Mistake in TransitionAnimation - "Shared element must not be null"

[esther]

Mistake:

Process: pc.dd.fragment_animation, PID: 22407  java.lang.IllegalArgumentException: Shared element must not be null ...at pc.dd.fragment_animation.MainClass$1.onClick(MainClass.java:91)

Xml main activate:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="pc.dd.fragment_animation.MainClass">
<LinearLayout
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ImageView
        android:layout_width="fill_parent"
        android:layout_height="200dp"
        android:transitionName="source2"
        android:id="@+id/source"
        android:layout_gravity="center_horizontal"
        android:src="@drawable/image1"
        android:scaleType="center" />
</LinearLayout>

Code 2 activates which we move after animation:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
    android:layout_width="wrap_content"
    android:layout_height="200dp"
    android:id="@+id/image_target"
    android:layout_gravity="center_horizontal"
    android:transitionName="tar"
    android:src="@drawable/image1"
    android:scaleType="center" />

Code onCreate:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main_class);
final View photo = findViewById (R.id.image_target);
    final ImageView image = (ImageView) findViewById(R.id.source);
image.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

Intent intent = new Intent(MainClass.this,   Second_Activity.class);

intent.setAction(intent.ACTION_VIEW);

intent.putExtra(MainClass.this.EXTRA_PHOTO, R.drawable.image1);

//String transitionName = (String) findViewById(R.id.image_target);

startActivity(intent,

ActivityOptions.makeSceneTransitionAnimation(

MainClass.this,

photo

,

"tar"

).toBundle());

}

});

What's wrong?

[Trenton]

You don't have an image-target element on the main activist, and you're trying to find it and transfer it to the transition anaemia. If the source element is to turn into a new activism in image_target, you should turn it into animation. Yeah, and I think the transition will work if it's just for the main activist to change. android:transitionName="source2" ♪ android:transitionName="tar" and the code generating ActivityOptions.