ChaptersListAdapter.java

package de.danoeh.antennapod.adapter;

import android.content.Context;
import android.support.v4.content.ContextCompat;
import android.text.Layout;
import android.text.Selection;
import android.text.Spannable;
import android.text.Spanned;
import android.text.style.ClickableSpan;
import android.text.util.Linkify;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.TextView;

import de.danoeh.antennapod.R;
import de.danoeh.antennapod.core.feed.Chapter;
import de.danoeh.antennapod.core.preferences.UserPreferences;
import de.danoeh.antennapod.core.util.ChapterUtils;
import de.danoeh.antennapod.core.util.Converter;
import de.danoeh.antennapod.core.util.playback.Playable;

public class ChaptersListAdapter extends ArrayAdapter<Chapter> {

    private static final String TAG = "ChapterListAdapter";

    private Playable media;

    private int defaultTextColor;
    private final Callback callback;

    public ChaptersListAdapter(Context context, int textViewResourceId, Callback callback) {
        super(context, textViewResourceId);
        this.callback = callback;
    }

    public void setMedia(Playable media) {
        this.media = media;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        Holder holder;

        Chapter sc = getItem(position);

        // Inflate Layout
        if (convertView == null) {
            holder = new Holder();
            LayoutInflater inflater = (LayoutInflater) getContext()
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            convertView = inflater.inflate(R.layout.simplechapter_item, parent, false);
            holder.view = convertView;
            holder.title = (TextView) convertView.findViewById(R.id.txtvTitle);
            defaultTextColor = holder.title.getTextColors().getDefaultColor();
            holder.start = (TextView) convertView.findViewById(R.id.txtvStart);
            holder.link = (TextView) convertView.findViewById(R.id.txtvLink);
            holder.butPlayChapter = (ImageButton) convertView.findViewById(R.id.butPlayChapter);
            convertView.setTag(holder);
        } else {
            holder = (Holder) convertView.getTag();

        }

        holder.title.setText(sc.getTitle());
        holder.start.setText(Converter.getDurationStringLong((int) sc
                .getStart()));
        if (sc.getLink() != null) {
            holder.link.setVisibility(View.VISIBLE);
            holder.link.setText(sc.getLink());
            Linkify.addLinks(holder.link, Linkify.WEB_URLS);
        } else {
            holder.link.setVisibility(View.GONE);
        }
        holder.link.setMovementMethod(null);
        holder.link.setOnTouchListener((v, event) -> {
            // from
            // http://stackoverflow.com/questions/7236840/android-textview-linkify-intercepts-with-parent-view-gestures
            TextView widget = (TextView) v;
            Object text = widget.getText();
            if (text instanceof Spanned) {
                Spannable buffer = (Spannable) text;

                int action = event.getAction();

                if (action == MotionEvent.ACTION_UP
                        || action == MotionEvent.ACTION_DOWN) {
                    int x = (int) event.getX();
                    int y = (int) event.getY();

                    x -= widget.getTotalPaddingLeft();
                    y -= widget.getTotalPaddingTop();

                    x += widget.getScrollX();
                    y += widget.getScrollY();

                    Layout layout = widget.getLayout();
                    int line = layout.getLineForVertical(y);
                    int off = layout.getOffsetForHorizontal(line, x);

                    ClickableSpan[] link = buffer.getSpans(off, off,
                            ClickableSpan.class);

                    if (link.length != 0) {
                        if (action == MotionEvent.ACTION_UP) {
                            link[0].onClick(widget);
                        } else if (action == MotionEvent.ACTION_DOWN){
                            Selection.setSelection(buffer,
                                    buffer.getSpanStart(link[0]),
                                    buffer.getSpanEnd(link[0]));
                        }
                        return true;
                    }
                }

            }

            return false;

        });
        holder.butPlayChapter.setOnClickListener(v -> {
            if (callback != null) {
                callback.onPlayChapterButtonClicked(position);
            }
        });
        Chapter current = ChapterUtils.getCurrentChapter(media);
        if (current != null) {
            if (current == sc) {
                int playingBackGroundColor;
                if(UserPreferences.getTheme() == R.style.Theme_AntennaPod_Dark) {
                    playingBackGroundColor = ContextCompat.getColor(getContext(), R.color.highlight_dark);
                } else {
                    playingBackGroundColor = ContextCompat.getColor(getContext(), R.color.highlight_light);
                }
                holder.view.setBackgroundColor(playingBackGroundColor);
            } else {
                holder.view.setBackgroundColor(ContextCompat.getColor(getContext(), android.R.color.transparent));
                holder.title.setTextColor(defaultTextColor);
                holder.start.setTextColor(defaultTextColor);
            }
        } else {
            Log.w(TAG, "Could not find out what the current chapter is.");
        }

        return convertView;
    }

    static class Holder {
        View view;
        TextView title;
        TextView start;
        TextView link;
        ImageButton butPlayChapter;
    }

    @Override
    public int getCount() {
        if(media == null || media.getChapters() == null) {
            return 0;
        }
        // ignore invalid chapters
        int counter = 0;
        for (Chapter chapter : media.getChapters()) {
            if (!ignoreChapter(chapter)) {
                counter++;
            }
        }
        return counter;
    }

    private boolean ignoreChapter(Chapter c) {
        return media.getDuration() > 0 && media.getDuration() < c.getStart();
    }

    @Override
    public Chapter getItem(int position) {
        int i = 0;
        for (Chapter chapter : media.getChapters()) {
            if (!ignoreChapter(chapter)) {
                if (i == position) {
                    return chapter;
                } else {
                    i++;
                }
            }
        }
        return super.getItem(position);
    }

    public interface Callback {
        void onPlayChapterButtonClicked(int position);
    }

}