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<Picture> picList = new ArrayList<Picture>();
@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：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ListView
android:id="@+id/pic_list_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
</ListView>
<LinearLayout
android:id="@+id/picture"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
android:orientation="vertical"
android:visibility="gone"
>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/text"
android:text="ddddddd"/>
<ImageView
android:layout_width="200dp"
android:layout_height="200dp"
android:src="@drawable/bird"
/>
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ddddddd"/>
</LinearLayout>
</RelativeLayout>