应用源码之GalleryDemo.zip

package nsouth.jonas.android; 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();//相机类 private int mMaxRotationAngle = 60;//最大转动角度 private int mMaxZoom = -280;////最大缩放值 private int mCoveflowCenter;//半径值 /** * * @param context */ 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); } /** * 获取旋转最大角度 * @return */ public int getMaxRotationAngle() { return mMaxRotationAngle; } /** * 设置旋转最大角度 * @param maxRotationAngle */ public void setMaxRotationAngle(int maxRotationAngle) { mMaxRotationAngle = maxRotationAngle; } /** * 获取最大缩放值 * @return */ public int getMaxZoom() { return mMaxZoom; } /** * 设置最大缩放值 * @param maxZoom */ public void setMaxZoom(int maxZoom) { mMaxZoom = maxZoom; } /** * 获取半径值 * @return */ private int getCenterOfCoverflow() { return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2 + getPaddingLeft(); } /** * * @param view * @return */ 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); 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(); } }