本文实例为大家分享了Android自定义圆环倒计时控件的具体代码，供大家参考，具体内容如下
先来一张最终效果图:
主要思路:在画渐变色圆环的时候,设置一个属性动画,根据属性动画的执行时长,来作为倒计时的时长.监听属性动画的进度,来达到 倒计时的目的.
二话不说,直接贴代码.具体实现思路都在注释上.
自定义属性:
代码语言：javascript复制<declare-styleable name="CountDownProgressBar"
<attr name="countDown_circleWidth" format="dimension" /
<attr name="countDown_centerTextSize" format="dimension" /
<attr name="countDown_betaAngle" format="integer" /
<attr name="countDown_firstColor" format="color" /
<attr name="countDown_secondColor" format="color" /
<attr name="countDown_centerTextColor" format="color" /
<attr name="countDown_isShowGradient" format="boolean" /
</declare-styleable 主要代码:
代码语言：javascript复制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 < n; i ) {
int attr = ta.getIndex(i);
switch (attr) {
case R.styleable.CountDownProgressBar_countDown_firstColor:
firstColor = ta.getColor(attr, Color.LTGRAY); // 默认底色为亮灰色
break;
case R.styleable.CountDownProgressBar_countDown_secondColor:
secondColor = ta.getColor(attr, Color.BLUE); // 默认进度条颜色为蓝色
break;
case R.styleable.CountDownProgressBar_countDown_centerTextSize:
centerTextSize = ta.getDimensionPixelSize(attr, (int) dip2px(40)); // 默认中间文字字体大小为40dp
break;
case R.styleable.CountDownProgressBar_countDown_circleWidth:
circleWidth = ta.getDimensionPixelSize(attr, (int) dip2px(6f)); // 默认圆弧宽度为6dp
break;
case R.styleable.CountDownProgressBar_countDown_centerTextColor:
centerTextColor = ta.getColor(attr, Color.BLUE); // 默认中间文字颜色为蓝色
break;
case R.styleable.CountDownProgressBar_countDown_isShowGradient:
isShowGradient = ta.getBoolean(attr, false); // 默认不适用渐变色
break;
default:
break;
}
}
ta.recycle();
circlePaint = new Paint();
circlePaint.setAntiAlias(true); // 抗锯齿
circlePaint.setDither(true); // 防抖动
circlePaint.setStrokeWidth(circleWidth);//画笔宽度
textPaint = new Paint();
textPaint.setAntiAlias(true);
textPaint.setDither(true);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// 分别获取期望的宽度和高度，并取其中较小的尺寸作为该控件的宽和高,并且不超过屏幕宽高
int widthPixels = this.getResources().getDisplayMetrics().widthPixels;//获取屏幕宽
int heightPixels = this.getResources().getDisplayMetrics().heightPixels;//获取屏幕高
int width = MeasureSpec.getSize(widthMeasureSpec);
int hedight = MeasureSpec.getSize(heightMeasureSpec);
int minWidth = Math.min(widthPixels, width);
int minHedight = Math.min(heightPixels, hedight);
setMeasuredDimension(Math.min(minWidth, minHedight), Math.min(minWidth, minHedight));
}
@Override
protected void onDraw(Canvas canvas) {
int center = this.getWidth() / 2;
int radius = center - circleWidth / 2;
drawCircle(canvas, center, radius); // 绘制进度圆弧
drawText(canvas, center);
}
/**
* 绘制进度圆弧
*
* @param canvas 画布对象
* @param center 圆心的x和y坐标
* @param radius 圆的半径
*/
private void drawCircle(Canvas canvas, int center, int radius) {
circlePaint.setShader(null); // 清除上一次的shader
circlePaint.setColor(firstColor); // 设置底部圆环的颜色，这里使用第一种颜色
circlePaint.setStyle(Paint.Style.STROKE); // 设置绘制的圆为空心
canvas.drawCircle(center, center, radius, circlePaint); // 画底部的空心圆
RectF oval = new RectF(center - radius, center - radius, center radius, center radius); // 圆的外接正方形
if (isShowGradient) {
// 绘制颜色渐变圆环
// shader类是Android在图形变换中非常重要的一个类。Shader在三维软件中我们称之为着色器，其作用是来给图像着色。
LinearGradient linearGradient = new LinearGradient(circleWidth, circleWidth, getMeasuredWidth()
- circleWidth, getMeasuredHeight() - circleWidth, colorArray, null, Shader.TileMode.MIRROR);
circlePaint.setShader(linearGradient);
}
circlePaint.setShadowLayer(10, 10, 10, Color.BLUE);
circlePaint.setColor(secondColor); // 设置圆弧的颜色
circlePaint.setStrokeCap(Paint.Cap.ROUND); // 把每段圆弧改成圆角的
alphaAngle = currentValue * 360.0f / maxValue * 1.0f; // 计算每次画圆弧时扫过的角度，这里计算要注意分母要转为float类型，否则alphaAngle永远为0
canvas.drawArc(oval, -90, alphaAngle, false, circlePaint);
}
/**
* 绘制文字
*
* @param canvas 画布对象
* @param center 圆心的x和y坐标
*/
private void drawText(Canvas canvas, int center) {
int result = ((maxValue - currentValue) * (duration / 1000) / maxValue); // 计算进度
String percent;
if (maxValue == currentValue) {
percent = "完成";
textPaint.setTextSize(centerTextSize); // 设置要绘制的文字大小
} else {
percent = (result / 60 < 10 ? "0" result / 60 : result / 60) ":" (result % 60 < 10 ? "0" result % 60 : result % 60);
// percent = result "秒";
textPaint.setTextSize(centerTextSize centerTextSize/3); // 设置要绘制的文字大小
}
textPaint.setTextAlign(Paint.Align.CENTER); // 设置文字居中，文字的x坐标要注意
textPaint.setColor(centerTextColor); // 设置文字颜色
textPaint.setStrokeWidth(0); // 注意此处一定要重新设置宽度为0,否则绘制的文字会重叠
Rect bounds = new Rect(); // 文字边框
textPaint.getTextBounds(percent, 0, percent.length(), bounds); // 获得绘制文字的边界矩形
FontMetricsInt fontMetrics = textPaint.getFontMetricsInt(); // 获取绘制Text时的四条线
int baseline = center (fontMetrics.bottom - fontMetrics.top) / 2 - fontMetrics.bottom; // 计算文字的基线 canvas.drawText(percent, center, baseline, textPaint); // 绘制表示进度的文字
}
/**
* 设置圆环的宽度
*
* @param width
*/
public void setCircleWidth(int width) {
this.circleWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, width, getResources()
.getDisplayMetrics());
circlePaint.setStrokeWidth(circleWidth);
//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();
}
/**
* 设置圆环的底色，默认为亮灰色LTGRAY
*
* @param color
*/
public void setFirstColor(int color) {
this.firstColor = color;
circlePaint.setColor(firstColor);
//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();
}
/**
* 设置进度条的颜色，默认为蓝色<br
*
* @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);
}
} xml布局:
代码语言：javascript复制<?xml version="1.0" encoding="utf-8"?
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
<Button
android:layout_width="match_parent"
android:text="开始"
android:id="@ id/btn_start"
android:layout_height="wrap_content" /
<com.daodaojk.myapplication.view.CountDownProgressBar
android:id="@ id/cpb_countdown"
android:layout_width="200dp"
android:layout_marginTop="100dp"
android:layout_gravity="center_horizontal"
app:countDown_centerTextSize="25dp"
app:countDown_circleWidth="4dp"
app:countDown_firstColor="@color/text_gray_ccc"
app:countDown_secondColor="@color/text_blue"
app:countDown_isShowGradient="true"
app:countDown_centerTextColor="#2395FF"
android:layout_height="200dp" /
</LinearLayout 页面调用:
代码语言：javascript复制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();
}
});
}
});
}
}以上就是本文的全部内容，希望对大家的学习有所帮助。
