基于Android的超炫的图片浏览器

package com.sky_dreaming.ACDsee.gallery_view; import android.content.Context; import android.graphics.Camera; import android.graphics.Matrix; import android.util.AttributeSet; import android.view.View; import android.view.animation.Transformation; import android.widget.Gallery; import android.widget.ImageView; /** * **************************************************************** * 文件名称 : GalleryFlow.java * 创建时间 : 2010-11-2 下午05:27:46 * 文件描述 : 自定义Gallery视图，实现图片旋转效果 ***************************************************************** */ public class GalleryFlow extends Gallery { /** * 用于ImageView的矩阵变换 */ private Camera mCamera = new Camera(); private int mMaxRotationAngle = 60; /** * The maximum zoom on the centre Child */ private int mMaxZoom = -120; /** * Coverflow的中心 */ 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 set 方法 * @return */ public int getMaxRotationAngle() { return mMaxRotationAngle; } public void setMaxRotationAngle(int maxRotationAngle) { mMaxRotationAngle = maxRotationAngle; } public int getMaxZoom() { return mMaxZoom; } public void setMaxZoom(int maxZoom) { mMaxZoom = maxZoom; } /** * 获取Coverflow的中心位置 * @return */ private int getCenterOfCoverflow() { return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2 + getPaddingLeft(); } /** * 获取子视图的中心位置 * @param view * @return */ private static int getCenterOfView(View view) { return view.getLeft() + view.getWidth() / 2; } protected boolean getChildStaticTransformation(View child, Transformation t) { final int childCenter = getCenterOfView(child); final int childWidth = child.getWidth(); int rotationAngle = 0; /** * 重置transformation */ t.clear(); t.setTransformationType(Transformation.TYPE_MATRIX); if (childCenter == mCoveflowCenter) { transformImageBitmap((ImageView) child, t, 0); } else { /** * 计算旋转角度 */ rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle); if (Math.abs(rotationAngle) > mMaxRotationAngle) { rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle: mMaxRotationAngle; } transformImageBitmap((ImageView) child, t, rotationAngle); } return true; } protected void onSizeChanged(int w, int h, int oldw, int oldh) { mCoveflowCenter = getCenterOfCoverflow(); super.onSizeChanged(w, h, oldw, oldh); } /** * 将子视图旋转相应角度 ？？？？？？？？？？？？？ * * @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) { /** * 保存相机当前状态 */ mCamera.save(); /** * 获取变换矩阵 */ final Matrix imageMatrix = t.getMatrix(); final int imageHeight = child.getLayoutParams().height; final int imageWidth = child.getLayoutParams().width; final int rotation = Math.abs(rotationAngle); /** * 在Z轴上正向移动camera的视角，实际效果为放大图片。 * 如果在Y轴上移动，则图片上下移动；X轴上对应图片左右移动。 */ 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); } /** * 在Y轴上旋转，对应图片竖向向里翻转。如果在X轴上旋转，则对应图片横向向里翻转。 */ mCamera.rotateY(rotationAngle); mCamera.getMatrix(imageMatrix); imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2)); imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2)); /** * 恢复相机原状态 */ mCamera.restore(); } }