一个绚丽的loading动效分析与实现!

时间:2021-02-03 15:46:47

最终效果如下

一个绚丽的loading动效分析与实现!

从效果上看,我们需要考虑以下几个问题:

1.叶子的随机产生;

2.叶子随着一条正余弦曲线移动;

3.叶子在移动的时候旋转,旋转方向随机,正时针或逆时针;

4.叶子遇到进度条,似乎是融合进入;

5.叶子不能超出最左边的弧角;

7.叶子飘出时的角度不是一致,走的曲线的振幅也有差别,否则太有规律性,缺乏美感;

总的看起来,需要注意和麻烦的地方主要是以上几点,当然还有一些细节问题,比如最左边是圆弧等等;

那接下来我们将效果进行分解,然后逐个击破:

整个效果来说,我们需要的图主要是飞动的小叶子和右边旋转的风扇,其他的部分都可以用色值进行绘制,当然我们为了方便,就连底部框一起切了;

先从gif 图里把飞动的小叶子和右边旋转的风扇、底部框抠出来,小叶子图如下:

一个绚丽的loading动效分析与实现!

我们需要处理的主要有两个部分:

1. 随着进度往前绘制的进度条;

2. 不断飞出来的小叶片;

我们先处理第一部分 - 随着进度往前绘制的进度条:

进度条的位置根据外层传入的 progress 进行计算,可以分为图中 1、2、3 三个阶段:

一个绚丽的loading动效分析与实现!

  1. 当progress 较小,算出的当前距离还在弧形以内时,需要绘制如图所示 1 区域的弧形,其余部分用白色填充;
  2. 当 progress 算出的距离到2时,需要绘制棕色半圆弧形,其余部分用白色矩形填充;
  3. 当 progress 算出的距离到3 时,需要绘制棕色半圆弧形,棕色矩形,白色矩形;
  4. 当 progress 算出的距离到头时,需要绘制棕色半圆弧形,棕色矩形;(可以合并到3中)

首先根据进度条的宽度和当前进度、总进度算出当前的位置:

//mProgressWidth为进度条的宽度,根据当前进度算出进度条的位置
mCurrentProgressPosition = mProgressWidth * mProgress / TOTAL_PROGRESS;

然后按照上面的逻辑进行绘制,其中需要计算上图中的红色弧角角度,计算方法如下:

// 单边角度
int angle = (int) Math.toDegrees(Math.acos((mArcRadius - mCurrentProgressPosition)/ (float) mArcRadius));

Math.acos() -反余弦函数;

Math.toDegrees() - 弧度转化为角度,Math.toRadians 角度转化为弧度

所以圆弧的起始点为:

int startAngle = 180 - angle;  

圆弧划过的角度为:2 * angle

这一块的代码如下:

// mProgressWidth为进度条的宽度,根据当前进度算出进度条的位置
mCurrentProgressPosition = mProgressWidth * mProgress / TOTAL_PROGRESS;
// 即当前位置在图中所示1范围内
if (mCurrentProgressPosition < mArcRadius) {
Log.i(TAG, "mProgress = " + mProgress + "---mCurrentProgressPosition = "
+ mCurrentProgressPosition
+ "--mArcProgressWidth" + mArcRadius);
// 1.绘制白色ARC,绘制orange ARC
// 2.绘制白色矩形 // 1.绘制白色ARC
canvas.drawArc(mArcRectF, 90, 180, false, mWhitePaint); // 2.绘制白色矩形
mWhiteRectF.left = mArcRightLocation;
canvas.drawRect(mWhiteRectF, mWhitePaint); // 3.绘制棕色 ARC
// 单边角度
int angle = (int) Math.toDegrees(Math.acos((mArcRadius - mCurrentProgressPosition)
/ (float) mArcRadius));
// 起始的位置
int startAngle = 180 - angle;
// 扫过的角度
int sweepAngle = 2 * angle;
Log.i(TAG, "startAngle = " + startAngle);
canvas.drawArc(mArcRectF, startAngle, sweepAngle, false, mOrangePaint);
} else {
Log.i(TAG, "mProgress = " + mProgress + "---transfer-----mCurrentProgressPosition = "
+ mCurrentProgressPosition
+ "--mArcProgressWidth" + mArcRadius);
// 1.绘制white RECT
// 2.绘制Orange ARC
// 3.绘制orange RECT // 1.绘制white RECT
mWhiteRectF.left = mCurrentProgressPosition;
canvas.drawRect(mWhiteRectF, mWhitePaint); // 2.绘制Orange ARC
canvas.drawArc(mArcRectF, 90, 180, false, mOrangePaint);
// 3.绘制orange RECT
mOrangeRectF.left = mArcRightLocation;
mOrangeRectF.right = mCurrentProgressPosition;
canvas.drawRect(mOrangeRectF, mOrangePaint); }

叶子部分

首先根据效果情况基本确定出 曲线函数,标准函数方程为:y = A(wx+Q)+h,其中w影响周期,A影响振幅 ,周期T= 2 * Math.PI/w;

根据效果可以看出,周期大致为总进度长度,所以确定w=(float) ((float) 2 * Math.PI /mProgressWidth);

仔细观察效果,我们可以发现,叶子飘动的过程中振幅不是完全一致的,产生一种错落的效果,既然如此,我们给叶子定义一个Type,根据Type 确定不同的振幅;

我们创建一个叶子对象:

private class Leaf {  

     // 在绘制部分的位置
float x, y;
// 控制叶子飘动的幅度
StartType type;
// 旋转角度
int rotateAngle;
// 旋转方向--0代表顺时针,1代表逆时针
int rotateDirection;
// 起始时间(ms)
long startTime;
}

类型采用枚举进行定义,其实就是用来区分不同的振幅:

private enum StartType {
LITTLE, MIDDLE, BIG
}

创建一个LeafFactory类用于创建一个或多个叶子信息:

private class LeafFactory {
private static final int MAX_LEAFS = 6;
Random random = new Random(); // 生成一个叶子信息
public Leaf generateLeaf() {
Leaf leaf = new Leaf();
int randomType = random.nextInt(3);
// 随时类型- 随机振幅
StartType type = StartType.MIDDLE;
switch (randomType) {
case 0:
break;
case 1:
type = StartType.LITTLE;
break;
case 2:
type = StartType.BIG;
break;
default:
break;
}
leaf.type = type;
// 随机起始的旋转角度
leaf.rotateAngle = random.nextInt(360);
// 随机旋转方向(顺时针或逆时针)
leaf.rotateDirection = random.nextInt(2);
// 为了产生交错的感觉,让开始的时间有一定的随机性
mAddTime += random.nextInt((int) (LEAF_FLOAT_TIME * 1.5));
leaf.startTime = System.currentTimeMillis() + mAddTime;
return leaf;
} // 根据最大叶子数产生叶子信息
public List<Leaf> generateLeafs() {
return generateLeafs(MAX_LEAFS);
} // 根据传入的叶子数量产生叶子信息
public List<Leaf> generateLeafs(int leafSize) {
List<Leaf> leafs = new LinkedList<Leaf>();
for (int i = 0; i < leafSize; i++) {
leafs.add(generateLeaf());
}
return leafs;
}

定义两个常亮分别记录中等振幅和之间的振幅差:

// 中等振幅大小
private static final int MIDDLE_AMPLITUDE = 13;
// 不同类型之间的振幅差距
private static final int AMPLITUDE_DISPARITY = 5;
// 中等振幅大小
private int mMiddleAmplitude = MIDDLE_AMPLITUDE;
// 振幅差
private int mAmplitudeDisparity = AMPLITUDE_DISPARITY;

有了以上信息,我们则可以获取到叶子的Y值:

// 通过叶子信息获取当前叶子的Y值
private int getLocationY(Leaf leaf) {
// y = A(wx+Q)+h
float w = (float) ((float) 2 * Math.PI / mProgressWidth);
float a = mMiddleAmplitude;
switch (leaf.type) {
case LITTLE:
// 小振幅 = 中等振幅 - 振幅差
a = mMiddleAmplitude - mAmplitudeDisparity;
break;
case MIDDLE:
a = mMiddleAmplitude;
break;
case BIG:
// 小振幅 = 中等振幅 + 振幅差
a = mMiddleAmplitude + mAmplitudeDisparity;
break;
default:
break;
}
Log.i(TAG, "---a = " + a + "---w = " + w + "--leaf.x = " + leaf.x);
return (int) (a * Math.sin(w * leaf.x)) + mArcRadius * 2 / 3;
}

绘制叶子

/**
* 绘制叶子
*
* @param canvas
*/
private void drawLeafs(Canvas canvas) {
long currentTime = System.currentTimeMillis();
for (int i = 0; i < mLeafInfos.size(); i++) {
Leaf leaf = mLeafInfos.get(i);
if (currentTime > leaf.startTime && leaf.startTime != 0) {
// 绘制叶子--根据叶子的类型和当前时间得出叶子的(x,y)
getLeafLocation(leaf, currentTime);
// 根据时间计算旋转角度
canvas.save();
// 通过Matrix控制叶子旋转
Matrix matrix = new Matrix();
float transX = mLeftMargin + leaf.x;
float transY = mLeftMargin + leaf.y;
Log.i(TAG, "left.x = " + leaf.x + "--leaf.y=" + leaf.y);
matrix.postTranslate(transX, transY);
// 通过时间关联旋转角度,则可以直接通过修改LEAF_ROTATE_TIME调节叶子旋转快慢
float rotateFraction = ((currentTime - leaf.startTime) % LEAF_ROTATE_TIME)
/ (float) LEAF_ROTATE_TIME;
int angle = (int) (rotateFraction * 360);
// 根据叶子旋转方向确定叶子旋转角度
int rotate = leaf.rotateDirection == 0 ? angle + leaf.rotateAngle : -angle
+ leaf.rotateAngle;
matrix.postRotate(rotate, transX
+ mLeafWidth / 2, transY + mLeafHeight / 2);
canvas.drawBitmap(mLeafBitmap, matrix, mBitmapPaint);
canvas.restore();
} else {
continue;
}
}
}

LeafLoadingView完整代码


package com.example.csdnblog4; import java.util.LinkedList;
import java.util.List;
import java.util.Random; import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View; public class LeafLoadingView extends View { private static final String TAG = "LeafLoadingView";
// 淡白色
private static final int WHITE_COLOR = 0xfffde399;
// 橙色
private static final int ORANGE_COLOR = 0xffffa800;
// 中等振幅大小
private static final int MIDDLE_AMPLITUDE = 13;
// 不同类型之间的振幅差距
private static final int AMPLITUDE_DISPARITY = 5; // 总进度
private static final int TOTAL_PROGRESS = 100;
// 叶子飘动一个周期所花的时间
private static final long LEAF_FLOAT_TIME = 3000;
// 叶子旋转一周需要的时间
private static final long LEAF_ROTATE_TIME = 2000; // 用于控制绘制的进度条距离左/上/下的距离
private static final int LEFT_MARGIN = 9;
// 用于控制绘制的进度条距离右的距离
private static final int RIGHT_MARGIN = 25;
private int mLeftMargin, mRightMargin;
// 中等振幅大小
private int mMiddleAmplitude = MIDDLE_AMPLITUDE;
// 振幅差
private int mAmplitudeDisparity = AMPLITUDE_DISPARITY; // 叶子飘动一个周期所花的时间
private long mLeafFloatTime = LEAF_FLOAT_TIME;
// 叶子旋转一周需要的时间
private long mLeafRotateTime = LEAF_ROTATE_TIME;
private Resources mResources;
private Bitmap mLeafBitmap;
private int mLeafWidth, mLeafHeight; private Bitmap mOuterBitmap;
private Rect mOuterSrcRect, mOuterDestRect;
private int mOuterWidth, mOuterHeight; private int mTotalWidth, mTotalHeight; private Paint mBitmapPaint, mWhitePaint, mOrangePaint;
private RectF mWhiteRectF, mOrangeRectF, mArcRectF;
// 当前进度
private int mProgress;
// 所绘制的进度条部分的宽度
private int mProgressWidth;
// 当前所在的绘制的进度条的位置
private int mCurrentProgressPosition;
// 弧形的半径
private int mArcRadius; // arc的右上角的x坐标,也是矩形x坐标的起始点
private int mArcRightLocation;
// 用于产生叶子信息
private LeafFactory mLeafFactory;
// 产生出的叶子信息
private List<Leaf> mLeafInfos;
// 用于控制随机增加的时间不抱团
private int mAddTime; public LeafLoadingView(Context context, AttributeSet attrs) {
super(context, attrs);
mResources = getResources();
mLeftMargin = UiUtils.dipToPx(context, LEFT_MARGIN);
mRightMargin = UiUtils.dipToPx(context, RIGHT_MARGIN); mLeafFloatTime = LEAF_FLOAT_TIME;
mLeafRotateTime = LEAF_ROTATE_TIME; initBitmap();
initPaint();
mLeafFactory = new LeafFactory();
mLeafInfos = mLeafFactory.generateLeafs(); } private void initPaint() {
mBitmapPaint = new Paint();
mBitmapPaint.setAntiAlias(true);
mBitmapPaint.setDither(true);
mBitmapPaint.setFilterBitmap(true); mWhitePaint = new Paint();
mWhitePaint.setAntiAlias(true);
mWhitePaint.setColor(WHITE_COLOR); mOrangePaint = new Paint();
mOrangePaint.setAntiAlias(true);
mOrangePaint.setColor(ORANGE_COLOR); } @Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas); // 绘制进度条和叶子
// 之所以把叶子放在进度条里绘制,主要是层级原因
drawProgressAndLeafs(canvas);
// drawLeafs(canvas); canvas.drawBitmap(mOuterBitmap, mOuterSrcRect, mOuterDestRect, mBitmapPaint); postInvalidate();
} private void drawProgressAndLeafs(Canvas canvas) { if (mProgress >= TOTAL_PROGRESS) {
mProgress = 0;
}
// mProgressWidth为进度条的宽度,根据当前进度算出进度条的位置
mCurrentProgressPosition = mProgressWidth * mProgress / TOTAL_PROGRESS;
// 即当前位置在图中所示1范围内
if (mCurrentProgressPosition < mArcRadius) {
Log.i(TAG, "mProgress = " + mProgress + "---mCurrentProgressPosition = "
+ mCurrentProgressPosition
+ "--mArcProgressWidth" + mArcRadius);
// 1.绘制白色ARC,绘制orange ARC
// 2.绘制白色矩形 // 1.绘制白色ARC
canvas.drawArc(mArcRectF, 90, 180, false, mWhitePaint); // 2.绘制白色矩形
mWhiteRectF.left = mArcRightLocation;
canvas.drawRect(mWhiteRectF, mWhitePaint); // 绘制叶子
drawLeafs(canvas); // 3.绘制棕色 ARC
// 单边角度
int angle = (int) Math.toDegrees(Math.acos((mArcRadius - mCurrentProgressPosition)
/ (float) mArcRadius));
// 起始的位置
int startAngle = 180 - angle; // 扫过的角度
int sweepAngle = 2 * angle; canvas.drawArc(mArcRectF, startAngle, sweepAngle, false, mOrangePaint);
} else {
Log.i(TAG, "mProgress = " + mProgress + "---transfer-----mCurrentProgressPosition = "
+ mCurrentProgressPosition
+ "--mArcProgressWidth" + mArcRadius);
// 1.绘制white RECT
// 2.绘制Orange ARC
// 3.绘制orange RECT
// 这个层级进行绘制能让叶子感觉是融入棕色进度条中 // 1.绘制white RECT
mWhiteRectF.left = mCurrentProgressPosition;
canvas.drawRect(mWhiteRectF, mWhitePaint);
// 绘制叶子
drawLeafs(canvas);
// 2.绘制Orange ARC
canvas.drawArc(mArcRectF, 90, 180, false, mOrangePaint);
// 3.绘制orange RECT
mOrangeRectF.left = mArcRightLocation;
mOrangeRectF.right = mCurrentProgressPosition;
canvas.drawRect(mOrangeRectF, mOrangePaint); } } /**
* 绘制叶子
*
* @param canvas
*/
private void drawLeafs(Canvas canvas) {
mLeafRotateTime = mLeafRotateTime <= 0 ? LEAF_ROTATE_TIME : mLeafRotateTime;
long currentTime = System.currentTimeMillis();
for (int i = 0; i < mLeafInfos.size(); i++) {
Leaf leaf = mLeafInfos.get(i);
if (currentTime > leaf.startTime && leaf.startTime != 0) {
// 绘制叶子--根据叶子的类型和当前时间得出叶子的(x,y)
getLeafLocation(leaf, currentTime);
// 根据时间计算旋转角度
canvas.save();
// 通过Matrix控制叶子旋转
Matrix matrix = new Matrix();
float transX = mLeftMargin + leaf.x;
float transY = mLeftMargin + leaf.y;
Log.i(TAG, "left.x = " + leaf.x + "--leaf.y=" + leaf.y);
matrix.postTranslate(transX, transY);
// 通过时间关联旋转角度,则可以直接通过修改LEAF_ROTATE_TIME调节叶子旋转快慢
float rotateFraction = ((currentTime - leaf.startTime) % mLeafRotateTime)
/ (float) mLeafRotateTime;
int angle = (int) (rotateFraction * 360);
// 根据叶子旋转方向确定叶子旋转角度
int rotate = leaf.rotateDirection == 0 ? angle + leaf.rotateAngle : -angle
+ leaf.rotateAngle;
matrix.postRotate(rotate, transX
+ mLeafWidth / 2, transY + mLeafHeight / 2);
canvas.drawBitmap(mLeafBitmap, matrix, mBitmapPaint);
canvas.restore();
} else {
continue;
}
}
} private void getLeafLocation(Leaf leaf, long currentTime) {
long intervalTime = currentTime - leaf.startTime;
mLeafFloatTime = mLeafFloatTime <= 0 ? LEAF_FLOAT_TIME : mLeafFloatTime;
if (intervalTime < 0) {
return;
} else if (intervalTime > mLeafFloatTime) {
leaf.startTime = System.currentTimeMillis()
+ new Random().nextInt((int) mLeafFloatTime);
} float fraction = (float) intervalTime / mLeafFloatTime;
leaf.x = (int) (mProgressWidth - mProgressWidth * fraction);
leaf.y = getLocationY(leaf);
} // 通过叶子信息获取当前叶子的Y值
private int getLocationY(Leaf leaf) {
// y = A(wx+Q)+h
float w = (float) ((float) 2 * Math.PI / mProgressWidth);
float a = mMiddleAmplitude;
switch (leaf.type) {
case LITTLE:
// 小振幅 = 中等振幅 - 振幅差
a = mMiddleAmplitude - mAmplitudeDisparity;
break;
case MIDDLE:
a = mMiddleAmplitude;
break;
case BIG:
// 小振幅 = 中等振幅 + 振幅差
a = mMiddleAmplitude + mAmplitudeDisparity;
break;
default:
break;
}
Log.i(TAG, "---a = " + a + "---w = " + w + "--leaf.x = " + leaf.x);
return (int) (a * Math.sin(w * leaf.x)) + mArcRadius * 2 / 3;
} @Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec); Log.i("test", "widthMeasureSpec=="+MeasureSpec.getSize(widthMeasureSpec)+",heightMeasureSpec=="+MeasureSpec.getSize(heightMeasureSpec));
int w=MeasureSpec.getSize(widthMeasureSpec); int h=MeasureSpec.getSize(heightMeasureSpec); mTotalWidth = w;
mTotalHeight = h; mProgressWidth = mTotalWidth - mLeftMargin - mRightMargin;
mArcRadius = (mTotalHeight - 2 * mLeftMargin) / 2; mOuterSrcRect = new Rect(0, 0, mOuterWidth, mOuterHeight);
mOuterDestRect = new Rect(0, 0, mTotalWidth, mTotalHeight); mWhiteRectF = new RectF(mLeftMargin + mCurrentProgressPosition, mLeftMargin, mTotalWidth
- mRightMargin,
mTotalHeight - mLeftMargin);
mOrangeRectF = new RectF(mLeftMargin + mArcRadius, mLeftMargin,
mCurrentProgressPosition
, mTotalHeight - mLeftMargin); mArcRectF = new RectF(mLeftMargin, mLeftMargin, mLeftMargin + 2 * mArcRadius,
mTotalHeight - mLeftMargin);
mArcRightLocation = mLeftMargin + mArcRadius; } private void initBitmap() {
mLeafBitmap = ((BitmapDrawable) mResources.getDrawable(R.drawable.leaf)).getBitmap();
mLeafWidth = mLeafBitmap.getWidth();
mLeafHeight = mLeafBitmap.getHeight(); mOuterBitmap = ((BitmapDrawable) mResources.getDrawable(R.drawable.leaf_kuang)).getBitmap();
mOuterWidth = mOuterBitmap.getWidth();
mOuterHeight = mOuterBitmap.getHeight();
} /* @Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mTotalWidth = w;
mTotalHeight = h;
Log.i("test", "mTotalWidth = " + w+",mTotalHeight=="+h+"getWidth()=="+getWidth()+",getHeight"+getHeight());
mProgressWidth = mTotalWidth - mLeftMargin - mRightMargin;
mArcRadius = (mTotalHeight - 2 * mLeftMargin) / 2; mOuterSrcRect = new Rect(0, 0, mOuterWidth, mOuterHeight);
mOuterDestRect = new Rect(0, 0, mTotalWidth, mTotalHeight); mWhiteRectF = new RectF(mLeftMargin + mCurrentProgressPosition, mLeftMargin, mTotalWidth
- mRightMargin,
mTotalHeight - mLeftMargin);
mOrangeRectF = new RectF(mLeftMargin + mArcRadius, mLeftMargin,
mCurrentProgressPosition
, mTotalHeight - mLeftMargin); mArcRectF = new RectF(mLeftMargin, mLeftMargin, mLeftMargin + 2 * mArcRadius,
mTotalHeight - mLeftMargin);
mArcRightLocation = mLeftMargin + mArcRadius;
}*/ private enum StartType {
LITTLE, MIDDLE, BIG
} /**
* 叶子对象,用来记录叶子主要数据
*
* @author Ajian_Studio
*/
private class Leaf { // 在绘制部分的位置
float x, y;
// 控制叶子飘动的幅度
StartType type;
// 旋转角度
int rotateAngle;
// 旋转方向--0代表顺时针,1代表逆时针
int rotateDirection;
// 起始时间(ms)
long startTime;
} private class LeafFactory {
private static final int MAX_LEAFS = 8;
Random random = new Random(); // 生成一个叶子信息
public Leaf generateLeaf() {
Leaf leaf = new Leaf();
int randomType = random.nextInt(3);
// 随时类型- 随机振幅
StartType type = StartType.MIDDLE;
switch (randomType) {
case 0:
break;
case 1:
type = StartType.LITTLE;
break;
case 2:
type = StartType.BIG;
break;
default:
break;
}
leaf.type = type;
// 随机起始的旋转角度
leaf.rotateAngle = random.nextInt(360);
// 随机旋转方向(顺时针或逆时针)
leaf.rotateDirection = random.nextInt(2);
// 为了产生交错的感觉,让开始的时间有一定的随机性
mLeafFloatTime = mLeafFloatTime <= 0 ? LEAF_FLOAT_TIME : mLeafFloatTime;
mAddTime += random.nextInt((int) (mLeafFloatTime * 2));
leaf.startTime = System.currentTimeMillis() + mAddTime;
return leaf;
} // 根据最大叶子数产生叶子信息
public List<Leaf> generateLeafs() {
return generateLeafs(MAX_LEAFS);
} // 根据传入的叶子数量产生叶子信息
public List<Leaf> generateLeafs(int leafSize) {
List<Leaf> leafs = new LinkedList<Leaf>();
for (int i = 0; i < leafSize; i++) {
leafs.add(generateLeaf());
}
return leafs;
}
} /**
* 设置中等振幅
*
* @param amplitude
*/
public void setMiddleAmplitude(int amplitude) {
this.mMiddleAmplitude = amplitude;
} /**
* 设置振幅差
*
* @param disparity
*/
public void setMplitudeDisparity(int disparity) {
this.mAmplitudeDisparity = disparity;
} /**
* 获取中等振幅
*
* @param amplitude
*/
public int getMiddleAmplitude() {
return mMiddleAmplitude;
} /**
* 获取振幅差
*
* @param disparity
*/
public int getMplitudeDisparity() {
return mAmplitudeDisparity;
} /**
* 设置进度
*
* @param progress
*/
public void setProgress(int progress) {
this.mProgress = progress;
postInvalidate();
} /**
* 设置叶子飘完一个周期所花的时间
*
* @param time
*/
public void setLeafFloatTime(long time) {
this.mLeafFloatTime = time;
} /**
* 设置叶子旋转一周所花的时间
*
* @param time
*/
public void setLeafRotateTime(long time) {
this.mLeafRotateTime = time;
} /**
* 获取叶子飘完一个周期所花的时间
*/
public long getLeafFloatTime() {
mLeafFloatTime = mLeafFloatTime == 0 ? LEAF_FLOAT_TIME : mLeafFloatTime;
return mLeafFloatTime;
} /**
* 获取叶子旋转一周所花的时间
*/
public long getLeafRotateTime() {
mLeafRotateTime = mLeafRotateTime == 0 ? LEAF_ROTATE_TIME : mLeafRotateTime;
return mLeafRotateTime;
}
}

activity


package com.example.csdnblog4; import java.util.Random; import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView; public class LeafLoadingActivity extends Activity implements OnSeekBarChangeListener,
OnClickListener { Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case REFRESH_PROGRESS:
if (mProgress < 40) {
mProgress += 1;
// 随机800ms以内刷新一次
mHandler.sendEmptyMessageDelayed(REFRESH_PROGRESS,
new Random().nextInt(800));
mLeafLoadingView.setProgress(mProgress);
} else {
mProgress += 1;
// 随机1200ms以内刷新一次
mHandler.sendEmptyMessageDelayed(REFRESH_PROGRESS,
new Random().nextInt(1200));
mLeafLoadingView.setProgress(mProgress); }
break; default:
break;
}
};
}; private static final int REFRESH_PROGRESS = 0x10;
private LeafLoadingView mLeafLoadingView;
private SeekBar mAmpireSeekBar;
private SeekBar mDistanceSeekBar;
private TextView mMplitudeText;
private TextView mDisparityText;
private View mFanView;
private Button mClearButton;
private int mProgress = 0; private TextView mProgressText;
private View mAddProgress;
private SeekBar mFloatTimeSeekBar; private SeekBar mRotateTimeSeekBar;
private TextView mFloatTimeText;
private TextView mRotateTimeText; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.leaf_loading_layout);
initViews();
mHandler.sendEmptyMessageDelayed(REFRESH_PROGRESS, 3000);
} private void initViews() {
mFanView = findViewById(R.id.fan_pic);
RotateAnimation rotateAnimation = AnimationUtils.initRotateAnimation(false, 1500, true,
Animation.INFINITE);
mFanView.startAnimation(rotateAnimation);
mClearButton = (Button) findViewById(R.id.clear_progress);
mClearButton.setOnClickListener(this); mLeafLoadingView = (LeafLoadingView) findViewById(R.id.leaf_loading);
mMplitudeText = (TextView) findViewById(R.id.text_ampair);
mMplitudeText.setText(getString(R.string.current_mplitude,
mLeafLoadingView.getMiddleAmplitude())); mDisparityText = (TextView) findViewById(R.id.text_disparity);
mDisparityText.setText(getString(R.string.current_Disparity,
mLeafLoadingView.getMplitudeDisparity())); mAmpireSeekBar = (SeekBar) findViewById(R.id.seekBar_ampair);
mAmpireSeekBar.setOnSeekBarChangeListener(this);
mAmpireSeekBar.setProgress(mLeafLoadingView.getMiddleAmplitude());
mAmpireSeekBar.setMax(50); mDistanceSeekBar = (SeekBar) findViewById(R.id.seekBar_distance);
mDistanceSeekBar.setOnSeekBarChangeListener(this);
mDistanceSeekBar.setProgress(mLeafLoadingView.getMplitudeDisparity());
mDistanceSeekBar.setMax(20); mAddProgress = findViewById(R.id.add_progress);
mAddProgress.setOnClickListener(this);
mProgressText = (TextView) findViewById(R.id.text_progress); mFloatTimeText = (TextView) findViewById(R.id.text_float_time);
mFloatTimeSeekBar = (SeekBar) findViewById(R.id.seekBar_float_time);
mFloatTimeSeekBar.setOnSeekBarChangeListener(this);
mFloatTimeSeekBar.setMax(5000);
mFloatTimeSeekBar.setProgress((int) mLeafLoadingView.getLeafFloatTime());
mFloatTimeText.setText(getResources().getString(R.string.current_float_time,
mLeafLoadingView.getLeafFloatTime())); mRotateTimeText = (TextView) findViewById(R.id.text_rotate_time);
mRotateTimeSeekBar = (SeekBar) findViewById(R.id.seekBar_rotate_time);
mRotateTimeSeekBar.setOnSeekBarChangeListener(this);
mRotateTimeSeekBar.setMax(5000);
mRotateTimeSeekBar.setProgress((int) mLeafLoadingView.getLeafRotateTime());
mRotateTimeText.setText(getResources().getString(R.string.current_float_time,
mLeafLoadingView.getLeafRotateTime()));
} @Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if (seekBar == mAmpireSeekBar) {
mLeafLoadingView.setMiddleAmplitude(progress);
mMplitudeText.setText(getString(R.string.current_mplitude,
progress));
} else if (seekBar == mDistanceSeekBar) {
mLeafLoadingView.setMplitudeDisparity(progress);
mDisparityText.setText(getString(R.string.current_Disparity,
progress));
} else if (seekBar == mFloatTimeSeekBar) {
mLeafLoadingView.setLeafFloatTime(progress);
mFloatTimeText.setText(getResources().getString(R.string.current_float_time,
progress));
}
else if (seekBar == mRotateTimeSeekBar) {
mLeafLoadingView.setLeafRotateTime(progress);
mRotateTimeText.setText(getResources().getString(R.string.current_rotate_time,
progress));
} } @Override
public void onStartTrackingTouch(SeekBar seekBar) { } @Override
public void onStopTrackingTouch(SeekBar seekBar) { } @Override
public void onClick(View v) {
if (v == mClearButton) {
mLeafLoadingView.setProgress(0);
mHandler.removeCallbacksAndMessages(null);
mProgress = 0;
} else if (v == mAddProgress) {
mProgress++;
mLeafLoadingView.setProgress(mProgress);
mProgressText.setText(String.valueOf(mProgress));
}
}
}

layout

<?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"
android:background="#fed255"
android:orientation="vertical" > <TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="100dp"
android:text="loading ..."
android:textColor="#FFA800"
android:textSize=" 30dp" /> <RelativeLayout
android:id="@+id/leaf_content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp" > <com.example.csdnblog4.LeafLoadingView
android:id="@+id/leaf_loading"
android:layout_width="302dp"
android:layout_height="61dp"
android:layout_centerHorizontal="true" /> <ImageView
android:id="@+id/fan_pic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="35dp"
android:src="@drawable/fengshan" />
</RelativeLayout> <ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent" > <LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" > <LinearLayout
android:id="@+id/seek_content_one"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:layout_marginTop="15dp" > <TextView
android:id="@+id/text_ampair"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:textColor="#ffffa800"
android:textSize="15dp" /> <SeekBar
android:id="@+id/seekBar_ampair"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_weight="1" />
</LinearLayout> <LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:layout_marginTop="15dp"
android:orientation="horizontal" > <TextView
android:id="@+id/text_disparity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:textColor="#ffffa800"
android:textSize="15dp" /> <SeekBar
android:id="@+id/seekBar_distance"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_weight="1" />
</LinearLayout> <LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:layout_marginTop="15dp"
android:orientation="horizontal" > <TextView
android:id="@+id/text_float_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:textColor="#ffffa800"
android:textSize="15dp" /> <SeekBar
android:id="@+id/seekBar_float_time"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_weight="1" />
</LinearLayout> <LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:layout_marginTop="15dp"
android:orientation="horizontal" > <TextView
android:id="@+id/text_rotate_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:textColor="#ffffa800"
android:textSize="15dp" /> <SeekBar
android:id="@+id/seekBar_rotate_time"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_weight="1" />
</LinearLayout> <Button
android:id="@+id/clear_progress"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="去除进度条,玩转弧线"
android:textSize="18dp" /> <LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:layout_marginTop="15dp"
android:orientation="horizontal" > <Button
android:id="@+id/add_progress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="增加进度: "
android:textSize="18dp" /> <TextView
android:id="@+id/text_progress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:textColor="#ffffa800"
android:textSize="15dp" />
</LinearLayout>
</LinearLayout>
</ScrollView> </LinearLayout>

注意

本文中用到了onSizeChanged方法,这个方法在这是为了自适应界面,每次界面变化的时候都会被调用来重新计算一些参数,一般在刚进入与横竖屏切换时调用

参考链接

Android自定义View初步 - 泡在网上的日子

本文中还用到了postInvalidate

invalidate()和postInvalidate() 的区别及使用,

Android提供了Invalidate方法实现界面刷新,但是Invalidate不能直接在线程中调用,因为他是违背了单线程模型:Android UI操作并不是线程安全的,并且这些操作必须在UI线程中调用。

invalidate()是用来刷新View的,必须是在UI线程中进行工作。比如在修改某个view的显示时,调用invalidate()才能看到重新绘制的界面。invalidate()的调用是把之前的旧的view从主UI线程队列中pop掉。 一个Android 程序默认情况下也只有一个进程,但一个进程下却可以有许多个线程。

在这么多线程当中,把主要是负责控制UI界面的显示、更新和控件交互的线程称为UI线程,由于onCreate()方法是由UI线程执行的,所以也可以把UI线程理解为主线程。其余的线程可以理解为工作者线程。

invalidate()得在UI线程中被调动,在工作者线程中可以通过Handler来通知UI线程进行界面更新。

而postInvalidate()在工作者线程中被调用

参考链接

Android笔记:invalidate()和postInvalidate() 的区别及使用 - Mars2639——求知de路上 - 博客频道 - CSDN.NET

本文还涉及到单位的转化

参考链接

Android中dip、dp、sp、pt和px的区别 - 大气象 - 博客园

最终效果如下

一个绚丽的loading动效分析与实现!

参考链接

一个绚丽的loading动效分析与实现! - Ajian_studio - 博客频道 - CSDN.NET

源代码下载

源代码

完成