*******************************************重写Gallery类用于定义控件样式等******************************************
public class GalleryFlow extends Gallery{
//相机类private Camera mCamera = new Camera();
//最大转动角度private int mMaxRotationAngle = 90;
//最大缩放值
private int mMaxZoom = -280;//半径值
private int mCoveflowCenter; /** * @param context */ 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); } /** * 获取旋转最大角度 */ public int getMaxRotationAngle() { return mMaxRotationAngle; } /** * 设置旋转最大角度 */ public void setMaxRotationAngle(int maxRotationAngle) { mMaxRotationAngle = maxRotationAngle; } /** * 获取最大缩放值 * @return */ public int getMaxZoom() { return mMaxZoom; } /** * 设置最大缩放值 * @param maxZoom */ public void setMaxZoom(int maxZoom) { mMaxZoom = maxZoom; } /** * 获取半径值 * @return */ private int getCenterOfCoverflow() { return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2 + getPaddingLeft(); } /** * * @param view * @return */ 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); 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(); }}=================================================================================================
**********************************重写Adapter类用于给Gallery提供图片*************************************
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 */public boolean createReflectedImages() {
//倒影图和原图之间的距离 final int reflectionGap = 3; 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.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(200, 300)); //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))); }}
=================================================================================================
**********************************************Acitivity中调用一下***************************************
public class GalleryDemoActivity extends Activity { /** Called when the activity is first created. */ public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.main); Integer[] images = { R.drawable.image01, R.drawable.image02, R.drawable.image03, R.drawable.image04, R.drawable.image05}; ImageAdapter adapter = new ImageAdapter(this, images); adapter.createReflectedImages();
//创建倒影效果 GalleryFlow galleryFlow = (GalleryFlow) this.findViewById(R.id.gallery); 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); }}
=================================================================================================
xml是这样写的
<com.example.mgallery3d.GalleryFlow android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/gallery" android:gravity="center_vertical"/>