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!

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