3D相册（Gallery 3D + 倒影效果） GalleryFlow

package com.image.galleryFlow;

import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;

public class GalleryFlowActivity extends Activity {
	private GalleryFlow galleryFlow;
	private ImageAdapter adapter;
	private GestureDetector detector;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.layout_gallery);

		detector = new GestureDetector(new MyGestureListener());
		int[] images = { R.drawable.p01, R.drawable.p02, R.drawable.p03,
				R.drawable.p04, R.drawable.p05 };
		adapter = new ImageAdapter(this, images);
		adapter.createReflectedImages();

		galleryFlow = (GalleryFlow) findViewById(R.id.gallery_flow);
		galleryFlow.setAdapter(adapter);
		galleryFlow.setSelection(1);
	}

	private class MyGestureListener extends SimpleOnGestureListener {

		@Override
		public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
				float velocityY) {
			// TODO Auto-generated method stub
			int currentPosition = galleryFlow.getSelectedItemPosition();
			if (e1.getX() - e2.getX() > 50 && Math.abs(velocityX) > 100) {
				if (currentPosition + 1 == adapter.getCount()) {
					galleryFlow.setSelection(0);
				} else {
					galleryFlow.setSelection(currentPosition + 1);
				}
			} else if (e2.getX() - e1.getX() > 50 && Math.abs(velocityX) > 100) {
				if (currentPosition - 1 < 0) {
					galleryFlow.setSelection(adapter.getCount() - 1);
				} else {
					galleryFlow.setSelection(currentPosition - 1);
				}
			}
			return super.onFling(e1, e2, velocityX, velocityY);
		}

	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		// TODO Auto-generated method stub
		return detector.onTouchEvent(event);
	}
}

package com.image.galleryFlow;

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;

public class GalleryFlow extends Gallery {
	private Camera mCamera = new Camera();
	private int mMaxRotationAngle = 60;// 最大旋转角度
	private int mMaxZoom = -430;// 最大缩放值
	private int mCoverflowCenter;

	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);
	}

	public int getMaxRotationAngle() {
		return mMaxRotationAngle;
	}

	public void setMaxRotationAngle(int maxRotationAngle) {
		mMaxRotationAngle = maxRotationAngle;
	}

	public int getMaxZoom() {
		return mMaxZoom;
	}

	public void setMaxZoom(int maxZoom) {
		mMaxZoom = maxZoom;
	}

	private int getCenterOfCoverflow() {
		return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2
				+ getPaddingLeft();
	}

	private static int getCenterOfView(View view) {
		return view.getLeft() + view.getWidth() / 2;
	}

	@Override
	protected boolean getChildStaticTransformation(View child, Transformation t) {
		// TODO Auto-generated method stub
		final int childCenter = getCenterOfView(child);
		final int childWidth = child.getWidth();
		int rotationAngle = 0;
		t.clear();
		t.setTransformationType(Transformation.TYPE_MATRIX);
		if (childCenter == mCoverflowCenter) {
			transformImageBitmap((ImageView) child, t, 0);
		} else {
			rotationAngle = (int) (((float) (mCoverflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
			if (Math.abs(rotationAngle) > mMaxRotationAngle) {
				rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle
						: mMaxRotationAngle;
			}
			transformImageBitmap((ImageView) child, t, rotationAngle);
		}
		return true;
	}

	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);
		mCamera.translate(0.0f, 0.0f, 100.0f);
		if (rotation < mMaxRotationAngle) {
			float zoomAmount = (float) (mMaxZoom + (rotation * 1.5));
			mCamera.translate(0.0f, 0.0f, zoomAmount);
		}
		mCamera.rotateY(rotationAngle);
		mCamera.getMatrix(imageMatrix);
		imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));
		imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));
		mCamera.restore();
	}

	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
		mCoverflowCenter = getCenterOfCoverflow();
		super.onSizeChanged(w, h, oldw, oldh);
	}

}

package com.image.galleryFlow;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Shader.TileMode;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter {
	int mGalleryItemBackground;
	private Context mContext;
	private int[] mImageIds;
	private ImageView[] mImages;

	public ImageAdapter(Context c, int[] ImageIds) {
		mContext = c;
		mImageIds = ImageIds;
		mImages = new ImageView[mImageIds.length];
	}

	public void createReflectedImages() {
		// TODO Auto-generated method stub
		final int reflectionGap = 4;
		int index = 0;
		for (int imageId : mImageIds) {
			Bitmap originalImage = BitmapFactory.decodeResource(
					mContext.getResources(), imageId);
			int width = originalImage.getWidth();
			int height = originalImage.getHeight();
			Matrix matrix = new Matrix();
			matrix.preScale(1, -1);
			Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
					height / 2, width, height / 2, matrix, false);
			Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
					(height + height / 2), Config.ARGB_8888);
			Canvas canvas = new Canvas(bitmapWithReflection);
			canvas.drawBitmap(originalImage, 0, 0, null);
			Paint defaultPaint = new Paint();
			canvas.drawRect(0, height, width, height + reflectionGap,
					defaultPaint);
			canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
			Paint paint = new Paint();
			LinearGradient shader = new LinearGradient(0,
					originalImage.getHeight(), 0,
					bitmapWithReflection.getHeight() + reflectionGap,
					0x70ffffff, 0x00ffffff, TileMode.CLAMP);
			paint.setShader(shader);
			paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
			canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
					+ reflectionGap, paint);
			ImageView imageView = new ImageView(mContext);
			imageView.setImageBitmap(bitmapWithReflection);
			imageView.setLayoutParams(new GalleryFlow.LayoutParams(160, 240));
			mImages[index++] = imageView;
		}

	}

	public int getCount() {
		// TODO Auto-generated method stub
		return mImageIds.length;
	}

	public Object getItem(int position) {
		// TODO Auto-generated method stub
		return position;
	}

	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return position;
	}

	public View getView(int position, View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		return mImages[position];
	}

	public float getScale(boolean focused, int offset) {
		return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));
	}
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ffffff"
    android:orientation="vertical" >

    <com.image.galleryFlow.GalleryFlow
        android:id="@+id/gallery_flow"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_centerInParent="true"
        android:spacing="1dp"
        android:text="@string/hello" />

</RelativeLayout>