原文地址:http://blog.csdn.net/x_i_a_o_h_a_i/article/details/40449847

其实网上的3D旋转的例子很多，在这里我只是想把其代码做一个解释。

先上图：

代码：

TurnAroundActivity

 

/** * 图片浏览器的主Activity。 *  * @author guolin */public class TurnAroundActivity extends Activity {	/**	 * 根布局	 */	private RelativeLayout layout;	/**	 * 用于展示图片列表的ListView	 */	private ListView picListView;	/**	 * 翻转后的布局	 */	private LinearLayout picture;	/**	 * 图片列表的适配器	 */	private PictureAdapter adapter;	/**	 * 存放所有图片的集合	 */	private List
    
      picList = new ArrayList
     
      ();	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		requestWindowFeature(Window.FEATURE_NO_TITLE);		setContentView(R.layout.activity_around);		// 对图片列表数据进行初始化操作		initPics();		layout = (RelativeLayout) findViewById(R.id.layout);		picListView = (ListView) findViewById(R.id.pic_list_view);		picture = (LinearLayout) findViewById(R.id.picture);		adapter = new PictureAdapter(this, 0, picList);		picListView.setAdapter(adapter);		picListView.setOnItemClickListener(new OnItemClickListener() {			@Override			public void onItemClick(AdapterView
       parent, View view, int position, long id) {								// 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);			}		});		picture.setOnClickListener(new OnClickListener() {			@Override			public void onClick(View v) {				// 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);			}		});	}	/**	 * 初始化图片列表数据。	 */	private void initPics() {		Picture bird = new Picture("Bird", R.drawable.bird);		picList.add(bird);		Picture winter = new Picture("Winter", R.drawable.winter);		picList.add(winter);		Picture autumn = new Picture("Autumn", R.drawable.autumn);		picList.add(autumn);		Picture greatWall = new Picture("Great Wall", R.drawable.great_wall);		picList.add(greatWall);		Picture waterFall = new Picture("Water Fall", R.drawable.water_fall);		picList.add(waterFall);	}	/**	 * 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。	 * 	 * @author guolin	 */	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;			// 将ListView隐藏			picListView.setVisibility(View.GONE);			// 将ImageView显示			picture.setVisibility(View.VISIBLE);			picture.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。	 * 	 * @author guolin	 */	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;			// 将ImageView隐藏			picture.setVisibility(View.GONE);			// 将ListView显示			picListView.setVisibility(View.VISIBLE);			picListView.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) {		}	}}
     
    

关键类：

Rotate3dAnimation

 

 

/** * 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();		//z轴上的景深		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();		//camera.rotateY(degrees);其实围绕y轴旋转的坐标点是在（0,0）；		//为了让其在围绕（centerX, centerY）点		//preTranslate 作用为在rotateY开始之前先把坐标（centerX, centerY）移到中心点		matrix.preTranslate(-centerX, -centerY);		//postTranslate 当执行完rotateY后再把中心点移动回来		matrix.postTranslate(centerX, centerY);	}}

layout文件：