Programmatically add transitionName to Toolbar Title (Android)

Question

Is it possible to programmatically set the xml property transitionName to a Toolbar title and then use it for an animation using ActivityOptionsCompat?

This is how I declare my Toolbar:

        Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
        myToolbar.setTitle("title");

And this is my xml declaration:

<android.support.v7.widget.Toolbar
        android:id="@+id/my_toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/primary_color"
        android:elevation="4dp"
        android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
        android:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

In order to add the animation I have to use the following code:

ActivityOptionsCompat options =
ActivityOptionsCompat.makeSceneTransitionAnimation(activity,
    albumCoverImageView,   // The view which starts the transition (Should be myToolbar title)
    transitionName    // The transitionName of the view
    );
ActivityCompat.startActivity(activity, intent, options.toBundle());

How can I pass the Toolbar (TextView ?) title to the makeSceneTransitionAnimation function?

Answer 1

You can get the TextView instance of the Toolbar's title and set transition by following this code:

private Toolbar mToolbar;
private TextView mTextViewToolbarTitle;

@Override
protected void onCreated(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.your_layout);
    mToolbar = (Toolbar) findViewById(R.id.your_toolbar_id);
    setSupportActionBar(mToolbar);

    mTextViewToolbarTitle = getTextViewTitle(mToolbar);
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        mTextViewTitle.setTransitionName(getString(R.string.your_transition_name));
    }
}

Copy this method in your activity:

public static TextView getTextViewTitle(Toolbar toolbar){
    TextView textViewTitle = null;
    for(int i = 0; i<toolbar.getChildCount(); i++) {
        View view = toolbar.getChildAt(i);
        if(view instanceof TextView) {
            textViewTitle = (TextView) view;
            break;
        }
    }
    return textViewTitle;
}

then start your new activity with transition by:

if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
    startActivity(intent, 
        ActivityOptionsCompat.makeSceneTransitionAnimation(this, 
                                            mTextViewToolbarTitle, 
                                            getString(R.string.your_transition_name))
                                               .toBundle());
} else {
    startActivity(intent,
        ActivityOptionsCompat.makeSceneTransitionAnimation(this).toBundle());
}