应用源码之Music.zip

/* * Copyright (C) 2007 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.music; import android.app.Notification; import android.app.PendingIntent; import android.app.Service; import android.appwidget.AppWidgetManager; 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.IntentFilter; import android.content.BroadcastReceiver; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import android.database.Cursor; import android.database.sqlite.SQLiteException; import android.graphics.Bitmap; import android.media.audiofx.AudioEffect; import android.media.AudioManager; import android.media.AudioManager.OnAudioFocusChangeListener; import android.media.MediaMetadataRetriever; import android.media.MediaPlayer; import android.media.RemoteControlClient; import android.media.RemoteControlClient.MetadataEditor; import android.net.Uri; import android.os.Handler; import android.os.IBinder; import android.os.Message; import android.os.PowerManager; import android.os.SystemClock; import android.os.PowerManager.WakeLock; import android.provider.MediaStore; import android.util.Log; import android.widget.RemoteViews; import android.widget.Toast; import java.io.FileDescriptor; import java.io.IOException; import java.io.PrintWriter; import java.lang.ref.WeakReference; import java.util.Random; import java.util.Vector; /** * Provides "background" audio playback capabilities, allowing the * user to switch between activities without stopping playback. */ public class MediaPlaybackService extends Service { /** used to specify whether enqueue() should start playing * the new list of files right away, next or once all the currently * queued files have been played */ public static final int NOW = 1; public static final int NEXT = 2; public static final int LAST = 3; public static final int PLAYBACKSERVICE_STATUS = 1; public static final int SHUFFLE_NONE = 0; public static final int SHUFFLE_NORMAL = 1; public static final int SHUFFLE_AUTO = 2; public static final int REPEAT_NONE = 0; public static final int REPEAT_CURRENT = 1; public static final int REPEAT_ALL = 2; public static final String PLAYSTATE_CHANGED = "com.android.music.playstatechanged"; public static final String META_CHANGED = "com.android.music.metachanged"; public static final String QUEUE_CHANGED = "com.android.music.queuechanged"; public static final String SERVICECMD = "com.android.music.musicservicecommand"; public static final String CMDNAME = "command"; public static final String CMDTOGGLEPAUSE = "togglepause"; public static final String CMDSTOP = "stop"; public static final String CMDPAUSE = "pause"; public static final String CMDPLAY = "play"; public static final String CMDPREVIOUS = "previous"; public static final String CMDNEXT = "next"; public static final String TOGGLEPAUSE_ACTION = "com.android.music.musicservicecommand.togglepause"; public static final String PAUSE_ACTION = "com.android.music.musicservicecommand.pause"; public static final String PREVIOUS_ACTION = "com.android.music.musicservicecommand.previous"; public static final String NEXT_ACTION = "com.android.music.musicservicecommand.next"; private static final int TRACK_ENDED = 1; private static final int RELEASE_WAKELOCK = 2; private static final int SERVER_DIED = 3; private static final int FOCUSCHANGE = 4; private static final int FADEDOWN = 5; private static final int FADEUP = 6; private static final int MAX_HISTORY_SIZE = 100; private MultiPlayer mPlayer; private String mFileToPlay; private int mShuffleMode = SHUFFLE_NONE; private int mRepeatMode = REPEAT_NONE; private int mMediaMountedCount = 0; private long [] mAutoShuffleList = null; private long [] mPlayList = null; private int mPlayListLen = 0; private Vector<Integer> mHistory = new Vector<Integer>(MAX_HISTORY_SIZE); private Cursor mCursor; private int mPlayPos = -1; private static final String LOGTAG = "MediaPlaybackService"; private final Shuffler mRand = new Shuffler(); private int mOpenFailedCounter = 0; String[] mCursorCols = new String[] { "audio._id AS _id", // index must match IDCOLIDX below MediaStore.Audio.Media.ARTIST, MediaStore.Audio.Media.ALBUM, MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.DATA, MediaStore.Audio.Media.MIME_TYPE, MediaStore.Audio.Media.ALBUM_ID, MediaStore.Audio.Media.ARTIST_ID, MediaStore.Audio.Media.IS_PODCAST, // index must match PODCASTCOLIDX below MediaStore.Audio.Media.BOOKMARK // index must match BOOKMARKCOLIDX below }; private final static int IDCOLIDX = 0; private final static int PODCASTCOLIDX = 8; private final static int BOOKMARKCOLIDX = 9; private BroadcastReceiver mUnmountReceiver = null; private WakeLock mWakeLock; private int mServiceStartId = -1; private boolean mServiceInUse = false; private boolean mIsSupposedToBePlaying = false; private boolean mQuietMode = false; private AudioManager mAudioManager; private boolean mQueueIsSaveable = true; // used to track what type of audio focus loss caused the playback to pause private boolean mPausedByTransientLossOfFocus = false; private SharedPreferences mPreferences; // We use this to distinguish between different cards when saving/restoring playlists. // This will have to change if we want to support multiple simultaneous cards. private int mCardId; private MediaAppWidgetProvider mAppWidgetProvider = MediaAppWidgetProvider.getInstance(); // interval after which we stop the service when idle private static final int IDLE_DELAY = 60000; private RemoteControlClient mRemoteControlClient; private Handler mMediaplayerHandler = new Handler() { float mCurrentVolume = 1.0f; @Override public void handleMessage(Message msg) { MusicUtils.debugLog("mMediaplayerHandler.handleMessage " + msg.what); switch (msg.what) { case FADEDOWN: mCurrentVolume -= .05f; if (mCurrentVolume > .2f) { mMediaplayerHandler.sendEmptyMessageDelayed(FADEDOWN, 10); } else { mCurrentVolume = .2f; } mPlayer.setVolume(mCurrentVolume); break; case FADEUP: mCurrentVolume += .01f; if (mCurrentVolume < 1.0f) { mMediaplayerHandler.sendEmptyMessageDelayed(FADEUP, 10); } else { mCurrentVolume = 1.0f; } mPlayer.setVolume(mCurrentVolume); break; case SERVER_DIED: if (mIsSupposedToBePlaying) { next(true); } else { // the server died when we were idle, so just // r