本文实例为大家分享了Android自定义加载圈动画展示的具体代码，供大家参考，具体内容如下

实现如下效果:

该效果图主要有3个动画:

1.旋转动画

2.聚合动画

3.扩散动画

以上3个动画都是通过ValueAnimator来实现,配合自定义View的onDraw()方法实现不断的刷新和绘制界面.

具体代码如下:

package blog.csdn.net.mchenys.myanimationloading;

import android.animation.Animator;

import android.animation.AnimatorListenerAdapter;

import android.animation.ValueAnimator;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.PointF;

import android.util.AttributeSet;

import android.view.View;

import android.view.animation.LinearInterpolator;

import android.view.animation.OvershootInterpolator;

/**

* Created by mChenys on 2016/5/21.

*/

public class AnimationLoading extends View {

private float mBigCircleRaduis = 90;//大圆的半径

private float mSubCircleRadius = 20;//小圆的半径

private PointF mBigCenterPoint;//大圆的圆心坐标

private Paint mBgPaint;//绘制背景的画笔

private Paint mFgPaint;//绘制前景色的画笔

private AnimatorTemplet mTemplet;//动画模板

float mBigCircleRotateAngle;//大圆旋转的角度

float mDiagonalDist;//屏幕对角线一半的距离

float mBgStrokeCircleRadius;//用于作为绘制背景空心圆的半径

//6个小圆的颜色

private int[] colors = new int[]{Color.RED, Color.DKGRAY, Color.YELLOW, Color.BLUE, Color.LTGRAY, Color.GREEN};

public AnimationLoading(Context context) {

this(context, null);

}

public AnimationLoading(Context context, AttributeSet attrs) {

super(context, attrs);

init();

}

@Override

protected void onSizeChanged(int w, int h, int oldw, int oldh) {

super.onSizeChanged(w, h, oldw, oldh);

//确定大圆的圆心坐标

mBigCenterPoint.x = w / 2f;

mBigCenterPoint.y = h / 2f;

//屏幕对角线的一半

mDiagonalDist = (float) (Math.sqrt(w * w + h * h) / 2);

}

private void init() {

mBigCenterPoint = new PointF();

mFgPaint = new Paint();

mFgPaint.setAntiAlias(true);

mBgPaint = new Paint(mFgPaint);

mBgPaint.setColor(Color.WHITE);

mBgPaint.setStyle(Paint.Style.STROKE);

}

@Override

protected void onDraw(Canvas canvas) {

if (null == mTemplet) {

//开启旋转动画

mTemplet = new RotateState();

}

//传递Canvas对象

mTemplet.drawState(canvas);

}

/**

* 绘制圆

*

* @param canvas

*/

private void drawCircle(Canvas canvas) {

//获取每个小圆间隔的角度

float rotateAngle = (float) (2 * Math.PI / colors.length);

for (int i = 0; i < colors.length; i++) {

//每个小圆的实际角度

double angle = rotateAngle * i + mBigCircleRotateAngle; //这里加上大圆旋转的角度是为了带动小圆一起旋转

//计算每个小圆的圆心坐标

float cx = (float) (mBigCircleRaduis * Math.cos(angle)) + mBigCenterPoint.x;

float cy = (float) (mBigCircleRaduis * Math.sin(angle)) + mBigCenterPoint.y;

//绘制6个小圆

mFgPaint.setColor(colors[i]);

canvas.drawCircle(cx, cy, mSubCircleRadius, mFgPaint);

}

}

/**

* 绘制背景

*

* @param canvas

*/

private void drawBackground(Canvas canvas) {

if (mBgStrokeCircleRadius > 0f) {

//不断扩散的空心圆,空心圆的半径为屏幕对角线的一半,空心圆的线宽则从线宽一半到0

float strokeWidth = mDiagonalDist - mBgStrokeCircleRadius;//线宽从对角线的1/2 ~ 0

mBgPaint.setStrokeWidth(strokeWidth);

float radius = mBgStrokeCircleRadius + strokeWidth / 2;//半径从对角线的1/4 ~ 1/2

canvas.drawCircle(mBigCenterPoint.x, mBigCenterPoint.y,radius , mBgPaint);

} else {

//绘制白色背景

canvas.drawColor(Color.WHITE);

}

}

private abstract class AnimatorTemplet {

abstract void drawState(Canvas canvas);

}

/**

* 绘制旋转动画

*/

private class RotateState extends AnimatorTemplet {

ValueAnimator mValueAnimator;

public RotateState() {

//旋转的过程,就是不断的获取大圆的角度,从0-2π

mValueAnimator = ValueAnimator.ofFloat(0, (float) Math.PI * 2);

mValueAnimator.setInterpolator(new LinearInterpolator());//匀速插值器

mValueAnimator.setDuration(1200);

mValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

@Override

public void onAnimationUpdate(ValueAnimator animation) {

//获取大圆旋转的角度

mBigCircleRotateAngle = (float) animation.getAnimatedValue();

//重绘

invalidate();

}

});

mValueAnimator.setRepeatCount(ValueAnimator.INFINITE);//无限循环

mValueAnimator.start();

}

/**

* 停止旋转动画,在数据加载完毕后供外部调用

*/

public void stopRotate() {

mValueAnimator.cancel();

}

@Override

void drawState(Canvas canvas) {

drawBackground(canvas);

drawCircle(canvas);

}

}

/**

* 绘制聚合动画

*/

private class MergingState extends AnimatorTemplet {

public MergingState() {

//聚合的过程,就是不断的改变大圆的半径,从mBigCircleRaduis~0

ValueAnimator valueAnimator = ValueAnimator.ofFloat(mBigCircleRaduis, 0);

valueAnimator.setInterpolator(new OvershootInterpolator(10f));//弹性插值器

valueAnimator.setDuration(600);

valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

@Override

public void onAnimationUpdate(ValueAnimator animation) {

//获取大圆变化的半径

mBigCircleRaduis = (float) animation.getAnimatedValue();

//重绘

invalidate();

}

});

valueAnimator.addListener(new AnimatorListenerAdapter() {

@Override

public void onAnimationEnd(Animator animation) {

//聚合执行完后进入下一个扩散动画

mTemplet = new SpreadState();

}

});

valueAnimator.start();

}

@Override

void drawState(Canvas canvas) {

drawBackground(canvas);

drawCircle(canvas);

}

}

/**

* 绘制扩散动画

*/

private class SpreadState extends AnimatorTemplet {

public SpreadState() {

//扩散的过程,就是不断的改变背景画绘制空心圆的半径,从0~mDiagonalDist

ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, mDiagonalDist);

valueAnimator.setDuration(600);

valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

@Override

public void onAnimationUpdate(ValueAnimator animation) {

//获取大圆变化的半径

mBgStrokeCircleRadius = (float) animation.getAnimatedValue();

//重绘

invalidate();

}

});

valueAnimator.start();

}

@Override

void drawState(Canvas canvas) {

drawBackground(canvas);

}

}

/**

* 停止加载动画

*/

public void stopLoading() {

if (null != mTemplet && mTemplet instanceof RotateState) {

((RotateState) mTemplet).stopRotate();

//开启下一个聚合动画

post(new Runnable() {

@Override

public void run() {

mTemplet = new MergingState();

}

});

}

}

}

测试的Activity

package blog.csdn.net.mchenys.myanimationloading;

import android.os.Bundle;

import android.os.Handler;

import android.support.v7.app.AppCompatActivity;

import android.widget.FrameLayout;

import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

FrameLayout content = new FrameLayout(this);

content.setOnClickListener(null);

ImageView bg = new ImageView(this);

bg.setImageResource(R.drawable.fg);

bg.setScaleType(ImageView.ScaleType.FIT_XY);

content.addView(bg);

final AnimationLoading loading = new AnimationLoading(this);

content.addView(loading);

setContentView(content);

new Handler().postDelayed(new Runnable() {

@Override

public void run() {

//3s后停止加载动画

loading.stopLoading();

}

},3000);

}

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。