android Gallery3D效果 -

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android Gallery3D效果

博客分类：

Gallery3D效果

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

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



</LinearLayout>