2001-Views-Animation-3D-Transition

介绍一个3D动画的旋转动画

package com.example.android.apis.animation;import com.example.android.apis.R;import android.app.Activity;import android.os.Bundle;import android.widget.ListView;import android.widget.ArrayAdapter;import android.widget.AdapterView;import android.widget.ImageView;import android.view.View;import android.view.ViewGroup;import android.view.animation.Animation;import android.view.animation.AccelerateInterpolator;import android.view.animation.DecelerateInterpolator;/** * This sample application shows how to use layout animation and various * transformations on views. The result is a 3D transition between a * ListView and an ImageView. When the user clicks the list, it flips to * show the picture. When the user clicks the picture, it flips to show the * list. The animation is made of two smaller animations: the first half * rotates the list by 90 degrees on the Y axis and the second half rotates * the picture by 90 degrees on the Y axis. When the first half finishes, the * list is made invisible and the picture is set visible. */public class Transition3d extends Activity implements        AdapterView.OnItemClickListener, View.OnClickListener {    private ListView mPhotosList;    private ViewGroup mContainer;    private ImageView mImageView;    // Names of the photos we show in the list    private static final String[] PHOTOS_NAMES = new String[] {            "Lyon",            "Livermore",            "Tahoe Pier",            "Lake Tahoe",            "Grand Canyon",            "Bodie",            "Lyon",            "Livermore",            "Tahoe Pier",            "Lake Tahoe",            "Grand Canyon",            "Bodie"    };    // Resource identifiers for the photos we want to display    private static final int[] PHOTOS_RESOURCES = new int[] {            R.drawable.photo1,            R.drawable.photo2,            R.drawable.photo3,            R.drawable.photo4,            R.drawable.photo5,            R.drawable.photo6,            R.drawable.photo1,            R.drawable.photo2,            R.drawable.photo3,            R.drawable.photo4,            R.drawable.photo5,            R.drawable.photo6    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.animations_main_screen);        mPhotosList = (ListView) findViewById(android.R.id.list);        mImageView = (ImageView) findViewById(R.id.picture);        mContainer = (ViewGroup) findViewById(R.id.container);        // Prepare the ListView        final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,                android.R.layout.simple_list_item_1, PHOTOS_NAMES);        mPhotosList.setAdapter(adapter);        mPhotosList.setOnItemClickListener(this);        // Prepare the ImageView        mImageView.setClickable(true);        mImageView.setFocusable(true);        mImageView.setOnClickListener(this);        // Since we are caching large views, we want to keep their cache        // between each animation        mContainer.setPersistentDrawingCache(ViewGroup.PERSISTENT_ANIMATION_CACHE);    }    /**     * Setup a new 3D rotation on the container view.     *     * @param position the item that was clicked to show a picture, or -1 to show the list     * @param start the start angle at which the rotation must begin     * @param end the end angle of the rotation     */    private void applyRotation(int position, float start, float end) {        // Find the center of the container        final float centerX = mContainer.getWidth() / 2.0f;        final float centerY = mContainer.getHeight() / 2.0f;        // Create a new 3D rotation with the supplied parameter        // The animation listener is used to trigger the next animation        final Rotate3dAnimation rotation =                new Rotate3dAnimation(start, end, centerX, centerY, 310.0f, true);        rotation.setDuration(500);        rotation.setFillAfter(true);        //AccelerateInterpolator：动画从开始到结束，变化率是一个加速的过程。        //DecelerateInterpolator：动画从开始到结束，变化率是一个减速的过程。        //CycleInterpolator：动画从开始到结束，变化率是循环给定次数的正弦曲线。        //AccelerateDecelerateInterpolator：动画从开始到结束，变化率是先加速后减速的过程。        rotation.setInterpolator(new AccelerateInterpolator());        rotation.setAnimationListener(new DisplayNextView(position));        mContainer.startAnimation(rotation);    }    public void onItemClick(AdapterView parent, View v, int position, long id) {        // Pre-load the image then start the animation        mImageView.setImageResource(PHOTOS_RESOURCES[position]);        applyRotation(position, 0, 90);    }    public void onClick(View v) {        applyRotation(-1, 180, 90);    }    /**     * This class listens for the end of the first half of the animation.     * It then posts a new action that effectively swaps the views when the container     * is rotated 90 degrees and thus invisible.     */    private final class DisplayNextView implements Animation.AnimationListener {        private final int mPosition;        private DisplayNextView(int position) {            mPosition = position;        }        public void onAnimationStart(Animation animation) {        }        public void onAnimationEnd(Animation animation) {            mContainer.post(new SwapViews(mPosition));        }        public void onAnimationRepeat(Animation animation) {        }    }    /**     * This class is responsible for swapping the views and start the second     * half of the animation.     */    private final class SwapViews implements Runnable {        private final int mPosition;        public SwapViews(int position) {            mPosition = position;        }        public void run() {            final float centerX = mContainer.getWidth() / 2.0f;            final float centerY = mContainer.getHeight() / 2.0f;            Rotate3dAnimation rotation;                        if (mPosition > -1) {                mPhotosList.setVisibility(View.GONE);                mImageView.setVisibility(View.VISIBLE);                mImageView.requestFocus();                rotation = new Rotate3dAnimation(90, 180, centerX, centerY, 310.0f, false);            } else {                mImageView.setVisibility(View.GONE);                mPhotosList.setVisibility(View.VISIBLE);                mPhotosList.requestFocus();                rotation = new Rotate3dAnimation(90, 0, centerX, centerY, 310.0f, false);            }            rotation.setDuration(500);            rotation.setFillAfter(true);            rotation.setInterpolator(new DecelerateInterpolator());            mContainer.startAnimation(rotation);        }    }}

Rotate3dAnimation.java

/* * 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 performed around a center point on the 2D space, definied by a pair     * of X and Y coordinates, called centerX and centerY. When the animation     * starts, a translation on the Z axis (depth) is performed. The length     * of the translation can be specified, as well as whether the translation     * should be reversed in time.     *     * @param fromDegrees the start angle of the 3D rotation     * @param toDegrees the end angle of the 3D rotation     * @param centerX the X center of the 3D rotation     * @param centerY the Y center of the 3D rotation     * @param reverse true if the translation should be reversed, false otherwise     */    public Rotate3dAnimation(float fromDegrees, float toDegrees,            float centerX, float centerY, float depthZ, boolean reverse) {        mFromDegrees = fromDegrees;        mToDegrees = toDegrees;        mCenterX = centerX;        mCenterY = centerY;        mDepthZ = depthZ;        mReverse = reverse;    }    @Override    public void initialize(int width, int height, int parentWidth, int parentHeight) {        super.initialize(width, height, parentWidth, parentHeight);        mCamera = new Camera();    }    @Override    protected void applyTransformation(float interpolatedTime, Transformation t) {        final float fromDegrees = mFromDegrees;        float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);        final float centerX = mCenterX;        final float centerY = mCenterY;        final Camera camera = mCamera;        final Matrix matrix = t.getMatrix();        camera.save();        if (mReverse) {            camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime);        } else {            camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime));        }        camera.rotateY(degrees);        camera.getMatrix(matrix);        camera.restore();        matrix.preTranslate(-centerX, -centerY);        matrix.postTranslate(centerX, centerY);    }}