trackbrowseractivity.java

Android平台上的media player, iPhone风格

                    mTrackCursor.moveToPosition(to);
                    int toidx = mTrackCursor.getInt(colidx);
                    mTrackCursor.moveToPosition(from);
//                    mTrackCursor.updateInt(colidx, toidx);
                    for (int i = from - 1; i >= to; i--) {
                        mTrackCursor.moveToPosition(i);
//                        mTrackCursor.updateInt(colidx, i + 1);
                    }
//                    mTrackCursor.commitUpdates();
                }
            }
        }
    };
    
    private TouchInterceptor.RemoveListener mRemoveListener =
        new TouchInterceptor.RemoveListener() {
        public void remove(int which) {
            removePlaylistItem(which);
        }
    };

    private void removePlaylistItem(int which) {
        View v = mTrackList.getChildAt(which - mTrackList.getFirstVisiblePosition());
        try {
            if (MusicUtils.sService != null
                    && which != MusicUtils.sService.getQueuePosition()) {
                mDeletedOneRow = true;
            }
        } catch (RemoteException e) {
            // Service died, so nothing playing.
            mDeletedOneRow = true;
        }
        v.setVisibility(View.GONE);
        mTrackList.invalidateViews();
        mTrackCursor.moveToPosition(which);
//        mTrackCursor.deleteRow();
//        mTrackCursor.commitUpdates();
        v.setVisibility(View.VISIBLE);
        mTrackList.invalidateViews();
    }
    
    private BroadcastReceiver mTrackListListener = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            getListView().invalidateViews();
        }
    };

    private BroadcastReceiver mNowPlayingListener = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equals(MediaPlaybackService.META_CHANGED)) {
                getListView().invalidateViews();
            } else if (intent.getAction().equals(MediaPlaybackService.QUEUE_CHANGED)) {
                if (mDeletedOneRow) {
                    // This is the notification for a single row that was
                    // deleted previously, which is already reflected in
                    // the UI.
                    mDeletedOneRow = false;
                    return;
                }
                mTrackCursor.close();
                mTrackCursor = new NowPlayingCursor(MusicUtils.sService, mCursorCols);
                if (mTrackCursor.getCount() == 0) {
                    finish();
                    return;
                }
                ((TrackListAdapter)getListAdapter()).changeCursor(mTrackCursor);
                getListView().invalidateViews();
            }
        }
    };
    
    public void onCreateContextMenu(ContextMenu menu, View view, ContextMenuInfo menuInfoIn) {
        menu.add(0, PLAY_SELECTION, 0, R.string.play_selection);
        SubMenu sub = menu.addSubMenu(0, ADD_TO_PLAYLIST, 0, R.string.add_to_playlist);
        MusicUtils.makePlaylistMenu(this, sub);
        if (mEditMode) {
            menu.add(0, REMOVE, 0, R.string.remove_from_playlist);
        }
        menu.add(0, USE_AS_RINGTONE, 0, R.string.ringtone_menu);
        menu.add(0, DELETE_ITEM, 0, R.string.delete_item);
        AdapterContextMenuInfo mi = (AdapterContextMenuInfo) menuInfoIn;
        mSelectedPosition =  mi.position;
        mTrackCursor.moveToPosition(mSelectedPosition);
        int id_idx = mTrackCursor.getColumnIndex(MediaStore.Audio.Playlists.Members.AUDIO_ID);
        if (id_idx < 0 ) {
            mSelectedId = mi.id;
        } else {
            mSelectedId = mTrackCursor.getInt(id_idx);
        }
        mCurrentTrackName = mTrackCursor.getString(mTrackCursor.getColumnIndex(MediaStore.Audio.Media.TITLE));
        menu.setHeaderTitle(mCurrentTrackName);
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case PLAY_SELECTION: {
                // play the track
                int position = mSelectedPosition;
                MusicUtils.playAll(this, mTrackCursor, position);
                return true;
            }

            case QUEUE: {
                int [] list = new int[] { (int) mSelectedId };
                MusicUtils.addToCurrentPlaylist(this, list);
                return true;
            }

            case NEW_PLAYLIST: {
                Intent intent = new Intent();
                intent.setClass(this, CreatePlaylist.class);
                startActivityForResult(intent, NEW_PLAYLIST);
                return true;
            }

            case PLAYLIST_SELECTED: {
                int [] list = new int[] { (int) mSelectedId };
                int playlist = item.getIntent().getIntExtra("playlist", 0);
                MusicUtils.addToPlaylist(this, list, playlist);
                return true;
            }

            case USE_AS_RINGTONE:
                // Set the system setting to make this the current ringtone
                MusicUtils.setRingtone(this, mSelectedId);
                return true;

            case DELETE_ITEM: {
                int [] list = new int[1];
                list[0] = (int) mSelectedId;
                Bundle b = new Bundle();
                b.putString("description", mCurrentTrackName);
                b.putIntArray("items", list);
                Intent intent = new Intent();
                intent.setClass(this, DeleteItems.class);
                intent.putExtras(b);
                startActivityForResult(intent, -1);
                return true;
            }
            
            case REMOVE:
                removePlaylistItem(mSelectedPosition);
                return true;
        }
        return super.onContextItemSelected(item);
    }

    // In order to use alt-up/down as a shortcut for moving the selected item
    // in the list, we need to override dispatchKeyEvent, not onKeyDown.
    // (onKeyDown never sees these events, since they are handled by the list)
    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        if (mPlaylist != null && event.getMetaState() != 0 /* && event.isDown() */) {
            switch (event.getKeyCode()) {
                case KeyEvent.KEYCODE_DPAD_UP:
                    moveItem(true);
                    return true;
                case KeyEvent.KEYCODE_DPAD_DOWN:
                    moveItem(false);
                    return true;
                case KeyEvent.KEYCODE_DEL:
                    removeItem();
                    return true;
            }
        }

        return super.dispatchKeyEvent(event);
    }

    private void removeItem() {
        int curcount = mTrackCursor.getCount();
        int curpos = mTrackList.getSelectedItemPosition();
        if (curcount == 0 || curpos < 0) {
            return;
        }
        
        if ("nowplaying".equals(mPlaylist)) {
            // remove track from queue

            // Work around bug 902971. To get quick visual feedback
            // of the deletion of the item, hide the selected view.
            try {
                if (curpos != MusicUtils.sService.getQueuePosition()) {
                    mDeletedOneRow = true;
                }
            } catch (RemoteException ex) {
            }
            View v = mTrackList.getSelectedView();
            v.setVisibility(View.GONE);
            mTrackList.invalidateViews();
            mTrackCursor.moveToPosition(curpos);
//            mTrackCursor.deleteRow();
//            mTrackCursor.commitUpdates();
            v.setVisibility(View.VISIBLE);
            mTrackList.invalidateViews();
        } else {
            // remove track from playlist
            mTrackCursor.moveToPosition(curpos);
//            mTrackCursor.deleteRow();
//            mTrackCursor.commitUpdates();
            curcount--;
            if (curcount == 0) {
                finish();
            } else {
                mTrackList.setSelection(curpos < curcount ? curpos : curcount);
            }
        }
    }
    
    private void moveItem(boolean up) {
        int curcount = mTrackCursor.getCount(); 
        int curpos = mTrackList.getSelectedItemPosition();
        if ( (up && curpos < 1) || (!up  && curpos >= curcount - 1)) {
            return;
        }

        if (mTrackCursor instanceof NowPlayingCursor) {
            NowPlayingCursor c = (NowPlayingCursor) mTrackCursor;
            c.moveItem(curpos, up ? curpos - 1 : curpos + 1);
            ((TrackListAdapter)getListAdapter()).notifyDataSetChanged();
            getListView().invalidateViews();
            mDeletedOneRow = true;
            if (up) {
                mTrackList.setSelection(curpos - 1);
            } else {
                mTrackList.setSelection(curpos + 1);
            }
        } else {
            int colidx = mTrackCursor.getColumnIndex(MediaStore.Audio.Playlists.Members.PLAY_ORDER);
            mTrackCursor.moveToPosition(curpos);
            int currentplayidx = mTrackCursor.getInt(colidx);
            if (up) {
//                    mTrackCursor.updateInt(colidx, currentplayidx - 1);
                    mTrackCursor.moveToPrevious();
            } else {
//                    mTrackCursor.updateInt(colidx, currentplayidx + 1);
                    mTrackCursor.moveToNext();
            }
//            mTrackCursor.updateInt(colidx, currentplayidx);
//            mTrackCursor.commitUpdates();
        }
    }
    
    @Override
    protected void onListItemClick(ListView l, View v, int position, long id)
    {
        if (mTrackCursor.getCount() == 0) {
            return;
        }
        MusicUtils.playAll(this, mTrackCursor, position);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        /* This activity is used for a number of different browsing modes, and the menu can
         * be different for each of them:
         * - all tracks, optionally restricted to an album, artist or playlist
         * - the list of currently playing songs
         */
        super.onCreateOptionsMenu(menu);
        if (mPlaylist == null) {
            menu.add(0, PLAY_ALL, 0, R.string.play_all).setIcon(R.drawable.ic_menu_play_clip);
        }
        menu.add(0, GOTO_START, 0, R.string.goto_start).setIcon(R.drawable.ic_menu_music_library);
        menu.add(0, GOTO_PLAYBACK, 0, R.string.goto_playback).setIcon(R.drawable.ic_menu_playback)
                .setVisible(MusicUtils.isMusicLoaded());
        menu.add(0, SHUFFLE_ALL, 0, R.string.shuffle_all).setIcon(R.drawable.ic_menu_shuffle);
        if (mPlaylist != null) {
            menu.add(0, SAVE_AS_PLAYLIST, 0, R.string.save_as_playlist).setIcon(R.drawable.ic_menu_save);
            if (mPlaylist.equals("nowplaying")) {
                menu.add(0, CLEAR_PLAYLIST, 0, R.string.clear_playlist).setIcon(R.drawable.ic_menu_clear_playlist);
            }
        }
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        Intent intent;
        Cursor cursor;
        switch (item.getItemId()) {
            case PLAY_ALL: {
                MusicUtils.playAll(this, mTrackCursor);
                return true;
            }

            case GOTO_START:
                intent = new Intent();
                intent.setClass(this, MusicBrowserActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(intent);
                return true;

            case GOTO_PLAYBACK:
                intent = new Intent("com.android.imusic.playing");
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(intent);
                return true;
                
            case SHUFFLE_ALL:
                // Should 'shuffle all' shuffle ALL, or only the tracks shown?
                cursor = MusicUtils.query(this, MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                        new String [] { MediaStore.Audio.Media._ID}, 
                        MediaStore.Audio.Media.IS_MUSIC + "=1", null,
                        MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
                if (cursor != null) {
                    MusicUtils.shuffleAll(this, cursor);
                    cursor.close();
                }
                return true;
                
            case SAVE_AS_PLAYLIST:
                intent = new Intent();
                intent.setClass(this, CreatePlaylist.class);
                startActivityForResult(intent, SAVE_AS_PLAYLIST);
                return true;
                
            case CLEAR_PLAYLIST:
                // We only clear the current playlist
                MusicUtils.clearQueue();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        switch (requestCode) {
            case SCAN_DONE:
                if (resultCode == RESULT_CANCELED) {
                    finish();
                } else {
                    init();
                }
                break;
                
            case NEW_PLAYLIST:
                if (resultCode == RESULT_OK) {
                    Uri uri = Uri.parse(intent.getAction());
                    if (uri != null) {
                        int [] list = new int[] { (int) mSelectedId };
                        MusicUtils.addToPlaylist(this, list, Integer.valueOf(uri.getLastPathSegment()));
                    }
                }
                break;

            case SAVE_AS_PLAYLIST:
                if (resultCode == RESULT_OK) {
                    Uri uri = Uri.parse(intent.getAction());
                    if (uri != null) {
                        int [] list = MusicUtils.getSongListForCursor(mTrackCursor);
                        int plid = Integer.parseInt(uri.getLastPathSegment());
                        MusicUtils.addToPlaylist(this, list, plid);
                    }
                }
                break;
        }
    }

    private Cursor getTrackCursor(String filterstring) {
        Cursor ret = null;
        mSortOrder = MediaStore.Audio.Media.TITLE_KEY;
        StringBuilder where = new StringBuilder();
        where.append(MediaStore.Audio.Media.TITLE + " != ''");
        
        // 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] = '%' + MediaStore.Audio.keyFor(searchWords[i]) + '%';
            }
            for (int i = 0; i < searchWords.length; i++) {
                where.append(" AND ");
                where.append(MediaStore.Audio.Media.ARTIST_KEY + "||");
                where.append(MediaStore.Audio.Media.ALBUM_KEY + "||");
                where.append(MediaStore.Audio.Media.TITLE_KEY + " LIKE ?");