问题
I find that there is a quick way to create animation with ConstraintSet for ConstrainLayout Activity. Faster than use TransitionManager for RelativeLayout
ConstraintSet use two xml file for an Activity. One for the first position and next one for the destination.
I want to create something like this:
https://media.giphy.com/media/2UwXdWEoLWe9iQMFIY/giphy.gif
But there is no clearly instruction show how to use it in Java. Anyone had done this can show me the source code or link to some post like that.
Thanks for reading the post.
回答1:
This is possible with ConstraintSet. They key is two have two layouts one layout has ui elements of the screen and the other has elements on the screen. Now you can use TransitionManager with interpolator and duration of your choice and animate the layout changes.
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
android:id="@+id/constraint"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#181818"
tools:context=".MainActivity">
<ImageView
android:id="@+id/backgroundImage"
android:layout_width="0dp"
android:layout_height="0dp"
android:src="@drawable/mugello"
android:scaleType="centerCrop"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="JUNE 3, 2018"
app:layout_constraintRight_toRightOf="@+id/title"
app:layout_constraintBottom_toBottomOf="@+id/title"
android:textSize="12sp"
android:background="#d3d3d3"
android:paddingStart="16dp"
android:paddingEnd="16dp"
android:paddingTop="3dp"
android:paddingBottom="3dp"/>
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="48dp"
android:background="#F44336"
android:paddingBottom="8dp"
android:paddingEnd="24dp"
android:paddingStart="24dp"
android:paddingTop="8dp"
android:text="Mugello Circuit"
android:textColor="#FFFF"
android:textSize="45sp"
app:layout_constraintRight_toLeftOf="@+id/backgroundImage"
app:layout_constraintTop_toTopOf="parent" />
<View
android:id="@+id/fadeBackgroudView"
android:layout_width="wrap_content"
android:layout_height="90dp"
android:foreground="@drawable/gradient_variant"
app:layout_constraintBottom_toTopOf="@+id/description" />
<TextView
android:id="@+id/tap"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="12dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:text="Tap for info"
android:textSize="15sp"
android:textColor="#ffffff"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="@+id/description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="The Mugello is a historic region and valley in northern Tuscany, in Italy. It is located to the north of the city of Florence and consists of the northernmost portion of the Metropolitan City of Florence. It is connected to the separate Santerno river valley by the Futa Pass."
android:textSize="22sp"
android:textColor="#FFFF"
android:background="#181818"
android:gravity="center"
android:paddingStart="8dp"
android:paddingEnd="8dp"
android:paddingBottom="8dp"
app:layout_constraintTop_toBottomOf="@+id/backgroundImage"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"/>
</android.support.constraint.ConstraintLayout>
activity_main_detail.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<ImageView
android:id="@+id/backgroundImage"
android:layout_width="0dp"
android:layout_height="0dp"
android:scaleType="centerCrop"
android:src="@drawable/mugello"
app:layout_constraintBottom_toTopOf="@+id/description"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="48dp"
android:background="#F44336"
android:paddingBottom="8dp"
android:paddingEnd="24dp"
android:paddingStart="24dp"
android:paddingTop="8dp"
android:text="Mugello Circuit"
android:textColor="#FFFF"
android:textSize="45sp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="JUNE 3, 2018"
app:layout_constraintRight_toRightOf="@+id/title"
app:layout_constraintTop_toBottomOf="@+id/title"
android:textSize="12sp"
android:background="#d3d3d3"
android:paddingStart="16dp"
android:paddingEnd="16dp"
android:paddingTop="3dp"
android:paddingBottom="3dp"/>
<View
android:id="@+id/fadeBackgroudView"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:foreground="@drawable/gradient"
app:layout_constraintBottom_toTopOf="@+id/description" />
<TextView
android:id="@+id/tap"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:text="Tap for info"
android:textSize="15sp"
android:textColor="#ffffff"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="@+id/description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="The Mugello is a historic region and valley in northern Tuscany, in Italy. It is located to the north of the city of Florence and consists of the northernmost portion of the Metropolitan City of Florence. It is connected to the separate Santerno river valley by the Futa Pass."
android:textSize="22sp"
android:textColor="#FFFF"
android:gravity="center"
android:background="#181818"
android:paddingStart="8dp"
android:paddingEnd="8dp"
android:paddingBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"/>
</android.support.constraint.ConstraintLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity {
private boolean show = false;
private ImageView backgroundImage;
private ConstraintLayout constraint;
private ConstraintSet constraintSet = new ConstraintSet();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
constraint = findViewById(R.id.constraint);
backgroundImage = findViewById(R.id.backgroundImage);
backgroundImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(show)
hideComponents(); // if the animation is shown, we hide back the views
else
showComponents() ;// if the animation is NOT shown, we animate the views
}
});
}
private void showComponents(){
show = true;
constraintSet.clone(this, R.layout.activity_main_detail);
Transition transition = new ChangeBounds();
transition.setInterpolator(new AnticipateOvershootInterpolator(1.0f));
transition.setDuration(1000);
TransitionManager.beginDelayedTransition(constraint, transition);
constraintSet.applyTo(constraint);
}
private void hideComponents(){
show = false;
constraintSet.clone(this, R.layout.activity_main);
Transition transition = new ChangeBounds();
transition.setInterpolator(new AnticipateOvershootInterpolator(1.0f));
transition.setDuration(1000);
TransitionManager.beginDelayedTransition(constraint, transition);
constraintSet.applyTo(constraint);
}
}
Here's a slide share on ConstraintLayout https://speakerdeck.com/camaelon/advanced-animations-and-constraintlayout
来源：https://stackoverflow.com/questions/49462293/how-to-use-constraintset-for-animation-in-android-with-java