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？
原文链接：https://www.f2er.com/android/534598.html