本文實例為大家分享了android實現倒計時動態圈的具體代碼，供大家參考，具體內容如下

效果是這樣，沒動圖：

布局:

<LinearLayout android:layout_width='wrap_content' android:layout_centerVertical='true' android:layout_centerHorizontal='true' android:layout_centerInParent='true' android:layout_height='wrap_content'> <com.example.herman.testui.CountDownView android: android:layout_width='130dp' android:text='跳過' android:textColor='#ffffff' android:textSize='10sp' android:layout_height='130dp' /></LinearLayout>

values下新建一個attr.xml,內容是:

<?xml version='1.0' encoding='utf-8'?><resources> <declare-styleable name='CountDownView'> <!--顏色--> <attr name='ringColor' format='color' /> <!-- 進度文本的字體大小 --> <attr name='progressTextSize' format='dimension' /> <!-- 圓環寬度 --> <attr name='ringWidth' format='float' /> <!--進度文本顏色--> <attr name='progressTextColor' format='color'/> <!--倒計時--> <attr name='countdownTime' format='integer'/> </declare-styleable></resources>

一個類,類名CountDownView,代碼如下:

package com.example.herman.testui;import android.animation.Animator;import android.animation.AnimatorListenerAdapter;import android.animation.ValueAnimator;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.RectF;import android.util.AttributeSet;import android.view.View;import android.view.animation.LinearInterpolator;public class CountDownView extends View { //圓輪顏色 private int mRingColor; //圓輪寬度 private float mRingWidth; //圓輪進度值文本大小 private int mRingProgessTextSize; //寬度 private int mWidth; //高度 private int mHeight; private Paint mPaint; //圓環的矩形區域 private RectF mRectF; // private int mProgessTextColor; private int mCountdownTime; private float mCurrentProgress; private OnCountDownFinishListener mListener; 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.deepOrange)); mRingWidth = a.getFloat(R.styleable.CountDownView_ringWidth, 20); mRingProgessTextSize = a.getDimensionPixelSize(R.styleable.CountDownView_progressTextSize, DisplayUtil.sp2px(context, 20)); mProgessTextColor = a.getColor(R.styleable.CountDownView_progressTextColor, context.getResources().getColor(R.color.deepOrange)); mCountdownTime = a.getInteger(R.styleable.CountDownView_countdownTime, 10); a.recycle(); 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); /** *圓環 */ //顏色 mPaint.setColor(mRingColor); //空心 mPaint.setStyle(Paint.Style.STROKE); //寬度 mPaint.setStrokeWidth(mRingWidth); canvas.drawArc(mRectF, -90, mCurrentProgress - 360, false, mPaint); //繪制文本 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); //文字居中顯示 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; } /** * 開始倒計時 */ public void startCountDown() { setClickable(false); ValueAnimator 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);//倒計時結束回調if (mListener != null) { mListener.countDownFinished();}setClickable(true); } }); } public void setAddCountDownListener(OnCountDownFinishListener mListener) { this.mListener = mListener; } public interface OnCountDownFinishListener { void countDownFinished(); }}

activity中這樣調用:

CountDownView cdv = (CountDownView) findViewById(R.id.tv_red_skip);cdv.setAddCountDownListener(new CountDownView.OnCountDownFinishListener() { @Override public void countDownFinished() { //時間完了 干的事情 }});cdv.startCountDown();

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持好吧啦網。