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:
<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:
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:
<?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:
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(); } }); } }); }}
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本文标题: Android自定义圆环倒计时控件
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