Android中3D gallary的实现
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Gallery3DActivity:
- package com.test3dgallary;
- import android.app.Activity;
- import android.os.Bundle;
- import android.view.View;
- import android.widget.AdapterView;
- import android.widget.AdapterView.OnItemClickListener;
- import android.widget.ImageView;
- public class Gallery3DActivity extends Activity {
- private ImageView imageView;
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- imageView = (ImageView) findViewById(R.id.main_iv_show);
- Integer[] images = { R.drawable.test1, R.drawable.test2,
- R.drawable.test3, R.drawable.test4, R.drawable.test1,
- R.drawable.test2, R.drawable.test3, R.drawable.test4 };
- ImageAdapter adapter = new ImageAdapter(this, images);
- adapter.createReflectedImages();// 创建倒影效果
- GallaryFor3D gallery = (GallaryFor3D) findViewById(R.id.main_gallery);
- gallery.setFadingEdgeLength(0);
- gallery.setSpacing(-10); // 图片之间的间距
- gallery.setAdapter(adapter);
- gallery.setSelection(4);
- gallery.setOnItemClickListener(new OnItemClickListener() {
- public void onItemClick(AdapterView<?> parent, View view,
- int position, long id) {
- imageView.setImageDrawable(((ImageView) view).getDrawable());
- }
- });
- }
- }
GallaryFor3D:
- package com.test3dgallary;
- 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 GallaryFor3D 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 GallaryFor3D(Context context) {
- super(context);
- // 支持转换 ,执行getChildStaticTransformation方法
- this.setStaticTransformationsEnabled(true);
- }
- public GallaryFor3D(Context context, AttributeSet attrs) {
- super(context, attrs);
- this.setStaticTransformationsEnabled(true);
- }
- public GallaryFor3D(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;
- }
- // 控制gallery中每个图片的旋转(重写的gallery中方法)
- protected boolean getChildStaticTransformation(View child, Transformation t) {
- // 取得当前子view的半径值
- final int childCenter = getCenterOfView(child);
- 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);
- // 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();
- }
- }
ImageAdapter:
- package com.test3dgallary;
- import android.content.Context;
- import android.content.res.Resources;
- 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.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 Integer[] mImageIds;
- private ImageView[] mImages;
- public ImageAdapter(Context context, Integer[] ImageIds) {
- mContext = context;
- 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 GallaryFor3D.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)));
- }
- }
main.xml:
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:orientation="vertical" >
- <com.test3dgallary.GallaryFor3D
- android:id="@+id/main_gallery"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:background="#000"
- android:spacing="20dp" />
- <ImageView
- android:id="@+id/main_iv_show"
- android:layout_width="match_parent"
- android:layout_height="match_parent" />
- </LinearLayout>
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