Android uses AIDL to play music

This example shares the specific code for Android to use AIDL to play music for your reference. The specific content is as follows

Ideas:

① Create two new APP projects or modules, one as the server and the other as the client, create a service on the server.

② Create two new aidl files (interfaces) in the main files of two modules, and define the method of processing music.

③ After defining the method of two AIDL files, give them makeproject in the taskbar and compile it into Java files, so that they can be used in service and acvitity.
Need to instantiate and implement remote methods

④.The onbind method in Service returns:.

The service needs to set an action, otherwise the client service will report a null pointer exception when running.
First handle the server:

In the Mainfest file, add an action to the implicit call of intent

 <service
   android:name=".MusicService"
   android:enabled="true"
   android:exported="true">
   <intent-filter>
   <action android:name=""></action>
 </intent-filter>

MusicService。Java

public class MusicService extends Service {

  private MediaPlayer player = null;

  public MusicService() {
  }

  //① Implement the adil interface that has been madeprojected and rewrite the three custom definitions in it.   stub = new () {
    @Override
    public void paly() throws RemoteException {
      if (player == null) {
        player = (, );
      }
      if (player != null &amp;&amp; !()){
        ();
      }

    }

    @Override
    public void paus() throws RemoteException {
      if(player!=null&amp;&amp;()){
        ();
      }

    }

    @Override
    public void stop() throws RemoteException {
      if(player!=null){
        ();
      }
      try {
        ();//Prepare for next playback      } catch (IOException e) {
        ();
      }

    }
  };

  @Override
  public IBinder onBind(Intent intent) {
    return stub;
  }
  //② Rewrite the method when service is destroyed
  @Override
  public void onDestroy() {
    ();
    if(player!=null){
      ();
      ();//Release resources to prevent the loss of the support and the occurrence of abnormalities    }
  }

Handle the client

public class MainActivity extends AppCompatActivity implements  {
  private Button btn_play, btn_pause, btn_stop, btn_stopservice, btn_stopacvitity;
   MusicAidlInterface service = null;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    (savedInstanceState);
    setContentView(.activity_main);
    intiView();
    connect();

  }

  private void intiView() {
    btn_play = (Button) findViewById(.btn_play);
    btn_pause = (Button) findViewById(.btn_pause);
    btn_stopservice = (Button) findViewById(.btn_stopservice);
    btn_stopacvitity = (Button) findViewById(.btn_exitacvitity);
    btn_stop = (Button) findViewById(.btn_stop);

    btn_play.setOnClickListener(this);
    btn_pause.setOnClickListener(this);
    btn_stop.setOnClickListener(this);
    btn_stopservice.setOnClickListener(this);
    btn_stopacvitity.setOnClickListener(this);
  }

  @Override
  public void onClick(View v) {
    try {
      switch (()) {
        case .btn_play:
          ();
          break;
        case .btn_pause:
          ();
          break;
        case .btn_stop:
          ();
          break;
        case .btn_stopservice:
          if (conn != null) {
            unbindService(conn);
          }
          break;
        case .btn_exitacvitity:
          finish();
          break;
      }
    } catch (RemoteException e) {
      ();
    }

  }

  //Connect service  ServiceConnection conn = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName name, IBinder iBinder) {
      service = (iBinder);
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
      service = null;
    }
  };

  //Get the method to connect to BindService  private void connect() {
    //Use the implicit call method of intent    Intent intent = new Intent("");
    //Set the package name of the target service    ("");
    bindService(intent, conn, BIND_AUTO_CREATE);
  }
  //Rewrite the method of unbinding when acvitity is destroyed
  @Override
  protected void onDestroy() {
    ();
    if (conn != null) {//Unbind      unbindService(conn);
    }
  }

The above is all the content of this article. I hope it will be helpful to everyone's study and I hope everyone will support me more.