Start motion scene programmatically

问题

I have a motion layout with this layoutDescription: app:layoutDescription="@xml/scene"

scene.xml

<MotionScene
    xmlns:motion="http://schemas.android.com/apk/res-auto">

    <Transition
        motion:constraintSetStart="@layout/view_home_card_start"
        motion:constraintSetEnd="@layout/view_home_card_end"
        motion:duration="1000">
        <OnSwipe
            motion:touchAnchorId="@+id/button"
            motion:touchAnchorSide="left"
            motion:dragDirection="dragLeft" />
    </Transition>

</MotionScene>

I think that the xml of view_home_card_start and view_home_card_end is irrelevant.

How can I call this animation programatically?

回答1:

Finally Im doing this:

((MotionLayout)findViewById(R.id.motionLayout)).transitionToEnd();
((MotionLayout)findViewById(R.id.motionLayout)).transitionToStart();

回答2:

You can also do this in your xml with

motion:autoTransition="animateToEnd"

and

motion:autoTransition="animateToStart"

回答3:

If anyone's doing this from a fragment:

Import:

import androidx.constraintlayout.motion.widget.MotionLayout;

Instantiate MotionLayout:

MotionLayout motionLayout = view.findViewById(R.id.your_motion_layout);

Transition to the end/start of motion:
```
motionLayout.transitionToStart();
```

    motionLayout.transitionToEnd();

回答4:

In Latest Update of Constraint **2.0.0-beta1** Layout There are Public methods add in motion layout 
        you can get these methods with the help of motionlayout id 
    **motionLayout** 

     1. public void setProgress (float pos) 
     2. public void setTransition (int
           beginId,int endId)  
     3. public void setTransitionDuration (int
               milliseconds)  public void setTransitionListener
               (MotionLayout.TransitionListener listener)

     4. public void setState (int
               id,int screenWidth, 
                             int screenHeight)

     5. if(wantShowUi)
            {
                newUserActivityBinding.coordinatorLayout.transitionToStart();
            }
            else
            {
                newUserActivityBinding.coordinatorLayout.transitionToEnd();
            }

      <android.support.constraint.motion.MotionLayout
                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:id="@+id/motionLayout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layoutDescription="@xml/motion_scene_01"
                tools:showPaths="true">

            <View
                    android:id="@+id/button"
                    android:background="@color/colorAccent"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:soundEffectsEnabled="false"
                    tools:layout_editor_absoluteY="361dp"
                    tools:layout_editor_absoluteX="61dp"/>


        </android.support.constraint.motion.MotionLayout>

来源：https://stackoverflow.com/questions/52437946/start-motion-scene-programmatically

标签

android

android-motionlayout