Simple music player

interface, the use of service services to build, to achieve background playback. Includes play, pause, replay, stop function

Let's take a look at its implementation (there are audio files in the path). 1. The interface layout does not introduce 2.service code

 Public classPlayerserviceextendsService {PrivateMediaPlayer player; @Override Public voidonCreate () {Super. OnCreate (); Log. I ("", "OnCreate" ); } @Override Public intOnstartcommand (Intent Intent,intFlagsintStartid) {Log. I ("", "Onstartcommand" ); return Super. Onstartcommand (Intent, flags, Startid); }          /*** This method is executed when the activity binds the service, returning the IBinder implementation (personal understanding, equivalent to the medium between components)*/@Override Publicibinder onbind (Intent Intent) {Log. I ("", "Onbind" ); return NewPlayerbinder (); }          /*** Implements player is used because if Playerbinder expands external functionality, it does not affect the player's call, enabling decoupling*/     Private classPlayerbinderextendsBinderImplementsplayer{@Override Public BooleanPlay (String path) {Booleanresult =false; Try{player=NewMediaPlayer (); Player.setaudiostreamtype (Audiomanager.                      Stream_music);                      Player.setdatasource (path);                      Player.prepare ();                     Player.start (); Result=true; } Catch(Exception e) {//illegalargumentexception, SecurityException, IllegalStateException, IOException (simplified processing)                      return false; }                 returnresult; }             //play, pause toggle@Override Publicstring SwitchState (String path) {string result= ""; if(player==NULL){                      if(play (path)) {result= "Paused"; } Else{result= "Play"; }                } Else if(Player.isplaying ()) {player.pause (); Result= "Play"; } Else{Player.start (); Result= "Paused"; }                 returnresult; } @Override PublicString Replay () {string result= ""; if(player!=NULL) {Player.seekto (0);                     Player.start (); Result= "Paused"; }                 returnresult; } @Override Publicstring Stop () {string result= ""; if(player!=NULL) {player.stop ();                      Player.release (); Player=NULL; Result= "Play"; }                 returnresult; } @Override Publicstring Getplayerstate () {string result= ""; if(player!=NULL&&player.isplaying ()) {Result= "Paused"; }                 returnresult; }} @Override Public voidOnDestroy () {Super. OnDestroy (); Log. I ("Service", "Ondestory" ); }}

Interface File

 Public Interface Player {           publicboolean  play (String path);        Public string SwitchState (string path);        Public String Replay ();        Public String Stop ();        Public String getplayerstate ();}

 3. Finally paste the activity code 

 Public classMainactivityextendsActivityImplementsOnclicklistener {PrivatePlayer Playerinter; PrivateEditText Etmainpath; PrivatePlayerconnection conn =Newplayerconnection (); PrivateButton Btmainplaypause, Btmainreplay, btmainstop; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);            Setcontentview (r.layout. Activity_main); Etmainpath=(EditText) Findviewbyid (R.id.et_main_path); Btmainplaypause=(Button) Findviewbyid (r.id.bt_mian_play_pause); Btmainreplay=(Button) Findviewbyid (R.id.bt_mian_replay); Btmainstop=(Button) Findviewbyid (r.id.bt_mian_stop); Btmainplaypause.setonclicklistener ( This); Btmainreplay.setonclicklistener ( This); Btmainstop.setonclicklistener ( This); //The service can only be created once, and once the activity is destroyed, creating the activity again will not recreate the serviceIntent startintent =NewIntent ( This, Playerservice.class );            StartService (startintent); Intent bindintent=NewIntent ( This, Playerservice.class );     Bindservice (Bindintent, Conn, bind_auto_create); }       Private classPlayerconnectionImplementsserviceconnection {//execute this method when the connection is successful, get the player operator interface@Override Public voidonserviceconnected (componentname name, IBinder service) {Playerinter=(Player) service; String State=playerinter.getplayerstate (); if(!state.equals ("") {btmainplaypause.settext (state); }} @Override Public voidonservicedisconnected (componentname name) {}}//Unbind at each end@Override Public voidFinish () {Super. Finish (); //Unbind the service connection at each end of activityUnbindservice (conn); Log. I ("", "disconnect" ); } @Override Public voidOnClick (View v) {Switch(V.getid ()) { Caser.id. bt_mian_play_pause:string playstate=playerinter.switchstate (Etmainpath.gettext (). toString (). Trim ()); if(!playstate.equals ("") {btmainplaypause.settext (playstate); }                  Break;  Caser.id. bt_mian_replay:string replaystate=Playerinter.replay (); if(!replaystate.equals ("") {btmainplaypause.settext (replaystate); }                  Break;  Caser.id. bt_mian_stop:string stopstate=Playerinter.stop (); if(!stopstate.equals ("") {btmainplaypause.settext (stopstate); }                  Break; default:                  Break; }} @Overrideprotected voidOnDestroy () {Super. OnDestroy (); Log. I ("Activity", "ondestory" ); } }

Simple music player