CoverFlow 源码

 效果图差不多这样子

 

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 CoverFlow extends Gallery {
 
 private Camera mCamera = new Camera();
 private int mMaxRotationAngle = 50;
 private int mMaxZoom = -380;
 private int mCoveflowCenter;
 private boolean mAlphaMode = true;
 private boolean mCircleMode = false;
 public CoverFlow(Context context) {
  super(context);
  this.setStaticTransformationsEnabled(true);
 }
 public CoverFlow(Context context, AttributeSet attrs) {
  super(context, attrs);
  this.setStaticTransformationsEnabled(true);
 }
 public CoverFlow(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 boolean getCircleMode() {
  return mCircleMode;
 }
 public void setCircleMode(boolean isCircle) {
  mCircleMode = isCircle;
 }
 public boolean getAlphaMode() {
  return mAlphaMode;
 }
 public void setAlphaMode(boolean isAlpha) {
  mAlphaMode = isAlpha;
 }
 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;
 }
 protected boolean getChildStaticTransformation(View child, Transformation t) {
  final int childCenter = getCenterOfView(child);
  final int childWidth = child.getWidth();
  int rotationAngle = 0;
  t.clear();
  t.setTransformationType(Transformation.TYPE_MATRIX);
  if (childCenter == mCoveflowCenter) {
   transformImageBitmap((ImageView) child, t, 0);
  } else {
   rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
   if (Math.abs(rotationAngle) > mMaxRotationAngle) {
    rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle
      : mMaxRotationAngle;
   }
   transformImageBitmap((ImageView) child, t, rotationAngle);
  }
  return true;
 }
 /**
  * This is called during layout when the size of this view has changed. If
  * you were just added to the view hierarchy, you're called with the old
  * values of 0.
  * 
  * @param w
  *            Current width of this view.
  * @param h
  *            Current height of this view.
  * @param oldw
  *            Old width of this view.
  * @param oldh
  *            Old height of this view.
  */
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  mCoveflowCenter = getCenterOfCoverflow();
  super.onSizeChanged(w, h, oldw, oldh);
 }
 /**
  * Transform the Image Bitmap by the Angle passed
  * 
  * @param imageView
  *            ImageView the ImageView whose bitmap we want to rotate
  * @param t
  *            transformation
  * @param rotationAngle
  *            the Angle by which to rotate the Bitmap
  */
 private void transformImageBitmap(ImageView child, Transformation t,
   int rotationAngle) {
  mCamera.save();
  final Matrix imageMatrix = t.getMatrix();
  final int imageHeight = child.getLayoutParams().height;
  final int imageWidth = child.getLayoutParams().width;
  final int rotation = Math.abs(rotationAngle);
  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);
   if (mCircleMode) {
    if (rotation < 40)
     mCamera.translate(0.0f, 155, 0.0f);
    else
     mCamera.translate(0.0f, (255 - rotation * 2.5f), 0.0f);
   }
   if (mAlphaMode) {
    ((ImageView) (child)).setAlpha((int) (255 - rotation * 2.5));
   }
  }
  mCamera.rotateY(rotationAngle);
  mCamera.getMatrix(imageMatrix);
  imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));
  imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));
  mCamera.restore();
 }
}


import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;

import com.mmb.shop.R;
import com.mmb.shop.view.CoverFlow;

public class TestActivity extends Activity {
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
 
		CoverFlow cf = new CoverFlow(this); 
		//cf.setBackgroundResource(R.drawable.icon);////
		cf.setAdapter(new ImageAdapter(this)); 
		ImageAdapter imageAdapter = new ImageAdapter(this);
		cf.setAdapter(imageAdapter);
//		cf.setAlphaMode(false); 
//		cf.setCircleMode(false);
//		cf.setSelection(3, true);  
		cf.setAnimationDuration(1000);
		setContentView(cf);
	}
 
 
 
	public class ImageAdapter extends BaseAdapter {
		private Context mContext;
		private Integer[] mImageIds = { 
				R.drawable.a,
				R.drawable.b,
				R.drawable.c,
				R.drawable.d,
				R.drawable.e,
				R.drawable.f,
				R.drawable.g
				};
 
		public ImageAdapter(Context c) {
			mContext = c;
		}
		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) {
			//ReflectionImage image = new ReflectionImage(mContext);
			ImageView image = new ImageView(mContext);
			image.setImageResource(mImageIds[position]);
			image.setLayoutParams(new CoverFlow.LayoutParams(96, 76));
			image.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
			// Make sure we set anti-aliasing otherwise we get jaggies
			BitmapDrawable drawable = (BitmapDrawable) image.getDrawable();
			drawable.setAntiAlias(true);
			return image;
		}
 
		public float getScale(boolean focused, int offset) {
			return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));
		}
	}


}

ReflectionImage 
import android.content.Context;  
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.PorterDuff.Mode;  
import android.graphics.Shader.TileMode;  
import android.graphics.drawable.BitmapDrawable;  
import android.util.AttributeSet;  
import android.widget.ImageView;  
/**
 * 
 * @author 
 */
public class ReflectionImage extends ImageView {  
    //是否为Reflection模式   
    private boolean mReflectionMode = true;  
    public ReflectionImage(Context context) {  
        super(context);  
    }  
    public ReflectionImage(Context context, AttributeSet attrs) {  
        super(context, attrs);  
        //取得原始图片的bitmap并重画   
        Bitmap originalImage = ((BitmapDrawable)this.getDrawable()).getBitmap();  
        doReflection(originalImage);  
    }  
    public ReflectionImage(Context context, AttributeSet attrs,  
            int defStyle) {  
        super(context, attrs, defStyle);  
        Bitmap originalImage = ((BitmapDrawable)this.getDrawable()).getBitmap();  
        doReflection(originalImage);  
    }  
    public void setReflectionMode(boolean isRef) {  
        mReflectionMode = isRef;  
    }  
    public boolean getReflectionMode() {  
        return mReflectionMode;  
    }  
    //偷懒了,只重写了setImageResource,和构造函数里面干了同样的事情   
    @Override  
    public void setImageResource(int resId) {  
        Bitmap originalImage = BitmapFactory.decodeResource(  
                getResources(), resId);  
        doReflection(originalImage);  
        //super.setImageResource(resId);   
    }  
    private void doReflection(Bitmap originalImage) {  
        final int reflectionGap = 4;                            //原始图片和反射图片中间的间距   
        int width = originalImage.getWidth();  
        int height = originalImage.getHeight();  
          
        //反转   
        Matrix matrix = new Matrix();  
        matrix.preScale(1, -1);  
      //reflectionImage就是下面透明的那部分,可以设置它的高度为原始的3/4,这样效果会更好些   
        Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,  
                0, width, height, matrix, false);  
        //创建一个新的bitmap,高度为原来的两倍   
        Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height), Config.ARGB_8888);  
        Canvas canvasRef = new Canvas(bitmapWithReflection);  
          
        //先画原始的图片   
        canvasRef.drawBitmap(originalImage, 0, 0, null);  
        //画间距   
        Paint deafaultPaint = new Paint();  
        canvasRef.drawRect(0, height, width, height + reflectionGap, deafaultPaint);  
          
        //画被反转以后的图片   
        canvasRef.drawBitmap(reflectionImage, 0, height + reflectionGap, null);  
        // 创建一个渐变的蒙版放在下面被反转的图片上面   
        Paint paint = new Paint();  
        LinearGradient shader = new LinearGradient(0,  
                originalImage.getHeight(), 0, bitmapWithReflection.getHeight()  
                        + reflectionGap, 0x80ffffff, 0x00ffffff, TileMode.CLAMP);  
        // Set the paint to use this shader (linear gradient)   
        paint.setShader(shader);  
        // Set the Transfer mode to be porter duff and destination in   
        paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));  
        // Draw a rectangle using the paint with our linear gradient   
        canvasRef.drawRect(0, height, width, bitmapWithReflection.getHeight()  
                + reflectionGap, paint);  
      //调用ImageView中的setImageBitmap   
        this.setImageBitmap(bitmapWithReflection);  
    }  
}