Android Transition Framwork 主要用来做三件事：
- Activity间的转场动画；
- 不同Activity或Fragment间元素共享，让交互更连贯；
- 同一个Activity之间一些View的变换动画。
1.Activity转场效果
而你需要做的，首先对Activity的ThemeStyle添加windowContentTransitions属性：
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
...
<!-- 允许使用transitions -->
<item name="android:windowContentTransitions">true</item>
<!--是否覆盖执行，其实可以理解成是否同步执行还是顺序执行-->
<item name="android:windowAllowEnterTransitionOverlap">false</item>
<item name="android:windowAllowReturnTransitionOverlap">false</item>
</style>
MainActivity.java(部分关键代码)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Slide slide = new Slide();
slide.setDuration(1000);
getWindow().setExitTransition(slide);
}
switch (view.getId()) {
case R.id.tv_explode_transition:
mIntent.setClass(this, TransitionActivity.class);
mIntent.putExtra("transition", "explode");
startActivity(mIntent, ActivityOptions.makeSceneTransitionAnimation(this).toBundle());
break;
case R.id.tv_slide_transition:
mIntent.setClass(this, TransitionActivity.class);
mIntent.putExtra("transition", "slide");
startActivity(mIntent, ActivityOptions.makeSceneTransitionAnimation(this).toBundle());
break;
case R.id.tv_fade_transition:
mIntent.setClass(this, TransitionActivity.class);
mIntent.putExtra("transition", "fade");
startActivity(mIntent, ActivityOptions.makeSceneTransitionAnimation(this).toBundle());
break;
}
用startActivity(mIntent, ActivityOptions.makeSceneTransitionAnimation(this).toBundle());来替换之前的startActivity();
TransitionActivity.java(部分关键代码)
switch (transition) {
case "explode":
imageView.setBackgroundResource(R.drawable.circle_red);
Explode explode = new Explode();
explode.setDuration(1000L);
getWindow().setEnterTransition(explode);
break;
case "slide":
imageView.setBackgroundResource(R.drawable.circle_purple);
Slide slide = new Slide(Gravity.BOTTOM);
slide.setDuration(1000L);
getWindow().setEnterTransition(slide);
break;
case "fade":
imageView.setBackgroundResource(R.drawable.circle_blue);
Fade fade = new Fade();
fade.setDuration(1000L);
getWindow().setEnterTransition(fade);
break;
}
让我们来分析以下具体发生了什么：
- 首先ActivityA启动了ActivityB；
- Transition Framework找到A的退出动画（Slide）并且应用；
- Transition Framework找到B的进入动画（Explode）并且应用；
- 返回事件被触发后，Transition Framework执行进入动画和退出动画的逆向过程（但是如果我们定义了returnTransition和reenterTransition动画，返回效果将会按照我们定义的动画执行）。
2.元素共享
1.首先我们需要做的仍然是去定义Theme的
android:windowContentTransitions为true；2.然后对不同activity或fragment的共享的view元素设置统一的 android:transitionName：
activity_main.xml
<LinearLayout
android:id="@+id/tv_share_elements"
android:layout_width="match_parent"
android:layout_height="56dp"
android:background="?android:attr/selectableItemBackground"
android:orientation="horizontal"
android:paddingLeft="@dimen/activity_horizontal_margin">
<ImageView
android:id="@+id/img_share"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:background="@drawable/circle_orange"
android:transitionName="share" />
<TextView
android:id="@+id/tv_share"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="12dp"
android:gravity="center_vertical"
android:text="Shared Elements"
android:transitionName="share_text"/>
</LinearLayout>
fragment_share_elements1.xml
<View
android:id="@+id/view_top"
android:layout_width="match_parent"
android:layout_height="200dp"
android:background="@color/color_orange"
android:transitionName="share">
</View>
<TextView
android:id="@+id/tv_transition_type"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/activity_vertical_margin"
android:gravity="center"
android:text="Shared Elements"
android:transitionName="share_text" />
fragment_share_elements2.xml
<ImageView
android:id="@+id/img_share"
android:layout_width="120dp"
android:layout_height="120dp"
android:layout_gravity="center_horizontal"
android:layout_marginTop="20dp"
android:background="@drawable/circle_orange"
android:transitionName="share" />
3.使用ActivityOptions.makeSceneTransitionAnimation()来定义共享的view和transitionName
MainActivity.java
mIntent.setClass(this, ShareElementsActivity.class);
ActivityOptions transitionActivityOptions = ActivityOptions.makeSceneTransitionAnimation(MainActivity.this, findViewById(R.id.img_share), "share");
startActivity(mIntent, transitionActivityOptions.toBundle());
ShareElementsFragment1.java
Slide slideTransition = new Slide(Gravity.LEFT);
slideTransition.setDuration(1000L);
ChangeBounds changeBoundsTransition = new ChangeBounds();
changeBoundsTransition.setDuration(1000L);
sharedElementFragment2.setEnterTransition(slideTransition);
sharedElementFragment2.setAllowEnterTransitionOverlap(true);
sharedElementFragment2.setAllowReturnTransitionOverlap(true);
sharedElementFragment2.setSharedElementEnterTransition(changeBoundsTransition);
getFragmentManager().beginTransaction()
.replace(R.id.framelayout_container, sharedElementFragment2)
.addToBackStack(null)
.addSharedElement(sharedView, "share")
.commit();
如果两个不同界面有多个元素需要共享的话，使用Pair来包装
mIntent.setClass(this, ShareElementsActivity.class);
ActivityOptions transitionActivityOptions = ActivityOptions.makeSceneTransitionAnimation(MainActivity.this
, Pair.create(findViewById(R.id.img_share), "share")
, Pair.create(findViewById(R.id.tv_share), "share_text"));
startActivity(mIntent, transitionActivityOptions.toBundle());
3.水波纹散开效果
这里我们实现了在RevealActivity中两个View的更换，点击右下角切换按钮，水波纹开始散开，第一个View逐渐消失，第二个View逐渐出现。
activity_reveal.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ll_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/tv_reveal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="@dimen/activity_horizontal_margin"
android:text="acon ipsum dolor amet cupidatat bresaola minim, aliquip beef aute ea porchetta. Meatball brisket do, rump in beef ea ham hock spare ribs mollit qui dolore ipsum voluptate cow. Drumstick prosciutto salami duis jerky jowl. Mollit ball tip short ribs doner fugiat frankfurter leberkas andouille kevin pork loin nostrud ham culpa. Rump pariatur ham hock excepteur picanha pork. Corned beef flank proident shankle rump." />
<TextView
android:id="@+id/tv_reveal2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/color_blue"
android:padding="@dimen/activity_vertical_margin"
android:text="This is the content, we set it visible when the animation finished"
android:textColor="@android:color/white"
android:textSize="18sp"
android:visibility="gone" />
<ImageView
android:id="@+id/img_green"
android:layout_width="56dp"
android:layout_height="56dp"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_marginBottom="@dimen/activity_vertical_margin"
android:layout_marginRight="@dimen/activity_vertical_margin"
android:background="@drawable/circle_green"
android:transitionName="share" />
</RelativeLayout>
RevealActivity.java
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_reveal);
relativeLayout = (RelativeLayout) findViewById(R.id.ll_container);
textView = (TextView) findViewById(R.id.tv_reveal);
textview2 = (TextView) findViewById(R.id.tv_reveal2);
findViewById(R.id.img_green).setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
float finalRadius = (float) Math.hypot(relativeLayout.getWidth(), relativeLayout.getHeight());
Animator anim = ViewAnimationUtils.createCircularReveal(textview2, (int) motionEvent.getRawX(), (int) motionEvent.getRawY(), 0, finalRadius);
anim.setDuration(1000L);
anim.setInterpolator(new AccelerateDecelerateInterpolator());
anim.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
textview2.setVisibility(View.VISIBLE);
}
@Override
public void onAnimationEnd(Animator animator) {
//textView.setVisibility(View.VISIBLE);
}
@Override
public void onAnimationCancel(Animator animator) {
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});
anim.start();
}
return false;
}
});
}
createCircularReveal的各参数代表的具体含义参照这里。
Demo源码
https://github.com/Trisaa/MaterialTranstion
参考资料
https://github.com/lgvalle/Material-Animations
https://github.com/hehonghui/android-tech-frontier/tree/master/others/%E6%B7%B1%E5%85%A5%E6%B5%85%E5%87%BAAndroid%20%E6%96%B0%E7%89%B9%E6%80%A7-Transition-Part-1
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