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 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
// 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>
next.xml
…
</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
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
参考推荐: