浅谈Android实现3D旋转_android 3d 旋转-优快云博客

本文链接：https://blog.youkuaiyun.com/houliang120/article/details/51746862

本文探讨如何在Android中实现View和Bitmap的3D旋转效果。通过自定义Animation实现View的3D旋转，详细解析相关代码，并指出Android动画本质上是矩阵变换。另外，文章还介绍了不依赖系统Animation框架，手动计算并驱动每一帧3D旋转的方法，涉及Matrix的使用以及ImageView的设置。最后提供源码下载链接。

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本文主要记录有关View以及Bitmap的3D旋转效果的实现方法与相关思考。

1 使用Animation实现View的3D旋转

采用继承Animation的方法实现View的3D旋转效果，在ApiDemos里面有详细的代码，具体路径为src/com/example/android/apis/animation/Rotate3dAnimation.java

贴一下代码，记录一下：

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.animation;

import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.graphics.Camera;
import android.graphics.Matrix;

/**
 * An animation that rotates the view on the Y axis between two specified angles.
 * This animation also adds a translation on the Z axis (depth) to improve the effect.
 */
public class Rotate3dAnimation extends Animation {
    private final float mFromDegrees;
    private final float mToDegrees;
    private final float mCenterX;
    private final float mCenterY;
    private final float mDepthZ;
    private final boolean mReverse;
    private Camera mCamera;

    /**
     * Creates a new 3D rotation on the Y axis. The rotation is defined by its
     * start angle and its end angle. Both angles are in degrees. The rotation
     * is per