaceView
implements SurfaceHolder.Callback //实现生命周期回调接口
{
MainActivity activity;//activity的引用
Paint paint; //画笔
int currentAlpha=0; //当前的不透明值
int screenWidth=320; //屏幕宽度
int screenHeight=480; //屏幕高度
int sleepSpan=50; //动画的时延ms
Bitmap[] logos=new Bitmap[2];//logo图片数组
Bitmap currentLogo; //当前logo图片引用
int currentX; //图片位置
int currentY;
public WelcomeView(MainActivity activity)
{
super(activity);
this.activity = activity;
this.getHolder().addCallback(this); //设置生命周期回调接口的实现者
paint = new Paint(); //创建画笔
paint.setAntiAlias(true); //打开抗锯齿
//加载图片
logos[0]=BitmapFactory.decodeResource(activity.getResources(), R.drawable.baina);
logos[1]=BitmapFactory.decodeResource(activity.getResources(), R.drawable.bnkjs);
}
public void onDraw(Canvas canvas)
{
//绘制黑填充矩形清背景
paint.setColor(Color.BLACK);//设置画笔颜色
paint.setAlpha(255);//设置不透明度为255
canvas.drawRect(0, 0, screenWidth, screenHeight, paint);
//进行平面贴图
if(currentLogo==null)return;
paint.setAlpha(currentAlpha);
canvas.drawBitmap(currentLogo, currentX, currentY, paint);
}
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3)
{
}
public void surfaceCreated(SurfaceHolder holder) //创建时被调用
{
new Thread()
{
public void run()
{
for(Bitmap bm:logos)
{
currentLogo=bm;//当前图片的引用
currentX=screenWidth/2-bm.getWidth()/2;//图片位置
currentY=screenHeight/2-bm.getHeight()/2;
for(int i=255;i>-10;i=i-10)
{//动态更改图片的透明度值并不断重绘
currentAlpha=i;
if(currentAlpha<0)//如果当前不透明度小于零
{
currentAlpha=0;//将不透明度置为零
}
SurfaceHolder myholder=WelcomeView.this.getHolder();//获取回调接口
Canvas canvas = myholder.lockCanvas();//获取画布
try{
synchronized(myholder)//同步
{
onDraw(canvas);//进行绘制绘制
}
}
catch(Exception e)
{
e.printStackTrace();
}
finally
{
if(canvas!= null)//如果当前画布不为空
{
myholder.unlockCanvasAndPost(canvas);//解锁画布
}
}
try
{
if(i==255)//若是新图片，多等待一会
{
Thread.sleep(1000);
}
Thread.sleep(sleepSpan);
}
catch(Exception e)//抛出异常
{
e.printStackTrace();
}
}
}
Message msg=new Message();
msg.what=Constant.GOTOLOGIN;
activity.hd.sendMessage(msg);//发送消息，开始加载棋子模型
}
}.start();
}
public void surfaceDestroyed(SurfaceHolder arg0)
{//销毁时被调用
}
}
