Android仿支付宝账单统计饼状图

/** * 饼状图 */public class PieChartView extends View {
  private Paint paintChart, paintText, paintLine, paintMasking;  private RectF mRectF = new RectF();  //饼状图的数据（如：name、value数值、颜色等）  private List mPieDatas = new ArrayList<>();  //总数，方便算百分比  private float mSumValue;  //半径  private int radius;  //直径  private int diameter;  //中心坐标  private int centerX, centerY;  //间隔的距离  private float space;
  private boolean showTip;  private int tipSize;  private boolean openAnimation;  private ValueAnimator mAnimator;
  // 默认的动效周期 2s  private int defaultDuration = 1000;  //动画的执行的百分比mAnimatorValue  private float mAnimatorValue = 1f;
  public PieChartView(Context context) {    super(context);    initAll();  }
  public PieChartView(Context context, @Nullable AttributeSet attrs) {    this(context, attrs, 0);  }
  public PieChartView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {    super(context, attrs, defStyleAttr);    TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.PieChartView, defStyleAttr, 0);    diameter = typedArray.getDimensionPixelSize(R.styleable.PieChartView_pie_size, 0);    space = typedArray.getFloat(R.styleable.PieChartView_pie_space, 0f);    openAnimation = typedArray.getBoolean(R.styleable.PieChartView_open_animation, false);    showTip = typedArray.getBoolean(R.styleable.PieChartView_show_tip, false);    tipSize = showTip?100:0;//如果显示tip，则预留出tip控件的间距    typedArray.recycle();    initAll();  }
  private void initAll() {    initPain();    if (openAnimation) {      startAnimation();    }  }
  private void initPain() {    paintChart = new Paint();    paintChart.setAntiAlias(true);    paintChart.setColor(Color.BLACK);
    paintMasking = new Paint();    paintMasking.setColor(Color.WHITE);    paintMasking.setStyle(Paint.Style.FILL);    paintMasking.setAntiAlias(true);
    paintLine = new Paint();    paintLine.setStyle(Paint.Style.STROKE);    paintLine.setStrokeWidth(5);    paintLine.setAntiAlias(true);
    paintText = new Paint();    paintText.setColor(Color.BLACK);    paintText.setStyle(Paint.Style.FILL);    paintText.setStrokeWidth(20);    paintText.setTextSize(30);  }
  /**   * 设置数据源   * @param pieData 饼状图的数据   */  public void setPieData(List pieData) {    if (pieData.size() > 0) {      mPieDatas = pieData;      if (mPieDatas.size() > 0) {        int sumValue = 0;        for (PieData data : mPieDatas) {          sumValue += data.getValue();        }        mSumValue = sumValue;      }    }  }
  @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {    super.onMeasure(widthMeasureSpec, heightMeasureSpec);  }
  @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) {    super.onSizeChanged(w, h, oldw, oldh);    //设置尺寸，没有设置pie_size或者设置的size + 预留给tip控件的距离>=最小边时不使用xml里设置的直径尺寸    if (diameter <= 0 || diameter+tipSize >= getWidth() || diameter+tipSize >= getHeight()) {      diameter = (getWidth() > getHeight() ? getHeight() : getWidth()) - tipSize;    }    radius = diameter / 2;    centerX = getWidth() / 2;    centerY = getHeight() / 2;    mRectF.set(centerX - radius, centerY - radius, centerX + radius, centerY + radius);  }
  private float startAngle = -90;  private float sweepAngle;
  @Override protected void onDraw(Canvas canvas) {    super.onDraw(canvas);    if (mPieDatas == null || mPieDatas.size() <= 0) {      canvas.drawArc(mRectF, 0, 360, true, paintChart);      canvas.drawCircle(centerX, centerY, radius / 2, paintMasking);      return;    }    for (PieData data : mPieDatas) {      paintChart.setColor(data.getColor());      paintLine.setColor(data.getColor());      sweepAngle = (data.getValue() / mSumValue) * 360f;      canvas.drawArc(mRectF, startAngle, sweepAngle * mAnimatorValue - space, true, paintChart);      if (showTip) {        //是否画标签说明的小部件        drawTip(canvas, data);      }      startAngle += sweepAngle;    }    canvas.drawCircle(centerX, centerY, radius / 2, paintMasking);  }
  /**   * 画tip控件   */  private void drawTip(Canvas canvas, PieData data) {    Path pathLine = new Path();    PathMeasure measure = new PathMeasure();
    float textPadding = 10;    float textHigh = (paintText.getFontMetrics().bottom - paintText.getFontMetrics().top) / 2;    float padding = 20;    float dotSize = 10;    float dotX = (float) (centerX + (radius + padding) * Math.cos(Math.toRadians((startAngle + sweepAngle / 2))));    float dotY = (float) (centerY + (radius + padding) * Math.sin(Math.toRadians((startAngle + sweepAngle / 2))));
    float lineX = (float) (centerX + (radius + padding * 2) * Math.cos(Math.toRadians((startAngle + sweepAngle / 2))));    float lineY = (float) (centerY + (radius + padding * 2) * Math.sin(Math.toRadians((startAngle + sweepAngle / 2))));    canvas.drawCircle(dotX, dotY, dotSize, paintChart);
    if (dotX > centerX) {      //右侧      pathLine.moveTo(dotX, dotY);      pathLine.lineTo(lineX, lineY);      pathLine.lineTo(getRight(), lineY);      measure.setPath(pathLine, false);      Path dst = new Path();      measure.getSegment(0, measure.getLength() * mAnimatorValue, dst, true);      canvas.drawPath(dst, paintLine);
      if (mAnimatorValue == 1) {        paintText.setTextAlign(Paint.Align.RIGHT);        canvas.drawText((data.getValue() / mSumValue) * 100 + "%", getWidth() - textPadding, lineY - textPadding, paintText);        canvas.drawText(data.getName(), getWidth() - textPadding, lineY + textHigh + textPadding, paintText);      }    } else {      //左侧      measure = new PathMeasure();      pathLine.moveTo(dotX, dotY);      pathLine.lineTo(lineX, lineY);      pathLine.lineTo(0, lineY);      measure.setPath(pathLine, false);      Path dst = new Path();      measure.getSegment(0, measure.getLength() * mAnimatorValue, dst, true);      canvas.drawPath(dst, paintLine);
      if (mAnimatorValue == 1) {        paintText.setTextAlign(Paint.Align.LEFT);        canvas.drawText((data.getValue() / mSumValue) * 100 + "%", 0 + textPadding, lineY - textPadding, paintText);        canvas.drawText(data.getName(), 0 + textPadding, lineY + textHigh + textPadding, paintText);      }    }  }
  /**   * 开启动画   */  private void startAnimation() {    mAnimator = ValueAnimator.ofFloat(0, 1).setDuration(defaultDuration);    mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {      @Override public void onAnimationUpdate(ValueAnimator valueAnimator) {        mAnimatorValue = (float) valueAnimator.getAnimatedValue();        invalidate();      }    });    mAnimator.start();  }}

            android:id="@+id/pie_char"        android:layout_width="match_parent"        android:layout_height="200dp"        app:pie_size="190dp"        app:pie_space="2"        app:show_tip="true"        app:open_animation="true"        android:visibility="visible"/>