Android编程实现3D滑动旋转效果的方法

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x 
  private float mCenterY;   // 旋转中心y 
  private Camera mCamera; 
  public Rotate3D(float fromDegree, float toDegree, float centerX, float centerY) { 
    this.fromDegree = fromDegree; 
    this.toDegree = toDegree; 
    this.mCenterX = centerX; 
    this.mCenterY = centerY; 
  } 
  @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 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x 
      mCamera.rotateY(degrees); 
      mCamera.translate(0, 0, -centerX); 
      mCamera.getMatrix(matrix); 
      mCamera.restore(); 
    } 
    matrix.preTranslate(-centerX, -centerY); 
    matrix.postTranslate(centerX, centerY); 
  } 
}

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); 
}

<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>

<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>

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); 
}

private View.OnClickListener listener = new View.OnClickListener() { 
  @Override 
  public 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; 
    } 
  } 
};