Android实现折线走势图

概述Android实现折线走势图 本文实例为大家分享了Android折线走势图的具体代码,供大家参考,具体内容如下 先来看看效果图 可以根据球的数量动态的改变自己的球半径,以及线宽 代码实现也是超级简单 //获取自定义属性 private void obtainStyledAttrs(AttributeSet attrs) { TypedArray typedArray = getContext().obtainStyledAttributes(attrs,R.styleable.High_LowChartView); mTex

本文实例为大家分享了AndroID折线走势图的具体代码，供大家参考，具体内容如下

先来看看效果图

可以根据球的数量动态的改变自己的球半径，以及线宽

代码实现也是超级简单

//获取自定义属性private voID obtainStyledAttrs(AttributeSet attrs) {  TypedArray typedArray = getContext().obtainStyledAttributes(attrs,R.styleable.High_LowChartVIEw);  mTextSize = (int)typedArray.getDimension(R.styleable.High_LowChartVIEw_hl_chart_textsize,mTextSize);  mTextcolor = typedArray.getcolor(R.styleable.High_LowChartVIEw_hl_chart_textcolor,mTextcolor);  if (typedArray.getString(R.styleable.High_LowChartVIEw_hl_hchart_text)!=null){   mHighText = typedArray.getString(R.styleable.High_LowChartVIEw_hl_hchart_text);  }  if(typedArray.getString(R.styleable.High_LowChartVIEw_hl_hchart_text)!=null){   mLowText = typedArray.getString(R.styleable.High_LowChartVIEw_hl_hchart_text);  }  mHighPointcolor = typedArray.getcolor(R.styleable.High_LowChartVIEw_hl_chart_high_pointcolor,mHighPointcolor);  mLowPointcolor = typedArray.getcolor(R.styleable.High_LowChartVIEw_hl_chart_low_pointcolor,mLowPointcolor);  mMainlinecolor = typedArray.getcolor(R.styleable.High_LowChartVIEw_hl_chart_mianlinecolor,mMainlinecolor);  mChartlinecolor = typedArray.getcolor(R.styleable.High_LowChartVIEw_hl_chart_chartlinecolor,mChartlinecolor);  mChartdistance = (int) typedArray.getDimension(R.styleable.High_LowChartVIEw_hl_chart_distance,mChartdistance);  init();  typedArray.recycle(); }//重写onMeasure @OverrIDe protected voID onMeasure(int wIDthMeasureSpec,int heightmeasureSpec) {  super.onMeasure(wIDthMeasureSpec,heightmeasureSpec);  int wIDth = MeasureSpec.getSize(wIDthMeasureSpec);  int height = measureHeight(heightmeasureSpec);  setMeasuredDimension(wIDth,height); }//计算vIEw需要的高度 private int measureHeight(int heightmeasureSpec) {  int result = 0;  int mode = MeasureSpec.getMode(heightmeasureSpec);  int size = MeasureSpec.getSize(heightmeasureSpec);  if(mode == MeasureSpec.EXACTLY){//如果给了具体值则直接用   result=size;  }else {  //否则高度等于字高与球直径的最大值   textHeight = (mPaint.descent()-mPaint.ascent());   float halfheight = Math.max(textHeight,mPointMaxHeight) / 2;   result = (int) (halfheight+mChartdistance);   //如果模式为AT_MOST即：测量高度不能超过父类给定的高度则取测量结果与size的最小值   if(mode==MeasureSpec.AT_MOST){    result = Math.min(result,size);   }  }  return result; } @OverrIDe protected voID onDraw(Canvas canvas) {  super.onDraw(canvas);  if(!initMeasure()) return;  canvas.save();  //1先画两条主线  mPaint.setcolor(mMainlinecolor);  mPaint.setstrokeWIDth(mainlineHeight);  //high line  canvas.drawline(textWIDth+DEFAulT_OFFSETTING,mainlineposition,w,mPaint);  //low line  canvas.drawline(textWIDth+DEFAulT_OFFSETTING,mainlineposition+mChartdistance,mPaint);  //2再画文字  mPaint.setcolor(mTextcolor);  mPaint.setTextAlign(Paint.Align.left);  Paint.FontMetricsInt FontMetrics = mPaint.getFontMetricsInt();  RectF rt1=new RectF(0,mainlineposition-textHeight/2,mainlineposition+textHeight/2);  int baseline = (int) ((rt1.bottom + rt1.top - FontMetrics.bottom - FontMetrics.top) / 2);  canvas.drawText(mHighText,baseline,mPaint);  canvas.drawText(mLowText,baseline+mChartdistance,mPaint);  //3初始化小球圆心  canvas.translate(textWIDth+DEFAulT_OFFSETTING,0);  for (int i=0;i<mPointNum;i++){   //high point   if (mList.get(i).isHighPoint){//    mPaint.setcolor(mHighPointcolor);//    canvas.drawCircle((pointHeight/2+offsetX)+i*(pointHeight+offsetX),pointHeight/2,mPaint);    //存入小球的圆心坐标    mList.get(i).setXY((pointHeight/2+offsetX)+i*(pointHeight+offsetX),mainlineposition);   }else {    //low point//    mPaint.setcolor(mLowPointcolor);//    canvas.drawCircle((pointHeight/2+offsetX)+i*(pointHeight+offsetX),mPaint);    mList.get(i).setXY((pointHeight/2+offsetX)+i*(pointHeight+offsetX),mainlineposition+mChartdistance);   }  }  //4连接小球  if(mList.size()>=2){   mPaint.setcolor(mChartlinecolor);   mPaint.setstrokeWIDth(chartlinewidth);   for (int i=0;i<mPointNum-1;i++){    canvas.drawline(mList.get(i).cx,mList.get(i).cy,mList.get(i+1).cx,mList.get(i+1).cy,mPaint);   }  }  //5绘制小球（为了不让线遮盖小球）  for (int i=0;i<mPointNum;i++){   //high point   if (mList.get(i).isHighPoint){    mPaint.setcolor(mHighPointcolor);    //low point   }else {    mPaint.setcolor(mLowPointcolor);   }   canvas.drawCircle(mList.get(i).cx,mPaint);  }  canvas.restore(); } /**  * 根据小球数量去动态测量一些属性  * @return  */ private boolean initMeasure() {  //根据传进来的point数量计算小点的大小，Mainline的线宽，折线的线宽   /* 如果小球数量在1-10个，主线高度为3dip   * 如果小球数量在10-20个，主线高度设置为2dip   * 如果小球数量超过20个，主线高度设置为1dp   */  mPointNum=mList.size();//  if(mPointNum==0) return false;  if(10>mPointNum){   mainlineHeight=dp2px(3);  }else if(10<=mPointNum&&20>mPointNum){   mainlineHeight = dp2px(2);  }else {   mainlineHeight = dp2px(1);  }  //主线长度等于总宽度-(文字宽度+30px)  textWIDth=Math.max(mPaint.measureText(mHighText),mPaint.measureText(mLowText));  mainlinewidth = (int) (w-(textWIDth+DEFAulT_OFFSETTING));  /*小球直径应该由主线长度与小球数量决定*/  //理想直径  float IDeaDia = mainlinewidth / (mPointNum + (mPointNum + 1));  //小球直径不能大于最大直径  if(IDeaDia>mPointMaxHeight){//   Log.i("TTT","IDeaDia>mPointMaxHeight");   pointHeight = mPointMaxHeight;   offsetX=(mainlinewidth-mPointNum*pointHeight)/(mPointNum+1);   //(极端情况)如果小球直径小于线高，为小球直径+2px  }else if(IDeaDia<=mainlineHeight){//   Log.i("TTT","IDeaDia<=mPointMaxHeight");   pointHeight = mainlineHeight+2;   offsetX=(mainlinewidth-mPointNum*pointHeight)/(mPointNum+1);  }else {//   Log.i("TTT"," pointHeight=offsetX=IDeaDia");   pointHeight=offsetX=IDeaDia;  }  //主线位置  mainlineposition = (h-mChartdistance)/2;  //折线宽度  chartlinewidth = mainlineHeight/2;  return true; }//刷新小球集合 public voID setPointList(List<AiyingPoint> List){  if (List==null&&List.size()==0) return;  mList.clear();  if (List.size()>150) {   mList.addAll(List.subList(0,150));  } else {   mList.addAll(List);  }  invalIDate(); }

使用示例

<com.androID.vIEw.High_LowChartVIEw   androID:ID="@+ID/hl_chart"   androID:layout_below="@+ID/tv_state"   androID:layout_marginleft="15dp"   androID:layout_marginRight="15dp"   androID:layout_wIDth="match_parent"   androID:layout_height="70dp"   app:hl_chart_mianlinecolor="#CDCDCD"   app:hl_chart_distance="55dp"   app:hl_chart_low_pointcolor="#999999"   app:hl_chart_high_pointcolor="#F70919"   app:hl_chart_textsize="13sp"   app:hl_chart_textcolor="#2f2f2f"   app:hl_chart_chartlinecolor="#999999" />

好了这样折线图就绘制完成了，是不是很简单呢？

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