Android Gallery 3D效果（有图有真相）

--------------------.java

package gongzibai.co.cc;

import java.util.ArrayList;

import android.app.Activity;
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.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.Gallery;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.Toast;

public class Gallery1Activity extends
Activity {
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);

gallery.setAdapter(imageAdapter);

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() {
// int flag = 1;
//
// public void run() {
//
// while (true) {
//
// handler.sendEmptyMessage(CHANGE_BANNER);
//
// try {
//
// Thread.sleep(1000);
//
// } 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 {
// private ArrayList<byte[]> dishImages = new ArrayList<byte[]>();
// private ImageView[] mImages;

Context context;
int[] imgResId = new int[] {
R.drawable.icon,
R.drawable.icon2,
R.drawable.icon3,
R.drawable.icon,
R.drawable.icon2,
R.drawable.icon3,

};

public ImageAdapter(
Gallery1Activity gallery1Activity) {
// TODO Auto-generated constructor stub
super();
this.context = gallery1Activity;
}

//public boolean createReflectedImages() {
//final int reflectionGap = 4;
//int index = 0;
//System.out
//.println("dishImages size "
//+ dishImages
//.size());
//for (int i = 0; i < dishImages
//.size(); ++i) {
//System.out
//.println("dishImage --- "
//+ dishImages
//.get(i));
//Bitmap originalImage = BitmapFactory
//.decodeByteArray(
//dishImages
//.get(i),
//0,
//dishImages
//.get(i).length);
//int width = originalImage
//.getWidth();
//int height = originalImage
//.getHeight();
//Matrix matrix = new Matrix();
//matrix.preScale(1, -1);
//Bitmap reflectionImage = Bitmap
//.createBitmap(
//originalImage,
//0,
//height / 2,
//width,
//height / 2,
//matrix,
//false);
//
//Bitmap bitmapWithReflection = Bitmap
//.createBitmap(
//width,
//(height + height / 2),
//Config.ARGB_8888);
//
//Canvas canvas = new Canvas(
//bitmapWithReflection);
//canvas.drawBitmap(
//originalImage,
//0, 0, null);
//Paint deafaultPaint = new Paint();
//canvas.drawRect(
//0,
//height,
//width,
//height
//+ reflectionGap,
//deafaultPaint);
//canvas.drawBitmap(
//reflectionImage,
//0,
//height
//+ reflectionGap,
//null);
//Paint paint = new Paint();
//LinearGradient shader = new LinearGradient(
//0,
//originalImage
//.getHeight(),
//0,
//bitmapWithReflection
//.getHeight()
//+ reflectionGap,
//0x70ffffff,
//0x00ffffff,
//TileMode.CLAMP);
//paint.setShader(shader);
//paint.setXfermode(new PorterDuffXfermode(
//Mode.DST_IN));
//canvas.drawRect(
//0,
//height,
//width,
//bitmapWithReflection
//.getHeight()
//+ reflectionGap,
//paint);
//ImageView imageView = new ImageView(
//context);
//imageView
//.setImageBitmap(bitmapWithReflection);
imageView.setLayoutParams(new GalleryFlow.LayoutParams(180,
240));
//imageView
//.setLayoutParams(new DetialGallery.LayoutParams(
//170,
//200));
//imageView.setScaleType(ScaleType.FIT_XY);
//mImages[index++] = imageView;
//}
//return true;
//}

@Override
public int getCount() {
// TODO Auto-generated method stub
// return Integer.MAX_VALUE;
return Integer.MAX_VALUE;

}

@Override
public Object getItem(
int position) {
// TODO Auto-generated method stub

return position;
//
// return position;
// return position;

}

@Override
public long getItemId(
int position) {
// TODO Auto-generated method stub
return position;
}

@Override
public View getView(int arg0,
View arg1,
ViewGroup arg2) {
// TODO Auto-generated method stub
ImageView imageView = new ImageView(
context);
imageView
.setImageResource(imgResId[arg0
% imgResId.length]);
imageView
.setScaleType(ImageView.ScaleType.FIT_XY);
imageView
.setLayoutParams(new DetialGallery.LayoutParams(
175, 200));

return imageView;

}

}
}

-----------------------.java DetialGallery

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();
private int mMaxRotationAngle = 45;
private int mMaxZoom = -120;
private int mCoveflowCenter;

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 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;
}

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) {
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);

// 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);

// 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);
}
// 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();
}

//
// private boolean isScrollingLeft(
// MotionEvent e1,
// MotionEvent e2) {
// return e2.getX() > e1.getX();
// }

@Override
public boolean onFling(
MotionEvent e1,
MotionEvent e2,
float velocityX,
float velocityY) {
// int keyCode;
// if (isScrollingLeft(e1, e2)) {
// keyCode = KeyEvent.KEYCODE_DPAD_LEFT;
// } else {
// keyCode = KeyEvent.KEYCODE_DPAD_RIGHT;
// }
// onKeyDown(keyCode, null);
return false;
}

}

-------------------.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="10dp"
android:unselectedAlpha="0.5" />

</LinearLayout>