ReflectionImage类代码:import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.Bitmap.Config;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.LinearGradient;

import android.graphics.Matrix;

import android.graphics.Paint;

import android.graphics.PorterDuff.Mode;

import android.graphics.PorterDuffXfermode;

import android.graphics.Shader.TileMode;

import android.graphics.drawable.BitmapDrawable;

import android.util.AttributeSet;

import android.widget.ImageView;

//图片倒影

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

BitmapDrawable bd = (BitmapDrawable) this.getDrawable();

Bitmap originalImage = bd.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;

}

// 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);

}

}