Android中轴旋转特效实现，几张图片自动切换

淡淡的烟草味﹌ 2022-08-20 12:14 177阅读 0赞

几张图片以3D立体旋转的效果进行切换（[此例由此处参考而来][Link 1]：

public class MainActivity extends Activity { 
        private LinearLayout layout;  //根布局；
        private ImageView picture, picture1;  //用于展示图片详细的ImageView；
        int[] imgs = {R.drawable.bird, R.drawable.winter, R.drawable.great_wall, R.drawable.water_fall};  //创建一个数组，存放要切换的图片；
    
        Boolean flag = true;  
        int index = -1;                                       //要加载的图片脚标；
    
        @Override
        protected void onCreate(Bundle savedInstanceState) 
        {
            super.onCreate(savedInstanceState);
            requestWindowFeature(Window.FEATURE_NO_TITLE);
            setContentView(R.layout.activity_main);
    
            layout = (LinearLayout) findViewById(R.id.layout);
            picture = (ImageView) findViewById(R.id.picture);   
            picture1 = (ImageView) findViewById(R.id.picture1);     
    
            picture.setVisibility(View.GONE);
            new Thread()
            {
                @Override
                public void run() 
                {
                    while(flag)
                    {
                        if(index < imgs.length-1)
                        {               
                            index++;
                            handler.sendEmptyMessage(0);
                        }           
                        else if(index >= imgs.length-1)
                        {
                            flag = false;
                        }
                        try 
                        {
                            Thread.sleep(3500);
                        } catch (InterruptedException e) 
                        {
                            e.printStackTrace();
                        }
                    }
    
                }
            }.start();
        }
        Handler handler = new Handler()
        {
            @Override
            public void handleMessage(Message msg) 
            {
                super.handleMessage(msg);
                if(msg.what == 0)
                {
    
                    if(index % 2 == 1)
                    {
                        leftToRigth();
                    }
                    else if(index%2==0)
                    {
                        rigthToLeft();
                    }
                }
            }
        };
    
        public void rigthToLeft()
        {
            // 奇数张图片转换到偶数张；
            picture.setImageResource(imgs[index]);
            // 获取布局的中心点位置，作为旋转的中心点
            float centerX = layout.getWidth() / 2f;
            float centerY = layout.getHeight() / 2f;
            // 构建3D旋转动画对象，旋转角度为360到270度，这使得ImageView将会从可见变为不可见，并且旋转的方向是相反的
            final Rotate3dAnimation rotation = new Rotate3dAnimation(360, 270, centerX,
                    centerY, 310.0f, true);
            // 动画持续时间500毫秒
            rotation.setDuration(500);
            // 动画完成后保持完成的状态
            rotation.setFillAfter(true);
            rotation.setInterpolator(new AccelerateInterpolator());
            // 设置动画的监听器
            rotation.setAnimationListener(new TurnToListView());
            layout.startAnimation(rotation);
        }
    
        public void leftToRigth()
        {
            // 偶数张转换到奇数张图片；
            picture1.setImageResource(imgs[index]);
            // 获取布局的中心点位置，作为旋转的中心点
            float centerX = layout.getWidth() / 2f;
            float centerY = layout.getHeight() / 2f;
            // 构建3D旋转动画对象，旋转角度为0到90度，这使得ListView将会从可见变为不可见
            final Rotate3dAnimation rotation = new Rotate3dAnimation(0, 90, centerX, centerY,
                    310.0f, true);
            // 动画持续时间500毫秒
            rotation.setDuration(500);
            // 动画完成后保持完成的状态
            rotation.setFillAfter(true);
            rotation.setInterpolator(new AccelerateInterpolator());
            // 设置动画的监听器
            rotation.setAnimationListener(new TurnToImageView());
            layout.startAnimation(rotation);        
        }
    
        /** * 注册在ListView点击动画中的动画监听器，用于完成ListView的后续动画。 */
        class TurnToImageView implements AnimationListener 
        {
            @Override
            public void onAnimationStart(Animation animation) 
            {
            }
    
            /** * 当ListView的动画完成后，还需要再启动ImageView的动画，让ImageView从不可见变为可见 */
            @Override
            public void onAnimationEnd(Animation animation) 
            {
                // 获取布局的中心点位置，作为旋转的中心点
                float centerX = layout.getWidth() / 2f;
                float centerY = layout.getHeight() / 2f;
                picture.setVisibility(View.GONE);
                picture1.setVisibility(View.VISIBLE);
                picture1.requestFocus();
                // 构建3D旋转动画对象，旋转角度为270到360度，这使得ImageView将会从不可见变为可见
                final Rotate3dAnimation rotation = new Rotate3dAnimation(270, 360, centerX, centerY,
                        310.0f, false);
                // 动画持续时间500毫秒
                rotation.setDuration(500);
                // 动画完成后保持完成的状态
                rotation.setFillAfter(true);
                rotation.setInterpolator(new AccelerateInterpolator());
                layout.startAnimation(rotation);
            }
    
            @Override
            public void onAnimationRepeat(Animation animation) 
            {
            }
    
        }
    
        /** * 注册在ImageView点击动画中的动画监听器，用于完成ImageView的后续动画。 */
        class TurnToListView implements AnimationListener 
        {
            @Override
            public void onAnimationStart(Animation animation) 
            {
            }
    
            /** * 当ImageView的动画完成后，还需要再启动ListView的动画，让ListView从不可见变为可见 */
            @Override
            public void onAnimationEnd(Animation animation) 
            {
                // 获取布局的中心点位置，作为旋转的中心点
                float centerX = layout.getWidth() / 2f;
                float centerY = layout.getHeight() / 2f;
                picture1.setVisibility(View.GONE);
                picture.setVisibility(View.VISIBLE);
                picture.requestFocus();
                // 构建3D旋转动画对象，旋转角度为90到0度，这使得ListView将会从不可见变为可见，从而回到原点
                final Rotate3dAnimation rotation = new Rotate3dAnimation(90, 0, centerX, centerY,
                        310.0f, false);
                // 动画持续时间500毫秒
                rotation.setDuration(500);
                // 动画完成后保持完成的状态
                rotation.setFillAfter(true);
                rotation.setInterpolator(new AccelerateInterpolator());
                layout.startAnimation(rotation);
            }
    
            @Override
            public void onAnimationRepeat(Animation animation)
            {
            }
        }
    }

自定义类继承Animation：

package com.lu.animotion;
    
    import android.graphics.Camera;
    import android.graphics.Matrix;
    import android.view.animation.Animation;
    import android.view.animation.Transformation;
    
    /*可以看到，这个类的构造函数中接收一些3D旋转时所需用到的参数，比如旋转开始和结束的角度， * 旋转的中心点等。然后重点看下applyTransformation()方法，首先根据动画播放的 * 时间来计算出当前旋转的角度，然后让Camera也根据动画播放的时间在Z轴进行一定的偏移， * 使视图有远离视角的感觉。接着调用Camera的rotateY()方法，让视图围绕Y轴进行旋转， * 从而产生立体旋转的效果。最后通过Matrix来确定旋转的中心点的位置。有了这个工具类之后， * 我们就可以借助它非常简单地实现中轴旋转的特效了。 */
    
    /** * An animation that rotates the view on the Y axis between two specified angles. * This animation also adds a translation on the Z axis (depth) to improve the effect. */
    public class Rotate3dAnimation extends Animation { 
        private final float mFromDegrees;
        private final float mToDegrees;
        private final float mCenterX;
        private final float mCenterY;
        private final float mDepthZ;
        private final boolean mReverse;
        private Camera mCamera;
    
        /** * Creates a new 3D rotation on the Y axis. The rotation is defined by its * start angle and its end angle. Both angles are in degrees. The rotation * is performed around a center point on the 2D space, definied by a pair * of X and Y coordinates, called centerX and centerY. When the animation * starts, a translation on the Z axis (depth) is performed. The length * of the translation can be specified, as well as whether the translation * should be reversed in time. * * @param fromDegrees the start angle of the 3D rotation * @param toDegrees the end angle of the 3D rotation * @param centerX the X center of the 3D rotation * @param centerY the Y center of the 3D rotation * @param reverse true if the translation should be reversed, false otherwise */
        public Rotate3dAnimation(float fromDegrees, float toDegrees,
                float centerX, float centerY, float depthZ, boolean reverse) 
        {
            mFromDegrees = fromDegrees;
            mToDegrees = toDegrees;
            mCenterX = centerX;
            mCenterY = centerY;
            mDepthZ = depthZ;
            mReverse = reverse;
        }
    
        @Override
        public void initialize(int width, int height, int parentWidth, int parentHeight) 
        {
            super.initialize(width, height, parentWidth, parentHeight);
            mCamera = new Camera();
        }
    
        @Override
        protected void applyTransformation(float interpolatedTime, Transformation t) 
        {
            final float fromDegrees = mFromDegrees;
            float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);
    
            final float centerX = mCenterX;
            final float centerY = mCenterY;
            final Camera camera = mCamera;
    
            final Matrix matrix = t.getMatrix();
    
            camera.save();
            if (mReverse) 
            {
                camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime);
            } 
            else 
            {
                camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime));
            }
            camera.rotateY(degrees);
            camera.getMatrix(matrix);
            camera.restore();
    
            matrix.preTranslate(-centerX, -centerY);
            matrix.postTranslate(centerX, centerY);
        }
    }

[Link 1]: http://blog.csdn.net/guolin_blog/article/details/10766017