其實網上的3D旋轉的例子很多，在這裏我只是想把其代碼做一個解釋。
先上圖：
代碼：
TurnAroundActivity
/**
* 圖片瀏覽器的主Activity。
*
* @author guolin
*/
public class TurnAroundActivity extends Activity {
/**
* 根佈局
*/
private RelativeLayout layout;
/**
* 用於展示圖片列表的ListView
*/
private ListView picListView;
/**
* 翻轉後的佈局
*/
private LinearLayout picture;
/**
* 圖片列表的適配器
*/
private PictureAdapter adapter;
/**
* 存放所有圖片的集合
*/
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);
// 對圖片列表數據進行初始化操作
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) {
// 獲取佈局的中心點位置，作爲旋轉的中心點
float centerX = layout.getWidth() / 2f;
float centerY = layout.getHeight() / 2f;
// 構建3D旋轉動畫對象，旋轉角度爲0到90度，這使得ListView將會從可見變爲不可見
final Rotate3dAnimation rotation = new Rotate3dAnimation(0, 90, centerX, centerY,
310.0f, true);
// 動畫持續時間500毫秒
rotation.setDuration(500);
// 動畫完成後保持完成的狀態
rotation.setFillAfter(true);
rotation.setInterpolator(new AccelerateInterpolator());
// 設置動畫的監聽器
rotation.setAnimationListener(new TurnToImageView());
layout.startAnimation(rotation);
}
});
picture.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// 獲取佈局的中心點位置，作爲旋轉的中心點
float centerX = layout.getWidth() / 2f;
float centerY = layout.getHeight() / 2f;
// 構建3D旋轉動畫對象，旋轉角度爲360到270度，這使得ImageView將會從可見變爲不可見，並且旋轉的方向是相反的
final Rotate3dAnimation rotation = new Rotate3dAnimation(360, 270, centerX,
centerY, 310.0f, true);
// 動畫持續時間500毫秒
rotation.setDuration(500);
// 動畫完成後保持完成的狀態
rotation.setFillAfter(true);
rotation.setInterpolator(new AccelerateInterpolator());
// 設置動畫的監聽器
rotation.setAnimationListener(new TurnToListView());
layout.startAnimation(rotation);
}
});
}
/**
* 初始化圖片列表數據。
*/
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);
}
/**
* 註冊在ListView點擊動畫中的動畫監聽器，用於完成ListView的後續動畫。
*
* @author guolin
*/
class TurnToImageView implements AnimationListener {
@Override
public void onAnimationStart(Animation animation) {
}
/**
* 當ListView的動畫完成後，還需要再啓動ImageView的動畫，讓ImageView從不可見變爲可見
*/
@Override
public void onAnimationEnd(Animation animation) {
// 獲取佈局的中心點位置，作爲旋轉的中心點
float centerX = layout.getWidth() / 2f;
float centerY = layout.getHeight() / 2f;
// 將ListView隱藏
picListView.setVisibility(View.GONE);
// 將ImageView顯示
picture.setVisibility(View.VISIBLE);
picture.requestFocus();
// 構建3D旋轉動畫對象，旋轉角度爲270到360度，這使得ImageView將會從不可見變爲可見
final Rotate3dAnimation rotation = new Rotate3dAnimation(270, 360, centerX, centerY,
310.0f, false);
// 動畫持續時間500毫秒
rotation.setDuration(500);
// 動畫完成後保持完成的狀態
rotation.setFillAfter(true);
rotation.setInterpolator(new AccelerateInterpolator());
layout.startAnimation(rotation);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
}
/**
* 註冊在ImageView點擊動畫中的動畫監聽器，用於完成ImageView的後續動畫。
*
* @author guolin
*/
class TurnToListView implements AnimationListener {
@Override
public void onAnimationStart(Animation animation) {
}
/**
* 當ImageView的動畫完成後，還需要再啓動ListView的動畫，讓ListView從不可見變爲可見
*/
@Override
public void onAnimationEnd(Animation animation) {
// 獲取佈局的中心點位置，作爲旋轉的中心點
float centerX = layout.getWidth() / 2f;
float centerY = layout.getHeight() / 2f;
// 將ImageView隱藏
picture.setVisibility(View.GONE);
// 將ListView顯示
picListView.setVisibility(View.VISIBLE);
picListView.requestFocus();
// 構建3D旋轉動畫對象，旋轉角度爲90到0度，這使得ListView將會從不可見變爲可見，從而回到原點
final Rotate3dAnimation rotation = new Rotate3dAnimation(90, 0, centerX, centerY,
310.0f, false);
// 動畫持續時間500毫秒
rotation.setDuration(500);
// 動畫完成後保持完成的狀態
rotation.setFillAfter(true);
rotation.setInterpolator(new AccelerateInterpolator());
layout.startAnimation(rotation);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
}
}關鍵類：
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軸上的景深
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);其實圍繞y軸旋轉的座標點是在（0,0）；
//爲了讓其在圍繞（centerX, centerY）點
//preTranslate 作用爲在rotateY開始之前先把座標（centerX, centerY）移到中心點
matrix.preTranslate(-centerX, -centerY);
//postTranslate 當執行完rotateY後再把中心點移動回來
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>