先自定義一個Gallery類：
package com.android.ImageGallery3D;
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;
public class GalleryFlow extends Gallery{
private Camera mCamera = new Camera();//相機類
private int mMaxRotationAngle = 60;//最大轉動角度
private int mMaxZoom = -300;//最大縮放值
private int mCoveflowCenter;//半徑值
public GalleryFlow(Context context) {
super(context);
//支持轉換，執行getChildStaticTransformation方法
this.setStaticTransformationsEnabled(true);
}
public GalleryFlow(Context context, AttributeSet attrs) {
super(context, attrs);
this.setStaticTransformationsEnabled(true);
}
public GalleryFlow(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.setStaticTransformationsEnabled(true);
}
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) {
System.out.println("view left :"+view.getLeft());
System.out.println("view width :"+view.getWidth());
return view.getLeft() + view.getWidth() / 2;
}
//控制gallery中每個圖片的旋轉(重寫的gallery中方法)
protected boolean getChildStaticTransformation(View child, Transformation t) {
//取得當前子view的半徑值
final int childCenter = getCenterOfView(child);
System.out.println("childCenter："+childCenter);
final int childWidth = child.getWidth();
//旋轉角度
int rotationAngle = 0;
//重置轉換狀態
t.clear();
//設置轉換類型
t.setTransformationType(Transformation.TYPE_MATRIX);
//如果圖片位於中心位置不需要進行旋轉
if (childCenter == mCoveflowCenter) {
transformImageBitmap((ImageView) child, t, 0);
} else {
//根據圖片在gallery中的位置來計算圖片的旋轉角度
rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
System.out.println("rotationAngle:" +rotationAngle);
//如果旋轉角度絕對值大於最大旋轉角度返回（-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) {
//對效果進行保存
mCamera.save();
final Matrix imageMatrix = t.getMatrix();
//圖片高度
final int imageHeight = child.getLayoutParams().height;
//圖片寬度
final int imageWidth = child.getLayoutParams().width;
//返回旋轉角度的絕對值
final int rotation = Math.abs(rotationAngle);
// 在Z軸上正向移動camera的視角，實際效果爲放大圖片。
// 如果在Y軸上移動，則圖片上下移動；X軸上對應圖片左右移動。
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軸上旋轉，對應圖片豎向向裏翻轉。
// 如果在X軸上旋轉，則對應圖片橫向向裏翻轉。
mCamera.rotateY(rotationAngle);
mCamera.getMatrix(imageMatrix);
imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));
imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));
mCamera.restore();
}
} package com.android.ImageGallery3D;
import android.content.Context;
import android.content.res.Resources;
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.Shader.TileMode;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
public 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];
}
/**
* 創建倒影效果
* @return
*/
public boolean createReflectedImages() {
//倒影圖和原圖之間的距離
final int reflectionGap = 4;
int index = 0;
for (int imageId : mImageIds) {
//返回原圖解碼之後的bitmap對象
Bitmap originalImage = BitmapFactory.decodeResource(mContext.getResources(), imageId);
int width = originalImage.getWidth();
int height = originalImage.getHeight();
//創建矩陣對象
Matrix matrix = new Matrix();
//指定一個角度以0,0爲座標進行旋轉
// matrix.setRotate(30);
//指定矩陣(x軸不變，y軸相反)
matrix.preScale(1, -1);
//將矩陣應用到該原圖之中，返回一個寬度不變，高度爲原圖1/2的倒影位圖
Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
height/2, width, height/2, matrix, false);
//創建一個寬度不變，高度爲原圖+倒影圖高度的位圖
Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
(height + height / 2), Config.ARGB_8888);
//將上面創建的位圖初始化到畫布
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);
/**
* 參數一:爲漸變起初點座標x位置，
* 參數二:爲y軸位置，
* 參數三和四:分辨對應漸變終點，
* 最後參數爲平鋪方式，
* 這裏設置爲鏡像Gradient是基於Shader類，所以我們通過Paint的setShader方法來設置這個漸變
*/
LinearGradient shader = new LinearGradient(0,originalImage.getHeight(), 0,
bitmapWithReflection.getHeight() + reflectionGap,0x70ffffff, 0x00ffffff, TileMode.MIRROR);
//設置陰影
paint.setShader(shader);
paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.DST_IN));
//用已經定義好的畫筆構建一個矩形陰影漸變效果
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()+ reflectionGap, paint);
//創建一個ImageView用來顯示已經畫好的bitmapWithReflection
ImageView imageView = new ImageView(mContext);
imageView.setImageBitmap(bitmapWithReflection);
//設置imageView大小 ，也就是最終顯示的圖片大小
imageView.setLayoutParams(new GalleryFlow.LayoutParams(300, 400));
//imageView.setScaleType(ScaleType.MATRIX);
mImages[index++] = imageView;
}
return true;
}
@SuppressWarnings("unused")
private Resources getResources() {
return null;
}
public int getCount() {
return mImageIds.length;
}
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];
}
public float getScale(boolean focused, int offset) {
return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));
}
}
package com.android.ImageGallery3D;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class ImageGallery3DActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Integer[] images = { R.drawable.gallery_photo_2,
R.drawable.gallery_photo_2,
R.drawable.gallery_photo_2,
R.drawable.gallery_photo_2,
R.drawable.gallery_photo_2,
R.drawable.gallery_photo_2,
R.drawable.gallery_photo_2,
R.drawable.gallery_photo_2};
ImageAdapter adapter = new ImageAdapter(this, images);
adapter.createReflectedImages();//創建倒影效果
GalleryFlow galleryFlow = (GalleryFlow) this.findViewById(R.id.gallery_id);
galleryFlow.setFadingEdgeLength(0);
galleryFlow.setSpacing(-100); //圖片之間的間距
galleryFlow.setAdapter(adapter);
galleryFlow.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
Toast.makeText(getApplicationContext(), String.valueOf(position), Toast.LENGTH_SHORT).show();
}
});
galleryFlow.setSelection(4);
}
}①加載大的圖片如何避免memory leak
②如何優化界面，讓看起來3D效果更加明顯些，還可以對每個圖片增加邊框光暈效果
③如何實現加載SD卡上的圖片或者視頻資源來顯示或者播放
④適合實現網絡的圖片或者視頻的顯示和播放
這四點將在後面繼續通過實例來聯繫