本系列文章一共5篇
谁说Android的动画不廉价（一）之项目分层
谁说Android的动画不廉价（二）之转场动画
谁说Android的动画不廉价（三）之共享元素动画
谁说Android的动画不廉价（四）之元素动画
谁说Android的动画不廉价（五）之水波纹动画
GitHub源码

引言

本篇博文是基于上一篇博文谁说Android的动画不廉价（三）之共享元素动画的基础上做的拓展。

目标效果图

转场动画

前提说明

其实这篇博文分为两个动画。

• 第一种就是标题上的元素动画。就是View的位置，大小发生改变时伴随着动画效果。
• 另一种就是场景动画，同一些元素，在不同layout里面的位置大小不同，然后通过切换场景来模拟View的位置大小改变。不同的layout元素可以不一样，Android根据id来判断是否为同一个元素。两个layout没有相同元素的旧layout元素将会使用退出动画，然后没有相同元素的新layout元素将会使用进入动画

元素动画

如何开启

改变View的大小，位置之前使用TransitionManager.beginDelayedTransition(ViewGroup sceneRoot, [Transition transition]);开启

• sceneRoot ： 元素所在的ViewGroup
• transition ： 改变时的动画效果

场景动画

如何加载场景

通过Scene.getSceneForLayout(ViewGroup viewGroup,int layoutID,Context context);方法加载一个场景

• viewGroup ： layout需要加入的ViewGroup，类似于Fragment使用中的FrameLayout容器
• layoutID : 场景的布局文件资源id

如何切换

通过TransitionManager.go(Scene scene,[Transition transition]);方法来切换场景

元素动画

布局文件

activity_view_animation.xml

元素动画布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <include layout="@layout/tool_bar" />


    <ImageView
        android:id="@+id/img"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_below="@+id/toolBar"
        android:layout_gravity="center"
        android:layout_marginTop="30dp"
        android:src="@drawable/circle_orange" />


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:orientation="horizontal">


        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:layout_marginRight="20dp"
            android:layout_weight="1"
            android:onClick="changeSize"
            android:text="改变大小" />

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:layout_marginRight="20dp"
            android:layout_weight="1"
            android:onClick="changePosition"
            android:text="改变位置" />
    </LinearLayout>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="20dp"
        android:onClick="next"
        android:text="Next（SCENES）" />
</LinearLayout>

代码

MainActivity.java

 public void viewAnimations(View v) {
        Intent intent = new Intent(this, ViewAnimationActivity.class);
        ActivityOptionsCompat activityOptionsCompat = ActivityOptionsCompat.makeSceneTransitionAnimation(this);
        startActivity(intent, activityOptionsCompat.toBundle());
    }

ViewAnimationActivity.java

package demo.august1996.top.transitionanimationsdemo;

import android.content.Intent;
import android.support.v4.app.ActivityOptionsCompat;
import android.transition.TransitionManager;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;

import demo.august1996.top.transitionanimationsdemo.Activity.ToolbarActivity;

public class ViewAnimationActivity extends ToolbarActivity {

    ViewGroup container;
    View imageView;
    boolean isChangeSize = false;
    boolean isChangePosition = false;

    @Override
    protected String getToolbarTitle() {
        return "元素动画";
    }

    @Override
    protected void initView() {
        imageView = findViewById(R.id.img);
        container = (ViewGroup) findViewById(R.id.container);
    }

    @Override
    protected int getContentViewID() {
        return R.layout.activity_view_animation;
    }

    @Override
    protected boolean canBack() {
        return true;
    }

    /**
     * 修改指定View的大小，根据isChangeSize来判断
     * isChangeSize == true：为修改过的大小，大小*2
     * isChangeSize == false：为原始的大小，大小/2
     * @param v
     */
    public void changeSize(View v) {
        TransitionManager.beginDelayedTransition(container);
        LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) imageView.getLayoutParams();
        if (isChangeSize) {
            layoutParams.width = layoutParams.width * 2;
        } else {
            layoutParams.width = layoutParams.width / 2;
        }
        layoutParams.height = layoutParams.width;
        imageView.setLayoutParams(layoutParams);
        isChangeSize = !isChangeSize;
    }

    /**
     * 与changeSize类似
     * @param v
     */
    public void changePosition(View v) {
        TransitionManager.beginDelayedTransition(container);

        LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) imageView.getLayoutParams();
        if (isChangePosition) {
            layoutParams.gravity = Gravity.CENTER;
        } else {
            layoutParams.gravity = Gravity.LEFT;
        }
        imageView.setLayoutParams(layoutParams);
        imageView.postInvalidate();
        isChangePosition = !isChangePosition;

    }

    public void next(View v) {
        Intent intent = new Intent(this, SceneActivity.class);
        ActivityOptionsCompat activityOptionsCompat = ActivityOptionsCompat.makeSceneTransitionAnimation(this);
        startActivity(intent, activityOptionsCompat.toBundle());
    }
}

改变View的布局参数前开启动画效果TransitionManager.beginDelayedTransition(container);

场景动画

布局文件

比较多，1个Activity的layout加上5个场景的layout
第一个是初始化的场景，其余四个是含有相同的元素，只是位置不同。

activity_scene.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activityRoot"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <include layout="@layout/tool_bar" />


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="vertical">

        <FrameLayout
            android:id="@+id/viewRoot"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"></FrameLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"

            android:orientation="horizontal">

            <Button
                android:id="@+id/one"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginLeft="20dp"
                android:layout_marginRight="20dp"
                android:layout_weight="1"
                android:alpha="0"
                android:onClick="one"
                android:scaleX="0"
                android:scaleY="0"
                android:text="Scene One" />

            <Button
                android:id="@+id/two"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginLeft="20dp"
                android:layout_marginRight="20dp"
                android:layout_weight="1"
                android:alpha="0"
                android:onClick="two"
                android:scaleX="0"
                android:scaleY="0"
                android:text="Scene TWO" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:orientation="horizontal">

            <Button
                android:id="@+id/three"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginLeft="20dp"
                android:layout_marginRight="20dp"
                android:layout_weight="1"
                android:alpha="0"
                android:onClick="three"
                android:scaleX="0"
                android:scaleY="0"
                android:text="Scene Three" />

            <Button
                android:id="@+id/four"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginLeft="20dp"
                android:layout_marginRight="20dp"
                android:layout_weight="1"
                android:alpha="0"
                android:onClick="four"
                android:scaleX="0"
                android:scaleY="0"
                android:text="Scene Four" />
        </LinearLayout>
    </LinearLayout>
</LinearLayout>

• FrameLayout就是我们场景需要加载的地方
• 而且我们看到按钮有放大且透明出现的效果，所以我们先把scaleX、scaleY和alpha设置成0

sences_layout_0.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="Demo"
        android:textColor="#f0f"
        android:textSize="100sp"
        android:textStyle="bold" />


</RelativeLayout>

sences_layout_1.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <ImageView
        android:id="@+id/circle_orange"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentLeft="true"
        android:layout_margin="10dp"
        android:src="@drawable/circle_orange" />


    <ImageView
        android:id="@+id/circle_blue"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentRight="true"
        android:layout_margin="10dp"
        android:src="@drawable/circle_blue" />

    <ImageView
        android:id="@+id/circle_yellow"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/circle_orange"
        android:layout_margin="10dp"
        android:src="@drawable/circle_yellow" />

    <ImageView
        android:id="@+id/circle_red"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentRight="true"
        android:layout_below="@id/circle_orange"
        android:layout_margin="10dp"
        android:src="@drawable/circle_red" />
</RelativeLayout>

sences_layout_2.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <ImageView
        android:id="@+id/circle_blue"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentLeft="true"
        android:layout_margin="10dp"
        android:src="@drawable/circle_blue" />


    <ImageView
        android:id="@+id/circle_yellow"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentRight="true"
        android:layout_margin="10dp"
        android:src="@drawable/circle_yellow" />

    <ImageView
        android:id="@+id/circle_red"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentLeft="true"
        android:layout_below="@id/circle_blue"
        android:layout_margin="10dp"
        android:src="@drawable/circle_red" />

    <ImageView
        android:id="@+id/circle_orange"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentRight="true"
        android:layout_below="@id/circle_blue"
        android:layout_margin="10dp"
        android:src="@drawable/circle_orange" />


</RelativeLayout>

sences_layout_3.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <ImageView
        android:id="@+id/circle_red"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentLeft="true"
        android:layout_margin="10dp"
        android:src="@drawable/circle_red" />

    <ImageView
        android:id="@+id/circle_orange"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentRight="true"
        android:layout_margin="10dp"
        android:src="@drawable/circle_orange" />


    <ImageView
        android:id="@+id/circle_blue"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/circle_red"
        android:layout_margin="10dp"
        android:src="@drawable/circle_blue" />

    <ImageView
        android:id="@+id/circle_yellow"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/circle_red"
        android:layout_margin="10dp"
        android:src="@drawable/circle_yellow" />

</RelativeLayout>

sences_layout_4.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <ImageView
        android:id="@+id/circle_blue"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentRight="true"
        android:layout_below="@id/circle_yellow"
        android:layout_margin="10dp"
        android:src="@drawable/circle_blue" />


    <ImageView
        android:id="@+id/circle_yellow"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentLeft="true"
        android:layout_margin="10dp"
        android:src="@drawable/circle_yellow" />

    <ImageView
        android:id="@+id/circle_red"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentRight="true"
        android:layout_margin="10dp"
        android:src="@drawable/circle_red" />

    <ImageView
        android:id="@+id/circle_orange"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_alignParentLeft="true"
        android:layout_below="@id/circle_yellow"
        android:layout_margin="10dp"
        android:src="@drawable/circle_orange" />


</RelativeLayout>

代码

SceneActivity.java

package demo.august1996.top.transitionanimationsdemo;

import android.transition.ChangeBounds;
import android.transition.Scene;
import android.transition.Slide;
import android.transition.TransitionManager;
import android.transition.TransitionSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.BounceInterpolator;

import java.util.ArrayList;
import java.util.List;

import demo.august1996.top.transitionanimationsdemo.Activity.ToolbarActivity;

public class SceneActivity extends ToolbarActivity {


    /**
     * 用于动画效果的按钮
     */
    List<View> buttonList = new ArrayList<>();

    /**
     * 添加场景到该ViewGroup
     */
    ViewGroup viewRoot;

    /**
     * 一共5个场景，0为默认场景
     */
    Scene scene0;
    Scene scene1;
    Scene scene2;
    Scene scene3;
    Scene scene4;

    @Override
    protected void beforeInitView() {
        super.beforeInitView();
    }

    @Override
    protected String getToolbarTitle() {
        return "场景动画";
    }

    @Override
    protected void initView() {
        /**
         * 初始化按钮View
         */
        buttonList.add(findViewById(R.id.one));
        buttonList.add(findViewById(R.id.two));
        buttonList.add(findViewById(R.id.three));
        buttonList.add(findViewById(R.id.four));
        viewRoot = (ViewGroup) findViewById(R.id.viewRoot);

        /**
         * 初始化场景
         */
        scene0 = Scene.getSceneForLayout(viewRoot, R.layout.sences_layout_0, this);
        scene1 = Scene.getSceneForLayout(viewRoot, R.layout.sences_layout_1, this);
        scene2 = Scene.getSceneForLayout(viewRoot, R.layout.sences_layout_2, this);
        scene3 = Scene.getSceneForLayout(viewRoot, R.layout.sences_layout_3, this);
        scene4 = Scene.getSceneForLayout(viewRoot, R.layout.sences_layout_4, this);

        /**
         * 当场景1被切换的时候，按钮显示动画
         */
        scene0.setEnterAction(new Runnable() {
            @Override
            public void run() {
                for (int i = 0; i < buttonList.size(); i++) {
                    View view = buttonList.get(i);
                    view.animate()
                            .setDuration(1000)
                            .scaleX(1)
                            .scaleY(1)
                            .alpha(1)
                            .start();
                }
            }
        });

        /**
         * 切换到场景0
         */
        TransitionManager.go(scene0);
    }

    /**
     * 使用简单动画切换场景1
     * @param v
     */
    public void one(View v) {
        TransitionManager.go(scene1, new ChangeBounds());
    }

    /**
     * 使用混合动画加载场景2
     * @param v
     */
    public void two(View v) {
        TransitionSet transitionSet = new TransitionSet();
        transitionSet.setDuration(1000);
        Slide slide = new Slide();
        ChangeBounds changeBounds = new ChangeBounds();
        transitionSet.addTransition(slide);
        transitionSet.addTransition(changeBounds);
        TransitionManager.go(scene2, transitionSet);
    }

    /**
     * 使用混合动画加载场景3，并设置动画顺序
     * @param v
     */
    public void three(View v) {
        TransitionSet transitionSet = new TransitionSet();
        transitionSet.setDuration(1000);
        Slide slide = new Slide();
        ChangeBounds changeBounds = new ChangeBounds();
        transitionSet.addTransition(slide);
        transitionSet.addTransition(changeBounds);
        transitionSet.setOrdering(TransitionSet.ORDERING_SEQUENTIAL);
        TransitionManager.go(scene3, transitionSet);
    }

    /**
     * 使用混合动画加载场景4，并设置动画顺序和差时器
     * @param v
     */
    public void four(View v) {
        TransitionSet transitionSet = new TransitionSet();
        transitionSet.setDuration(1000);
        transitionSet.setInterpolator(new BounceInterpolator());
        Slide slide = new Slide();
        ChangeBounds changeBounds = new ChangeBounds();
        transitionSet.addTransition(slide);
        transitionSet.addTransition(changeBounds);
        transitionSet.setOrdering(TransitionSet.ORDERING_SEQUENTIAL);
        TransitionManager.go(scene4, transitionSet);
    }

    @Override
    protected int getContentViewID() {
        return R.layout.activity_scene;
    }

    @Override
    protected boolean canBack() {
        return true;
    }
}

我们的效果图

我们的效果图