Android自定义Gallery控件实现3D图片浏览器

private List<String> getImagesFromSD() {     List<String> imageList = new ArrayList<String>();     File f = Environment.getExternalStorageDirectory();     if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {       f = new File(Environment.getExternalStorageDirectory().toString());     } else {       Toast.makeText(MainActivity.this, R.string.sdcarderror, Toast.LENGTH_LONG).show();       return imageList;     }      File[] files = f.listFiles();     if (files == null || files.length == 0)       return imageList;      for (int i = 0; i < files.length; i++) {       File file = files[i];       if (isImageFile(file.getPath()))         imageList.add(file.getPath());     }     return imageList;   } 

private boolean isImageFile(String fName) {     String end = fName.substring(fName.lastIndexOf(".") + 1, fName.length()).toLowerCase();     if (end.equals("jpg") || end.equals("gif") || end.equals("png") || end.equals("jpeg") || end.equals("bmp")) {       return true;     }     return false;    } 

/**  * 3D效果Gallery实现  *  * @time 2014年6月26日 下午9:10:47  */ @SuppressWarnings("deprecation") public class GalleryFlow extends Gallery {    private Camera mCamera = new Camera();   // 两侧图片最大旋转角度   private int mMaxRotationAngle = 60;   private int mMaxZoom = -120;   private int mCoveflowCenter;    public GalleryFlow(Context context) {     super(context);     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);   }    // 设置最大旋转角   public void setMaxRotationAngle(int maxRotationAngle) {     mMaxRotationAngle = maxRotationAngle;   }    // 获取当前控件中心点x轴位置   private int getCenterOfCoverflow() {     return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2 + getPaddingLeft();   }    // 获取view控件的x轴位置   private static int getCenterOfView(View view) {     return view.getLeft() + view.getWidth() / 2;   }    // 默认返回值是false，若设置城true，则每次gallery生成子控件的时候，都会调用这个方法，所以我们可以将返回值设置为true,然后完成child的旋转等变形操作   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);      // 如果child控件在中心位置，则不旋转     if (childCenter == mCoveflowCenter) {       transformImageBitmap((ImageView) child, t, 0);      } else {       // 否则，将当前child控件旋转一定角度       rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);       if (Math.abs(rotationAngle) > mMaxRotationAngle) {         rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle;       }       transformImageBitmap((ImageView) child, t, rotationAngle);     }      return true;   }    //重新计算控件的x轴位置   protected void onSizeChanged(int w, int h, int oldw, int oldh) {     mCoveflowCenter = getCenterOfCoverflow();     super.onSizeChanged(w, h, oldw, oldh);   }    // 将child控件旋转rotationAngle方法的实现   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);     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));      // 恢复相机原状态     mCamera.restore();   } } 

@SuppressWarnings({ "deprecation", "unused" }) public class ImageAdapter extends BaseAdapter {    private Context mContext;   //用于存放图片的路径   private List<String> imageFileList;   //原始图片   private Bitmap originalImage;   //反射的倒影图片，高度为原始图片一半   private Bitmap reflectionImage;   //用于存放处理后的整个图片，高度为原始图片的1.5倍   private Bitmap bitmapWithReflection;   //图片的宽高   private int width;   private int height;   //矩阵   private Matrix matrix;   //画布   private Canvas canvas;   //原始图像与反射的倒影图像之间的间隔高度   final int reflectionGap = 4;   //用于getView返回   private ImageView imageView;   //倒影的阴影模糊效果   private LinearGradient shader;      public ImageAdapter(Context c, List<String> _imageFileList) {      mContext = c;     imageFileList = _imageFileList;     matrix = new Matrix();     //设置为x轴翻转     matrix.preScale(1, -1);        }      @Override   public int getCount() {     return imageFileList.size();   }    @Override   public Object getItem(int position) {     return position;   }    @Override   public long getItemId(int position) {     return position;   }    //返回经过处理的ImageView对象   @Override   public View getView(int position, View convertView, ViewGroup parent) {     return createReflectedImages(imageFileList.get(position));   }      //这是最主要的方法，完成了对图片的倒映效果处理   public ImageView createReflectedImages(String filePath) {      //获取原始图片     originalImage = BitmapFactory.decodeFile(filePath);          width = originalImage.getWidth();     height = originalImage.getHeight();          //创建倒影图像，高度是原始图像的一半，并且使用矩阵进行了x轴反转，也就是倒影效果     reflectionImage = Bitmap.createBitmap(originalImage, 0, height / 2, width, height / 2, matrix, false);     //初始化Bitmap对象，用于存放处理后的图片，高度为原始图片的1.5倍     bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888);     //根据bitmapWithReflection对象，创建一个画布     canvas = new Canvas(bitmapWithReflection);     //先把原始图像画上     canvas.drawBitmap(originalImage, 0, 0, null);          Paint paint = new Paint();     //画出原始图像与反射图像之间的小空隙，高度为reflectionGap     canvas.drawRect(0, height, width, height + reflectionGap, paint);          //画出倒影     canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);     //设置画笔的阴影效果     shader = new LinearGradient(0, originalImage.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff,         TileMode.CLAMP);     paint.setShader(shader);     paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));      //在倒影图上用带阴影的画笔绘制矩形     canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint);     //初始化一个ImageView对象     imageView = new ImageView(mContext);     //将处理后的图像设置为图片资源     imageView.setImageBitmap(bitmapWithReflection);     imageView.setLayoutParams(new Gallery.LayoutParams(120, 160));     imageView.setScaleType(ScaleType.CENTER_INSIDE);     return imageView;   }     } 

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"   android:layout_width="fill_parent"   android:layout_height="fill_parent"   android:background="#F9F900"   android:gravity="center_horizontal"   android:orientation="vertical" >    <com.examole.gallery.GalleryFlow     android:id="@+id/mygallery"     android:layout_width="match_parent"     android:layout_height="100dp"     android:layout_marginTop="20dp"     android:gravity="center_vertical" />    <ImageSwitcher     android:id="@+id/switcher"     android:layout_width="wrap_content"     android:layout_height="match_parent"     android:layout_gravity="center_horizontal" />  </LinearLayout> 

public class MainActivity extends Activity implements AdapterView.OnItemSelectedListener, ViewSwitcher.ViewFactory {    private List<String> ImageList;   private ImageSwitcher mSwitcher;   private Gallery gallery;    @Override   public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     // 获取图片路径     ImageList = getImagesFromSD();     mSwitcher = (ImageSwitcher) findViewById(R.id.switcher);     gallery = (Gallery) findViewById(R.id.mygallery);     // ImageSwitcher控件必须实现ViewSwitcher.ViewFactory接口，然后在makeView方法中，返回我们需要显示的控件即可     mSwitcher.setFactory(this);     // 设置图片的进入和离开的动画效果     mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left));     mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right));     // 给gallery设置适配器     gallery.setAdapter(new ImageAdapter(this, ImageList));     gallery.setOnItemSelectedListener(this);    }    private List<String> getImagesFromSD() {     List<String> imageList = new ArrayList<String>();     File f = Environment.getExternalStorageDirectory();     if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {       f = new File(Environment.getExternalStorageDirectory().toString());     } else {       Toast.makeText(MainActivity.this, R.string.sdcarderror, Toast.LENGTH_LONG).show();       return imageList;     }      File[] files = f.listFiles();     if (files == null || files.length == 0)       return imageList;      for (int i = 0; i < files.length; i++) {       File file = files[i];       if (isImageFile(file.getPath()))         imageList.add(file.getPath());     }     return imageList;   }    @SuppressLint("DefaultLocale")   private boolean isImageFile(String fName) {     String end = fName.substring(fName.lastIndexOf(".") + 1, fName.length()).toLowerCase();     if (end.equals("jpg") || end.equals("gif") || end.equals("png") || end.equals("jpeg") || end.equals("bmp")) {       return true;     }     return false;    }    @Override   public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {     // 当点击上面的小图片的时候，获取图片的绝对路径，然后设置给mSwitcher     String photoURL = ImageList.get(position);     mSwitcher.setImageURI(Uri.parse(photoURL));   }    @Override   public void onNothingSelected(AdapterView<?> parent) {    }    @Override   public View makeView() {     ImageView i = new ImageView(this);     i.setBackgroundColor(0x00000000);     i.setScaleType(ImageView.ScaleType.CENTER_INSIDE);     i.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));     return i;   } }