Android实现CoverFlow效果

先上一张效果图：

代码，看了代码什么都明白

CoverFlow从Gallery继承过来

package com.coverflow;

<wbr></wbr><wbr></wbr>

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;

<wbr></wbr><wbr></wbr>

public class CoverFlow extends Gallery {

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>private Camera mCamera = new Camera();

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>private int mMaxRotationAngle = 50;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>private int mMaxZoom = -380;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>private int mCoveflowCenter;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>private boolean mAlphaMode = true;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>private boolean mCircleMode = false;

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public CoverFlow(Context context) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>super(context);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>this.setStaticTransformations<wbr>Enabled(</wbr>true);

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public CoverFlow(Context context, AttributeSet attrs) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>super(context, attrs);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>this.setStaticTransformations<wbr>Enabled(</wbr>true);

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public CoverFlow(Context context, AttributeSet attrs, int defStyle) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>super(context, attrs, defStyle);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>this.setStaticTransformations<wbr>Enabled(</wbr>true);

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public int getMaxRotationAngle() {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>return mMaxRotationAngle;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public void setMaxRotationAngle(int maxRotationAngle) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>mMaxRotationAngle = maxRotationAngle;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public boolean getCircleMode() {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>return mCircleMode;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public void setCircleMode(boolean isCircle) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>mCircleMode = isCircle;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public boolean getAlphaMode() {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>return mAlphaMode;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public void setAlphaMode(boolean isAlpha) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>mAlphaMode = isAlpha;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public int getMaxZoom() {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>return mMaxZoom;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public void setMaxZoom(int maxZoom) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>mMaxZoom = maxZoom;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>private int getCenterOfCoverflow() {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>+ getPaddingLeft();

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>private static int getCenterOfView(View view) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>return view.getLeft() + view.getWidth() / 2;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>protected boolean getChildStaticTransforma<wbr>tion(View child, Transformation t) {</wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>final int childCenter = getCenterOfView(child);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>final int childWidth = child.getWidth();

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>int rotationAngle = 0;

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>t.clear();

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>t.setTransformationType(Transformation.TYPE_MATRIX);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>if (childCenter == mCoveflowCenter) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>transformImageBitmap((ImageView) child, t, 0);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>} else {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>if (Math.abs(rotationAngle) > mMaxRotationAngle) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>: mMaxRotationAngle;

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>}

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>transformImageBitmap((ImageView) child, t, rotationAngle);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>}

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>return true;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>protected void onSizeChanged(int w, int h, int oldw, int oldh) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>mCoveflowCenter = getCenterOfCoverflow();

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>super.onSizeChanged(w, h, oldw, oldh);

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>private void transformImageBitmap(ImageView child, Transformation t,

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>int rotationAngle) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>mCamera.save();

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>final Matrix imageMatrix = t.getMatrix();

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>final int imageHeight = child.getLayoutParams().height;

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>final int imageWidth = child.getLayoutParams().width;

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>final int rotation = Math.abs(rotationAngle);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>mCamera.translate(0.0f, 0.0f, 100.0f);

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>// 如视图的角度更少,放大

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>if (rotation <= mMaxRotationAngle) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>float zoomAmount = (float) (mMaxZoom + (rotation * 1.5));

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>mCamera.translate(0.0f, 0.0f, zoomAmount);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>if (mCircleMode) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>if (rotation < 40)

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>mCamera.translate(0.0f, 155, 0.0f);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>else

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>mCamera.translate(0.0f, (255 - rotation * 2.5f), 0.0f);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>}

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>if (mAlphaMode) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>((ImageView) (child)).setAlpha((int) (255 - rotation * 2.5));

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>}

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>}

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>mCamera.rotateY(rotationAngle);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>mCamera.getMatrix(imageMatrix);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>mCamera.restore();

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

}

这个就是CoverFlow类，说明几点：
1. 成员函数
mCamera是用来做类3D效果处理,比如z轴方向上的平移,绕y轴的旋转等
mMaxRotationAngle是图片绕y轴最大旋转角度,也就是屏幕最边上那两张图片的旋转角度
mMaxZoom是图片在z轴平移的距离,视觉上看起来就是放大缩小的效果.
其他的变量都可以无视
也就是说把这个属性设成true的时候每次viewGroup(看Gallery的源码就可以看到它是从ViewGroup间接继承过来的)在重新画它的child的时候都会促发getChildStaticTransforma<wbr>tion</wbr>这个函数,所以我们只需要在这个函数里面去加上旋转和放大的操作就可以了
其他的getter和setter函数都可以无视

ImageAdapter适配器：

<wbr></wbr>

package com.coverflow;

<wbr></wbr><wbr></wbr>

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.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ImageView;

<wbr></wbr><wbr></wbr>

import com.gallery.R;

<wbr></wbr><wbr></wbr>

public class ImageAdapter extends BaseAdapter {

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>int mGalleryItemBackground;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>private Context mContext;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>private Integer[] mImageIds = {<wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>R.drawable.a1,

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>R.drawable.a2,<wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>R.drawable.a3,

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>R.drawable.a4,<wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>R.drawable.a5 };

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public ImageAdapter(Context c) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>mContext = c;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public int getCount() {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>return mImageIds.length;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public Object getItem(int position) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>return position;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public long getItemId(int position) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>return position;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public View getView(int position, View convertView, ViewGroup parent) {

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>ImageView i = createReflectedImages(mContext,mImageIds[position]);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>i.setLayoutParams(new CoverFlow.LayoutParams(120, 100));

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>i.setScaleType(ImageView.ScaleType.CENTER_INSIDE);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>// 设置的抗锯齿

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>BitmapDrawable drawable = (BitmapDrawable) i.getDrawable();

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>drawable.setAntiAlias(true);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>return i;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public float getScale(boolean focused, int offset) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public ImageView createReflectedImages(Context mContext,int imageId) {

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>Bitmap originalImage = BitmapFactory.decodeResource(mContext.getResources(), imageId);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>final int reflectionGap = 4;

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>int width = originalImage.getWidth();

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>int height = originalImage.getHeight();

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>Matrix matrix = new Matrix();

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>matrix.preScale(1, -1);

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>height / 2, width, height / 2, matrix, false);

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>Bitmap bitmapWithReflection = Bitmap.createBitmap(width,

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>(height + height / 2), Config.ARGB_8888);

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>Canvas canvas = new Canvas(bitmapWithReflection);

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>canvas.drawBitmap(originalImage, 0, 0, null);

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>Paint deafaultPaint = new Paint();

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint);

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>Paint paint = new Paint();

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>LinearGradient shader = new LinearGradient(0, originalImage

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>.getHeight(), 0, bitmapWithReflection.getHeight()

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>+ reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.MIRROR);

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>paint.setShader(shader);

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>+ reflectionGap, paint);

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>ImageView imageView = new ImageView(mContext);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>imageView.setImageBitmap(bitmapWithReflection);

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>return imageView;

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr><wbr></wbr>

}

BitmapDrawable drawable = (BitmapDrawable) i.getDrawable();
drawable.setAntiAlias(true);
是保证图片绕Y旋转了以后不会出现锯齿.

下面是Activity：

package com.coverflow;

<wbr></wbr><wbr></wbr>

import android.app.Activity;

import android.graphics.Color;

import android.os.Bundle;

<wbr></wbr><wbr></wbr>

import com.gallery.R;

<wbr></wbr><wbr></wbr>

public class HelloAndroid extends Activity {

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>@Override

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>public void onCreate(Bundle savedInstanceState) {

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>super.onCreate(savedInstanceState);

<wbr></wbr><wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>CoverFlow cf = new CoverFlow(this);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>// cf.setBackgroundResource(R.drawable.shape);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>cf.setBackgroundColor(Color.BLACK);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>cf.setAdapter(new ImageAdapter(this));

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>ImageAdapter imageAdapter = new ImageAdapter(this);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>cf.setAdapter(imageAdapter);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>// cf.setAlphaMode(false);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>// cf.setCircleMode(false);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>cf.setSelection(2, true);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>cf.setAnimationDuration(1000);

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>setContentView(cf);

<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>}

<wbr></wbr><wbr></wbr>

}

参考自：

参考自：
http://www.eoeandroid.com/thread-70209-1-1.html
http://www.apkbus.com/android-18441-1-1.html

本文转载自：http://blog.sina.com.cn/s/blog_8ae46d1501011c3o.html