网上发现的3D Gallery效果

看了看效果，跑了一下。感觉还不错。

 

作者不知道是谁了，收藏一下：

 

Gallery3DActivity

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;

import com.zgy.android.view.MyGalleryView;

public class Gallery3DActivity extends Activity {
	
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.layout_gallery);

		Integer[] images = { R.drawable.sample_5, R.drawable.sample_7,
				R.drawable.sample_5, R.drawable.sample_7, R.drawable.sample_5,
				R.drawable.sample_7, R.drawable.sample_5, R.drawable.sample_7 };

		ImageAdapter adapter = new ImageAdapter(this, images);
		adapter.createReflectedImages();// 创建倒影效果
		MyGalleryView galleryFlow = (MyGalleryView) this.findViewById(R.id.Gallery01);
		galleryFlow.setFadingEdgeLength(0);
		galleryFlow.setSpacing(-100); // 图片之间的间距
		galleryFlow.setAdapter(adapter);

		galleryFlow.setOnItemClickListener(new OnItemClickListener() {
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				Toast.makeText(getApplicationContext(),
						String.valueOf(position), Toast.LENGTH_SHORT).show();
			}

		});
		galleryFlow.setSelection(4);
	}
}

 

 

ImageAdapter.java

 

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;

import com.zgy.android.view.MyGalleryView;

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];
	}

	/**
	 * 创建倒影效果
	 * 
	 * @return
	 */
	public boolean createReflectedImages() {
		// 倒影图和原图之间的距离
		final int reflectionGap = 4;
		int index = 0;
		for (int imageId : mImageIds) {
			// 返回原图解码之后的bitmap对象
			Bitmap originalImage = BitmapFactory.decodeResource(mContext.getResources(), imageId);
			int width = originalImage.getWidth();
			int height = originalImage.getHeight();
			// 创建矩阵对象
			Matrix matrix = new Matrix();
			// 指定一个角度以0,0为坐标进行旋转
			// matrix.setRotate(30);
			// 指定矩阵(x轴不变，y轴相反)
			matrix.preScale(1, -1);
			// 将矩阵应用到该原图之中，返回一个宽度不变，高度为原图1/2的倒影位图
			Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, height / 2, width, height / 2, matrix, false);
			// 创建一个宽度不变，高度为原图+倒影图高度的位图
			Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888);

			// 将上面创建的位图初始化到画布
			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);
			/**
			 * 参数一:为渐变起初点坐标x位置， 参数二:为y轴位置， 参数三和四:分辨对应渐变终点， 最后参数为平铺方式，
			 * 这里设置为镜像Gradient是基于Shader类，所以我们通过Paint的setShader方法来设置这个渐变
			 */
			LinearGradient shader = new LinearGradient(0, originalImage.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.MIRROR);
			// 设置阴影
			paint.setShader(shader);
			paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.DST_IN));
			// 用已经定义好的画笔构建一个矩形阴影渐变效果
			canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()+ reflectionGap, paint);

			// 创建一个ImageView用来显示已经画好的bitmapWithReflection
			ImageView imageView = new ImageView(mContext);
			imageView.setImageBitmap(bitmapWithReflection);
			// 设置imageView大小 ，也就是最终显示的图片大小
			imageView.setLayoutParams(new MyGalleryView.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)));
	}
}

 这个类里的倒影效果挺有意思的。

 

MyGalleryView.java

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 MyGalleryView extends Gallery {
	private Camera mCamera = new Camera();// 相机类
	private int mMaxRotationAngle = 60;// 最大转动角度
	private int mMaxZoom = -300;// //最大缩放值
	private int mCoveflowCenter;// 半径值

	public MyGalleryView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		this.setStaticTransformationsEnabled(true);
	}

	public MyGalleryView(Context context, AttributeSet attrs) {
		super(context, attrs);
		this.setStaticTransformationsEnabled(true);
	}

	public MyGalleryView(Context context) {
		super(context);
		this.setStaticTransformationsEnabled(true);
	}

	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
		super.onLayout(changed, l, t, r, b);
	}

	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中每个图片的旋转(重写的gallery中方法)
	@Override
	protected boolean getChildStaticTransformation(View child, Transformation t) {
		// 取得当前子view的半径值
		final int childCenter = getCenterOfView(child);
		System.out.println("childCenter：" + childCenter);
		final int childWidth = child.getWidth();
		// 旋转角度
		int rotationAngle = 0;
		// 重置转换状态
		t.clear();
		// 设置转换类型
		t.setTransformationType(Transformation.TYPE_MATRIX);
		// 如果图片位于中心位置不需要进行旋转
		if (childCenter == mCoveflowCenter) {
			transformImageBitmap((ImageView) child, t, 0);
		} else {
			// 根据图片在gallery中的位置来计算图片的旋转角度
			rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
			System.out.println("rotationAngle:" + rotationAngle);
			// 如果旋转角度绝对值大于最大旋转角度返回（-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) {
		// 对效果进行保存
		mCamera.save();
		final Matrix imageMatrix = t.getMatrix();
		// 图片高度
		final int imageHeight = child.getLayoutParams().height;
		// 图片宽度
		final int imageWidth = child.getLayoutParams().width;

		// 返回旋转角度的绝对值
		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();
	}
}

 这个类主要控制图片角度移动。