android自定义钟表

作者: Jack921 | 来源:发表于2016-09-11 23:56 被阅读682次

    android自定义钟表

    首先看看效果图先

    time.gif

    然后看看自定义的属性

    <resources>    
    <!--钟表整体颜色-->    
    <attr name="color" format="color"/>    
    <!--数字大小-->   
     <attr name="numSize" format="dimension"/>    
    <!--中心外圆半径-->    
    <attr name="inCircle" format="integer"/>    
    <!--中心内圆半径-->   
     <attr name="outCircle" format="integer"/>   
     <declare-styleable name="ClockView"> 
     <attr name="numSize"/>        
    <attr name="color"/>       
     <attr name="inCircle"/>        
    <attr name="outCircle"/>    
    </declare-styleable>
    </resources>
    
    在xml界面的编写
    <resources><com.example.jack.clock.widget.ClockView     android:layout_width="match_parent" android:layout_height="wrap_content"     app:color="@color/colorPrimary" app:inCircle="15" app:outCircle="25" app:numSize="18dp"/></resources>
    

    自定义各参数的初始化

     public ClockView(Context context) {  
      this(context,null);
    }
    public ClockView(Context context, AttributeSet attrs) { 
       this(context, attrs,0);
    }
    public ClockView(Context context, AttributeSet attrs, int defStyleAttr){    
    super(context, attrs, defStyleAttr);    
    display((WindowManager)getContext().getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();    screemWidth=display.getWidth();    screemHeight=display.getHeight();    
    float density=getResources().getDisplayMetrics().density;    marginLongPoint=(int)density*8;    
    maginShortPoint=(int)density*16;    
    maginRadius=(int)density*10;    
    maginText=(int)density*10;   
    hourMargin=(int)density*75;    
    minuteMargin=(int)density*40;    
    TypedArray typedArray=context.getTheme().obtainStyledAttributes(attrs,R.styleable.ClockView,defStyleAttr,0);    
    int numCount=typedArray.getIndexCount();    
    for(int i=0;i<numCount;i++){        
    int attr=typedArray.getIndex(i);        
      switch(attr){            
            case R.styleable.ClockView_numSize:                              numSize=typedArray.getDimensionPixelSize(attr,(int)TypedValue                        .applyDimension(TypedValue.COMPLEX_UNIT_SP,15,getResources().getDisplayMetrics()));                
    break;            
           case R.styleable.ClockView_color:                  color=typedArray.getColor(attr,Color.BLACK);                
    break;            
    case R.styleable.ClockView_inCircle:                
    inCircle=typedArray.getInt(attr,15);                
    break;            
    case R.styleable.ClockView_outCircle:                
    outCircle=typedArray.getInt(attr,25);                
    break;        
    }    
    }   
     typedArray.recycle();    
    initCanvas();
    }
    

    接下来就是设定这个自定义View的大小,在没有大小自适应的时候,view的高度我这位整个手机屏幕高度的三分之一,宽度为整个屏幕的宽度

     if(widthModel==MeasureSpec.EXACTLY){ width=widthSize; 
      }else{ 
      width=screemWidth; 
    } if(heightModel==MeasureSpec.EXACTLY){ 
      height=heightSize; 
    }else{
      height=screemHeight/3; 
    } 
    

    在onDraw()方法里我们就可以开始画图了

    @Override 
    protected void onDraw(Canvas canvas) { 
    //得到圆的半径 if(getWidth()>getHeight()){ 
    radius=getHeight()/2-maginRadius; 
    }else{ 
    radius=getWidth()/2-maginRadius; 
    } 
    //获得View一半的宽度和高度 
    halfWidth=getWidth()/2; 
    halfHeight=getHeight()/2; 
    //保存状态 
    canvas.save();
     //画大圆 
    canvas.drawCircle(halfWidth,halfHeight,radius,paint);
     //画中间大圆 
    canvas.drawCircle(halfWidth,halfHeight,outCircle,inCirclePaint); 
    //画中间小圆 
    canvas.drawCircle(halfWidth,halfHeight,inCircle,outCirclePaint);
     //画60个刻度和时钟数字 
    drawClockScale(canvas); 
    //绘制时间指针 
    refreshTime(canvas);
     //返回状态 
    canvas.restore(); 
    //每隔一秒刷新 postInvalidateDelayed(1000);
     }
    

    首先我们画的是外部的圆圈和正中间的半透明的大圆和小圆 ,即得到整个view的中心点也就是一半的宽(halfWidth)和高(halfHeight)画半径为radius的圆

    代码如下:

    //画大圆
    canvas.drawCircle(halfWidth,halfHeight,radius,paint);
    //画中间大圆
    canvas.drawCircle(halfWidth,halfHeight,outCircle,inCirclePaint);
    //画中间小圆
    canvas.drawCircle(halfWidth,halfHeight,inCircle,outCirclePaint);

    GIF1.gif

    接着就是要画60个刻度和时钟数字这是整个自定义的难点和重点,不说废话先贴代码:

    画60个刻度和时钟数字

     //画60个刻度 
    public void drawClockScale(Canvas canvas){ canvas.translate(halfWidth,halfHeight); canvas.save();
     //长指针的长 
    LongCalibration=radius/marginLongPoint; 
    //短指针的长 
    ShortCalibration=radius/maginShortPoint; 
    for(int i=0;i<pointNum;i++){ 
          if(i%5==0){ 
      //绘画文字 
    canvas.save();
     Rect rect=new Rect(); 
    int number=i==0?12:(i/5);
     textPaint.getTextBounds((number+""),0,(number+"").length(),rect); canvas.translate(0,-radius+LongCalibration+((rect.bottom-rect.top)/2)+maginText); 
    canvas.rotate(-6*i);
     canvas.drawText(number+"",0,(rect.bottom-rect.top)/2,textPaint); canvas.restore();
     //画线 
    canvas.drawLine(0,-radius+LongCalibration,0,-radius,paint); 
    }else{ 
    canvas.drawLine(0,-radius+ShortCalibration,0,-radius,paint); 
    } 
    canvas.rotate(6); 
    } 
    canvas.restore();
     }
    

    pointNum=60即60个指针刻度,我们先把canvas的坐标原点移动到整个View的中心即canvas.translate(halfWidth,halfHeight);接着这个圆是360度我们有60个刻度即每个刻度的旋转角度为6度,所以我们每一次循环都要把canvas旋转6度即canvas.rotate(6)。理解这个之后我们每次循环通过canvas.drawline画出刻度,其中LongCalibration是长刻度的长,而ShortCalibration就是短刻度的长,

    canvas.drawLine(0,-radius+LongCalibration,0,-radius,paint);
    
    git2.PNG

    即旋转画出X轴Y轴为(0,-radius+LongCalibration)和(0,-radius)这两点的直线。接着就是画文字了,首先Rect计算出显示的数字的大小,再把canvas的原点移动半径减去刻度的长度和数字一半大小,自定义的间隙之后的距离,此时原点的位置就是需要画出的数字的位置,canvas在旋转-6*i的距离才能使字体竖直,效果如下:

    time2.PNG

    绘制时间指针

    //获取时间指针对应的角度 
    public void refreshTime(Canvas canvas){ 
    //获取获取当前的时间 
    Calendar mCalendar=Calendar.getInstance(); 
    int tempHour=mCalendar.get(Calendar.HOUR); 
    int tempMinute=mCalendar.get(Calendar.MINUTE); 
    int tempSecond=mCalendar.get(Calendar.SECOND); 
    int hourRotate=new Float(360*((float)tempHour/12)).intValue(); 
    //计算出份指针的旋转的角度 
    int minuteRotate=new Float(360*((float)tempMinute/60)).intValue(); //计算出时指针旋转的角度,注(时的角度是当前小时的角度再加分钟所引起小时偏转的角度)
     hourRotate+=new Float(30*((float)minuteRotate/360)).intValue();
     //计算出秒指针旋转的角度 
    int secondRotate=new Float(360*((float)tempSecond/60)).intValue(); drawCircleLine(canvas,hourRotate,minuteRotate,secondRotate); 
    } 
     //时间指针 
    public void drawCircleLine(Canvas canvas,int hour,int minute,int second){
     marginLong=radius-LongCalibration-minuteMargin;  marginShort=radius-LongCalibration-hourMargin; canvas.rotate(180); 
    //画小时指针 
    RectF hourRectF=new RectF(-pointRadio,-pointRadio,pointRadio,marginShort); canvas.save(); canvas.rotate(hour); canvas.drawRoundRect(hourRectF,circular,circular,outCirclePaint); canvas.restore();
     //画分钟指针 
    RectF minuteRectF=new RectF(-pointRadio,-pointRadio,pointRadio,marginLong); canvas.save(); canvas.rotate(minute); canvas.drawRoundRect(minuteRectF,circular,circular,outCirclePaint); canvas.restore(); 
    //画秒指针 canvas.save(); canvas.rotate(second); canvas.drawLine(0,0,0,radius-10,secondPaint);
     canvas.restore(); 
    }
    

    这里需要说的是

    RectF hourRectF=new RectF(-pointRadio,-pointRadio,pointRadio,marginShort);
    

    用来确定指针的位置,pointRadio代表的是这个矩形的半径,而 canvas.rotate(180);旋转180保证按我们正常的思路一样指针向上,设RectF的左上角为(-pointRadio,-pointRadio)是为了保持在中心点(注:此时canvas的原点是view的中心),剩下就是画指针了。效果图如下:

    time3.PNG

    不用这是静态图,最后调用postInvalidateDelayed(1000);保证每个一秒就调用onDraw()方法来重绘View来实现view的每个一秒的动态变化,这样就完成效果图的功能。

    最后源码链接
    如果对你有帮助就请给我给星星或喜欢吧

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