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云代码 - android代码库

3D相册（Gallery 3D + 倒影效果） GalleryFlow

2012-10-14 作者： 小蜜锋举报

[android]代码库


GalleryFlowActivity.java
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package com.image.galleryFlow;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
 
public class GalleryFlowActivity extends Activity {
    private GalleryFlow galleryFlow;
    private ImageAdapter adapter;
    private GestureDetector detector;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout_gallery);
 
        detector = new GestureDetector(new MyGestureListener());
        int[] images = { R.drawable.p01, R.drawable.p02, R.drawable.p03,
                R.drawable.p04, R.drawable.p05 };
        adapter = new ImageAdapter(this, images);
        adapter.createReflectedImages();
 
        galleryFlow = (GalleryFlow) findViewById(R.id.gallery_flow);
        galleryFlow.setAdapter(adapter);
        galleryFlow.setSelection(1);
    }
 
    private class MyGestureListener extends SimpleOnGestureListener {
 
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                float velocityY) {
            // TODO Auto-generated method stub
            int currentPosition = galleryFlow.getSelectedItemPosition();
            if (e1.getX() - e2.getX() > 50 && Math.abs(velocityX) > 100) {
                if (currentPosition + 1 == adapter.getCount()) {
                    galleryFlow.setSelection(0);
                } else {
                    galleryFlow.setSelection(currentPosition + 1);
                }
            } else if (e2.getX() - e1.getX() > 50 && Math.abs(velocityX) > 100) {
                if (currentPosition - 1 < 0) {
                    galleryFlow.setSelection(adapter.getCount() - 1);
                } else {
                    galleryFlow.setSelection(currentPosition - 1);
                }
            }
            return super.onFling(e1, e2, velocityX, velocityY);
        }
 
    }
 
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        return detector.onTouchEvent(event);
    }
}

GalleryFlow.java
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package com.image.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;// 最大旋转角度
    private int mMaxZoom = -430;// 最大缩放值
    private int mCoverflowCenter;
 
    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;
    }
 
    @Override
    protected boolean getChildStaticTransformation(View child, Transformation t) {
        // TODO Auto-generated method stub
        final int childCenter = getCenterOfView(child);
        final int childWidth = child.getWidth();
        int rotationAngle = 0;
        t.clear();
        t.setTransformationType(Transformation.TYPE_MATRIX);
        if (childCenter == mCoverflowCenter) {
            transformImageBitmap((ImageView) child, t, 0);
        } else {
            rotationAngle = (int) (((float) (mCoverflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
            if (Math.abs(rotationAngle) > mMaxRotationAngle) {
                rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle
                        : mMaxRotationAngle;
            }
            transformImageBitmap((ImageView) child, t, rotationAngle);
        }
        return true;
    }
 
    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);
        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);
        }
        mCamera.rotateY(rotationAngle);
        mCamera.getMatrix(imageMatrix);
        imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));
        imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));
        mCamera.restore();
    }
 
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        mCoverflowCenter = getCenterOfCoverflow();
        super.onSizeChanged(w, h, oldw, oldh);
    }
 
}

ImageAdapter.java
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package com.image.galleryFlow;
 
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.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 int[] mImageIds;
    private ImageView[] mImages;
 
    public ImageAdapter(Context c, int[] ImageIds) {
        mContext = c;
        mImageIds = ImageIds;
        mImages = new ImageView[mImageIds.length];
    }
 
    public void createReflectedImages() {
        // TODO Auto-generated method stub
        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 defaultPaint = new Paint();
            canvas.drawRect(0, height, width, height + reflectionGap,
                    defaultPaint);
            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(160, 240));
            mImages[index++] = imageView;
        }
 
    }
 
    public int getCount() {
        // TODO Auto-generated method stub
        return mImageIds.length;
    }
 
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }
 
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }
 
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        return mImages[position];
    }
 
    public float getScale(boolean focused, int offset) {
        return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));
    }
}


layout_gallery.xml
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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ffffff"
    android:orientation="vertical" >
 
    <com.image.galleryFlow.GalleryFlow
        android:id="@+id/gallery_flow"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_centerInParent="true"
        android:spacing="1dp"
        android:text="@string/hello" />
 
</RelativeLayout>





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