转载请标明出处:
http://blog.csdn.net/hanhailong726188/article/details/47363911
本文出自:海龙的博客
一、概述
最近做了一个比较清新的进度条,没啥难度的,就是涉及到属性动画和canvas绘制圆形的知识,因为群里有一个问怎么实现的,这里就稍微写了一下原理,先看效果图
二、效果图
Gif录制的帧数有点低,导致稍微有点卡,但是在真实运行的时候一点都不卡
三、实现原理
- 自定义view
- 自定义属性动画
- canvas画圆
四、代码实现
因为代码非常简单,注释也非常详细,看一下代码就明白了,这里就直接贴代码了:
package com.hhl.twoballrotationprogress;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.support.annotation.ColorInt;
import android.support.annotation.Keep;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.DecelerateInterpolator;
/**
* 两个颜色的小球循环旋转,
* 目前只支持代码设置颜色、最大半径、最小半径等属性
* version 1.0
* //TODO 2.0 添加xml自定义属性支持
* Created by HanHailong on 15/8/07.
*/
public class TwoBallRotationProgressBar extends View {
//默认小球最大半径
private final static int DEFAULT_MAX_RADIUS = 15;
//默认小球最小半径
private final static int DEFAULT_MIN_RADIUS = 5;
//默认两个小球运行轨迹直径距离
private final static int DEFAULT_DISTANCE = 20;
//默认第一个小球颜色
private final static int DEFAULT_ONE_BALL_COLOR = Color.parseColor("#40df73");
//默认第二个小球颜色
private final static int DEFAULT_TWO_BALL_COLOR = Color.parseColor("#ffdf3e");
//默认动画执行时间
private final static int DEFAULT_ANIMATOR_DURATION = 1000;
//画笔
private Paint mPaint;
//球的最大半径
private float maxRadius = DEFAULT_MAX_RADIUS;
//球的最小半径
private float minRadius = DEFAULT_MIN_RADIUS;
//两球旋转的范围距离
private int distance = DEFAULT_DISTANCE;
//动画的时间
private long duration = DEFAULT_ANIMATOR_DURATION;
private Ball mOneBall;
private Ball mTwoBall;
private float mCenterX;
private float mCenterY;
private AnimatorSet animatorSet;
public TwoBallRotationProgressBar(Context context) {
this(context, null);
}
public TwoBallRotationProgressBar(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public TwoBallRotationProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
private void init(Context context) {
mOneBall = new Ball();
mTwoBall = new Ball();
mOneBall.setColor(DEFAULT_ONE_BALL_COLOR);
mTwoBall.setColor(DEFAULT_TWO_BALL_COLOR);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
configAnimator();
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mCenterX = w / 2;
mCenterY = h / 2;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mCenterX = getWidth() / 2;
mCenterY = getHeight() / 2;
}
@Override
protected void onDraw(Canvas canvas) {
//画两个小球,半径小的先画,半径大的后画
if (mOneBall.getRadius() > mTwoBall.getRadius()) {
mPaint.setColor(mTwoBall.getColor());
canvas.drawCircle(mTwoBall.getCenterX(), mCenterY, mTwoBall.getRadius(), mPaint);
mPaint.setColor(mOneBall.getColor());
canvas.drawCircle(mOneBall.getCenterX(), mCenterY, mOneBall.getRadius(), mPaint);
} else {
mPaint.setColor(mOneBall.getColor());
canvas.drawCircle(mOneBall.getCenterX(), mCenterY, mOneBall.getRadius(), mPaint);
mPaint.setColor(mTwoBall.getColor());
canvas.drawCircle(mTwoBall.getCenterX(), mCenterY, mTwoBall.getRadius(), mPaint);
}
}
/**
* 配置属性动画
*/
private void configAnimator() {
//中间半径大小
float centerRadius = (maxRadius + minRadius) * 0.5f;
//第一个小球缩放动画,通过改变小球的半径
//半径变化规律:中间大小->最大->中间大小->最小->中间大小
ObjectAnimator oneScaleAnimator = ObjectAnimator.ofFloat(mOneBall, "radius",
centerRadius, maxRadius, centerRadius, minRadius, centerRadius);
//无限循环
oneScaleAnimator.setRepeatCount(ValueAnimator.INFINITE);
//第一个小球位移动画,通过改变小球的圆心
ValueAnimator oneCenterAnimator = ValueAnimator.ofFloat(-1, 0, 1, 0, -1);
oneCenterAnimator.setRepeatCount(ValueAnimator.INFINITE);
oneCenterAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
float value = (Float) animation.getAnimatedValue();
float x = mCenterX + (distance) * value;
mOneBall.setCenterX(x);
//不停的刷新view,让view不停的重绘
invalidate();
}
});
//第二个小球缩放动画
//变化规律:中间大小->最小->中间大小->最大->中间大小
ObjectAnimator twoScaleAnimator = ObjectAnimator.ofFloat(mTwoBall, "radius", centerRadius, minRadius,
centerRadius, maxRadius, centerRadius);
twoScaleAnimator.setRepeatCount(ValueAnimator.INFINITE);
//第二个小球位移动画
ValueAnimator twoCenterAnimator = ValueAnimator.ofFloat(1, 0, -1, 0, 1);
twoCenterAnimator.setRepeatCount(ValueAnimator.INFINITE);
twoCenterAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
float value = (Float) animation.getAnimatedValue();
float x = mCenterX + (distance) * value;
mTwoBall.setCenterX(x);
}
});
//属性动画集合
animatorSet = new AnimatorSet();
//四个属性动画一块执行
animatorSet.playTogether(oneScaleAnimator, oneCenterAnimator, twoScaleAnimator, twoCenterAnimator);
//动画一次运行时间
animatorSet.setDuration(DEFAULT_ANIMATOR_DURATION);
//时间插值器,这里表示动画开始最快,结尾最慢
animatorSet.setInterpolator(new DecelerateInterpolator());
}
/**
* 小球
*/
public class Ball {
@Keep
private float radius;//半径
private float centerX;//圆心
private int color;//颜色
@Keep
public float getRadius() {
return radius;
}
@Keep
public void setRadius(float radius) {
this.radius = radius;
}
public float getCenterX() {
return centerX;
}
public void setCenterX(float centerX) {
this.centerX = centerX;
}
public int getColor() {
return color;
}
public void setColor(int color) {
this.color = color;
}
}
@Override
public void setVisibility(int v) {
if (getVisibility() != v) {
super.setVisibility(v);
if (v == GONE || v == INVISIBLE) {
stopAnimator();
} else {
startAnimator();
}
}
}
@Override
protected void onVisibilityChanged(View changedView, int v) {
super.onVisibilityChanged(changedView, v);
if (v == GONE || v == INVISIBLE) {
stopAnimator();
} else {
startAnimator();
}
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
startAnimator();
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
stopAnimator();
}
/**
* 设置第一个球的颜色
*
* @param color
*/
public void setOneBallColor(@ColorInt int color) {
mOneBall.setColor(color);
}
/**
* 设置第二个球的颜色
*
* @param color
*/
public void setmTwoBallColor(@ColorInt int color) {
mTwoBall.setColor(color);
}
/**
* 设置球的最大半径
*
* @param maxRadius
*/
public void setMaxRadius(float maxRadius) {
this.maxRadius = maxRadius;
configAnimator();
}
/**
* 设置球的最小半径
*
* @param minRadius
*/
public void setMinRadius(float minRadius) {
this.minRadius = minRadius;
configAnimator();
}
/**
* 设置两个球旋转的最大范围距离
*
* @param distance
*/
public void setDistance(int distance) {
this.distance = distance;
}
public void setDuration(long duration) {
this.duration = duration;
if (animatorSet != null) {
animatorSet.setDuration(duration);
}
}
/**
* 开始动画
*/
public void startAnimator() {
if (getVisibility() != VISIBLE) return;
if (animatorSet.isRunning()) return;
if (animatorSet != null) {
animatorSet.start();
}
}
/**
* 结束停止动画
*/
public void stopAnimator() {
if (animatorSet != null) {
animatorSet.end();
}
}
}
这里需要注意一个地方,因为我们用到了属性动画,在这里:
//第一个小球缩放动画,通过改变小球的半径
//半径变化规律:中间大小->最大->中间大小->最小->中间大小
ObjectAnimator oneScaleAnimator = ObjectAnimator.ofFloat(mOneBall, "radius",
centerRadius, maxRadius, centerRadius, minRadius, centerRadius);
其中radius是我们定义的Ball对象的半径属性,这个在混淆的时候会有问题,我们在这里把有关radius都@Keep掉,不让proguard混淆
/**
* 小球
*/
public class Ball {
//防止混淆
@Keep
private float radius;//半径
private float centerX;//圆心
private int color;//颜色
//防止混淆
@Keep
public float getRadius() {
return radius;
}
//防止混淆
@Keep
public void setRadius(float radius) {
this.radius = radius;
}
public float getCenterX() {
return centerX;
}
public void setCenterX(float centerX) {
this.centerX = centerX;
}
public int getColor() {
return color;
}
public void setColor(int color) {
this.color = color;
}
}
但是目前Gradle没有启动这个插件,所以需要我们手动开启@Keep
五、开始@Keep防止混淆注解
在app/proguard-rules.pro里面添加
#手动启用support keep注解
#http://tools.android.com/tech-docs/support-annotations
-keep,allowobfuscation @interface android.support.annotation.Keep
-keep @android.support.annotation.Keep class *
-keepclassmembers class * {
@android.support.annotation.Keep *;
}
这样就实现了一个清新的两球绕中心滚动的进度条了!
最后附上源码下载地址:github-TwoBallRotationProgressBar
版权声明:本文为博主原创文章,未经博主允许不得转载。
时间: 2024-10-11 02:11:55