Android自定义控件实现饼状图

@Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); /** * 饼状图的x坐标 */ float centreX= getWidth()/5; /** * 饼状图的y坐标 */ float centreY= getHeight()/2; /** * 文字的大小 */ float textSize=getHeight()/7; float width=(float)getWidth(); float height=(float)getHeight(); /** * 中间小正方形边长的一半 */ float halfSmallRec =((float)getHeight())*3/70; percent =((float) mBigBallNumber)/(mBigBallNumber + mSmallBallNumber); /** * 求饼状图的半径 */ radius= Math.min(getWidth() * 1 / 8, getHeight() * 10 / 35); /** * 构建一个正方形，饼状图是这个正方形的内切圆 */ rectf=new RectF((int)(centreX-radius),(int)(centreY-radius),(int)(centreX+radius),(int)(centreY+radius)); /** * 设置饼状图画笔的颜色，先绘制大球占的比例 */ piePaint.setColor(mBigBallColor); /* The arc is drawn clockwise. An angle of 0 degrees correspond to the * geometric angle of 0 degrees (3 o'clock on a watch.)*/ /* drawArc(RectF oval, float startAngle, float sweepAngle, boolean useCenter,Paint paint)*/ /** * 绘制大球的扇形图，float startAngle起始角度的0度的位置在3点钟方向 * 因此大球的扇形图要从12点钟开始绘制，所以起始角度为270度 */ canvas.drawArc(rectf, 270, 360 * percent, true, piePaint); /** * 换种颜色，开始绘制小球占的饼状图 */ piePaint.setColor(mSmallBallColor); /** * 起始角度就是12点钟加上360度乘以大球占的比例，12点钟转换为起始角度为270度 */ canvas.drawArc(rectf, 270 + 360 * percent, 360 - 360 * percent, true, piePaint); 颜色更改为大球的颜色*/ piePaint.setColor(mBigBallColor); /** * 绘制上边的小方块，也就是大球的方块 */ canvas.drawRect(width * 2 / 5 - halfSmallRec, height* 23/ 60 - halfSmallRec, width * 2 / 5 + halfSmallRec, height *23/ 60 + halfSmallRec, piePaint); /** * 更改画笔颜色为小球颜色 */ piePaint.setColor(mSmallBallColor); /** * 绘制下边的小方块即小球的小方块 */ canvas.drawRect(width * 2 / 5 - halfSmallRec, height * 37 / 60 - halfSmallRec, width * 2 / 5 + halfSmallRec, height * 37 / 60 + halfSmallRec, piePaint); /** * 开始绘制文字，先设置文字颜色 */ textPaint.setColor(getResources().getColor(typedValue.resourceId)); /** * 设置问题大小 */ textPaint.setTextSize(textSize); /** * 大球数量 */ String strBig = strBigBallName + mBigBallNumber; /** * 测量文字宽度 */ float textBigWidth =textPaint.measureText(strBig); Paint.FontMetrics fontMetrics=textPaint.getFontMetrics(); /** * 绘制上边大球数量 */ canvas.drawText(strBig, width * 9 / 20 + textBigWidth / 2, height *23/ 60 - fontMetrics.top / 3, textPaint); /** * 小球数量 */ String strSmall = strSmallBallName + mSmallBallNumber; /** * 测量文字宽度 */ float textUnderWidth=textPaint.measureText(strSmall); /** * 绘制下边的小球数量 */ canvas.drawText(strSmall,width*9/20+textUnderWidth/2,height*37/60-fontMetrics.top/3,textPaint); /** * 更改画笔颜色，开始绘制百分比 */ textPaint.setColor(getResources().getColor(R.color.half_transparent)); String strBigPercent =" ("+ mPercentBigBall +")"; /** * 测量大球百分比文字宽度 */ float bigPercent =textPaint.measureText(strBigPercent); /**drawText(String text, float x, float y, Paint paint) * 绘制文字的API，四个参数分别是文字内容，起始绘制x坐标，起始绘制y坐标，画笔 * 以为设置了居中绘制，因此穿进去的xy坐标为文字的中心点 */ canvas.drawText(strBigPercent, width * 9 / 20+ textBigWidth + bigPercent /2, height*23 / 60-fontMetrics.top*1/3, textPaint); /** * 同样的道理绘制小球的百分比 */ String strSmallPercent =" ("+ mPercentSmallBall +")"; float smallPercent =textPaint.measureText(strSmallPercent); canvas.drawText(strSmallPercent,width*9/20+textUnderWidth+ smallPercent /2,height*37/60-fontMetrics.top/3,textPaint); }

public class PieHalfView extends View { /** * 左边饼状图的画笔 */ private Paint piePaint; /** * 右边文字的画笔 */ private Paint textPaint; /** * 饼状图的半径 */ private float radius; private RectF rectf; /** * 饼状图中第一个扇形占整个圆的比例 */ private float percent; /** * 深浅两种颜色 */ private int mBigBallColor, mSmallBallColor; /** * 大小球的数量 */ private int mBigBallNumber; private int mSmallBallNumber; /** * 大小球所占的百分比 */ private String mPercentBigBall; private String mPercentSmallBall; /** * 动态获取属性 */ private TypedValue typedValue; /** * 中间的文字信息 */ private String strBigBallName; private String strSmallBallName; public PieHalfView(Context context) { super(context); init(context); } public PieHalfView(Context context, AttributeSet attrs) { super(context, attrs); init(context); } public PieHalfView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context); } private void init(Context context) { /** * 设置饼状图画笔 */ piePaint =new Paint(); piePaint.setAntiAlias(true); piePaint.setStyle(Paint.Style.FILL); /** * 设置文字画笔 */ textPaint=new Paint(); textPaint.setStyle(Paint.Style.STROKE); textPaint.setAntiAlias(true); textPaint.setTextAlign(Paint.Align.CENTER); /** * 下边设置一些默认的值，如果调用者没有传值进来的话，用这些默认值 */ mBigBallColor = 0xFF9CCA5D; mSmallBallColor =0xFF5F7048; /*TypedValue：Container for a dynamically typed data value. Primarily used with Resources for holding resource values.*/ typedValue=new TypedValue(); context.getTheme().resolveAttribute(R.attr.maintextclor,typedValue,true); mBigBallNumber =1; mSmallBallNumber =3; mPercentBigBall ="40%"; mPercentSmallBall ="60%"; strBigBallName =getResources().getString(R.string.big); strSmallBallName =getResources().getString(R.string.small); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); /** * 饼状图的x坐标 */ float centreX= getWidth()/5; /** * 饼状图的y坐标 */ float centreY= getHeight()/2; /** * 文字的大小 */ float textSize=getHeight()/7; float width=(float)getWidth(); float height=(float)getHeight(); /** * 中间小正方形边长的一半 */ float halfSmallRec =((float)getHeight())*3/70; percent =((float) mBigBallNumber)/(mBigBallNumber + mSmallBallNumber); /** * 求饼状图的半径 */ radius= Math.min(getWidth() * 1 / 8, getHeight() * 10 / 35); /** * 构建一个正方形，饼状图是这个正方形的内切圆 */ rectf=new RectF((int)(centreX-radius),(int)(centreY-radius),(int)(centreX+radius),(int)(centreY+radius)); /** * 设置饼状图画笔的颜色，先绘制大球占的比例 */ piePaint.setColor(mBigBallColor); /* The arc is drawn clockwise. An angle of 0 degrees correspond to the * geometric angle of 0 degrees (3 o'clock on a watch.)*/ /* drawArc(RectF oval, float startAngle, float sweepAngle, boolean useCenter,Paint paint)*/ /* 绘制大球的扇形图，float startAngle起始角度的0度的位置在3点钟方向 * 因此大球的扇形图要从12点钟开始绘制，所以起始角度为270度*/ canvas.drawArc(rectf, 270, 360 * percent, true, piePaint); /** * 换种颜色，开始绘制小球占的饼状图 */ piePaint.setColor(mSmallBallColor); /** * 起始角度就是12点钟加上360度乘以大球占的比例，12点钟转换为起始角度为270度 */ canvas.drawArc(rectf, 270 + 360 * percent, 360 - 360 * percent, true, piePaint); /** * 颜色更改为大球的颜色*/ piePaint.setColor(mBigBallColor); /** * 绘制上边的小方块，也就是大球的方块 */ canvas.drawRect(width * 2 / 5 - halfSmallRec, height* 23/ 60 - halfSmallRec, width * 2 / 5 + halfSmallRec, height *23/ 60 + halfSmallRec, piePaint); /** * 更改画笔颜色为小球颜色 */ piePaint.setColor(mSmallBallColor); /** * 绘制下边的小方块即小球的小方块 */ canvas.drawRect(width * 2 / 5 - halfSmallRec, height * 37 / 60 - halfSmallRec, width * 2 / 5 + halfSmallRec, height * 37 / 60 + halfSmallRec, piePaint); /** * 开始绘制文字，先设置文字颜色 */ textPaint.setColor(getResources().getColor(typedValue.resourceId)); /** * 设置问题大小 */ textPaint.setTextSize(textSize); /** * 大球数量 */ String strBig = strBigBallName + mBigBallNumber; /** * 测量文字宽度 */ float textBigWidth =textPaint.measureText(strBig); Paint.FontMetrics fontMetrics=textPaint.getFontMetrics(); /** * 绘制上边大球数量 */ canvas.drawText(strBig, width * 9 / 20 + textBigWidth / 2, height *23/ 60 - fontMetrics.top / 3, textPaint); /** * 小球数量 */ String strSmall = strSmallBallName + mSmallBallNumber; /** * 测量文字宽度 */ float textUnderWidth=textPaint.measureText(strSmall); /** * 绘制下边的小球数量 */ canvas.drawText(strSmall,width*9/20+textUnderWidth/2,height*37/60-fontMetrics.top/3,textPaint); /** * 更改画笔颜色，开始绘制百分比 */ textPaint.setColor(getResources().getColor(R.color.half_transparent)); String strBigPercent =" ("+ mPercentBigBall +")"; /** * 测量大球百分比文字宽度*/ float bigPercent =textPaint.measureText(strBigPercent); /** drawText(String text, float x, float y, Paint paint) * 绘制文字的API，四个参数分别是文字内容，起始绘制x坐标，起始绘制y坐标，画笔 * 以为设置了居中绘制，因此穿进去的xy坐标为文字的中心点 */ canvas.drawText(strBigPercent, width * 9 / 20+ textBigWidth + bigPercent /2, height*23 / 60-fontMetrics.top*1/3, textPaint); /* * 同样的道理绘制小球的百分比 */ String strSmallPercent =" ("+ mPercentSmallBall +")"; float smallPercent =textPaint.measureText(strSmallPercent); canvas.drawText(strSmallPercent,width*9/20+textUnderWidth+ smallPercent /2,height*37/60-fontMetrics.top/3,textPaint); } public void setPercent(float percent1){ this.percent =percent1; invalidate(); } public void setColor(int mBigBallColor,int mSmallBallColor){ this.mBigBallColor =mBigBallColor; this.mSmallBallColor =mSmallBallColor; invalidate(); } public void setOverRunner(String bigPecent, String smallPercent, int big, int small, int bigColor, int smallColor){ this.mPercentBigBall = bigPecent; this.mPercentSmallBall = smallPercent; this.mBigBallNumber = big; this.mSmallBallNumber = small; this.mBigBallColor = bigColor; this.mSmallBallColor = smallColor; invalidate(); } }

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