來源：https://developer.android.com/reference/android/media/MediaPlayer

MediaPlayer

public class MediaPlayer 
extends Object implements VolumeAutomation, AudioRouting

MediaPlayer class can be used to control playback of audio/video files and streams. An example on how to use the methods in this class can be found in 

Topics covered here are:

1. State Diagram
2. Valid and Invalid States
3. Permissions
4. Register informational and error callbacks

Developer Guides

For more information about how to use MediaPlayer, read the Media Playback developer guide.

State Diagram

Playback control of audio/video files and streams is managed as a state machine. The following diagram shows the life cycle and the states of a MediaPlayer object driven by the supported playback control operations. The ovals represent the states a MediaPlayer object may reside in. The arcs represent the playback control operations that drive the object state transition. There are two types of arcs. The arcs with a single arrow head represent synchronous method calls, while those with a double arrow head represent asynchronous method calls.

From this state diagram, one can see that a MediaPlayer object has the following states:

• When a MediaPlayer object is just created using new or after reset() is called, it is in the Idle state; and afterrelease() is called, it is in the End state. Between these two states is the life cycle of the MediaPlayer object.
  • There is a subtle but important difference between a newly constructed MediaPlayer object and the MediaPlayer object after 
    reset() is called. It is a programming error to invoke methods such as getCurrentPosition(), getDuration(), getVideoHeight(), getVideoWidth(), setAudioAttributes(AudioAttributes), setLooping(boolean), setVolume(float, float), pause(), start(), stop(), seekTo(long, int), prepare() or prepareAsync() in the Idle state for both cases. If any of these methods is called right after a MediaPlayer object is constructed, the user supplied callback method OnErrorListener.onError() won't be called by the internal player engine and the object state remains unchanged; but if these methods are called right after reset(), the user supplied callback method OnErrorListener.onError() will be invoked by the internal player engine and the object will be transfered to the Error state.
  • It is also recommended that once a MediaPlayer object is no longer being used, call release() immediately so that resources used by the internal player engine associated with the MediaPlayer object can be released immediately. Resource may include singleton resources such as hardware acceleration components and failure to call release() may cause subsequent instances of MediaPlayer objects to fallback to software implementations or fail altogether. Once the MediaPlayer object is in the End state, it can no longer be used and there is no way to bring it back to any other state.
  • Furthermore, the MediaPlayer objects created using new is in the Idle state, while those created with one of the overloaded convenient create methods are NOT in the Idle state. In fact, the objects are in the Preparedstate if the creation using create method is successful.
• In general, some playback control operation may fail due to various reasons, such as unsupported audio/video format, poorly interleaved audio/video, resolution too high, streaming timeout, and the like. Thus, error reporting and recovery is an important concern under these circumstances. Sometimes, due to programming errors, invoking a playback control operation in an invalid state may also occur. Under all these error conditions, the internal player engine invokes a user supplied OnErrorListener.onError() method if an OnErrorListener has been registered beforehand via setOnErrorListener(android.media.MediaPlayer.OnErrorListener).
  • It is important to note that once an error occurs, the MediaPlayer object enters the Error state (except as noted above), even if an error listener has not been registered by the application.
  • In order to reuse a MediaPlayer object that is in the Error state and recover from the error, reset() can be called to restore the object to its Idle state.
  • It is good programming practice to have your application register a OnErrorListener to look out for error notifications from the internal player engine.
  • IllegalStateException is thrown to prevent programming errors such as calling prepare(),prepareAsync(), or one of the overloaded setDataSource methods in an invalid state.
• Calling setDataSource(FileDescriptor), or setDataSource(String), or setDataSource(Context, Uri), orsetDataSource(FileDescriptor, long, long), or setDataSource(MediaDataSource) transfers a MediaPlayer object in the Idle state to the Initialized state.
  • An IllegalStateException is thrown if setDataSource() is called in any other state.
  • It is good programming practice to always look out for IllegalArgumentException and IOException that may be thrown from the overloaded setDataSource methods.
• A MediaPlayer object must first enter the Prepared state before playback can be started.
  • There are two ways (synchronous vs. asynchronous) that the Prepared state can be reached: either a call to prepare() (synchronous) which transfers the object to the Prepared state once the method call returns, or a call to prepareAsync() (asynchronous) which first transfers the object to the Preparing state after the call returns (which occurs almost right away) while the internal player engine continues working on the rest of preparation work until the preparation work completes. When the preparation completes or when prepare()call returns, the internal player engine then calls a user supplied callback method, onPrepared() of the OnPreparedListener interface, if an OnPreparedListener is registered beforehand via setOnPreparedListener(android.media.MediaPlayer.OnPreparedListener).
  • It is important to note that the Preparing state is a transient state, and the behavior of calling any method with side effect while a MediaPlayer object is in the Preparing state is undefined.
  • An IllegalStateException is thrown if prepare() or prepareAsync() is called in any other state.
  • While in the Prepared state, properties such as audio/sound volume, screenOnWhilePlaying, looping can be adjusted by invoking the corresponding set methods.
• To start the playback, start() must be called. After start() returns successfully, the MediaPlayer object is in the Started state. isPlaying() can be called to test whether the MediaPlayer object is in the Started state.
  • While in the Started state, the internal player engine calls a user supplied OnBufferingUpdateListener.onBufferingUpdate() callback method if a OnBufferingUpdateListener has been registered beforehand via setOnBufferingUpdateListener(OnBufferingUpdateListener). This callback allows applications to keep track of the buffering status while streaming audio/video.
  • Calling start() has not effect on a MediaPlayer object that is already in the Started state.
• Playback can be paused and stopped, and the current playback position can be adjusted. Playback can be paused via pause(). When the call to pause() returns, the MediaPlayer object enters the Paused state. Note that the transition from the Started state to the Paused state and vice versa happens asynchronously in the player engine. It may take some time before the state is updated in calls to isPlaying(), and it can be a number of seconds in the case of streamed content.
  • Calling start() to resume playback for a paused MediaPlayer object, and the resumed playback position is the same as where it was paused. When the call to start() returns, the paused MediaPlayer object goes back to the Started state.
  • Calling pause() has no effect on a MediaPlayer object that is already in the Paused state.
• Calling stop() stops playback and causes a MediaPlayer in the Started, Paused, Prepared or PlaybackCompletedstate to enter the Stopped state.
  • Once in the Stopped state, playback cannot be started until prepare() or prepareAsync() are called to set the MediaPlayer object to the Prepared state again.
  • Calling stop() has no effect on a MediaPlayer object that is already in the Stopped state.
• The playback position can be adjusted with a call to seekTo(long, int).
  • Although the asynchronuous seekTo(long, int) call returns right away, the actual seek operation may take a while to finish, especially for audio/video being streamed. When the actual seek operation completes, the internal player engine calls a user supplied OnSeekComplete.onSeekComplete() if an OnSeekCompleteListener has been registered beforehand viasetOnSeekCompleteListener(OnSeekCompleteListener).
  • Please note that seekTo(long, int) can also be called in the other states, such as Prepared, Paused and PlaybackCompleted state. When seekTo(long, int) is called in those states, one video frame will be displayed if the stream has video and the requested position is valid.
  • Furthermore, the actual current playback position can be retrieved with a call to getCurrentPosition(), which is helpful for applications such as a Music player that need to keep track of the playback progress.
• When the playback reaches the end of stream, the playback completes.
  • If the looping mode was being set to truewith setLooping(boolean), the MediaPlayer object shall remain in the Started state.
  • If the looping mode was set to false , the player engine calls a user supplied callback method, OnCompletion.onCompletion(), if a OnCompletionListener is registered beforehand via setOnCompletionListener(OnCompletionListener). The invoke of the callback signals that the object is now in the PlaybackCompleted state.
  • While in the PlaybackCompleted state, calling start() can restart the playback from the beginning of the audio/video source.

  Valid and invalid states

  Method Name	Valid States	Invalid States	Comments
  attachAuxEffect	{Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}	{Idle, Error}	This method must be called after setDataSource. Calling it does not change the object state.
  getAudioSessionId	any	{}	This method can be called in any state and calling it does not change the object state.
  getCurrentPosition	{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}	{Error}	Successful invoke of this method in a valid state does not change the state. Calling this method in an invalid state transfers the object to the Errorstate.
  getDuration	{Prepared, Started, Paused, Stopped, PlaybackCompleted}	{Idle, Initialized, Error}	Successful invoke of this method in a valid state does not change the state. Calling this method in an invalid state transfers the object to the Errorstate.
  getVideoHeight	{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}	{Error}	Successful invoke of this method in a valid state does not change the state. Calling this method in an invalid state transfers the object to the Errorstate.
  getVideoWidth	{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}	{Error}	Successful invoke of this method in a valid state does not change the state. Calling this method in an invalid state transfers the object to the Errorstate.
  isPlaying	{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}	{Error}	Successful invoke of this method in a valid state does not change the state. Calling this method in an invalid state transfers the object to the Errorstate.
  pause	{Started, Paused, PlaybackCompleted}	{Idle, Initialized, Prepared, Stopped, Error}	Successful invoke of this method in a valid state transfers the object to the Paused state. Calling this method in an invalid state transfers the object to the Error state.
  prepare	{Initialized, Stopped}	{Idle, Prepared, Started, Paused, PlaybackCompleted, Error}	Successful invoke of this method in a valid state transfers the object to the Prepared state. Calling this method in an invalid state throws an IllegalStateException.
  prepareAsync	{Initialized, Stopped}	{Idle, Prepared, Started, Paused, PlaybackCompleted, Error}	Successful invoke of this method in a valid state transfers the object to the Preparing state. Calling this method in an invalid state throws an IllegalStateException.
  release	any	{}	After release(), the object is no longer available.
  reset	{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted, Error}	{}	After reset(), the object is like being just created.
  seekTo	{Prepared, Started, Paused, PlaybackCompleted}	{Idle, Initialized, Stopped, Error}	Successful invoke of this method in a valid state does not change the state. Calling this method in an invalid state transfers the object to the Errorstate.
  setAudioAttributes	{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}	{Error}	Successful invoke of this method does not change the state. In order for the target audio attributes type to become effective, this method must be called before prepare() or prepareAsync().
  setAudioSessionId	{Idle}	{Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted, Error}	This method must be called in idle state as the audio session ID must be known before calling setDataSource. Calling it does not change the object state.
  setAudioStreamType (deprecated)	{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}	{Error}	Successful invoke of this method does not change the state. In order for the target audio stream type to become effective, this method must be called before prepare() or prepareAsync().
  setAuxEffectSendLevel	any	{}	Calling this method does not change the object state.
  setDataSource	{Idle}	{Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted, Error}	Successful invoke of this method in a valid state transfers the object to the Initialized state. Calling this method in an invalid state throws an IllegalStateException.
  setDisplay	any	{}	This method can be called in any state and calling it does not change the object state.
  setSurface	any	{}	This method can be called in any state and calling it does not change the object state.
  setVideoScalingMode	{Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}	{Idle, Error}	Successful invoke of this method does not change the state.
  setLooping	{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}	{Error}	Successful invoke of this method in a valid state does not change the state. Calling this method in an invalid state transfers the object to the Errorstate.
  isLooping	any	{}	This method can be called in any state and calling it does not change the object state.
  setOnBufferingUpdateListener	any	{}	This method can be called in any state and calling it does not change the object state.
  setOnCompletionListener	any	{}	This method can be called in any state and calling it does not change the object state.
  setOnErrorListener	any	{}	This method can be called in any state and calling it does not change the object state.
  setOnPreparedListener	any	{}	This method can be called in any state and calling it does not change the object state.
  setOnSeekCompleteListener	any	{}	This method can be called in any state and calling it does not change the object state.
  setPlaybackParams	{Initialized, Prepared, Started, Paused, PlaybackCompleted, Error}	{Idle, Stopped}	This method will change state in some cases, depending on when it's called.
  setScreenOnWhilePlaying	any	{}	This method can be called in any state and calling it does not change the object state.
  setVolume	{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}	{Error}	Successful invoke of this method does not change the state.
  setWakeMode	any	{}	This method can be called in any state and calling it does not change the object state.
  start	{Prepared, Started, Paused, PlaybackCompleted}	{Idle, Initialized, Stopped, Error}	Successful invoke of this method in a valid state transfers the object to the Started state. Calling this method in an invalid state transfers the object to the Error state.
  stop	{Prepared, Started, Stopped, Paused, PlaybackCompleted}	{Idle, Initialized, Error}	Successful invoke of this method in a valid state transfers the object to the Stopped state. Calling this method in an invalid state transfers the object to the Error state.
  getTrackInfo	{Prepared, Started, Stopped, Paused, PlaybackCompleted}	{Idle, Initialized, Error}	Successful invoke of this method does not change the state.
  addTimedTextSource	{Prepared, Started, Stopped, Paused, PlaybackCompleted}	{Idle, Initialized, Error}	Successful invoke of this method does not change the state.
  selectTrack	{Prepared, Started, Stopped, Paused, PlaybackCompleted}	{Idle, Initialized, Error}	Successful invoke of this method does not change the state.
  deselectTrack	{Prepared, Started, Stopped, Paused, PlaybackCompleted}	{Idle, Initialized, Error}	Successful invoke of this method does not change the state.

  Permissions

  One may need to declare a corresponding WAKE_LOCK permission <uses-permission> element.

  This class requires the Manifest.permission.INTERNET permission when used with network-based content.

  Callbacks

  Applications may want to register for informational and error events in order to be informed of some internal state update and possible runtime errors during playback or streaming. Registration for these events is done by properly setting the appropriate listeners (via calls tosetOnPreparedListener(OnPreparedListener)setOnPreparedListener,setOnVideoSizeChangedListener(OnVideoSizeChangedListener)setOnVideoSizeChangedListener,setOnSeekCompleteListener(OnSeekCompleteListener)setOnSeekCompleteListener,setOnCompletionListener(OnCompletionListener)setOnCompletionListener,setOnBufferingUpdateListener(OnBufferingUpdateListener)setOnBufferingUpdateListener,setOnInfoListener(OnInfoListener)setOnInfoListener,setOnErrorListener(OnErrorListener)setOnErrorListener, etc). In order to receive the respective callback associated with these listeners, applications are required to create MediaPlayer objects on a thread with its own Looper running (main UI thread by default has a Looper running).

  Summary

  Nested classes
  class	MediaPlayer.DrmInfo Encapsulates the DRM properties of the source.
  class	MediaPlayer.MetricsConstants
  class	MediaPlayer.NoDrmSchemeException Thrown when a DRM method is called before preparing a DRM scheme through prepareDrm().
  interface	MediaPlayer.OnBufferingUpdateListener Interface definition of a callback to be invoked indicating buffering status of a media resource being streamed over the network.
  interface	MediaPlayer.OnCompletionListener Interface definition for a callback to be invoked when playback of a media source has completed.
  interface	MediaPlayer.OnDrmConfigHelper Interface definition of a callback to be invoked when the app can do DRM configuration (get/set properties) before the session is opened.
  interface	MediaPlayer.OnDrmInfoListener Interface definition of a callback to be invoked when the DRM info becomes available
  interface	MediaPlayer.OnDrmPreparedListener Interface definition of a callback to notify the app when the DRM is ready for key request/response
  interface	MediaPlayer.OnErrorListener Interface definition of a callback to be invoked when there has been an error during an asynchronous operation (other errors will throw exceptions at method call time).
  interface	MediaPlayer.OnInfoListener Interface definition of a callback to be invoked to communicate some info and/or warning about the media or its playback.
  interface	MediaPlayer.OnMediaTimeDiscontinuityListener Interface definition of a callback to be invoked when discontinuity in the normal progression of the media time is detected.
  interface	MediaPlayer.OnPreparedListener Interface definition for a callback to be invoked when the media source is ready for playback.
  interface	MediaPlayer.OnSeekCompleteListener Interface definition of a callback to be invoked indicating the completion of a seek operation.
  interface	MediaPlayer.OnSubtitleDataListener Interface definition of a callback to be invoked when a player subtitle track has new subtitle data available.
  interface	MediaPlayer.OnTimedMetaDataAvailableListener Interface definition of a callback to be invoked when a track has timed metadata available.
  interface	MediaPlayer.OnTimedTextListener Interface definition of a callback to be invoked when a timed text is available for display.
  interface	MediaPlayer.OnVideoSizeChangedListener Interface definition of a callback to be invoked when the video size is first known or updated
  class	MediaPlayer.ProvisioningNetworkErrorException Thrown when the device requires DRM provisioning but the provisioning attempt has failed due to a network error (Internet reachability, timeout, etc.).
  class	MediaPlayer.ProvisioningServerErrorException Thrown when the device requires DRM provisioning but the provisioning attempt has failed due to the provisioning server denying the request.
  class	MediaPlayer.TrackInfo Class for MediaPlayer to return each audio/video/subtitle track's metadata.

  Constants
  int	MEDIA_ERROR_IO File or network related operation errors.
  int	MEDIA_ERROR_MALFORMED Bitstream is not conforming to the related coding standard or file spec.
  int	MEDIA_ERROR_NOT_VALID_FOR_PROGRESSIVE_PLAYBACK The video is streamed and its container is not valid for progressive playback i.e the video's index (e.g moov atom) is not at the start of the file.
  int	MEDIA_ERROR_SERVER_DIED Media server died.
  int	MEDIA_ERROR_TIMED_OUT Some operation takes too long to complete, usually more than 3-5 seconds.
  int	MEDIA_ERROR_UNKNOWN Unspecified media player error.
  int	MEDIA_ERROR_UNSUPPORTED Bitstream is conforming to the related coding standard or file spec, but the media framework does not support the feature.
  int	MEDIA_INFO_AUDIO_NOT_PLAYING Informs that audio is not playing.
  int	MEDIA_INFO_BAD_INTERLEAVING Bad interleaving means that a media has been improperly interleaved or not interleaved at all, e.g has all the video samples first then all the audio ones.
  int	MEDIA_INFO_BUFFERING_END MediaPlayer is resuming playback after filling buffers.
  int	MEDIA_INFO_BUFFERING_START MediaPlayer is temporarily pausing playback internally in order to buffer more data.
  int	MEDIA_INFO_METADATA_UPDATE A new set of metadata is available.
  int	MEDIA_INFO_NOT_SEEKABLE The media cannot be seeked (e.g live stream)
  int	MEDIA_INFO_STARTED_AS_NEXT The player was started because it was used as the next player for another player, which just completed playback.
  int	MEDIA_INFO_SUBTITLE_TIMED_OUT Reading the subtitle track takes too long.
  int	MEDIA_INFO_UNKNOWN Unspecified media player info.
  int	MEDIA_INFO_UNSUPPORTED_SUBTITLE Subtitle track was not supported by the media framework.
  int	MEDIA_INFO_VIDEO_NOT_PLAYING Informs that video is not playing.
  int	MEDIA_INFO_VIDEO_RENDERING_START The player just pushed the very first video frame for rendering.
  int	MEDIA_INFO_VIDEO_TRACK_LAGGING The video is too complex for the decoder: it can't decode frames fast enough.
  String	MEDIA_MIMETYPE_TEXT_SUBRIP This constant was deprecated in API level 28. use MediaFormat.MIMETYPE_TEXT_SUBRIP
  int	PREPARE_DRM_STATUS_PREPARATION_ERROR The DRM preparation has failed .
  int	PREPARE_DRM_STATUS_PROVISIONING_NETWORK_ERROR The device required DRM provisioning but couldn't reach the provisioning server.
  int	PREPARE_DRM_STATUS_PROVISIONING_SERVER_ERROR The device required DRM provisioning but the provisioning server denied the request.
  int	PREPARE_DRM_STATUS_SUCCESS The status codes for MediaPlayer.OnDrmPreparedListener.onDrmPrepared(MediaPlayer, int)listener.
  int	SEEK_CLOSEST This mode is used with seekTo(long, int) to move media position to a frame (not necessarily a key frame) associated with a data source that is located closest to or at the given time.
  int	SEEK_CLOSEST_SYNC This mode is used with seekTo(long, int) to move media position to a sync (or key) frame associated with a data source that is located closest to (in time) or at the given time.
  int	SEEK_NEXT_SYNC This mode is used with seekTo(long, int) to move media position to a sync (or key) frame associated with a data source that is located right after or at the given time.
  int	SEEK_PREVIOUS_SYNC This mode is used with seekTo(long, int) to move media position to a sync (or key) frame associated with a data source that is located right before or at the given time.
  int	VIDEO_SCALING_MODE_SCALE_TO_FIT Specifies a video scaling mode.
  int	VIDEO_SCALING_MODE_SCALE_TO_FIT_WITH_CROPPING Specifies a video scaling mode.

  Fields
  protectedAudioAttributes	mAttributes
  protected float	mAuxEffectSendLevel
  protected float	mLeftVolume
  protected float	mRightVolume

  Public constructors
  MediaPlayer() Default constructor.

  Public methods
  void	addOnRoutingChangedListener(AudioRouting.OnRoutingChangedListenerlistener, Handler handler) Adds an AudioRouting.OnRoutingChangedListener to receive notifications of routing changes on this MediaPlayer.
  void	addTimedTextSource(FileDescriptor fd, String mimeType) Adds an external timed text source file (FileDescriptor).
  void	addTimedTextSource(String path, String mimeType) Adds an external timed text source file.
  void	addTimedTextSource(FileDescriptor fd, long offset, long length,String mime) Adds an external timed text file (FileDescriptor).
  void	addTimedTextSource(Context context, Uri uri, String mimeType) Adds an external timed text source file (Uri).
  void	attachAuxEffect(int effectId) Attaches an auxiliary effect to the player.
  void	clearOnMediaTimeDiscontinuityListener() Clears the listener previously set withsetOnMediaTimeDiscontinuityListener(OnMediaTimeDiscontinuityListener)or setOnMediaTimeDiscontinuityListener(OnMediaTimeDiscontinuityListener, Handler)
  void	clearOnSubtitleDataListener() Clears the listener previously set withsetOnSubtitleDataListener(OnSubtitleDataListener) orsetOnSubtitleDataListener(OnSubtitleDataListener, Handler).
  static MediaPlayer	create(Context context, Uri uri, SurfaceHolder holder,AudioAttributes audioAttributes, int audioSessionId) Same factory method as create(Context, Uri, SurfaceHolder) but that lets you specify the audio attributes and session ID to be used by the new MediaPlayer instance.
  static MediaPlayer	create(Context context, int resid, AudioAttributes audioAttributes,int audioSessionId) Same factory 相關推薦 android官方API之MediaPlayer 來源：https://developer.android.com/reference/android/media/MediaPlayer MediaPlayer public class MediaPlayer extends Object implements android官方API之RecyclerView 來源：https://developer.android.com/reference/android/support/v7/widget/RecyclerView RecyclerView public class RecyclerView extends ViewGro android官方API之ConstraintLayout 來源：https://developer.android.com/reference/android/support/constraint/ConstraintLayout ConstraintLayout public class ConstraintLayout extends android官方API之AppCompatActivity 來源：https://developer.android.com/reference/android/support/v7/app/AppCompatActivity AppCompatActivity public class AppCompatActivity extends& android官方API之Toolbar 來源：https://developer.android.com/reference/android/widget/Toolbar Toolbar public class Toolbar extends ViewGroup  jav android官方API之EditText 來源：https://developer.android.com/reference/android/widget/EditText EditText public class EditText extends TextView  j android官方API之AsyncTask 來源：https://developer.android.com/reference/android/os/AsyncTask AsyncTask public abstract class AsyncTask extends Object  android官方API之ContentProvider 來源：https://developer.android.com/reference/android/content/ContentProvider ContentProvider public abstract class ContentProvider extends  android官方API之BroadcastReceiver 來源：https://developer.android.com/reference/android/content/BroadcastReceiver BroadcastReceiver public abstract class BroadcastReceiver extend Android官方資料之-OTA Package Tools The ota_from_target_files tool provided inbuild/tools/releasetools can build two types of package: full andincremental. The tool takes the target-files  aNDROID之MEDIapLaYER詳解 iap music media 詳解 list oid aid 5% layer %E8%BD%AC%E8%BD%BD%E4%B8%80%E4%B8%AA%E5%9B%BE%E7%89%87%E5%A4%84%E7%90%86%E5%B7%A5%E5%85%B7%E7%B1 Android官方MVVM框架實現組件化之整體結構 並且 pat 功能 模塊 txt cti stat 開發人員 extends 一、google官方MVVM框架講解 我前面對比了MVC和MVP《兩張圖看懂Android開發中MVC與MVP的區別》，可以相對於MVC我們的MVP是有多優越，但是Android開發現在已經開始流 Android官方架構組件介紹之LifeCycle(一) mave 工程 視圖 平時 清理 star new 內部 serve Android官方架構組件介紹之LifeCycle 下面是官方提供的Android App開發的架構圖： 從上圖可以看到一些關鍵字：ViewModel,LiveData,Room等。其實看了上面視頻的 Android官方架構組件介紹之ViewModel（三） gets use 時間管理 src context per and 發生 方法 ViewModel 像Activity，Fragment這類應用組件都有自己的生命周期並且是被Android的Framework所管理的。Framework可能會根據用戶的一些操作和設備的狀態對 Android官方架構組件介紹之應用（四） 怎麽 nbsp 註冊 bool 其他 info get inf prot 講一個項目常見的功能，友盟統計功能 例如一個項目有很多多modlue,每個裏面modlue都有Activity，Activity需要友盟統一，Fragment也需要友盟統計。一般做法就是繼承一個Bas Android提高第一篇之MediaPlayer 分享一下我老師大神的人工智慧教程！零基礎，通俗易懂！http://blog.csdn.net/jiangjunshow 也歡迎大家轉載本篇文章。分享知識，造福人民，實現我們中華民族偉大復興！         Android提高第二十篇之MediaPlayer播放網路音訊 分享一下我老師大神的人工智慧教程！零基礎，通俗易懂！http://blog.csdn.net/jiangjunshow 也歡迎大家轉載本篇文章。分享知識，造福人民，實現我們中華民族偉大復興！         Android提高第二十一篇之MediaPlayer播放網路視訊 分享一下我老師大神的人工智慧教程！零基礎，通俗易懂！http://blog.csdn.net/jiangjunshow 也歡迎大家轉載本篇文章。分享知識，造福人民，實現我們中華民族偉大復興！         Android API之android.widget.Filterable android.widget.Filterable 定義了一種可過濾的行為。Filterable介面通常有android.widget.Adapter來實現。介面Filterable中有個抽象方法getFilter()需要實現。 Filter android.widget.Filterable.ge Android官方文件之DataBinding庫 本文與公眾號三七文件庫同步。 本文由三七原創翻譯，轉載前務必聯絡三七。 本文件介紹瞭如何使用DataBinding庫來編寫宣告式佈局，並儘量減少繫結應用程式邏輯和佈局所需的中間程式碼。 DataBinding庫提供了靈活性和廣泛的相容性 - 這是