Android 3D相册图片效果源码

package com.android.CustomGallery; import android.content.Context; import android.graphics.Camera; import android.graphics.Matrix; import android.util.AttributeSet; import android.util.Log; import android.view.View; import android.view.animation.Transformation; import android.widget.Gallery; import android.widget.ImageView; public class GalleryFlow extends Gallery { /** * Graphics Camera used for transforming the matrix of ImageViews */ private Camera mCamera = new Camera(); /** * The maximum angle the Child ImageView will be rotated by */ private int mMaxRotationAngle = 50; /** * The maximum zoom on the centre Child */ private int mMaxZoom = -250; /** * The Centre of the Coverflow */ private int mCoveflowCenter; public GalleryFlow(Context context) { super(context); this.setStaticTransformationsEnabled(true); } public GalleryFlow(Context context, AttributeSet attrs) { super(context, attrs); this.setStaticTransformationsEnabled(true); } public GalleryFlow(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); this.setStaticTransformationsEnabled(true); } /** * Get the max rotational angle of the image * * @return the mMaxRotationAngle */ public int getMaxRotationAngle() { return mMaxRotationAngle; } /** * Set the max rotational angle of each image * * @param maxRotationAngle * the mMaxRotationAngle to set */ public void setMaxRotationAngle(int maxRotationAngle) { mMaxRotationAngle = maxRotationAngle; } /** * Get the Max zoom of the centre image * * @return the mMaxZoom */ public int getMaxZoom() { return mMaxZoom; } /** * Set the max zoom of the centre image * * @param maxZoom * the mMaxZoom to set */ public void setMaxZoom(int maxZoom) { mMaxZoom = maxZoom; } /** * Get the Centre of the Coverflow * * @return The centre of this Coverflow. */ private int getCenterOfCoverflow() { //Log.e("CoverFlow Width+Height", getWidth() + "*" + getHeight()); return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2 + getPaddingLeft(); } /** * Get the Centre of the View * * @return The centre of the given view. */ private static int getCenterOfView(View view) { /*Log.e("ChildView Width+Height", view.getWidth() + "*" + view.getHeight());*/ return view.getLeft() + view.getWidth() / 2; } /** * {@inheritDoc} * * @see #setStaticTransformationsEnabled(boolean) */ protected boolean getChildStaticTransformation(View child, Transformation t) { final int childCenter = getCenterOfView(child); final int childWidth = child.getWidth(); int rotationAngle = 0; t.clear(); t.setTransformationType(Transformation.TYPE_MATRIX); if (childCenter == mCoveflowCenter) { transformImageBitmap((ImageView) child, t, 0); } else { rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle); if (Math.abs(rotationAngle) > mMaxRotationAngle) { rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle: mMaxRotationAngle; } transformImageBitmap((ImageView) child, t, rotationAngle); } return true; } /** * This is called during layout when the size of this view has changed. If * you were just added to the view hierarchy, you're called with the old * values of 0. * * @param w * Current width of this view. * @param h * Current height of this view. * @param oldw * Old width of this view. * @param oldh * Old height of this view. */ protected void onSizeChanged(int w, int h, int oldw, int oldh) { mCoveflowCenter = getCenterOfCoverflow(); super.onSizeChanged(w, h, oldw, oldh); } /** * Transform the Image Bitmap by the Angle passed * * @param imageView * ImageView the ImageView whose bitmap we want to rotate * @param t * transformation * @param rotationAngle * the Angle by which to rotate the Bitmap */ private void transformImageBitmap(ImageView child, Transformation t, int rotationAngle) { mCamera.save(); final Matrix imageMatrix = t.getMatrix(); final int imageHeight = child.getLayoutParams().height; final int imageWidth = child.getLayoutParams().width; final int rotation = Math.abs(rotationAngle); // ��Z���������ƶ�camera���ӽǣ�ʵ��Ч��Ϊ�Ŵ�ͼƬ�� // �����Y�����ƶ�����ͼƬ�����ƶ���X���϶�ӦͼƬ�����ƶ��� mCamera.translate(0.0f, 0.0f, 100.0f); // As the angle of the view gets less, zoom in if (rotation < mMaxRotationAngle) { float zoomAmount = (float) (mMaxZoom + (rotation * 1.5)); mCamera.translate(0.0f, 0.0f, zoomAmount); ((ImageView) (child)).setAlpha((int) (255 - rotation * 2.5)); } // ��Y������ת����ӦͼƬ�������﷭ת�� // �����X������ת�����ӦͼƬ�������﷭ת�� mCamera.rotateY(rotationAngle); mCamera.getMatrix(imageMatrix); // Preconcats matrix�൱���ҳ˾���Postconcats matrix�൱����˾��� imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2)); imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2)); mCamera.restore(); } }