android Gallery3D效果

http://1002878825-qq-com.iteye.com/blog/1194788

 主页面：Gallery3DActivity


 package 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 {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         // TODO Auto-generated method stub
         super.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Gallery

 package 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

 "1.0" encoding="utf-8"?>
 "http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent" >


         android:id="@+id/Gallery01"
         android:layout_marginTop="20dip"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
     />

 

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