Android 滑动效果进阶篇（五）—— 3D旋转

前面介绍了利用Android自带的控件，进行滑动翻页制作效果，现在我们通过代码实现一些滑动翻页的动画效果。

Animation实现动画有两个方式：帧动画（frame-by-frame animation）和补间动画（tweened animation）

本示例通过继承Animation自定义Rotate3D，实现3D翻页效果。效果图如下：

1、Rotate3D（Animation）

首先，自定义Animation的3D动画类Rotate3D

public class Rotate3D extends Animation {private float fromDegree;// 旋转起始角度private float toDegree;// 旋转终止角度private float mCenterX;// 旋转中心xprivate float mCenterY;// 旋转中心yprivate Camera mCamera;public Rotate3D(float fromDegree, float toDegree, float centerX, float centerY) {this.fromDegree = fromDegree;this.toDegree = toDegree;this.mCenterX = centerX;this.mCenterY = centerY;}@Overridepublic void initialize(int width, int height, int parentWidth, int parentHeight) {super.initialize(width, height, parentWidth, parentHeight);mCamera = new Camera();}@Overrideprotected void applyTransformation(float interpolatedTime, Transformation t) {final float FromDegree = fromDegree;float degrees = FromDegree + (toDegree - fromDegree) * interpolatedTime;// 旋转角度（angle）final float centerX = mCenterX;final float centerY = mCenterY;final Matrix matrix = t.getMatrix();if (degrees <= -76.0f) {degrees = -90.0f;mCamera.save();mCamera.rotateY(degrees);// 旋转mCamera.getMatrix(matrix);mCamera.restore();} else if (degrees >= 76.0f) {degrees = 90.0f;mCamera.save();mCamera.rotateY(degrees);mCamera.getMatrix(matrix);mCamera.restore();} else {mCamera.save();mCamera.translate(0, 0, centerX);// 位移xmCamera.rotateY(degrees);mCamera.translate(0, 0, -centerX);mCamera.getMatrix(matrix);mCamera.restore();}matrix.preTranslate(-centerX, -centerY);matrix.postTranslate(centerX, centerY);}}

然后，实例化Rotate3D的旋转方向

public void initAnimation() {// 获取旋转中心DisplayMetrics dm = new DisplayMetrics();dm = getResources().getDisplayMetrics();mCenterX = dm.widthPixels / 2;mCenterY = dm.heightPixels / 2;// 定义旋转方向int duration = 1000;lQuest1Animation = new Rotate3D(0, -90, mCenterX, mCenterY);// 下一页的【question1】旋转方向（从0度转到-90，参考系为水平方向为0度）lQuest1Animation.setFillAfter(true);lQuest1Animation.setDuration(duration);lQuest2Animation = new Rotate3D(90, 0, mCenterX, mCenterY);// 下一页的【question2】旋转方向（从90度转到0，参考系为水平方向为0度）（起始第一题）lQuest2Animation.setFillAfter(true);lQuest2Animation.setDuration(duration);rQuest1Animation = new Rotate3D(0, 90, mCenterX, mCenterY);// 上一页的【question1】旋转方向（从0度转到90，参考系为水平方向为0度）rQuest1Animation.setFillAfter(true);rQuest1Animation.setDuration(duration);rQuest2Animation = new Rotate3D(-90, 0, mCenterX, mCenterY);// 上一页的【question2】旋转方向（从-90度转到0，参考系为水平方向为0度）rQuest2Animation.setFillAfter(true);rQuest2Animation.setDuration(duration);}

2、Activity

首先，定义两个布局文件，用于旋转的画面切换

main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/layout_main"android:layout_width="fill_parent"android:layout_height="wrap_content"    android:orientation="vertical">...</LinearLayout>

next.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/layout_next"android:layout_width="fill_parent"android:layout_height="wrap_content"    android:orientation="vertical">...</LinearLayout>

限于篇幅，完整布局文件请详见源码 ^_^

然后，初始化两个旋转的布局文件资源

private void initMain(){        setContentView(R.layout.main);layoutmain = (LinearLayout)findViewById(R.id.layout_main);btn_MainLast = (Button)findViewById(R.id.main_last);btn_MainNext = (Button)findViewById(R.id.main_next);btn_MainLast.setOnClickListener(listener);btn_MainNext.setOnClickListener(listener);}private void initNext(){        setContentView(R.layout.next);layoutnext = (LinearLayout)findViewById(R.id.layout_next);btn_NextLast = (Button)findViewById(R.id.next_last);btn_NextNext = (Button)findViewById(R.id.next_next);btn_NextLast.setOnClickListener(listener);btn_NextNext.setOnClickListener(listener);}

最后，设置布局文件中的按钮监听事件，响应3D旋转动画和方向

private View.OnClickListener listener = new View.OnClickListener() {@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.main_last:// 上一页layoutmain.startAnimation(lQuest1Animation);// 当前页向左旋转（0，-90）initNext();layoutnext.startAnimation(lQuest2Animation);// 下一页向左旋转（90, 0）break;case R.id.main_next:// 下一页layoutmain.startAnimation(rQuest1Animation);// 当前页向右旋转（0，90）initNext();layoutnext.startAnimation(rQuest2Animation);// 下一页向右旋转（-90, 0）break;case R.id.next_last:layoutnext.startAnimation(lQuest1Animation);initMain();layoutmain.startAnimation(lQuest2Animation);break;case R.id.next_next:layoutnext.startAnimation(rQuest1Animation);initMain();layoutmain.startAnimation(rQuest2Animation);break;}}};

源码下载

参考推荐：

animation