Android利用Camera实现图片的旋转动画

MainActivity如下:

package cc.testrotatephoto;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.app.Activity;
/**
 * Demo描述:
 * 利用Camera实现图片的旋转动画
 * 
 * 注意事项:
 * 1 Rotate3dAnimation在APIDemo中的位置Views/Animation/3D Transition
 * 2 待有空时候再仔细研究Rotate3dAnimation
 * 
 * 参考资料:
 * 1 http://blog.csdn.net/guolin_blog/article/details/10766017
 * 2 http://blog.csdn.net/mapdigit/article/details/7804654
 * 3 http://wang-peng1.iteye.com/blog/572886
 *   Thank you very much
 */
public class MainActivity extends Activity {
	private RelativeLayout mRelativeLayout;
    private ImageView mImageView;
    private Button mButton;
    private int count=0;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		init();
	}
	
	private void init(){
		mRelativeLayout=(RelativeLayout) findViewById(R.id.relativeLayout);
		mImageView=(ImageView) findViewById(R.id.imageView);
		mButton=(Button) findViewById(R.id.button);
		mButton.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View view) {
				float centerX = mRelativeLayout.getWidth() / 2f;
				float centerY = mRelativeLayout.getHeight() / 2f;
				// 构建3D旋转动画对象,旋转角度为0到90度
				Rotate3dAnimation rotation = new Rotate3dAnimation(0, 90, centerX, centerY,310.0f, true);
				// 动画持续时间500毫秒
				rotation.setDuration(500);
				// 动画完成后保持完成状态
				rotation.setFillAfter(true);
				rotation.setInterpolator(new AccelerateInterpolator());
				// 设置动画的监听器
				if (count%2==0) {
					rotation.setAnimationListener(new RotateToTheSecondImageViewAnimationListener());
				}else{
					rotation.setAnimationListener(new RotateToTheFirstImageViewAnimationListener());
				}
				mRelativeLayout.startAnimation(rotation);
				count++;
			}
		});
	}
	
	
	class RotateToTheFirstImageViewAnimationListener implements AnimationListener {
		@Override
		public void onAnimationStart(Animation animation) {
		}
		
		@Override
		public void onAnimationEnd(Animation animation) {
			mImageView.setImageResource(R.drawable.c);
			
			// 获取布局的中心点位置，作为旋转的中心点
			float centerX = mRelativeLayout.getWidth() / 2f;
			float centerY = mRelativeLayout.getHeight() / 2f;
			
			// 构建3D旋转动画对象,旋转角度为90到0度
			Rotate3dAnimation rotation = new Rotate3dAnimation(90, 0, centerX, centerY,310.0f, false);
			// 动画持续时间500毫秒
			rotation.setDuration(500);
			// 动画完成后保持完成状态
			rotation.setFillAfter(true);
			rotation.setInterpolator(new AccelerateInterpolator());
			mRelativeLayout.startAnimation(rotation);
		}

		@Override
		public void onAnimationRepeat(Animation animation) {
		}

	}
	
	
	class RotateToTheSecondImageViewAnimationListener implements AnimationListener {

		@Override
		public void onAnimationStart(Animation animation) {
		}

		
		@Override
		public void onAnimationEnd(Animation animation) {
			//动画完成后展示另外的图片
			mImageView.setImageResource(R.drawable.b);
			
			// 获取布局的中心点位置,作为旋转的中心点
			float centerX = mRelativeLayout.getWidth() / 2f;
			float centerY = mRelativeLayout.getHeight() / 2f;
			// 构建3D旋转动画对象,旋转角度为270到360度
			Rotate3dAnimation rotation = new Rotate3dAnimation(270, 360, centerX, centerY,310.0f, false);
			// 动画持续时间500毫秒
			rotation.setDuration(500);
			// 动画完成后保持完成状态
			rotation.setFillAfter(true);
			rotation.setInterpolator(new AccelerateInterpolator());
			mRelativeLayout.startAnimation(rotation);
		}

		@Override
		public void onAnimationRepeat(Animation animation) {
		}

	}

}

Rotate3dAnimation如下:

package cc.testrotatephoto;

import android.graphics.Camera;
import android.graphics.Matrix;
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 isReverse;
    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;
        isReverse = 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();

        camera.save();
        if (isReverse) {
            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);
    }
}

main.xml如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/relativeLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="fill_parent"
        android:layout_height="350dip"
        android:src="@drawable/c" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/imageView"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="30dip"
        android:text="button" />

</RelativeLayout>