Android Gallery3D效果 代码
  效果图:

  贴上代码:

1.扩展Gallery:  public class GalleryFlow extends Gallery {  private Camera mCamera = new Camera();//相机类  private int mMaxRotationAngle = 60;//最大转动角度  private int mMaxZoom = -300;////最大缩放值  private int mCoveflowCenter;//半径值  public GalleryFlow(Context context) {  super(context);  //支持转换 ,执行getChildStaticTransformation方法  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) {  System.out.println("view left :"+view.getLeft());  System.out.println("view width :"+view.getWidth());  return view.getLeft() + view.getWidth() / 2;  }  //控制gallery中每个图片的旋转(重写的gallery中方法)  protected boolean getChildStaticTransformation(View child, Transformation t) {  //取得当前子view的半径值  final int childCenter = getCenterOfView(child);  System.out.println("childCenter:"+childCenter);  final int childWidth = child.getWidth();  //旋转角度  int rotationAngle = 0;  //重置转换状态  t.clear();  //设置转换类型  t.setTransformationType(Transformation.TYPE_MATRIX);  //如果图片位于中心位置不需要进行旋转  if (childCenter == mCoveflowCenter) {  transformImageBitmap((ImageView) child, t, 0);  } else {  //根据图片在gallery中的位置来计算图片的旋转角度  rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);  System.out.println("rotationAngle:" +rotationAngle);  //如果旋转角度绝对值大于最大旋转角度返回(-mMaxRotationAngle或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);  }  private void transformImageBitmap(ImageView child, Transformation t,  int rotationAngle) {  //对效果进行保存  mCamera.save();  final Matrix imageMatrix = t.getMatrix();  //图片高度  final int imageHeight = child.getLayoutParams().height;  //图片宽度  final int imageWidth = child.getLayoutParams().width;  //返回旋转角度的绝对值  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));  mCamera.restore();  }  }

  2.填充图片容器(BaseAdapter):

public class ImageAdapter extends BaseAdapter {  int mGalleryItemBackground;  private Context mContext;  private Integer[] mImageIds;  private ImageView[] mImages;  public ImageAdapter(Context c, Integer[] ImageIds) {  mContext = c;  mImageIds = ImageIds;  mImages = new ImageView[mImageIds.length];  }  /**  * 创建倒影效果  * @return  */  public boolean createReflectedImages() {  //倒影图和原图之间的距离  final int reflectionGap = 4;  int index = 0;  for (int imageId : mImageIds) {  //返回原图解码之后的bitmap对象  Bitmap originalImage = BitmapFactory.decodeResource(mContext.getResources(), imageId);  int width = originalImage.getWidth();  int height = originalImage.getHeight();  //创建矩阵对象  Matrix matrix = new Matrix();  //指定一个角度以0,0为坐标进行旋转  // matrix.setRotate(30);  //指定矩阵(x轴不变,y轴相反)  matrix.preScale(1, -1);  //将矩阵应用到该原图之中,返回一个宽度不变,高度为原图1/2的倒影位图  Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,  height/2, width, height/2, matrix, false);  //创建一个宽度不变,高度为原图+倒影图高度的位图  Bitmap bitmapWithReflection = Bitmap.createBitmap(width,  (height + height / 2), Config.ARGB_8888);  //将上面创建的位图初始化到画布  Canvas canvas = new Canvas(bitmapWithReflection);  canvas.drawBitmap(originalImage, 0, 0, null);  Paint deafaultPaint = new Paint();  deafaultPaint.setAntiAlias(false);  //    canvas.drawRect(0, height, width, height + reflectionGap,deafaultPaint);  canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);  Paint paint = new Paint();  paint.setAntiAlias(false);  /**  * 参数一:为渐变起初点坐标x位置,  * 参数二:为y轴位置,  * 参数三和四:分辨对应渐变终点,  * 最后参数为平铺方式,  * 这里设置为镜像Gradient是基于Shader类,所以我们通过Paint的setShader方法来设置这个渐变  */  LinearGradient shader = new LinearGradient(0,originalImage.getHeight(), 0,  bitmapWithReflection.getHeight() + reflectionGap,0x70ffffff, 0x00ffffff, TileMode.MIRROR);  //设置阴影  paint.setShader(shader);  paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.DST_IN));  //用已经定义好的画笔构建一个矩形阴影渐变效果  canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()+ reflectionGap, paint);  //创建一个ImageView用来显示已经画好的bitmapWithReflection  ImageView imageView = new ImageView(mContext);  imageView.setImageBitmap(bitmapWithReflection);  //设置imageView大小 ,也就是最终显示的图片大小  imageView.setLayoutParams(new GalleryFlow.LayoutParams(300, 400));  //imageView.setScaleType(ScaleType.MATRIX);  mImages[index++] = imageView;  }  return true;  }  @SuppressWarnings("unused")  private Resources getResources() {  return null;  }  public int getCount() {  return mImageIds.length;  }  public Object getItem(int position) {  return position;  }  public long getItemId(int position) {  return position;  }  public View getView(int position, View convertView, ViewGroup parent) {  return mImages[position];  }  public float getScale(boolean focused, int offset) {  return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));  }  }

  3.创建Activity:

 public class Gallery3DActivity extends Activity {  public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.layout_gallery);  Integer[] images = { R.drawable.img0001, R.drawable.img0030,  R.drawable.img0100, R.drawable.img0130, R.drawable.img0200,  R.drawable.img0230,  R.drawable.img0330,R.drawable.img0354 };  ImageAdapter adapter = new ImageAdapter(this, images);  adapter.createReflectedImages();//创建倒影效果  GalleryFlow galleryFlow = (GalleryFlow) this.findViewById(R.id.Gallery01);  galleryFlow.setFadingEdgeLength(0);  galleryFlow.setSpacing(-100); //图片之间的间距  galleryFlow.setAdapter(adapter);  galleryFlow.setOnItemClickListener(new OnItemClickListener() {  public void onItemClick(AdapterView<?> parent, View view,  int position, long id) {  Toast.makeText(getApplicationContext(), String.valueOf(position), Toast.LENGTH_SHORT).show();  }  });  galleryFlow.setSelection(4);  }  }

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