android Gallery3D效果

主页面：Gallery3DActivitypackage com.xiawenquan;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.Toast;import android.widget.AdapterView.OnItemClickListener;public class Gallery3DActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.main);                   Integer[] images = { R.drawable.aa, R.drawable.bb,                   R.drawable.cc, R.drawable.dd, R.drawable.ee,                   R.drawable.ff, /* R.drawable.gg,R.drawable.hh ,                R.drawable.jj, R.drawable.kk, R.drawable.ll*/};                      ImageAdapter adapter = new ImageAdapter(this, images);           adapter.createReflectedImages();//创建倒影效果           GalleryFlow galleryFlow = (GalleryFlow) Gallery3DActivity.this.findViewById(R.id.Gallery01);           galleryFlow.setFadingEdgeLength(0);           galleryFlow.setSpacing(-50); //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(0);       }   }

GalleryFlow类：作用是控制Gallerypackage com.xiawenquan;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();//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)    @Override    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;    }        @Override    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, 10.0f, 300.0f);// 后面的值越高图片越缩小        // 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();    }}

最后是把图片设置到Gallery中ImageAdapter类：package com.xiawenquan;import android.content.Context;import android.content.res.Resources;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.LinearGradient;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PorterDuffXfermode;import android.graphics.Bitmap.Config;import android.graphics.Shader.TileMode;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ImageView.ScaleType;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(220, 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)));       }   }

main.xml<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"     android:layout_width="fill_parent"    android:layout_height="fill_parent" ><com.xiawenquan.GalleryFlowandroid:id="@+id/Gallery01"android:layout_marginTop="20dip"android:layout_width="fill_parent"android:layout_height="wrap_content"/></LinearLayout>

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