Android实现CoverFlow效果

先上一张效果图:
Android实现CoverFlow效果

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gettersetter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

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