Android自定义控件实现带数值和动画的圆形进度条
本文实例实现一个如下图所示的Android自定义控件,可以直观地展示某个球队在某个赛季的积分数和胜场、负场、平局数
首先对画布进行区域划分,整个控件分上下两部分
上边是个大的圆环,圆环中间两行文字,没什么难度,选好圆心坐标和半径后直接绘制即可,绘制文字也是如此。
下部分是三个小的圆弧进度条,弧的末端绘制一个小的实心圆
首先选好坐标和半径,然后先绘制三个圆环作为弧形进度条的背景
之后从12点钟开始绘制进度弧,知道了圆环的圆心和半径,也知道了弧对应于12点钟和圆环圆心的偏移角度
通过三角函数可以计算出进度弧终点坐标,以进度弧终点坐标为圆心绘制一个小的实心圆即可
动画效果通过Handler的postDelayed方法触发重绘即可实现
在项目中的效果如图所示:
测试代码如下:
final Random random=new Random(); final ScoreBoardView myView=(ScoreBoardView)findViewById(R.id.custom_view); myView.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v){ myView.setColor(Color.BLUE); myView.setScore(random.nextInt(28)); myView.setWinDrawLose(random.nextInt(12),random.nextInt(15),random.nextInt(26)); } });
完整代码如下:
public class ScoreBoardView extends View { private Context context; /*弧的颜色*/ private int mColor; /*积分数,胜场数,平局数,负场数*/ private int mScore, mWinNumber, mDrawNumber, mLoseNumber; /*传入数字的最大值*/ private final int FULL_SCORE = 30; /*动画插值器*/ DecelerateInterpolator mDecelerateInterpolator = new DecelerateInterpolator(); /*动画持续时间(刷新次数)*/ private int mDuration = 10; /*动画刷新过程中的当前值*/ private int mCurrentTime = 0; private TypedValue typedValue; private TypedValue typedValue1; private Handler mHandler = new Handler(); private Runnable mAnimation = new Runnable() { @Override public void run() { if (mCurrentTime < mDuration) { mCurrentTime++; /*导致重绘调用onDraw,onDraw最后再次postDelay执行此动画,直到达到指定的次数*/ ScoreBoardView.this.invalidate(); } } }; /*绘制图形*/ private Paint paint = new Paint(); /*绘制文字*/ private Paint paintText = new Paint(); public ScoreBoardView(Context context) { super(context); this.context=context; init(); } public ScoreBoardView(Context context, AttributeSet attrs) { super(context, attrs); this.context=context; init(); } public ScoreBoardView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); this.context=context; init(); } private void init() { /*数据初始化,默认属性*/ mColor = Color.rgb(95, 112, 72); mScore = 0; mWinNumber = 0; mDrawNumber = 0; mLoseNumber = 0; typedValue=new TypedValue(); typedValue1=new TypedValue(); context.getTheme().resolveAttribute(R.attr.maintextclor, typedValue, true); context.getTheme().resolveAttribute(R.attr.maintextclor_reverse,typedValue1,true); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); /*获取控件总的宽高*/ float totalWidth = getWidth(); float totalHeight = getHeight(); /* * DecelerateInterpolator:动画从开始到结束,变化率是一个减速的过程。 * AccelerateInterpolator:动画从开始到结束,变化率是一个加速的过程。 * CycleInterpolator:动画从开始到结束,变化率是循环给定次数的正弦曲线 * AccelerateDecelerateInterpolator:动画从开始到结束,变化率是先加速后减速的过程。 * LinearInterpolator:动画从开始到结束,变化率是线性变化。 * */ /*计算当前时刻动画进度值*/ float AnimCurrentValue =mDecelerateInterpolator.getInterpolation(1.0f * mCurrentTime / mDuration); /*图形画笔设置*/ paint.setAntiAlias(true); paint.setStyle(Paint.Style.STROKE); /*积分数,上边的大圆*/ paint.setStrokeWidth(4); paint.setColor(mColor); /*积分大圆的中心坐标和半径*/ float score_radius = totalHeight * 1 / 5, score_circle_x = totalWidth / 2, score_circle_y = totalHeight / 3; /*绘制圆弧*/ canvas.drawCircle(score_circle_x, score_circle_y, score_radius, paint); /*文字画笔基本设置*/ paintText.setAntiAlias(true); paintText.setStyle(Paint.Style.STROKE); /*文字从中间开始绘制*/ /*Paint.Align.CENTER:The text is drawn centered horizontally on the x,y origin*/ paintText.setTextAlign(Paint.Align.CENTER); /*文字画笔大小和颜色设置*/ paintText.setTextSize(score_radius * 3 / 4); paintText.setColor(getResources().getColor(typedValue.resourceId)); /*圆心位置绘制积分数值*/ canvas.drawText("" + mScore, score_circle_x, score_circle_y, paintText); /*缩小字体绘制文本信息*/ paintText.setTextSize(score_radius * 1 / 4); paintText.setAlpha(80); /*圆心下边绘制文本*/ canvas.drawText("积分", score_circle_x, score_circle_y + score_radius / 2, paintText); /*设置画笔,画下边的三个小圆*/ paint.setStrokeWidth(4); paint.setAlpha(255); /*下边三个小圆的半径*/ float small_radius = totalHeight / 10; /*三个小圆的圆心的x坐标*/ float[] circleXs = new float[]{totalWidth / 2 - score_radius * 3 / 2, totalWidth / 2, totalWidth / 2 + score_radius * 3 / 2}; /*三个小圆的圆心的y坐标*/ float circleY = totalHeight * 3 / 4; /*计算三个小圆弧扫过的角度*/ float[] theta_values = new float[]{360 * mWinNumber / FULL_SCORE* AnimCurrentValue, 360 * mDrawNumber / FULL_SCORE* AnimCurrentValue, 360 * mLoseNumber / FULL_SCORE* AnimCurrentValue}; /*设置画笔颜色,绘制外围圆环*/ paint.setColor(getResources().getColor(typedValue1.resourceId)); /*分别绘制三个外围圆环*/ canvas.drawCircle(circleXs[0], circleY, small_radius, paint);//画WIN背景圆 canvas.drawCircle(circleXs[1], circleY, small_radius, paint);//画DRAW背景圆 canvas.drawCircle(circleXs[2], circleY, small_radius, paint);//画LOSE背景圆 /*更改画笔颜色,绘制圆弧进度条*/ paint.setColor(mColor); /*drawArc的起始角度是3点钟方向,因此要从12点钟方向开始绘制,起始角度为270度*/ canvas.drawArc(new RectF(circleXs[0] - small_radius, circleY - small_radius, circleXs[0] + small_radius, circleY + small_radius), 270, theta_values[0], false, paint);//画WIN圆形进度条 canvas.drawArc(new RectF(circleXs[1] - small_radius, circleY - small_radius, circleXs[1] + small_radius, circleY + small_radius), 270, theta_values[1], false, paint);//画DRAW圆形进度条 canvas.drawArc(new RectF(circleXs[2] - small_radius, circleY - small_radius, circleXs[2] + small_radius, circleY + small_radius), 270, theta_values[2], false, paint);//画LOSE圆形进度条 /*绘制圆弧结束处的小圆点,实心圆*/ paint.setStyle(Paint.Style.FILL); /*已知半径、圆心位置、便宜角度,根据三角函数很方便计算出小实心圆圆心坐标*/ canvas.drawCircle(circleXs[0] + small_radius * (float) Math.sin(theta_values[0] * Math.PI / 180), circleY - small_radius * (float) Math.cos(theta_values[0] * Math.PI / 180), 6, paint);//画WIN末尾小圆点 canvas.drawCircle(circleXs[1] + small_radius * (float) Math.sin(theta_values[1] * Math.PI / 180), circleY - small_radius * (float) Math.cos(theta_values[1] * Math.PI / 180), 6, paint);//画DRAW末尾小圆点 canvas.drawCircle(circleXs[2] + small_radius * (float) Math.sin(theta_values[2] * Math.PI / 180), circleY - small_radius * (float) Math.cos(theta_values[2] * Math.PI / 180), 6, paint);//画LOSE末尾小圆点 /*绘制文字*/ paintText.setColor(getResources().getColor(typedValue.resourceId)); paintText.setTextSize(small_radius * 2 / 3); /*测量文字大小,确定绘制文字时垂直方向的位置*/ Paint.FontMetrics fontMetrics = paint.getFontMetrics(); float textBaseLineOffset = (fontMetrics.bottom - fontMetrics.top) / 2 - fontMetrics.bottom; /*在三个小圆的正中心位置绘制相应的数字*/ canvas.drawText("" + (int)(mWinNumber * AnimCurrentValue), circleXs[0], circleY + textBaseLineOffset, paintText); canvas.drawText("" + (int)(mDrawNumber * AnimCurrentValue), circleXs[1], circleY + textBaseLineOffset, paintText); canvas.drawText("" + (int)(mLoseNumber * AnimCurrentValue), circleXs[2], circleY + textBaseLineOffset, paintText); /*调整字体大小,绘制文本信息*/ paintText.setTextSize(small_radius * 4 / 9); canvas.drawText("胜场", circleXs[0], circleY - small_radius*4/3, paintText); canvas.drawText("平局", circleXs[1], circleY - small_radius*4/3, paintText); canvas.drawText("负场", circleXs[2], circleY - small_radius*4/3, paintText); /*20ms刷新一次数据*/ mHandler.postDelayed(mAnimation, 20);//启动动画 } public void setColor(int mColor) { this.mColor = mColor; invalidate(); } public void setScore(int score) { this.mScore = score; invalidate(); } public void setWinDrawLose(int win,int draw,int lose) { this.mWinNumber = win; this.mDrawNumber = draw; this.mLoseNumber = lose; mCurrentTime =0; invalidate(); } }
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