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); } }
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() { @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; } } };
参考推荐:
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