使用Vitamio打造自己的Android万能播放器（11）—— 本地扫描后台服务
前言
Vitamio和OPlayer系列文章得到广大同行的关注和支持，非常感谢！离系列文章的上篇有几个月了，各种忙暂停了本系列文章，非常抱歉！离OPlayer正式上线还有距离，还有很多要做的事情，继续前行！
声明
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正文
一、注意事项
本章节使用的是Vitamio 3.0（2012-11-07）请大家及时更新。
注意3.0整合的适合建议使用Library方式整合Vitamio，否则需要反射或者使用OPlayer的方法，覆盖R（参见代码）。
二、主要代码：
/** 媒体扫描 */
public class MediaScannerService extends Service implements Runnable {
private static final String SERVICE_NAME = "com.nmbb.oplayer.service.MediaScannerService";
/** 扫描文件夹 */
public static final String EXTRA_DIRECTORY = "scan_directory";
/** 扫描文件 */
public static final String EXTRA_FILE_PATH = "scan_file";
public static final String EXTRA_MIME_TYPE = "mimetype";
public static final int SCAN_STATUS_NORMAL = -1;
/** 开始扫描 */
public static final int SCAN_STATUS_START = 0;
/** 正在扫描 扫描到一个视频文件 */
public static final int SCAN_STATUS_RUNNING = 1;
/** 扫描完成 */
public static final int SCAN_STATUS_END = 2;
/** */
private ArrayList<IMediaScannerObserver> observers = new ArrayList<IMediaScannerObserver>();
private ConcurrentHashMap<String, String> mScanMap = new ConcurrentHashMap<String, String>();
/** 当前状态 */
private volatile int mServiceStatus = SCAN_STATUS_NORMAL;
private DbHelper<POMedia> mDbHelper;
private Map<String, Object> mDbWhere = new HashMap<String, Object>(2);
@Override
public void onCreate() {
super.onCreate();
mDbHelper = new DbHelper<POMedia>();
}
/** 是否正在运行 */
public static boolean isRunning() {
ActivityManager manager = (ActivityManager) OPlayerApplication.getContext().getSystemService(Context.ACTIVITY_SERVICE);
for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
if (SERVICE_NAME.equals(service.service.getClassName()))
return true;
}
return false;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent != null)
parseIntent(intent);
return super.onStartCommand(intent, flags, startId);
}
/** 解析Intent */
private void parseIntent(final Intent intent) {
final Bundle arguments = intent.getExtras();
if (arguments != null) {
if (arguments.containsKey(EXTRA_DIRECTORY)) {
String directory = arguments.getString(EXTRA_DIRECTORY);
Logger.i("onStartCommand:" + directory);
//扫描文件夹
if (!mScanMap.containsKey(directory))
mScanMap.put(directory, "");
} else if (arguments.containsKey(EXTRA_FILE_PATH)) {
//单文件
String filePath = arguments.getString(EXTRA_FILE_PATH);
Logger.i("onStartCommand:" + filePath);
if (!StringUtils.isEmpty(filePath)) {
if (!mScanMap.containsKey(filePath))
mScanMap.put(filePath, arguments.getString(EXTRA_MIME_TYPE));
// scanFile(filePath, arguments.getString(EXTRA_MIME_TYPE));
}
}
}
if (mServiceStatus == SCAN_STATUS_NORMAL || mServiceStatus == SCAN_STATUS_END) {
new Thread(this).start();
//scan();
}
}
@Override
public void run() {
scan();
}
/** 扫描 */
private void scan() {
//开始扫描
notifyObservers(SCAN_STATUS_START, null);
while (mScanMap.keySet().size() > 0) {
String path = "";
for (String key : mScanMap.keySet()) {
path = key;
break;
}
if (mScanMap.containsKey(path)) {
String mimeType = mScanMap.get(path);
if ("".equals(mimeType)) {
scanDirectory(path);
} else {
scanFile(path, mimeType);
}
//扫描完成一个
mScanMap.remove(path);
}
//任务之间歇息一秒
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
Logger.e(e);
}
}
//全部扫描完成
notifyObservers(SCAN_STATUS_END, null);
//第一次扫描
OPreference pref = new OPreference(this);
if (pref.getBoolean(OPlayerApplication.PREF_KEY_FIRST, true))
pref.putBooleanAndCommit(OPlayerApplication.PREF_KEY_FIRST, false);
//停止服务
stopSelf();
}
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
for (IMediaScannerObserver s : observers) {
if (s != null) {
s.update(msg.what, (POMedia) msg.obj);
}
}
}
};
/** 扫描文件 */
private void scanFile(String path, String mimeType) {
save(new POMedia(path, mimeType));
}
/** 扫描文件夹 */
private void scanDirectory(String path) {
eachAllMedias(new File(path));
}
/** 递归查找视频 */
private void eachAllMedias(File f) {
if (f != null && f.exists() && f.isDirectory()) {
File[] files = f.listFiles();
if (files != null) {
for (File file : f.listFiles()) {
// Logger.i(f.getAbsolutePath());
if (file.isDirectory()) {
//忽略.开头的文件夹
if (!file.getAbsolutePath().startsWith("."))
eachAllMedias(file);
} else if (file.exists() && file.canRead() && FileUtils.isVideo(file)) {
save(new POMedia(file));
}
}
}
}
}
/**
* 保存入库
*
* @throws FileNotFoundException
*/
private void save(POMedia media) {
mDbWhere.put("path", media.path);
mDbWhere.put("last_modify_time", media.last_modify_time);
//检测
if (!mDbHelper.exists(media, mDbWhere)) {
try {
if (media.title != null && media.title.length() > 0)
media.title_key = PinyinUtils.chineneToSpell(media.title.charAt(0) + "");
} catch (Exception ex) {
Logger.e(ex);
}
media.last_access_time = System.currentTimeMillis();
//提取缩略图
// extractThumbnail(media);
media.mime_type = FileUtils.getMimeType(media.path);
//入库
mDbHelper.create(media);
//扫描到一个
notifyObservers(SCAN_STATUS_RUNNING, media);
}
}
/** 提取生成缩略图 */
private void extractThumbnail(POMedia media) {
final Context ctx = OPlayerApplication.getContext();
// ThumbnailUtils.
Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(ctx, media.path, ThumbnailUtils.MINI_KIND);
try {
if (bitmap == null) {
//缩略图创建失败
bitmap = Bitmap.createBitmap(ThumbnailUtils.TARGET_SIZE_MINI_THUMBNAIL_WIDTH, ThumbnailUtils.TARGET_SIZE_MINI_THUMBNAIL_HEIGHT, Bitmap.Config.RGB_565);
}
media.width = bitmap.getWidth();
media.height = bitmap.getHeight();
//缩略图
bitmap = ThumbnailUtils.extractThumbnail(bitmap, ConvertUtils.dipToPX(ctx, ThumbnailUtils.TARGET_SIZE_MICRO_THUMBNAIL_WIDTH), ConvertUtils.dipToPX(ctx, ThumbnailUtils.TARGET_SIZE_MICRO_THUMBNAIL_HEIGHT), ThumbnailUtils.OPTIONS_RECYCLE_INPUT);
if (bitmap != null) {
//将缩略图存到视频当前路径
File thum = new File(OPlayerApplication.OPLAYER_VIDEO_THUMB, UUID.randomUUID().toString());
media.thumb_path = thum.getAbsolutePath();
//thum.createNewFile();
FileOutputStream iStream = new FileOutputStream(thum);
bitmap.compress(Bitmap.CompressFormat.JPEG, 85, iStream);
iStream.close();
}
//入库
} catch (Exception ex) {
Logger.e(ex);
} finally {
if (bitmap != null)
bitmap.recycle();
}
}
// ~~~ 状态改变
/** 通知状态改变 */
private void notifyObservers(int flag, POMedia media) {
mHandler.sendMessage(mHandler.obtainMessage(flag, media));
}
/** 增加观察者 */
public void addObserver(IMediaScannerObserver s) {
synchronized (this) {
if (!observers.contains(s)) {
observers.add(s);
}
}
}
/** 删除观察者 */
public synchronized void deleteObserver(IMediaScannerObserver s) {
observers.remove(s);
}
/** 删除所有观察者 */
public synchronized void deleteObservers() {
observers.clear();
}
public interface IMediaScannerObserver {
/**
*
* @param flag 0 开始扫描 1 正在扫描 2 扫描完成
* @param file 扫描到的视频文件
*/
public void update(int flag, POMedia media);
}
// ~~~ Binder
private final MediaScannerServiceBinder mBinder = new MediaScannerServiceBinder();
public class MediaScannerServiceBinder extends Binder {
public MediaScannerService getService() {
return MediaScannerService.this;
}
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
}
public class MediaScannerService extends Service implements Runnable {
private static final String SERVICE_NAME = "com.nmbb.oplayer.service.MediaScannerService";
/** 扫描文件夹 */
public static final String EXTRA_DIRECTORY = "scan_directory";
/** 扫描文件 */
public static final String EXTRA_FILE_PATH = "scan_file";
public static final String EXTRA_MIME_TYPE = "mimetype";
public static final int SCAN_STATUS_NORMAL = -1;
/** 开始扫描 */
public static final int SCAN_STATUS_START = 0;
/** 正在扫描 扫描到一个视频文件 */
public static final int SCAN_STATUS_RUNNING = 1;
/** 扫描完成 */
public static final int SCAN_STATUS_END = 2;
/** */
private ArrayList<IMediaScannerObserver> observers = new ArrayList<IMediaScannerObserver>();
private ConcurrentHashMap<String, String> mScanMap = new ConcurrentHashMap<String, String>();
/** 当前状态 */
private volatile int mServiceStatus = SCAN_STATUS_NORMAL;
private DbHelper<POMedia> mDbHelper;
private Map<String, Object> mDbWhere = new HashMap<String, Object>(2);
@Override
public void onCreate() {
super.onCreate();
mDbHelper = new DbHelper<POMedia>();
}
/** 是否正在运行 */
public static boolean isRunning() {
ActivityManager manager = (ActivityManager) OPlayerApplication.getContext().getSystemService(Context.ACTIVITY_SERVICE);
for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
if (SERVICE_NAME.equals(service.service.getClassName()))
return true;
}
return false;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent != null)
parseIntent(intent);
return super.onStartCommand(intent, flags, startId);
}
/** 解析Intent */
private void parseIntent(final Intent intent) {
final Bundle arguments = intent.getExtras();
if (arguments != null) {
if (arguments.containsKey(EXTRA_DIRECTORY)) {
String directory = arguments.getString(EXTRA_DIRECTORY);
Logger.i("onStartCommand:" + directory);
//扫描文件夹
if (!mScanMap.containsKey(directory))
mScanMap.put(directory, "");
} else if (arguments.containsKey(EXTRA_FILE_PATH)) {
//单文件
String filePath = arguments.getString(EXTRA_FILE_PATH);
Logger.i("onStartCommand:" + filePath);
if (!StringUtils.isEmpty(filePath)) {
if (!mScanMap.containsKey(filePath))
mScanMap.put(filePath, arguments.getString(EXTRA_MIME_TYPE));
// scanFile(filePath, arguments.getString(EXTRA_MIME_TYPE));
}
}
}
if (mServiceStatus == SCAN_STATUS_NORMAL || mServiceStatus == SCAN_STATUS_END) {
new Thread(this).start();
//scan();
}
}
@Override
public void run() {
scan();
}
/** 扫描 */
private void scan() {
//开始扫描
notifyObservers(SCAN_STATUS_START, null);
while (mScanMap.keySet().size() > 0) {
String path = "";
for (String key : mScanMap.keySet()) {
path = key;
break;
}
if (mScanMap.containsKey(path)) {
String mimeType = mScanMap.get(path);
if ("".equals(mimeType)) {
scanDirectory(path);
} else {
scanFile(path, mimeType);
}
//扫描完成一个
mScanMap.remove(path);
}
//任务之间歇息一秒
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
Logger.e(e);
}
}
//全部扫描完成
notifyObservers(SCAN_STATUS_END, null);
//第一次扫描
OPreference pref = new OPreference(this);
if (pref.getBoolean(OPlayerApplication.PREF_KEY_FIRST, true))
pref.putBooleanAndCommit(OPlayerApplication.PREF_KEY_FIRST, false);
//停止服务
stopSelf();
}
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
for (IMediaScannerObserver s : observers) {
if (s != null) {
s.update(msg.what, (POMedia) msg.obj);
}
}
}
};
/** 扫描文件 */
private void scanFile(String path, String mimeType) {
save(new POMedia(path, mimeType));
}
/** 扫描文件夹 */
private void scanDirectory(String path) {
eachAllMedias(new File(path));
}
/** 递归查找视频 */
private void eachAllMedias(File f) {
if (f != null && f.exists() && f.isDirectory()) {
File[] files = f.listFiles();
if (files != null) {
for (File file : f.listFiles()) {
// Logger.i(f.getAbsolutePath());
if (file.isDirectory()) {
//忽略.开头的文件夹
if (!file.getAbsolutePath().startsWith("."))
eachAllMedias(file);
} else if (file.exists() && file.canRead() && FileUtils.isVideo(file)) {
save(new POMedia(file));
}
}
}
}
}
/**
* 保存入库
*
* @throws FileNotFoundException
*/
private void save(POMedia media) {
mDbWhere.put("path", media.path);
mDbWhere.put("last_modify_time", media.last_modify_time);
//检测
if (!mDbHelper.exists(media, mDbWhere)) {
try {
if (media.title != null && media.title.length() > 0)
media.title_key = PinyinUtils.chineneToSpell(media.title.charAt(0) + "");
} catch (Exception ex) {
Logger.e(ex);
}
media.last_access_time = System.currentTimeMillis();
//提取缩略图
// extractThumbnail(media);
media.mime_type = FileUtils.getMimeType(media.path);
//入库
mDbHelper.create(media);
//扫描到一个
notifyObservers(SCAN_STATUS_RUNNING, media);
}
}
/** 提取生成缩略图 */
private void extractThumbnail(POMedia media) {
final Context ctx = OPlayerApplication.getContext();
// ThumbnailUtils.
Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(ctx, media.path, ThumbnailUtils.MINI_KIND);
try {
if (bitmap == null) {
//缩略图创建失败
bitmap = Bitmap.createBitmap(ThumbnailUtils.TARGET_SIZE_MINI_THUMBNAIL_WIDTH, ThumbnailUtils.TARGET_SIZE_MINI_THUMBNAIL_HEIGHT, Bitmap.Config.RGB_565);
}
media.width = bitmap.getWidth();
media.height = bitmap.getHeight();
//缩略图
bitmap = ThumbnailUtils.extractThumbnail(bitmap, ConvertUtils.dipToPX(ctx, ThumbnailUtils.TARGET_SIZE_MICRO_THUMBNAIL_WIDTH), ConvertUtils.dipToPX(ctx, ThumbnailUtils.TARGET_SIZE_MICRO_THUMBNAIL_HEIGHT), ThumbnailUtils.OPTIONS_RECYCLE_INPUT);
if (bitmap != null) {
//将缩略图存到视频当前路径
File thum = new File(OPlayerApplication.OPLAYER_VIDEO_THUMB, UUID.randomUUID().toString());
media.thumb_path = thum.getAbsolutePath();
//thum.createNewFile();
FileOutputStream iStream = new FileOutputStream(thum);
bitmap.compress(Bitmap.CompressFormat.JPEG, 85, iStream);
iStream.close();
}
//入库
} catch (Exception ex) {
Logger.e(ex);
} finally {
if (bitmap != null)
bitmap.recycle();
}
}
// ~~~ 状态改变
/** 通知状态改变 */
private void notifyObservers(int flag, POMedia media) {
mHandler.sendMessage(mHandler.obtainMessage(flag, media));
}
/** 增加观察者 */
public void addObserver(IMediaScannerObserver s) {
synchronized (this) {
if (!observers.contains(s)) {
observers.add(s);
}
}
}
/** 删除观察者 */
public synchronized void deleteObserver(IMediaScannerObserver s) {
observers.remove(s);
}
/** 删除所有观察者 */
public synchronized void deleteObservers() {
observers.clear();
}
public interface IMediaScannerObserver {
/**
*
* @param flag 0 开始扫描 1 正在扫描 2 扫描完成
* @param file 扫描到的视频文件
*/
public void update(int flag, POMedia media);
}
// ~~~ Binder
private final MediaScannerServiceBinder mBinder = new MediaScannerServiceBinder();
public class MediaScannerServiceBinder extends Binder {
public MediaScannerService getService() {
return MediaScannerService.this;
}
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
}
代码说明：
1、默认Service是在主线程中运行的，扫描比较耗时，这里启用了一个新的线程。
2、使用了观察者模式来通知数据变化，没有用广播。
3、暂时去掉了截图，截图报错，还在修改。
三、OPlayer
3.1 下载请移步#Taocode（SVN）：(没有账户的请注册一个即可)
项目地址：http://code.taobao.org/p/oplayer
SVN地址：http://code.taobao.org/svn/oplayer/
3.2 更新
a). 数据库层使用了ormlite框架。
b). 将扫描视频文件修改为后台服务，单独起了一个线程。
c). 整合Vitamio 3.0，修改反射为覆盖io.voo.vitamio.R。
四、Vitamio
已建立Vitamio开发者联盟官方QQ群！群号为：246969281
注意：目前仅接受已经开发基于Vitamio产品的开发者申请加入，申请理由请填写产品的名称和链接！
官方微博：http://weibo.com/vitamio
五、八卦
想在这里澄清一下OPlayer与VPlayer、Vitamio的关系：
1、OPlayer这个项目是跟公司没有关系，纯属于个人业余爱好作品。
2、OPlayer使用的是Vitamio，但不会比大家优先获取Vitamio的新版本。
3、OPlayer非官方示例。
结束
更加深刻体会“坚持就是胜利”这句话的意义。
