Android自定义圆环倒计时控件

import android.animation.ValueAnimator;
import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Paint.FontMetricsInt;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
import android.view.animation.LinearInterpolator;
 
import com.daodaojk.myapplication.R;
 
public class CountDownProgressBar extends View {
 /**
  * 进度条最大值
  */
 private int maxValue = 200;
 
 /**
  * 当前进度值
  */
 private int currentValue ;
 
 /**
  * 每次扫过的角度，用来设置进度条圆弧所对应的圆心角，alphaAngle=(currentValue/maxValue)*360
  */
 private float alphaAngle;
 
 /**
  * 底部圆弧的颜色，默认为Color.LTGRAY
  */
 private int firstColor;
 
 /**
  * 进度条圆弧块的颜色
  */
 private int secondColor;
 /**
  * 中间文字颜色(默认蓝色)
  */
 private int centerTextColor = Color.BLUE;
 /**
  * 中间文字的字体大小(默认40dp)
  */
 private int centerTextSize;
 
 /**
  * 圆环的宽度
  */
 private int circleWidth;
 
 /**
  * 画圆弧的画笔
  */
 private Paint circlePaint;
 
 /**
  * 画文字的画笔
  */
 private Paint textPaint;
 /**
  * 是否使用渐变色
  */
 private boolean isShowGradient = false;
 
 /**
  * 渐变圆周颜色数组
  */
 private int[] colorArray = new int[]{Color.parseColor("#2773FF"),
   Color.parseColor("#27C0D2"), Color.parseColor("#40C66E")};
 private int duration;
 private OnFinishListener listener;
 private ValueAnimator animator;
 
 public CountDownProgressBar(Context context) {
  this(context, null);
 }
 
 
 public CountDownProgressBar(Context context, AttributeSet attrs) {
  this(context, attrs, 0);
 }
 
 
 public CountDownProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
 
  TypedArray ta = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CountDownProgressBar,
    defStyleAttr, 0);
  int n = ta.getIndexCount();
 
  for (int i = 0; i 
  *
  * @param color
  */
 public void setSecondColor(int color) {
  this.secOndColor= color;
  circlePaint.setColor(secondColor);
  //一般只是希望在View发生改变时对UI进行重绘。invalidate()方法系统会自动调用 View的onDraw()方法。
  invalidate();
 }
 
 /**
  * 设置进度条渐变色颜色数组
  *
  * @param colors 颜色数组，类型为int[]
  */
 public void setColorArray(int[] colors) {
  this.colorArray = colors;
  //一般只是希望在View发生改变时对UI进行重绘。invalidate()方法系统会自动调用 View的onDraw()方法。
  invalidate();
 }
 
 
 /**
  * 按进度显示百分比，可选择是否启用数字动画
  *
  * @param duration 动画时长
  */
 public void setDuration(int duration, OnFinishListener listener) {
   this.listener = listener;
  this.duration = duration + 1000;
  if (animator != null) {
   animator.cancel();
  } else {
   animator = ValueAnimator.ofInt(0, maxValue);
   animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
    @Override
    public void onAnimationUpdate(ValueAnimator animation) {
     currentValue = (int) animation.getAnimatedValue();
     //一般只是希望在View发生改变时对UI进行重绘。invalidate()方法系统会自动调用 View的onDraw()方法。
     invalidate();
     if (maxValue == currentValue && CountDownProgressBar.this.listener != null) {
      CountDownProgressBar.this.listener.onFinish();
     }
    }
   });
   animator.setInterpolator(new LinearInterpolator());
  }
  animator.setDuration(duration);
  animator.start();
 }
 
 public interface OnFinishListener {
  void onFinish();
 }
 
 public void setOnFinishListener(OnFinishListener listener) {
  this.listener = listener;
 }
 
 public static int px2dip(int pxValue) {
  final float scale = Resources.getSystem().getDisplayMetrics().density;
  return (int) (pxValue / scale + 0.5f);
 }
 
 
 public static float dip2px(float dipValue) {
  final float scale = Resources.getSystem().getDisplayMetrics().density;
  return (dipValue * scale + 0.5f);
 }
} 

<&＃63;xml version="1.0" encoding="utf-8"&＃63;>


 

package com.daodaojk.myapplication.ui;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
 
import com.daodaojk.myapplication.R;
import com.daodaojk.myapplication.view.CountDownProgressBar;
 
public class CountDownActivity extends AppCompatActivity {
 
 private CountDownProgressBar cpb_countdown;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_count_down);
  Button btn_start = findViewById(R.id.btn_start);
  cpb_countdown = (CountDownProgressBar) findViewById(R.id.cpb_countdown);
  btn_start.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    cpb_countdown.setDuration(10000, new CountDownProgressBar.OnFinishListener() {
     @Override
     public void onFinish() {
      Toast.makeText(CountDownActivity.this, "完成了", Toast.LENGTH_SHORT).show();
     }
    });
   }
  });
 }
}