bherbst

public class MainActivity extends Activity {
  private static final String BACK_STACK_ROOT_TAG = "root_fragment";
  
  public void onTabSelected(int position) {
    // Pop off everything up to and including the current tab
    FragmentManager fragmentManager = getSupportFragmentManager();
    fragmentManager.popBackStack(BACK_STACK_ROOT_TAG, FragmentManager.POP_BACK_STACK_INCLUSIVE);
  
    // Add the new tab fragment
    fragmentManager.beginTransaction()

bherbst

public void addSubscreen(Fragment fragment) {
    getSupportManager()
        .beginTransaction()
        .replace(R.id.container, fragment)
        .addToBackStack(null)
        .commit();
    subscreensOnTheStack++;
}

bherbst

public class PicassoFragment extends Fragment {
    private static final String KEY_WILL_ANIMATE_IMAGE = "keyWillAnimateImage";
	
    private boolean willAnimateImage;
    
    /**
     * Get a new PicassoFragment instance
     * @param wilAnimateImage True if the image will animate in during the tragment transaction
     */
    public static PicassoFragment newInstance(boolean willAnimateImage) {

bherbst

/**
 * Similar to {@link ChangeImageTransform}, but prior to capturing the end values for the transition
 * it will copy the drawable from the starting image to the ending image.
 *
 * This allows the image transform to work when the end ImageView doesn't immediately have content,
 * such as when the image will be loaded via Picasso.
 *
 * @author bherbst
 */
@TargetApi(Build.VERSION_CODES.LOLLIPOP)

bherbst

DetailsFragment details = DetailsFragment.newInstance();

// Note that we need the API version check here because the actual transition classes (e.g. Fade)
// are not in the support library and are only available in API 21+. The methods we are calling on the Fragment
// ARE available in the support library (though they don't do anything on API < 21)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
    details.setSharedElementEnterTransition(new DetailsTransition());
    details.setEnterTransition(new Fade());
    setExitTransition(new Fade());
    details.setSharedElementReturnTransition(new DetailsTransition());

bherbst

public class DetailsTransition extends TransitionSet {
    public DetailsTransition() {
        setOrdering(ORDERING_TOGETHER);
        addTransition(new ChangeBounds()).
                addTransition(new ChangeTransform()).
                addTransition(new ChangeImageTransform()));
    }
}

bherbst

<merge xmlns:android="http://schemas.android.com/apk/res/android" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" >

        <ProgressBar
            android:id="@+id/redBar"
            style="@android:style/Widget.ProgressBar.Horizontal"