Android: Create shared transitions

In Android, you can make cool animations, that let objects move into another activity. For that, you should use shared transitions.

Get started

To start you have to add this tag android:transitionName="transition_name" to your view, that is going to move.
Chose a unique name for the transition, else it won't work.

<ImageView
        android:id="@+id/image"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:transitionName="transition_image"
        android:src="@drawable/avatar" />

Now you can go on with your activity.

Intent intent = new Intent(MainActivity.this, SecondActivity.class);

ImageView imageView = findViewById(R.id.image);

ActivityOptionsCompat options = ActivityOptionsCompat.makeSceneTransitionAnimation(MainActivity.this, 
    (View) imageView, //put here the view, that should be shared
    "transition_image"); //this has to be the string, you set at the transitionName tag

//start the activity with the options as bundle
startActivity(intent, options.toBundle());

Now make sure, you have an ImageView with the same transitionName tag on the second activity's layout and you are ready to go :)

When you also want to have the shared transition backward, you just have to replace every finish(); call with supportFinishAfterTransition();

Tip

When you are loading your images with glide or picasso, there are often problems with shared transitions. For that there is a trick:
Add this code to your second activity.

//This pauses the transition
supportPostponeEnterTransition();

Glide
    .with( SecondActivity.this )
    .load( url )
    .diskCacheStrategy(DiskCacheStrategy.SOURCE) //cache the image, to reduce the time to wait
    .dontAnimate() //make sure, there is no animation on the image
    .listener(new RequestListener<String, GlideDrawable>() {
        @Override
        public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {
            
            //loading the image failed, so you can display an error or anyways finish the transition
            supportStartPostponedEnterTransition();
            return false;

        }

        @Override
        public boolean onResourceReady(GlideDrawable resource, String model, Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {

            //now when the image has loaded, you can resume the transition
            supportStartPostponedEnterTransition();
            return false;

        }
    })
    .into( mImageProfile );

Basically, you could also use this to wait until a server request is done. Just try it out :)

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