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  • Android Gallery3D效果 教程 案例 代码

      Android Gallery3D效果 代码
      效果图:

      贴上代码:

    1.扩展Gallery:
      public class GalleryFlow 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 GalleryFlow(Context context) {
      super(context);
      //支持转换 ,执行getChildStaticTransformation方法
      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) {
      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)
      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();
      }
      }
    

      2.填充图片容器(BaseAdapter):

    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 GalleryFlow.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)));
      }
      }
    

      3.创建Activity:

     public class Gallery3DActivity extends Activity {
      public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.layout_gallery);
      Integer[] images = { R.drawable.img0001, R.drawable.img0030,
      R.drawable.img0100, R.drawable.img0130, R.drawable.img0200,
      R.drawable.img0230,  R.drawable.img0330,R.drawable.img0354 };
      ImageAdapter adapter = new ImageAdapter(this, images);
      adapter.createReflectedImages();//创建倒影效果
      GalleryFlow galleryFlow = (GalleryFlow) 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);
      }
      }
    
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  • 原文地址:https://www.cnblogs.com/vus520/p/2561869.html
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