LocalMusicAdapter.java

package com.tadpolemusic.adapter;

import java.util.ArrayList;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ImageView;
import android.widget.SectionIndexer;
import android.widget.TextView;

import com.quickactionbar.QuickAction;
import com.quickactionbar.QuickActionGrid;
import com.quickactionbar.QuickActionWidget;
import com.tadpolemusic.R;
import com.tadpolemusic.activity.dialog.LocalMusicDeleteDialog;
import com.tadpolemusic.media.LocalMusicItem;
import com.tadpolemusic.media.MusicData;

/**
 * <br>==========================
 * <br> author：Zenip
 * <br> email：lxyczh@gmail.com
 * <br> create：2013-1-31
 * <br>==========================
 */
public class LocalMusicAdapter extends ListViewAdapter<MusicData> implements SectionIndexer, OnScrollListener {

    public static interface OnSectionChangeListener {
        public void handle(char letter);
    }

    private OnSectionChangeListener mSectionChangeListener;

    public LocalMusicAdapter(Activity context) {
        super(context);
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        final MusicData item = (MusicData) getItem(position);
        final LocalMusicAdapter me = this;
        View view = convertView;
        ViewHolder viewHolder = null;
        if (view == null) {
            view = getLayoutInflater().inflate(R.layout.list_item_local_music, null);
            viewHolder = new ViewHolder();
            viewHolder.textViewSectionTitle = (TextView) view.findViewById(R.id.text_view_section_title);
            viewHolder.textViewMusicTitle = (TextView) view.findViewById(R.id.text_view_music_title);
            viewHolder.imageViewIcon = (ImageView) view.findViewById(R.id.image_view_icon);
            viewHolder.buttonOperation = (View) view.findViewById(R.id.btn_operation);
            viewHolder.imageViewSelect = (ImageView) view.findViewById(R.id.image_view_select);
            view.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }


        String section = item.getFirstLetterInUpcase();
        // first item show the section
        if (position == 0) {
            viewHolder.textViewSectionTitle.setVisibility(View.VISIBLE);
            viewHolder.textViewSectionTitle.setText(section);
        }
        // if it is the new section , show too.
        else {
            String lastItemSection = mList.get(position - 1).getFirstLetterInUpcase();
            if (section.equals(lastItemSection)) {
                viewHolder.textViewSectionTitle.setVisibility(View.GONE);
            } else {
                viewHolder.textViewSectionTitle.setVisibility(View.VISIBLE);
                viewHolder.textViewSectionTitle.setText(section);
            }
        }

        if (position == super.getSelectedPostion()) {
            viewHolder.imageViewSelect.setVisibility(View.VISIBLE);
        } else {
            viewHolder.imageViewSelect.setVisibility(View.INVISIBLE);
        }

        viewHolder.textViewMusicTitle.setText(item.musicName);
        viewHolder.textViewSectionTitle.setText(item.getFirstLetterInUpcase());
        viewHolder.buttonOperation.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Context ctx = v.getContext();

                QuickActionGrid quickActionGrid = new QuickActionGrid(ctx);
                quickActionGrid.setWidth(500);
                quickActionGrid.setNumColumns(3);

                QuickAction qaSetRing = new QuickAction(ctx, R.drawable.audio_list_item_rightmenu_setring_default, "设为铃声");
                QuickAction qaActionDel = new QuickAction(ctx, R.drawable.audio_list_item_rightmenu_delete_default, "删除");
                QuickAction qaActionShare = new QuickAction(ctx, R.drawable.audio_list_item_rightmenu_share_default, "分享");

                final ArrayList<QuickAction> qaList = new ArrayList<QuickAction>();
                qaList.add(qaSetRing);
                qaList.add(qaActionDel);
                qaList.add(qaActionShare);

                for (int i = 0, N = qaList.size(); i < N; i++) {
                    quickActionGrid.addQuickAction(qaList.get(i));
                }

                quickActionGrid.setOnQuickActionClickListener(new QuickActionGrid.OnQuickActionClickListener() {
                    @Override
                    public void onQuickActionClicked(QuickActionWidget widget, int position) {
                        final Context context = widget.getContentView().getContext();
                        switch (position) {
                        case 0:
                            item.setMyRingtone(context);
                            break;
                        case 1:
                            LocalMusicDeleteDialog delDialog = new LocalMusicDeleteDialog(context);
                            delDialog.setTip("你确定删除音乐“" + item.musicName + "”");
                            delDialog.setPositiveButtonListener(new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {
                                    LocalMusicDeleteDialog d = (LocalMusicDeleteDialog) dialog;
                                    boolean isToDelFile = d.isNeedToDeleteFile();
                                    me.getList().remove(item);
                                    me.notifyDataSetChanged();
                                    item.deleteFromDB(d.getContext());
                                    if (isToDelFile) {
                                        item.deleteFile();
                                    }
                                }
                            });



                            delDialog.setTitle("删除歌曲");
                            delDialog.show();
                            break;
                        default:
                            break;
                        }
                    }
                });
                quickActionGrid.show(v);

            }
        });

        return view;
    }


    public void showDeleteDialog(final LocalMusicItem item) {
        final LocalMusicAdapter me = this;
        AlertDialog.Builder ab = new AlertDialog.Builder(this.getContext());
        ab.setTitle("确定要删除?");
        ab.setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                mList.remove(item);
                item.delete(mContext);
                me.notifyDataSetChanged();
            }
        });
        ab.setNegativeButton("取消", null);
        ab.show();
    }

    /**
     * Class implementing holder pattern,
     * performance boost
     * 
     * @author Zenip
     */
    static class ViewHolder {
        ImageView imageViewIcon;
        ImageView imageViewSelect;
        TextView textViewMusicTitle;
        TextView textViewSectionTitle;
        View buttonOperation;
    }


    @Override
    public int getPositionForSection(int section) {
        MusicData item;
        String letter;
        for (int i = 0; i < getCount(); i++) {
            item = (MusicData) mList.get(i);
            letter = item.getFirstLetterInUpcase();
            char firstChar = letter.toUpperCase().charAt(0);
            if (letter.length() > 0 && firstChar == section) {
                return i;
            }
        }
        return -1;
    }

    @Override
    public int getSectionForPosition(int position) {
        return 0;
    }

    @Override
    public Object[] getSections() {
        return null;
    }

    public void setOnSectionChangeListener(OnSectionChangeListener listener) {
        mSectionChangeListener = listener;
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
        if (mList == null || firstVisibleItem == -1 || firstVisibleItem == 0) {
            return;
        }
        MusicData item = mList.get(firstVisibleItem);
        String firstLetter = item.getFirstLetterInUpcase();
        if (mSectionChangeListener != null) {
            mSectionChangeListener.handle(firstLetter.charAt(0));
        }
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
    }
}