Making it rain expandable textz

details.java

package com.electricobjects.client.collections;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.app.Activity;
import android.support.v7.widget.RecyclerView;
import android.text.Editable;
import android.text.Layout;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.method.LinkMovementMethod;
import android.text.style.URLSpan;
import android.text.style.UnderlineSpan;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.widget.ImageView;
import android.widget.TextView;

import com.electricobjects.client.R;
import com.electricobjects.client.models.Collection;
import com.electricobjects.client.util.NavigationUtil;
import com.electricobjects.client.util.image.ImageUtil;

/**
 * Created by koral on 20.05.15.
 * Modified by lisa on 25.08.15.
 */
class CollectionDetailsViewHolder extends RecyclerView.ViewHolder {

    private final TextView mCollectionBody;
    private final TextView mReadMoreButton;

    public CollectionDetailsViewHolder(View itemView) {
        super(itemView);

        mCollectionBody = (TextView) itemView.findViewById(R.id.collection_body);
        mReadMoreButton = (TextView) itemView.findViewById(R.id.button_read_more);

        int blueColor = itemView.getResources().getColor(R.color.friendly_blue);
        mCollectionBody.setLinkTextColor(blueColor);
        mCollectionBody.setMovementMethod(LinkMovementMethod.getInstance());

        // Make the Read More button into a blue link thing
        Spannable text = new SpannableString(mReadMoreButton.getText());
        text.setSpan(new UnderlineSpan(), 0, text.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        mReadMoreButton.setText(text);

        mReadMoreButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ObjectAnimator animation = ObjectAnimator.ofInt(mCollectionBody, "maxLines", 50);
                animation.setInterpolator(new AccelerateDecelerateInterpolator());
                animation.addListener(new AnimatorListenerAdapter() {
                    @Override
                    public void onAnimationStart(Animator animation) {
                        mReadMoreButton.animate()
                                .alpha(0.0f)
                                .setInterpolator(new AccelerateDecelerateInterpolator())
                                .setDuration(300)
                                .setListener(new AnimatorListenerAdapter() {
                                    @Override
                                    public void onAnimationEnd(Animator animation) {
                                        mReadMoreButton.setVisibility(View.GONE);
                                    }
                                })
                                .start();
                    }
                });
                animation.setDuration(300).start();
            }
        });

        // Only show the Read More button if need to (set up below)
        mReadMoreButton.setVisibility(View.GONE);
    }

    // Called in the RecyclerView adapter onBind method
    public void bind(Collection collection) {
        setupBodyText(collection.getFormattedBody());
        ViewTreeObserver vto = mCollectionBody.getViewTreeObserver();
        vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                mCollectionBody.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                Layout layout = mCollectionBody.getLayout();
                if (layout != null && layout.getLineCount() > 0) {
                    int lines = layout.getLineCount();
                    boolean isEllipsized = (mCollectionBody.getMaxLines() < layout.getLineCount());
                    if (isEllipsized) {
                        // Show the Read More button
                        mReadMoreButton.setVisibility(View.VISIBLE);
                        // TODO: insert ... at the end of the line
                    }
                }
            }
        });
    }
}

updated.java

    public void bind(Collection collection) {
        // other set up stuff...
        ViewTreeObserver vto = mCollectionBody.getViewTreeObserver();
        vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                mCollectionBody.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                final Layout layout = mCollectionBody.getLayout();
                if (layout != null && layout.getLineCount() > 0) {
                    boolean isEllipsized = (mCollectionBody.getMaxLines() < layout.getLineCount());
                    if (isEllipsized) {
                        mReadMoreButton.setVisibility(View.VISIBLE);
                        mReadMoreButton.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                                ObjectAnimator animation = ObjectAnimator.ofInt(mCollectionBody, "maxLines", layout.getLineCount());
                                animation.setInterpolator(new AccelerateDecelerateInterpolator());
                                animation.addListener(new AnimatorListenerAdapter() {
                                    @Override
                                    public void onAnimationStart(Animator animation) {
                                        mReadMoreButton.animate()
                                                .alpha(0.0f)
                                                .setInterpolator(new AccelerateDecelerateInterpolator())
                                                .setDuration(300)
                                                .setListener(new AnimatorListenerAdapter() {
                                                    @Override
                                                    public void onAnimationEnd(Animator animation) {
                                                        mReadMoreButton.setVisibility(View.GONE);
                                                    }
                                                })
                                                .start();
                                    }
                                });
                                animation.setDuration(300).start();
                            }
                        });

                        // TODO: insert ... at the end of the line
                    }
                }
            }
        });