musicutils.java

Android平台上的media player, iPhone风格

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.imusic;

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Formatter;
import java.util.HashMap;
import java.util.Locale;

import android.app.Activity;
import android.app.ExpandableListActivity;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.res.Resources;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.PixelFormat;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.media.MediaFile;
//import android.media.MediaScanner;
import android.net.Uri;
import android.os.RemoteException;
import android.os.Environment;
import android.os.ParcelFileDescriptor;
import android.provider.MediaStore;
import android.provider.Settings;
import android.util.Log;
import android.view.SubMenu;
import android.view.Window;
import android.widget.TextView;
import android.widget.Toast;

public class MusicUtils {

    private static final String TAG = "MusicUtils";

    public interface Defs {
        public final static int OPEN_URL = 0;
        public final static int ADD_TO_PLAYLIST = 1;
        public final static int USE_AS_RINGTONE = 2;
        public final static int PLAYLIST_SELECTED = 3;
        public final static int NEW_PLAYLIST = 4;
        public final static int PLAY_SELECTION = 5;
        public final static int GOTO_START = 6;
        public final static int GOTO_PLAYBACK = 7;
        public final static int PARTY_SHUFFLE = 8;
        public final static int SHUFFLE_ALL = 9;
        public final static int DELETE_ITEM = 10;
        public final static int SCAN_DONE = 11;
        public final static int CHILD_MENU_BASE = 12;
        public final static int QUEUE = 13;
    }
    
    public static String makeAlbumsSongsLabel(Context context, int numalbums, int numsongs, boolean isUnknown) {
        // There are several formats for the albums/songs information:
        // "1 Song"   - used if there is only 1 song
        // "N Songs" - used for the "unknown artist" item
        // "1 Album"/"N Songs" 
        // "N Album"/"M Songs"
        // Depending on locale, these may need to be further subdivided
        
        StringBuilder songs_albums = new StringBuilder();

        if (numsongs == 1) {
            songs_albums.append(context.getString(R.string.onesong));
        } else {
            Resources r = context.getResources();
            if (! isUnknown) {
                String f = r.getQuantityText(R.plurals.Nalbums, numalbums).toString();
                sFormatBuilder.setLength(0);
                sFormatter.format(f, Integer.valueOf(numalbums));
                songs_albums.append(sFormatBuilder);
                songs_albums.append(context.getString(R.string.albumsongseparator));
            }
            String f = r.getQuantityText(R.plurals.Nsongs, numsongs).toString();
            sFormatBuilder.setLength(0);
            sFormatter.format(f, Integer.valueOf(numsongs));
            songs_albums.append(sFormatBuilder);
        }
        return songs_albums.toString();
    }
    
    public static IMediaPlaybackService sService = null;
    private static HashMap<Context, ServiceBinder> sConnectionMap = new HashMap<Context, ServiceBinder>();

    public static boolean bindToService(Context context) {
        return bindToService(context, null);
    }

    public static boolean bindToService(Context context, ServiceConnection callback) {
        context.startService(new Intent(context, MediaPlaybackService.class));
        ServiceBinder sb = new ServiceBinder(callback);
        sConnectionMap.put(context, sb);
        return context.bindService((new Intent()).setClass(context,
                MediaPlaybackService.class), sb, 0);
    }
    
    public static void unbindFromService(Context context) {
        ServiceBinder sb = (ServiceBinder) sConnectionMap.remove(context);
        if (sb == null) {
            Log.e("MusicUtils", "Trying to unbind for unknown Context");
            return;
        }
        context.unbindService(sb);
    }

    private static class ServiceBinder implements ServiceConnection {
        ServiceConnection mCallback;
        ServiceBinder(ServiceConnection callback) {
            mCallback = callback;
        }
        
        public void onServiceConnected(ComponentName className, android.os.IBinder service) {
            sService = IMediaPlaybackService.Stub.asInterface(service);
            initAlbumArtCache();
            if (mCallback != null) {
                mCallback.onServiceConnected(className, service);
            }
        }
        
        public void onServiceDisconnected(ComponentName className) {
            if (mCallback != null) {
                mCallback.onServiceDisconnected(className);
            }
            sService = null;
        }
    }
    
    public static int getCurrentAlbumId() {
        if (sService != null) {
            try {
                return sService.getAlbumId();
            } catch (RemoteException ex) {
            }
        }
        return -1;
    }

    public static int getCurrentArtistId() {
        if (MusicUtils.sService != null) {
            try {
                return sService.getArtistId();
            } catch (RemoteException ex) {
            }
        }
        return -1;
    }

    public static int getCurrentAudioId() {
        if (MusicUtils.sService != null) {
            try {
                return sService.getAudioId();
            } catch (RemoteException ex) {
            }
        }
        return -1;
    }
    
    public static int getCurrentShuffleMode() {
        int mode = MediaPlaybackService.SHUFFLE_NONE;
        if (sService != null) {
            try {
                mode = sService.getShuffleMode();
            } catch (RemoteException ex) {
            }
        }
        return mode;
    }
    
    /*
     * Returns true if a file is currently opened for playback (regardless
     * of whether it's playing or paused).
     */
    public static boolean isMusicLoaded() {
        if (MusicUtils.sService != null) {
            try {
                return sService.getPath() != null;
            } catch (RemoteException ex) {
            }
        }
        return false;
    }

    private final static int [] sEmptyList = new int[0];
    
    public static int [] getSongListForCursor(Cursor cursor) {
        if (cursor == null) {
            return sEmptyList;
        }
        int len = cursor.getCount();
        int [] list = new int[len];
        cursor.moveToFirst();
        int colidx = cursor.getColumnIndex(MediaStore.Audio.Playlists.Members.AUDIO_ID);
        if (colidx < 0) {
            colidx = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media._ID);
        }
        for (int i = 0; i < len; i++) {
            list[i] = cursor.getInt(colidx);
            cursor.moveToNext();
        }
        return list;
    }

    public static int [] getSongListForArtist(Context context, int id) {
        final String[] ccols = new String[] { MediaStore.Audio.Media._ID };
        String where = MediaStore.Audio.Media.ARTIST_ID + "=" + id + " AND " + 
        MediaStore.Audio.Media.IS_MUSIC + "=1";
        Cursor cursor = query(context, MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                ccols, where, null,
                MediaStore.Audio.Media.ALBUM_KEY + ","  + MediaStore.Audio.Media.TRACK);
        
        if (cursor != null) {
            int [] list = getSongListForCursor(cursor);
            cursor.close();
            return list;
        }
        return sEmptyList;
    }

    public static int [] getSongListForAlbum(Context context, int id) {
        final String[] ccols = new String[] { MediaStore.Audio.Media._ID };
        String where = MediaStore.Audio.Media.ALBUM_ID + "=" + id + " AND " + 
                MediaStore.Audio.Media.IS_MUSIC + "=1";
        Cursor cursor = query(context, MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                ccols, where, null, MediaStore.Audio.Media.TRACK);

        if (cursor != null) {
            int [] list = getSongListForCursor(cursor);
            cursor.close();
            return list;
        }
        return sEmptyList;
    }

    public static int [] getSongListForPlaylist(Context context, long plid) {
        final String[] ccols = new String[] { MediaStore.Audio.Playlists.Members.AUDIO_ID };
        Cursor cursor = query(context, MediaStore.Audio.Playlists.Members.getContentUri("external", plid),
                ccols, null, null, MediaStore.Audio.Playlists.Members.DEFAULT_SORT_ORDER);
        
        if (cursor != null) {
            int [] list = getSongListForCursor(cursor);
            cursor.close();
            return list;
        }
        return sEmptyList;
    }
    
    public static void playPlaylist(Context context, long plid) {
        int [] list = getSongListForPlaylist(context, plid);
        if (list != null) {
            playAll(context, list, -1, false);
        }
    }

    public static int [] getAllSongs(Context context) {
        Cursor c = query(context, MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                new String[] {MediaStore.Audio.Media._ID}, MediaStore.Audio.Media.IS_MUSIC + "=1",
                null, null);
        try {
            if (c == null || c.getCount() == 0) {
                return null;
            }
            int len = c.getCount();
            int[] list = new int[len];
            for (int i = 0; i < len; i++) {
                c.moveToNext();
                list[i] = c.getInt(0);
            }

            return list;
        } finally {
            if (c != null) {
                c.close();
            }
        }
    }

    /**
     * Fills out the given submenu with items for "new playlist" and
     * any existing playlists. When the user selects an item, the
     * application will receive PLAYLIST_SELECTED with the Uri of
     * the selected playlist, NEW_PLAYLIST if a new playlist
     * should be created, and QUEUE if the "current playlist" was
     * selected.
     * @param context The context to use for creating the menu items
     * @param sub The submenu to add the items to.
     */
    public static void makePlaylistMenu(Context context, SubMenu sub) {
        String[] cols = new String[] {
                MediaStore.Audio.Playlists._ID,
                MediaStore.Audio.Playlists.NAME
        };
        ContentResolver resolver = context.getContentResolver();
        if (resolver == null) {
            System.out.println("resolver = null");
        } else {
            String whereclause = MediaStore.Audio.Playlists.NAME + " != ''";
            Cursor cur = resolver.query(MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI,
                cols, whereclause, null,
                MediaStore.Audio.Playlists.NAME);
            sub.clear();
            sub.add(1, Defs.QUEUE, 0, R.string.queue);
            sub.add(1, Defs.NEW_PLAYLIST, 0, R.string.new_playlist);
            if (cur != null && cur.getCount() > 0) {
                //sub.addSeparator(1, 0);
                cur.moveToFirst();
                while (! cur.isAfterLast()) {
                    Intent intent = new Intent();
                    intent.putExtra("playlist", cur.getInt(0));
//                    if (cur.getInt(0) == mLastPlaylistSelected) {
//                        sub.add(0, MusicBaseActivity.PLAYLIST_SELECTED, cur.getString(1)).setIntent(intent);
//                    } else {
                        sub.add(1, Defs.PLAYLIST_SELECTED, 0, cur.getString(1)).setIntent(intent);
//                    }
                    cur.moveToNext();
                }
            }
            if (cur != null) {
                cur.close();
            }
        }
    }

    public static void clearPlaylist(Context context, int plid) {
        final String[] ccols = new String[] { MediaStore.Audio.Playlists.Members._ID };
        Cursor cursor = query(context, MediaStore.Audio.Playlists.Members.getContentUri("external", plid),
                ccols, null, null, MediaStore.Audio.Playlists.Members.DEFAULT_SORT_ORDER);
        
        if (cursor == null) {
            return;
        }
        cursor.moveToFirst();
//        while (!cursor.isAfterLast()) {
//            cursor.deleteRow();
//        }
//        cursor.commitUpdates();
        cursor.close();
        return;
    }
    
    public static void deleteTracks(Context context, int [] list) {
        
        String [] cols = new String [] { MediaStore.Audio.Media._ID,