自定义控件：3D画廊Gallery

Gallery

This class was deprecated in API level 16.
This widget is no longer supported. Other horizontally scrolling widgets include HorizontalScrollView and ViewPager from the support library.

package com.github.gallery.view; 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 CustomGallery extends Gallery { private int galleryCenterPoint = 0; // gallery的中心点 private Camera camera; public CustomGallery(Context context, AttributeSet attrs) { super(context, attrs); // 启用getChildStaticTransformation被调用 setStaticTransformationsEnabled(true); camera = new Camera(); } /** * 当gallery控件的宽和高改变时回调此方法, 第一次计算出gallery的宽和高时, 也会出发此方法 */ @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); galleryCenterPoint = getGalleryCenterPoint(); } /** * 返回gallery的item的子图形变换效果 * Transformation 指定当前item的变换效果 */ @Override protected boolean getChildStaticTransformation(View child, Transformation t) { int viewCenterPoint = getviewCenterPoint(child); // item的中心点 int rotateAngle = 0; // 默认旋转角度为0 // 如果当前的View的中心点不等于gallery的中心点, 就是两边的图片, 需要计算旋转角度 if(viewCenterPoint != galleryCenterPoint) { // gallery中心点 - 图片中心点 = 差值 int diff = galleryCenterPoint - viewCenterPoint; // 差值 / 图片的宽度 = 比值 float scale = (float)diff / (float)child.getWidth(); // 比值 * 最大旋转角度 = 最终的旋转角度 rotateAngle = (int) (scale * 50); if(Math.abs(rotateAngle) > 50) { // 当前角度超过了50, 需要赋值到50 或者 -50 rotateAngle = rotateAngle > 0 ?