android 3d相册实例

          最近因为项目需要，开发了一个android3d相册，试用了一下，基本上还可以，所以就把代码共享出来给大家吧。PS:这个功能有一个问题，就是当照片过大且相册的图潘过多的时候会有内存溢出的问题，弄了好久都没有找到解决办法，所以先把代码贴出来，希望大家给点指教啊！

package com.gallery;import java.io.File;import android.app.Activity;import android.content.Context;import android.content.Intent;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.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.Toast;import android.widget.AdapterView.OnItemClickListener;public class GalleryActivity extends Activity {final String path = "mnt/sdcard/file";private ImageView[] mImages;private String str[]; public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);                   setContentView(R.layout.layout_gallery);        File file = new File(path);        str = file.list();            ImageAdapter adapter = new ImageAdapter(this, str);        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();                Intent intent = new Intent();                intent.putExtra("path", path+"/"+str[position]);                intent.setClass(GalleryActivity.this, EditPhotoActivity.class);                GalleryActivity.this.startActivity(intent);            }                   });        galleryFlow.setSelection(0);    }  public class ImageAdapter extends BaseAdapter{int mGalleryItemBackground;    private Context mContext;    //private Integer[] mImageIds;    private String[] mImageIds;           public ImageAdapter(Context c, String[] 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 (String imageId : mImageIds) {      BitmapFactory.Options options = new BitmapFactory.Options();      options.inSampleSize = 4;//图片宽高都为原来的二分之一，即图片为原来的四分之一      //返回原图解码之后的bitmap对象      Bitmap originalImage = BitmapFactory.decodeFile(path+"/"+imageId,options);      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)));    }}}

package com.gallery;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 = -120;////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) {        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();    }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical"     android:background="#1E90FF">    <com.gallery.GalleryFlow                 android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:id="@+id/Gallery01"        /></LinearLayout>

代码是完整的，大家只要配上照片路径就可以使用了！