Android利用Camera实现中轴3D卡牌翻转效果

package com.feng.androidtest;import android.graphics.Camera;import android.graphics.Matrix;import android.util.Log;import android.view.animation.Animation;import android.view.animation.Transformation;/** * An animation that rotates the view on the Y axis between two specified angles. * This animation also adds a translation on the Z axis (depth) to improve the effect. */public class Rotate3dAnimation extends Animation { private final float mFromDegrees; private final float mToDegrees; private final float mCenterX; private final float mCenterY; private final float mDepthZ; private final boolean mReverse; private Camera mCamera; /**  * Creates a new 3D rotation on the Y axis. The rotation is defined by its  * start angle and its end angle. Both angles are in degrees. The rotation  * is performed around a center point on the 2D space, definied by a pair  * of X and Y coordinates, called centerX and centerY. When the animation  * starts, a translation on the Z axis (depth) is performed. The length  * of the translation can be specified, as well as whether the translation  * should be reversed in time.  *  * @param fromDegrees the start angle of the 3D rotation  * @param toDegrees the end angle of the 3D rotation  * @param centerX the X center of the 3D rotation  * @param centerY the Y center of the 3D rotation  * @param reverse true if the translation should be reversed, false otherwise  */ public Rotate3dAnimation(float fromDegrees, float toDegrees,   float centerX, float centerY, float depthZ, boolean reverse) {  mFromDegrees = fromDegrees;  mToDegrees = toDegrees;  mCenterX = centerX;  mCenterY = centerY;  mDepthZ = depthZ;  mReverse = reverse; } @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 fromDegrees = mFromDegrees;  float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);  final float centerX = mCenterX;  final float centerY = mCenterY;  final Camera camera = mCamera;  final Matrix matrix = t.getMatrix();  Log.i("interpolatedTime", interpolatedTime+"");  camera.save();  if (mReverse) {   camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime);  } else {   camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime));  }  camera.rotateY(degrees);  camera.getMatrix(matrix);  camera.restore();  matrix.preTranslate(-centerX, -centerY);  matrix.postTranslate(centerX, centerY); }}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@android:color/white" > <Button  android:id="@+id/btn_open"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:layout_margin="16dp"  android:onClick="onClickView"  android:text="打开"  android:textColor="@android:color/black"  android:textSize="16sp" /> <RelativeLayout  android:id="@+id/rl_content"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:layout_below="@id/btn_open"  android:layout_marginTop="16dp"   android:background="@android:color/black">  <ImageView   android:id="@+id/iv_logo"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:contentDescription="@null"   android:src="@drawable/ic_qrcode"    android:scaleType="centerInside"/>  <TextView   android:id="@+id/tv_desc"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:padding="16dp"   android:text="武林网。"   android:textColor="@android:color/white"   android:textSize="18sp"    android:visibility="gone"/> </RelativeLayout></RelativeLayout>

package com.feng.androidtest;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.animation.AccelerateInterpolator;import android.view.animation.Animation;import android.view.animation.Animation.AnimationListener;import android.view.animation.DecelerateInterpolator;import android.widget.Button;import android.widget.ImageView;import android.widget.RelativeLayout;import android.widget.TextView;import com.example.androidtest.R;public class MainActivity extends Activity { private RelativeLayout mContentRl; private ImageView mLogoIv; private TextView mDescTv; private Button mOpenBtn; private int centerX; private int centerY; private int depthZ = 400; private int duration = 600; private Rotate3dAnimation openAnimation; private Rotate3dAnimation closeAnimation; private boolean isOpen = false; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  mContentRl = (RelativeLayout) findViewById(R.id.rl_content);  mLogoIv = (ImageView) findViewById(R.id.iv_logo);  mDescTv = (TextView) findViewById(R.id.tv_desc);  mOpenBtn = (Button) findViewById(R.id.btn_open); } /**  * 卡牌文本介绍打开效果：注意旋转角度  */ private void initOpenAnim() {  //从0到90度，顺时针旋转视图，此时reverse参数为true，达到90度时动画结束时视图变得不可见，  openAnimation = new Rotate3dAnimation(0, 90, centerX, centerY, depthZ, true);  openAnimation.setDuration(duration);  openAnimation.setFillAfter(true);  openAnimation.setInterpolator(new AccelerateInterpolator());  openAnimation.setAnimationListener(new AnimationListener() {   @Override   public void onAnimationStart(Animation animation) {   }   @Override   public void onAnimationRepeat(Animation animation) {   }   @Override   public void onAnimationEnd(Animation animation) {    mLogoIv.setVisibility(View.GONE);    mDescTv.setVisibility(View.VISIBLE);    //从270到360度，顺时针旋转视图，此时reverse参数为false，达到360度动画结束时视图变得可见    Rotate3dAnimation rotateAnimation = new Rotate3dAnimation(270, 360, centerX, centerY, depthZ, false);    rotateAnimation.setDuration(duration);    rotateAnimation.setFillAfter(true);    rotateAnimation.setInterpolator(new DecelerateInterpolator());    mContentRl.startAnimation(rotateAnimation);   }  }); } /**  * 卡牌文本介绍关闭效果：旋转角度与打开时逆行即可  */ private void initCloseAnim() {  closeAnimation = new Rotate3dAnimation(360, 270, centerX, centerY, depthZ, true);  closeAnimation.setDuration(duration);  closeAnimation.setFillAfter(true);  closeAnimation.setInterpolator(new AccelerateInterpolator());  closeAnimation.setAnimationListener(new AnimationListener() {   @Override   public void onAnimationStart(Animation animation) {   }   @Override   public void onAnimationRepeat(Animation animation) {   }   @Override   public void onAnimationEnd(Animation animation) {    mLogoIv.setVisibility(View.VISIBLE);    mDescTv.setVisibility(View.GONE);    Rotate3dAnimation rotateAnimation = new Rotate3dAnimation(90, 0, centerX, centerY, depthZ, false);    rotateAnimation.setDuration(duration);    rotateAnimation.setFillAfter(true);    rotateAnimation.setInterpolator(new DecelerateInterpolator());    mContentRl.startAnimation(rotateAnimation);   }  }); } public void onClickView(View v) {  //以旋转对象的中心点为旋转中心点，这里主要不要再onCreate方法中获取，因为视图初始绘制时，获取的宽高为0  centerX = mContentRl.getWidth()/2;   centerY = mContentRl.getHeight()/2;   if (openAnimation == null) {   initOpenAnim();   initCloseAnim();  }   //用作判断当前点击事件发生时动画是否正在执行  if (openAnimation.hasStarted() && !openAnimation.hasEnded()) {   return;  }  if (closeAnimation.hasStarted() && !closeAnimation.hasEnded()) {   return;  }  //判断动画执行  if (isOpen) {   mContentRl.startAnimation(closeAnimation);  }else {   mContentRl.startAnimation(openAnimation);  }  isOpen = !isOpen;  mOpenBtn.setText(isOpen ? "关闭" : "打开"); }}