playlistbrowseractivity.java

Android平台上的media player, iPhone风格

        if (mCreateShortcut) {
            return;
        }

        AdapterContextMenuInfo mi = (AdapterContextMenuInfo) menuInfoIn;
        
        if (mi.id < 0) {
            menu.add(0, PLAY_SELECTION, 0, R.string.play_selection);
            menu.add(0, EDIT_PLAYLIST, 0, R.string.edit_playlist_menu);
            mPlaylistCursor.moveToPosition(mi.position);
            menu.setHeaderTitle(mPlaylistCursor.getString(mPlaylistCursor.getColumnIndex(MediaStore.Audio.Playlists.NAME)));
        } else {
            menu.add(0, PLAY_SELECTION, 0, R.string.play_selection);
            menu.add(0, DELETE_PLAYLIST, 0, R.string.delete_playlist_menu);
            menu.add(0, EDIT_PLAYLIST, 0, R.string.edit_playlist_menu);
            menu.add(0, RENAME_PLAYLIST, 0, R.string.rename_playlist_menu);
            mPlaylistCursor.moveToPosition(mi.position);
            menu.setHeaderTitle(mPlaylistCursor.getString(mPlaylistCursor.getColumnIndex(MediaStore.Audio.Playlists.NAME)));
        }
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        AdapterContextMenuInfo mi = (AdapterContextMenuInfo) item.getMenuInfo();
        switch (item.getItemId()) {
            case PLAY_SELECTION:
                if (mi.id == RECENTLY_ADDED_PLAYLIST) {
                    playRecentlyAdded();
                } else {
                    MusicUtils.playPlaylist(this, mi.id);
                }
                break;
            case DELETE_PLAYLIST:
                mPlaylistCursor.moveToPosition(mi.position);
//                mPlaylistCursor.deleteRow();
//                mPlaylistCursor.commitUpdates();
                Toast.makeText(this, R.string.playlist_deleted_message, Toast.LENGTH_SHORT).show();
                if (mPlaylistCursor.getCount() == 0) {
                    setTitle(R.string.no_playlists_title);
                }
                break;
            case EDIT_PLAYLIST:
                if (mi.id == RECENTLY_ADDED_PLAYLIST) {
                    Intent intent = new Intent();
                    intent.setClass(this, WeekSelector.class);
                    startActivityForResult(intent, CHANGE_WEEKS);
                    return true;
                } else {
                    Intent intent = new Intent(Intent.ACTION_EDIT);
                    intent.setDataAndType(Uri.EMPTY, "vnd.android.cursor.dir/Track");
                    intent.putExtra("playlist", Long.valueOf(mi.id).toString());
                    startActivity(intent);
                }
                break;
            case RENAME_PLAYLIST:
                Intent intent = new Intent();
                intent.setClass(this, RenamePlaylist.class);
                intent.putExtra("rename", mi.id);
                startActivityForResult(intent, RENAME_PLAYLIST);
                break;
        }
        return true;
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        switch (requestCode) {
            case SCAN_DONE:
                if (resultCode == RESULT_CANCELED) {
                    finish();
                } else {
                    init();
                }
                break;
        }
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id)
    {
        if (mCreateShortcut) {
            final Intent shortcut = new Intent();
            shortcut.setAction(Intent.ACTION_VIEW);
            shortcut.setDataAndType(Uri.EMPTY, "vnd.android.cursor.dir/Playlist");
            shortcut.putExtra("playlist", String.valueOf(id));

            final Intent intent = new Intent();
            intent.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcut);
            intent.putExtra(Intent.EXTRA_SHORTCUT_NAME, ((TextView) v.findViewById(R.id.line1)).getText());
            intent.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, Intent.ShortcutIconResource.fromContext(
                    this, R.drawable.app_music));

            setResult(RESULT_OK, intent);
            finish();
            return;
        }
        if (id == RECENTLY_ADDED_PLAYLIST) {
            playRecentlyAdded();
        } else {
            MusicUtils.playPlaylist(this, id);
        }
    }

    private void playRecentlyAdded() {
        // do a query for all playlists in the last X weeks
        int X = MusicUtils.getIntPref(this, "numweeks", 2) * (3600 * 24 * 7);
        final String[] ccols = new String[] { MediaStore.Audio.Media._ID};
        String where = MediaStore.MediaColumns.DATE_ADDED + ">" + (System.currentTimeMillis() / 1000 - X);
        Cursor cursor = MusicUtils.query(this, MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                ccols, where, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
        
        if (cursor == null) {
            // Todo: show a message
            return;
        }
        int len = cursor.getCount();
        int [] list = new int[len];
        for (int i = 0; i < len; i++) {
            cursor.moveToNext();
            list[i] = cursor.getInt(0);
        }
        cursor.close();
        MusicUtils.playAll(this, list, 0);
    }
    
    private Cursor getPlaylistCursor(String filterstring) {
        String[] cols = new String[] {
                MediaStore.Audio.Playlists._ID,
                MediaStore.Audio.Playlists.NAME
        };

        StringBuilder where = new StringBuilder();
        where.append(MediaStore.Audio.Playlists.NAME + " != ''");
        
        // Add in the filtering constraints
        String [] keywords = null;
        if (filterstring != null) {
            String [] searchWords = filterstring.split(" ");
            keywords = new String[searchWords.length];
            Collator col = Collator.getInstance();
            col.setStrength(Collator.PRIMARY);
            for (int i = 0; i < searchWords.length; i++) {
                keywords[i] = '%' + searchWords[i] + '%';
            }
            for (int i = 0; i < searchWords.length; i++) {
                where.append(" AND ");
                where.append(MediaStore.Audio.Playlists.NAME + " LIKE ?");
            }
        }
        
        String whereclause = where.toString();
        
        Cursor results = MusicUtils.query(this, MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI,
            cols, whereclause, keywords,
            MediaStore.Audio.Playlists.NAME);
        
        if (results == null) {
            return null;
        }
        ArrayList<ArrayList> autoplaylists = new ArrayList<ArrayList>();
        if (mCreateShortcut) {
            ArrayList<Object> all = new ArrayList<Object>(2);
            all.add(ALL_SONGS_PLAYLIST);
            all.add(getString(R.string.play_all));
            autoplaylists.add(all);
        }
        ArrayList<Object> recent = new ArrayList<Object>(2);
        recent.add(RECENTLY_ADDED_PLAYLIST);
        recent.add(getString(R.string.recentlyadded));
        autoplaylists.add(recent);

        ArrayListCursor autoplaylistscursor = new ArrayListCursor(cols, autoplaylists);
        
        Cursor c = new MergeCursor(new Cursor [] {autoplaylistscursor, results});
        
        return c;
    }
    
    class PlaylistListAdapter extends SimpleCursorAdapter {
        int mTitleIdx;

        PlaylistListAdapter(Context context, int layout, Cursor cursor, String[] from, int[] to) {
            super(context, layout, cursor, from, to);
            
            mTitleIdx = cursor.getColumnIndex(MediaStore.Audio.Playlists.NAME);
        }

        @Override
        public void bindView(View view, Context context, Cursor cursor) {
            
            TextView tv = (TextView) view.findViewById(R.id.line1);
            
            String name = cursor.getString(mTitleIdx);
            tv.setText(name);
            
            ImageView iv = (ImageView) view.findViewById(R.id.icon);
            iv.setImageResource(R.drawable.ic_mp_playlist_list);
            ViewGroup.LayoutParams p = iv.getLayoutParams();
            p.width = ViewGroup.LayoutParams.WRAP_CONTENT;
            p.height = ViewGroup.LayoutParams.WRAP_CONTENT;

//            iv = (ImageView) view.findViewById(R.id.play_indicator);
//            iv.setVisibility(View.GONE);
        }

        @Override
        public void changeCursor(Cursor cursor) {
            super.changeCursor(cursor);
            mPlaylistCursor = cursor;
        }
        @Override
        public Cursor runQueryOnBackgroundThread(CharSequence constraint) {
            return getPlaylistCursor(constraint.toString());
        }
    }
    
    private Cursor mPlaylistCursor;
}