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Android實(shí)現(xiàn)雅虎新聞?wù)虞d視差動(dòng)畫(huà)效果

 更新時(shí)間：2021年08月09日 17:36:52   作者：我想月薪過(guò)萬(wàn)  
這篇文章主要介紹了Android實(shí)現(xiàn)雅虎新聞?wù)虞d視差動(dòng)畫(huà)效果,通過(guò)實(shí)例代碼給大家介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或工作具有一定的參考借鑒價(jià)值，需要的朋友可以參考下

基礎(chǔ)知識(shí)

繼 Android實(shí)現(xiàn)旋轉(zhuǎn)動(dòng)畫(huà)的兩種方式 我們了解了 Android實(shí)現(xiàn)旋轉(zhuǎn)的兩種基本方法之后，我們來(lái)寫(xiě)一個(gè)綜合案例

效果展示

代碼實(shí)現(xiàn) 

實(shí)現(xiàn)思路

從效果中我們可以看到 可以將其分為三個(gè)動(dòng)畫(huà)：

1、旋轉(zhuǎn)動(dòng)畫(huà)（Android實(shí)現(xiàn)旋轉(zhuǎn)動(dòng)畫(huà)的兩種方式）

2、聚合動(dòng)畫(huà)

3、擴(kuò)展動(dòng)畫(huà)

代碼展示

package com.wust.mydialog;
 
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
import android.view.WindowManager;
import android.view.animation.AnticipateInterpolator;
import android.view.animation.LinearInterpolator;
 
import androidx.annotation.Nullable;
 
 
/**
 * ClassName: com.wust.mydialog.MyRotateView <br/>
 * Description: <br/>
 * date: 2021/8/7 12:13<br/>
 *
 * @author yiqi<br />
 * @QQ 1820762465
 * @微信 yiqiideallife
 * @技術(shù)交流QQ群 928023749
 */
public class MyRotateView extends View {
 
    //設(shè)置旋轉(zhuǎn)間隔時(shí)間
    private int SPLASH_CIRCLE_ROTATE_TIME = 1000;
    //設(shè)置中心圓半徑
    private float CENTER_CIRCLE_RADIUS;
    private float SMALL_CIRCLE_RADIUS;
    private float mCurrentSingle = 0f;
    private int[] mColorArray;
    private Paint mCirclePaint;
    private ValueAnimator va;
    private Matrix mSpaceMatrix;
 
    private LoadingState mLoadingState;
    //當(dāng)前中心圓半徑
    private float mCurCenterRadius;
    private float mDiagonal;
    private float mLineWidth;
 
    public MyRotateView(Context context) {
        super(context);
    }
 
    public MyRotateView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }
 
    public MyRotateView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
 
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int width = MeasureSpec.getSize(widthMeasureSpec);
        int height = MeasureSpec.getSize(heightMeasureSpec);
 
        //初始化參數(shù)
        initParams(width, height);
 
        setMeasuredDimension(width, height);
    }
 
    private void initParams(int w, int h) {
        //設(shè)置中心圓半徑
        CENTER_CIRCLE_RADIUS = 1 / 4.0f * w;
        //設(shè)置小圓的半徑
        SMALL_CIRCLE_RADIUS = 1 / 25.0f * w;
        //獲取小球顏色
        mColorArray = getResources().getIntArray(R.array.splash_circle_colors);
        //初始化畫(huà)筆
        mCirclePaint = new Paint();
        mCirclePaint.setDither(true);
        mCirclePaint.setAntiAlias(true);
        //初始化旋轉(zhuǎn)矩陣
        mSpaceMatrix = new Matrix();
    }
 
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        
        if (mLoadingState == null) {
            mLoadingState = new RotateState();
        }
        mLoadingState.onDraw(canvas);
    }
 
    //定義 狀態(tài) 抽象類
    private abstract class LoadingState {
        public abstract void onDraw(Canvas canvas);
    }
 
    //旋轉(zhuǎn)動(dòng)畫(huà)
    private class RotateState extends LoadingState {
 
        public RotateState() {
            //計(jì)算每個(gè)小球的間隔
            double spaceAngle = 360.0d / mColorArray.length;
            //初始化旋轉(zhuǎn)矩陣
            mSpaceMatrix.reset();
            mSpaceMatrix.postRotate((float) spaceAngle, getWidth() / 2, getHeight() / 2);
 
            va = ObjectAnimator.ofFloat(0f, 360.0f);
            va.setDuration(SPLASH_CIRCLE_ROTATE_TIME);
            va.setRepeatCount(ValueAnimator.INFINITE);
            va.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator animation) {
                    mCurrentSingle = (float) animation.getAnimatedValue();
                    invalidate();
                }
            });
            va.setInterpolator(new LinearInterpolator());
            va.start();
        }
 
        @Override
        public void onDraw(Canvas canvas) {
            //繪制背景
            canvas.drawColor(Color.WHITE);
            //利用旋轉(zhuǎn)畫(huà)布法
            canvas.save();
            canvas.rotate(mCurrentSingle, getWidth() / 2, getHeight() / 2);
            for (int i = 0; i < mColorArray.length; i++) {
                canvas.concat(mSpaceMatrix);
                //為 每個(gè)球 畫(huà)筆 設(shè)置顏色
                mCirclePaint.setColor(mColorArray[i]);
                //利用旋轉(zhuǎn)畫(huà)布法
                float cx = getWidth() / 2 + CENTER_CIRCLE_RADIUS;
                float cy = getHeight() / 2;
 
                canvas.drawCircle(cx, cy, SMALL_CIRCLE_RADIUS, mCirclePaint);
            }
            canvas.restore();
        }
    }
 
    //聚合動(dòng)畫(huà)
    private class ScaleState extends LoadingState {
 
        public ScaleState() {
            va = ObjectAnimator.ofFloat(CENTER_CIRCLE_RADIUS,0);
            va.setDuration(SPLASH_CIRCLE_ROTATE_TIME);
            va.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator animation) {
                    mCurCenterRadius = (float) animation.getAnimatedValue();
                    invalidate();
                }
            });
            va.addListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mLoadingState = new ExtentState();
                }
            });
            va.setInterpolator(new AnticipateInterpolator());
            va.start();
        }
 
        @Override
        public void onDraw(Canvas canvas) {
            //繪制背景
            canvas.drawColor(Color.WHITE);
            //繪制小圓
            canvas.save();
            //這句話也不能調(diào)，要不然不連貫
            canvas.rotate(mCurrentSingle,getWidth()/2,getHeight()/2);
            for (int i = 0; i < mColorArray.length; i++) {
                mCirclePaint.setColor(mColorArray[i]);
                canvas.concat(mSpaceMatrix);
                canvas.drawCircle(mCurCenterRadius+getWidth()/2,getHeight()/2,SMALL_CIRCLE_RADIUS,mCirclePaint);
            }
            canvas.restore();
        }
    }
 
    //擴(kuò)展動(dòng)畫(huà)
    public class ExtentState extends LoadingState{
 
        public ExtentState() {
            //初始化對(duì)角線
            float cx = getWidth()/2.0f;
            float cy = getHeight()/2.0f;
            mDiagonal = (float) Math.sqrt(Math.pow(cx,2)+Math.pow(cy,2));
 
            va = ObjectAnimator.ofFloat(mDiagonal,0);
            va.setDuration(3000);
            va.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator animation) {
                    mLineWidth = (float) animation.getAnimatedValue();
                    invalidate();
                }
            });
            va.setInterpolator(new LinearInterpolator());
            va.start();
        }
 
        @Override
        public void onDraw(Canvas canvas) {
            mCirclePaint.setColor(Color.WHITE);
            mCirclePaint.setStrokeWidth(mLineWidth*2);//元的半徑只會(huì)到達(dá)線寬的中間，所以要乘2
            mCirclePaint.setStyle(Paint.Style.STROKE);
            canvas.drawCircle(getWidth()/2,getHeight()/2,mDiagonal,mCirclePaint);
        }
    }
 
    public void dismiss() {
        if (mLoadingState instanceof RotateState){
            //取消旋轉(zhuǎn)值動(dòng)畫(huà)
            va.cancel();
            //創(chuàng)建縮放動(dòng)畫(huà)
            mLoadingState = new ScaleState();
            //刷新布局、可以寫(xiě)也可以不寫(xiě)
//            invalidate();
        }
    }
}

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