---------------------------------------DetialGallery.java
package gongzibai.co.cc;
import android.content.Context;
import android.graphics.Camera;
import android.graphics.Matrix;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Transformation;
import android.widget.Gallery;
import android.widget.ImageView;
public class DetialGallery extends
Gallery {
private Camera mCamera = new Camera();// 相机类
private int mMaxRotationAngle = 60;// 最大转动角度
private int mMaxZoom = -380;// //最大缩放值
private int mCoveflowCenter;// 半径值
private boolean mAlphaMode = true;
private boolean mCircleMode = false;
public DetialGallery(
Context context,
AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}
public int getMaxRotationAngle() {
return mMaxRotationAngle;
}
public void setMaxRotationAngle(
int maxRotationAngle) {
mMaxRotationAngle = maxRotationAngle;
}
public boolean getAlphaMode() {
return mAlphaMode;
}
public void setAlphaMode(
boolean isAlpha) {
mAlphaMode = isAlpha;
}
public boolean getCircleMode() {
return mCircleMode;
}
public void setCircleMode(boolean isCircle) {
mCircleMode = isCircle;
}
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)
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;
}
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, 0.0f,
100.0f);
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));
}
}
// 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 (mAlphaMode) {
// ((ImageView) (child))
// .setAlpha((int) (255 - rotation * 2.5));
// }
//
// }
// 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();
}
@Override
public boolean onFling(
MotionEvent e1,
MotionEvent e2,
float velocityX,
float velocityY) {
// TODO Auto-generated method stub
return false;
}
}
-----------------------------------Gallery1Activity
package gongzibai.co.cc;
import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
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.PorterDuffXfermode;
import android.graphics.Shader.TileMode;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.Toast;
public class Gallery1Activity extends
Activity {
Integer[] imgResId = {
R.drawable.icon,
R.drawable.icon2,
R.drawable.icon3,
R.drawable.icon,
R.drawable.icon2,
R.drawable.icon3,
};
public static final int CHANGE_BANNER = 1;
private int cur_index = 0;
/** Called when the activity is first created. */
@Override
public void onCreate(
Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final DetialGallery gallery = (DetialGallery) findViewById(R.id.widget1);
ImageAdapter imageAdapter = new ImageAdapter(
Gallery1Activity.this,
imgResId);
imageAdapter
.createReflectedImages();// 创建倒影效果
gallery.setFadingEdgeLength(0);
gallery.setAdapter(imageAdapter);
gallery.setSelection(1);
final Handler handler = new Handler() {
public void handleMessage(
Message msg) {
switch (msg.what) {
case CHANGE_BANNER:
gallery.onKeyDown(
KeyEvent.KEYCODE_DPAD_RIGHT,
null);
break;
default:
break;
}
};
};
new Thread(new Runnable() {
public void run() {
while (true) {
handler.sendEmptyMessage(CHANGE_BANNER);
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
).start();
gallery.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(
AdapterView<?> arg0,
View arg1,
int arg2, long arg3) {
// TODO Auto-generated method stub
Toast.makeText(
Gallery1Activity.this,
"这是第" + arg2
+ "张图片",
2).show();
}
@Override
public void onNothingSelected(
AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
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 / 3,
width,
height / 3,
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 DetialGallery.LayoutParams(
170,
300));
imageView
.setScaleType(ScaleType.FIT_XY);
//imageView.setAlpha(80);
mImages[index++] = imageView;
}
return true;
}
@SuppressWarnings("unused")
private Resources getResources() {
return null;
}
public int getCount() {
return Integer.MAX_VALUE;
}
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
% imgResId.length];
}
public float getScale(
boolean focused,
int offset) {
return Math
.max(0,
1.0f / (float) Math
.pow(2,
Math.abs(offset)));
}
}
}
-----------------------.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/widget32"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<gongzibai.co.cc.DetialGallery
android:id="@+id/widget1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:spacing="5dp"
/>
</LinearLayout>
作者：gongzibai
