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本文出自：猴菇先生的博客

Android过渡动画是在api21加入的作用在window的动画，效果如下

1.在style的theme中加上

<item name="android:windowContentTransitions">trueitem><item name="android:windowAllowEnterTransitionOverlap">falseitem><item name="android:windowAllowReturnTransitionOverlap">falseitem>

2.MainActivity.java:

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        setWindowAnimation();        findViewById(R.id.next_btn).setOnClickListener(new View.OnClickListener() {            @SuppressWarnings("unchecked")            @Override            public void onClick(View v) {                Intent intent = new Intent(MainActivity.this, NextActivity.class);                //这两个Pair是设置共享元素，transitionName需要和下一个界面中需要共享的控件设置相同的                ActivityOptionsCompat activityOptionsCompat = ActivityOptionsCompat.makeSceneTransitionAnimation                        (MainActivity.this, new Pair<>(findViewById(R.id.circle_iv), getString(R.string.share_circle))                                , new Pair<>(findViewById(R.id.hello_tv), getString(R.string.share_text)));                startActivity(intent, activityOptionsCompat.toBundle());            }        });    }    private void setWindowAnimation() {        Slide slide = new Slide();//滑动动画        slide.setSlideEdge(Gravity.LEFT);//设置滑出方向        slide.setDuration(500);        getWindow().setReenterTransition(slide);//重新进入        getWindow().setExitTransition(slide);//离开    }}

3.NextActivity.java:

public class NextActivity extends AppCompatActivity {    private static final int DELAY = 100;    private static final int MODE_IN = 0x1;    private static final int MODE_OUT = 0x2;    private List btnList = new ArrayList<>();    private LinearLayout mCircularRevealView;//用于展示圆形揭示层的布局    @Override    protected void onCreate(final Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_next);        initView();        setWindowAnimation();        findViewById(R.id.back_btn).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                finishAfterTransition();//在过渡动画结束后finish            }        });    }    private void setWindowAnimation() {//        Fade fade = new Fade();//渐变动画//        fade.setDuration(500);//        getWindow().setEnterTransition(fade);        Explode explode = new Explode();//分解动画        explode.setDuration(500);        getWindow().setEnterTransition(explode);//进入        Slide slide = new Slide(Gravity.RIGHT);//滑动动画        slide.setDuration(500);        getWindow().setReturnTransition(slide);//返回        TransitionSet transitionSet = new TransitionSet();//过渡动画集合        ChangeBounds tvTran = new ChangeBounds();//共享元素动画        tvTran.setDuration(500);        tvTran.addTarget(findViewById(R.id.hello_tv));        //在xml中inflate动画        Transition circleTran = TransitionInflater.from(this).inflateTransition(R.transition.changebounds_with_arcmotion);        circleTran.addTarget(findViewById(R.id.circle_iv));        transitionSet.addTransition(tvTran).addTransition(circleTran);        //给window设置共享元素动画        getWindow().setSharedElementEnterTransition(transitionSet);        //进入监听        getWindow().getEnterTransition().addListener(new Transition.TransitionListener() {            @Override            public void onTransitionStart(Transition transition) {                //创建圆形揭示层动画                createCircularRevealAnim(MODE_IN);                mCircularRevealView.setBackgroundResource(R.color.base_white);            }            @Override            public void onTransitionEnd(Transition transition) {                //创建按钮缩放动画                for (int i = 0; i < btnList.size(); i++) {                    Button btn = btnList.get(i);                    //ViewPropertyAnimator，属性动画的简便写法                    btn.animate().setStartDelay(i * DELAY).setDuration(500).scaleX(1).scaleY(1);                }            }            @Override            public void onTransitionCancel(Transition transition) {            }            @Override            public void onTransitionPause(Transition transition) {            }            @Override            public void onTransitionResume(Transition transition) {            }        });        //返回监听        getWindow().getReturnTransition().addListener(new Transition.TransitionListener() {            @Override            public void onTransitionStart(Transition transition) {                //创建圆形揭示层动画                createCircularRevealAnim(MODE_OUT);            }            @Override            public void onTransitionEnd(Transition transition) {            }            @Override            public void onTransitionCancel(Transition transition) {            }            @Override            public void onTransitionPause(Transition transition) {            }            @Override            public void onTransitionResume(Transition transition) {            }        });    }    /**     * 创建圆形揭示层动画     */    private void createCircularRevealAnim(int mode) {        //设置圆心坐标和半径        int mCx = (mCircularRevealView.getLeft() + mCircularRevealView.getRight()) / 2;        int mCy = (mCircularRevealView.getTop() + mCircularRevealView.getBottom()) / 2;        int mRadius = Math.max(mCircularRevealView.getWidth() / 2, mCircularRevealView.getHeight() / 2);        Animator anim;        if (mode == MODE_IN) {            anim = ViewAnimationUtils.createCircularReveal(mCircularRevealView, mCx, mCy, 0, mRadius);        } else {            anim = ViewAnimationUtils.createCircularReveal(mCircularRevealView, mCx, mCy, mRadius, 0);        }        anim.setDuration(500);        anim.start();    }    private void initView() {        mCircularRevealView = (LinearLayout) findViewById(R.id.circular_reveal_view);        Button btn1 = (Button) findViewById(R.id.btn1);        Button btn2 = (Button) findViewById(R.id.btn2);        Button btn3 = (Button) findViewById(R.id.btn3);        Button btn4 = (Button) findViewById(R.id.btn4);        btnList.add(btn1);        btnList.add(btn2);        btnList.add(btn3);        btnList.add(btn4);    }}

4.changebounds_with_arcmotion.xml

<?xml version="1.0" encoding="utf-8"?><transitionSet xmlns:android="http://schemas.android.com/apk/res/android"    android:duration="500"    android:interpolator="@android:interpolator/accelerate_decelerate">    <changeBounds />        <arcMotion        android:maximumAngle="90"        android:minimumHorizontalAngle="90"        android:minimumVerticalAngle="0" />transitionSet>

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