Android实现自定义倒计时

最近工作中遇到个要做倒计时60秒的进度条，经过参考别人的资料做出来需求的效果。废话少说先来个效果：

一定想知道是怎么实现的吧！下面是代码

public class CountDownView extends View { //圆轮颜色 private int mRingColor; //默认圆颜色 private int mRingNormalColor ; //圆轮宽度 private float mRingWidth; //圆轮进度值文本大小 private int mRingProgessTextSize; //宽度 private int mWidth; //高度 private int mHeight; private Paint mPaint; private Paint paintNormal; //圆环的矩形区域 private RectF mRectF; // private int mProgessTextColor; private int mCountdownTime; private float mCurrentProgress; private OnCountDownFinishListener mListener; private ValueAnimator valueAnimator ; public CountDownView(Context context) { this(context, null); } public CountDownView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public CountDownView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CountDownView); mRingColor = a.getColor(R.styleable.CountDownView_ringColor, context.getResources().getColor(R.color.circle_progress)); mRingWidth = a.getFloat(R.styleable.CountDownView_ringWidth, 8); mRingProgessTextSize = a.getDimensionPixelSize(R.styleable.CountDownView_progressTextSize, DisplayUtil.sp2px(context, 12)); mProgessTextColor = a.getColor(R.styleable.CountDownView_progressTextColor, context.getResources().getColor(R.color.circle_progress)); mCountdownTime = a.getInteger(R.styleable.CountDownView_countdownTime, 60); mRingNormalColor = a.getColor(R.styleable.CountDownView_ringColor, context.getResources().getColor(R.color._circle_progress)); a.recycle(); paintNormal = new Paint(Paint.ANTI_ALIAS_FLAG); paintNormal.setAntiAlias(true); mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setAntiAlias(true); this.setWillNotDraw(false); } public void setCountdownTime(int mCountdownTime) { this.mCountdownTime = mCountdownTime; } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); mWidth = getMeasuredWidth(); mHeight = getMeasuredHeight(); mRectF = new RectF(0 + mRingWidth / 2, 0 + mRingWidth / 2, mWidth - mRingWidth / 2, mHeight - mRingWidth / 2); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); /** *圆环 */ //颜色 mPaint.setColor(mRingColor); //空心 mPaint.setStyle(Paint.Style.STROKE); //宽度 mPaint.setStrokeWidth(mRingWidth); /** *默认圆环 */ //颜色 paintNormal.setColor(mRingNormalColor); //空心 paintNormal.setStyle(Paint.Style.STROKE); //宽度 paintNormal.setStrokeWidth(mRingWidth); canvas.drawArc(mRectF, 360, 360, false, paintNormal); canvas.drawArc(mRectF, -90, mCurrentProgress - 360, false, mPaint); //绘制文本 Paint textPaint = new Paint(); textPaint.setAntiAlias(true); textPaint.setTextAlign(Paint.Align.CENTER); String text = mCountdownTime - (int) (mCurrentProgress / 360f * mCountdownTime) + ''; textPaint.setTextSize(mRingProgessTextSize); textPaint.setColor(mProgessTextColor); //文字居中显示 Paint.FontMetricsInt fontMetrics = textPaint.getFontMetricsInt(); int baseline = (int) ((mRectF.bottom + mRectF.top - fontMetrics.bottom - fontMetrics.top) / 2); canvas.drawText(text, mRectF.centerX(), baseline, textPaint); } private ValueAnimator getValA(long countdownTime) { ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, 100); valueAnimator.setDuration(countdownTime); valueAnimator.setInterpolator(new LinearInterpolator()); valueAnimator.setRepeatCount(0); return valueAnimator; } /** * 开始倒计时 */ public void startCountDown() { setClickable(false); valueAnimator = getValA(mCountdownTime * 1000); valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { float i = Float.valueOf(String.valueOf(animation.getAnimatedValue())); mCurrentProgress = (int) (360 * (i / 100f)); invalidate(); } }); valueAnimator.start(); valueAnimator.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { super.onAnimationEnd(animation); //倒计时结束回调 if (mListener != null) { mListener.countDownFinished(); } setClickable(true); } }); } public void setAddCountDownListener(OnCountDownFinishListener mListener) { this.mListener = mListener; } public interface OnCountDownFinishListener { void countDownFinished(); } public void stopCountDown(){ valueAnimator.end(); } }

然后新建一个attr.xml;

<?xml version='1.0' encoding='utf-8'?><resources> <declare-styleable name='CountDownView'> <!--颜色--> <attr name='ringColor' format='color' /> <!-- 进度文本的字体大小 --> <attr name='progressTextSize' format='dimension' /> <!-- 圆环宽度 --> <attr name='ringWidth' format='float' /> <!--进度文本颜色--> <attr name='progressTextColor' format='color'/> <!--倒计时--> <attr name='countdownTime' format='integer'/> </declare-styleable></resources>

这样一个自定义的view就写完了；那怎么用呢；布局就不说了；

losTime.setAddCountDownListener(new CountDownView.OnCountDownFinishListener() { @Override public void countDownFinished() { 倒计时结束 } });losTime.setCountdownTime(60);losTime.startCountDown();

这样就轻轻松松的跑起来了，希望能帮助到需要的你；

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持好吧啦网。