Android控件开发之Gallery3D效果

package xiaosi.GalleryFlow;import android.app.Activity;import android.os.Bundle;public class GalleryFlowActivity extends Activity {public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);                        setContentView(R.layout.main);                Integer[] images = { R.drawable.a, R.drawable.b,                R.drawable.c, R.drawable.d, R.drawable.e,                };                ImageAdapter adapter = new ImageAdapter(this, images);        adapter.createReflectedImages();        GalleryFlow galleryFlow = (GalleryFlow) findViewById(R.id.Gallery01);        galleryFlow.setAdapter(adapter);        }}

ImageAdapter.java

package xiaosi.GalleryFlow;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.PorterDuff.Mode;import android.graphics.Shader.TileMode;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ImageView.ScaleType;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];     }     public boolean createReflectedImages()      {         final int reflectionGap = 4;         int index = 0;         for (int imageId : mImageIds)         {             Bitmap originalImage = BitmapFactory.decodeResource(mContext.getResources(), imageId);             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(mContext);             imageView.setImageBitmap(bitmapWithReflection);             imageView.setLayoutParams(new GalleryFlow.LayoutParams(250, 340));             imageView.setScaleType(ScaleType.FIT_XY);             mImages[index++] = imageView;         }         return true;     }     private Resources getResources()      {         // TODO Auto-generated method stub         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)));     }}

 

GalleryFlow.java

package xiaosi.GalleryFlow;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();    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);    }    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();    }}

 

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