Android新手入门实例之Android漂亮时钟的源代码

[java] view plain copy print ?

packagecom.smart.impl;
importjava.util.Calendar;
importandroid.content.Context;
importandroid.graphics.Bitmap;
importandroid.graphics.BitmapFactory;
importandroid.graphics.Canvas;
importandroid.graphics.Paint;
importandroid.graphics.Rect;
importandroid.os.Handler;
importandroid.util.AttributeSet;
importandroid.view.View;
publicclassHandClockextendsViewimplementsRunnable
{
privateintclockImageResourceId;
privateBitmapbitmap;
privatefloatscale;
privatefloathandCenterWidthScale;
privatefloathandCenterHeightScale;
privateintminuteHandSize;
privateinthourHandSize;
privateHandlerhandler=newHandler();
@Override
publicvoidrun()
{
//重新绘制View
invalidate();
//重新设置定时器，在60秒后调用run方法
handler.postDelayed(this,60*1000);
}
@Override
protectedvoidonMeasure(intwidthMeasureSpec,intheightMeasureSpec)
{
super.onMeasure(widthMeasureSpec,heightMeasureSpec);
//根据图像的实际大小等比例设置View的大小
setMeasuredDimension((int)(bitmap.getWidth()*scale),(int)(bitmap
.getHeight()*scale));
}
@Override
protectedvoidonDraw(Canvascanvas)
{
super.onDraw(canvas);
Paintpaint=newPaint();
Rectsrc=newRect();
Recttarget=newRect();
src.left=0;
src.top=0;
src.right=bitmap.getWidth();
src.bottom=bitmap.getHeight();
target.left=0;
target.top=0;
target.bottom=(int)(src.bottom*scale);
target.right=(int)(src.right*scale);
//画表盘图像
canvas.drawBitmap(bitmap,src,target,paint);
//计算表盘中心点的横纵坐标
floatcenterX=bitmap.getWidth()*scale*handCenterWidthScale;
floatcenterY=bitmap.getHeight()*scale*handCenterHeightScale;
//表表盘中心点画一个半径为5的实心圆圈
canvas.drawCircle(centerX,centerY,5,paint);
//设置分针为3个象素粗
paint.setStrokeWidth(3);
Calendarcalendar=Calendar.getInstance();
intcurrentMinute=calendar.get(Calendar.MINUTE);
intcurrentHour=calendar.get(Calendar.HOUR);
//计算分针和时间的角度
doubleminuteRadian=Math
.toRadians((360-((currentMinute*6)-90))%360);
doublehourRadian=Math.toRadians((360-((currentHour*30)-90))
%360-(30*currentMinute/60));
//在表盘上画分针
canvas.drawLine(centerX,centerY,(int)(centerX+minuteHandSize
*Math.cos(minuteRadian)),(int)(centerY-minuteHandSize
*Math.sin(minuteRadian)),paint);
//设置实针为4个象素粗
paint.setStrokeWidth(4);
//在表盘上画分针
canvas.drawLine(centerX,centerY,(int)(centerX+hourHandSize
*Math.cos(hourRadian)),(int)(centerY-hourHandSize
*Math.sin(hourRadian)),paint);
}
publicHandClock(Contextcontext,AttributeSetattrs)
{
super(context,attrs);
//读取相应的属性值
clockImageResourceId=attrs.getAttributeResourceValue(null,
"clockImageSrc",0);
if(clockImageResourceId>0)
bitmap=BitmapFactory.decodeResource(getResources(),
clockImageResourceId);
scale=attrs.getAttributeFloatValue(null,"scale",1);
handCenterWidthScale=attrs.getAttributeFloatValue(null,
"handCenterWidthScale",bitmap.getWidth()/2);
handCenterHeightScale=attrs.getAttributeFloatValue(null,
"handCenterHeightScale",bitmap.getHeight()/2);
//在读取分针和时针长度后，将其值按图像的缩放比例进行缩放
minuteHandSize=(int)(attrs.getAttributeIntValue(null,
"minuteHandSize",0)*scale);
hourHandSize=(int)(attrs.getAttributeIntValue(null,"hourHandSize",
0)*scale);
intcurrentSecond=Calendar.getInstance().get(Calendar.SECOND);
//将定时器设在0分时执行run方法
handler.postDelayed(this,(60-currentSecond)*1000);
}
@Override
protectedvoidonDetachedFromWindow()
{
super.onDetachedFromWindow();
//删除回调类
handler.removeCallbacks(this);
}}

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