类似Chome的翻转效果
简单的demo，屏幕上下滑动翻转View，类似Android Chrome的效果
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代码很简单，扩展一X轴旋转的动画RotateAnimationEX：
package com.ray.animation;import android.graphics.Camera;import android.graphics.Matrix;import android.util.Log;import android.view.animation.Animation;import android.view.animation.Transformation;public class RotateAnimationEX extends Animation {private float mFromDegress, mToDegress;private float mCenterX, mCenterY;private Camera mCamera;private OnFlipListener mFlipListener;private boolean onFilpped;public RotateAnimationEX(float fromDegrees, float toDegrees, int centerX, int centerY) {mFromDegress = fromDegrees;mToDegress = toDegrees;mCenterX = centerX;mCenterY = centerY;mCamera = new Camera();onFilpped = false;}public void setFlipListener(OnFlipListener listener) {mFlipListener = listener;}@Overrideprotected void applyTransformation(float interpolatedTime, Transformation t) {mCamera.save();float rotateAngle = mFromDegress + (mToDegress - mFromDegress)*interpolatedTime;Log.d("Trace", "angel" + rotateAngle);if (mFlipListener != null) {if (rotateAngle >= 90 && rotateAngle <=180|| rotateAngle <=-90 && rotateAngle >= -180) {if (!onFilpped) {mFlipListener.onFlip();onFilpped = true;}} }mCamera.rotateX(rotateAngle);Matrix m = t.getMatrix();mCamera.getMatrix(m);m.preTranslate(-mCenterX, -mCenterY);m.postTranslate(mCenterX, mCenterY);mCamera.restore();}public interface OnFlipListener {void onFlip();}}?一测试的ViewGroup：
package com.ray.animation;import com.ray.animation.RotateAnimationEX.OnFlipListener;import android.content.Context;import android.graphics.Camera;import android.graphics.Color;import android.graphics.Matrix;import android.view.GestureDetector;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.view.animation.Transformation;public class TestViewGroup extends ViewGroup implements GestureDetector.OnGestureListener,OnFlipListener {public static final int MARGIN = 30;public static final int MAX_ROTATE_ANGLE = 90;private View mTestView;private RotateAnimationEX mRotaAnim;private GestureDetector mGestureDetector;private float rotateAngle = 0;private Camera mCamera;public TestViewGroup(Context context) {super(context);mTestView = new View(context);mTestView.setBackgroundColor(COLORS[0]);addView(mTestView);setStaticTransformationsEnabled(true);mGestureDetector = new GestureDetector(context,this);mCamera = new Camera();}@Overrideprotected boolean getChildStaticTransformation(View child, Transformation t) {if (child == mTestView) {mCamera.save();Matrix m = t.getMatrix();mCamera.rotateX(rotateAngle);mCamera.getMatrix(m);m.preTranslate(-child.getWidth() / 2, -child.getHeight() / 2);m.postTranslate(child.getWidth() / 2, child.getHeight() / 2);mCamera.restore();return true;}return false;}@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {mTestView.layout(l + MARGIN, t + MARGIN, r - MARGIN, b - MARGIN);}@Overridepublic boolean onTouchEvent(MotionEvent event) {boolean retValue = mGestureDetector.onTouchEvent(event);if (event.getAction() == MotionEvent.ACTION_UP) {mRotaAnim = new RotateAnimationEX(rotateAngle, 180*rotateAngle/Math.abs(rotateAngle),mTestView.getWidth()/2, mTestView.getHeight()/2);mRotaAnim.setFlipListener(this);mRotaAnim.setDuration(700);mRotaAnim.setFillAfter(true);mTestView.startAnimation(mRotaAnim);rotateAngle = 0;}return retValue;}@Overridepublic boolean onDown(MotionEvent e) {if (mTestView != null)mTestView.clearAnimation();return true;}@Overridepublic boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {return false;}@Overridepublic void onLongPress(MotionEvent e) {}@Overridepublic boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,float distanceY) {rotateAngle = (e1.getY() - e2.getY()) / getHeight() * MAX_ROTATE_ANGLE;invalidate();return true;}@Overridepublic void onShowPress(MotionEvent e) {}@Overridepublic boolean onSingleTapUp(MotionEvent e) {return false;}@Overridepublic void onFlip() {mTestView.setBackgroundColor(COLORS[(++mCurrentColor) % COLORS.length]);}private static int mCurrentColor = 0;private static final int[] COLORS = new int[] {Color.BLUE, Color.RED};}?使用代码：
package com.ray.demo;import com.ray.animation.TestViewGroup;import android.app.Activity;import android.os.Bundle;public class ChromeEggActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new TestViewGroup(this)); }}?