Android - Using method from a Service in an Activity?

Question

I have the folowing method in a Service in my appplication:

public void switchSpeaker(boolean speakerFlag){

        if(speakerFlag){
        audio_service.setSpeakerphoneOn(false);
        }
        else{
        audio_service.setSpeakerphoneOn(true);
        }

    }

So my question is whats the best and most effective way to be able to use this method in an Activity like follows

final Button speaker_Button = (Button) findViewById(R.id.widget36);

            speaker_Button.setOnClickListener(new View.OnClickListener(){
                public void onClick(View v){

                    switchSpeaker(true); //method from Service

                }

            });

Do I have to do an AIDL or is there a simpler way?

Answer 1

There are 3 ways to binding service with your activity.

1. IBinder Implementation
2. Using Messanger
3. Using AIDL

Among these IBinder Implementation is the best suit in your case

Example of IBinder class

1. Server.java Service

public class Server extends Service{

    IBinder mBinder = new LocalBinder();


    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }

    public class LocalBinder extends Binder {
        public Server getServerInstance() {
            return Server.this;
        }
    }

    public void switchSpeaker(boolean speakerFlag){

        if(speakerFlag){
        audio_service.setSpeakerphoneOn(false);
        }
        else{
        audio_service.setSpeakerphoneOn(true);
        }

    }
}

2. Client.java Activity

public class Client extends Activity {

boolean mBounded;
Server mServer;
TextView text;
Button button;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

text = (TextView)findViewById(R.id.text);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            mServer.switchSpeaker(true);
        }
    });

}

@Override
protected void onStart() {
    super.onStart();
    Intent mIntent = new Intent(this, Server.class);
bindService(mIntent, mConnection, BIND_AUTO_CREATE);
};

ServiceConnection mConnection = new ServiceConnection() {

    public void onServiceDisconnected(ComponentName name) {
        Toast.makeText(Client.this, "Service is disconnected", 1000).show();
        mBounded = false;
        mServer = null;
    }

    public void onServiceConnected(ComponentName name, IBinder service) {
        Toast.makeText(Client.this, "Service is connected", 1000).show();
        mBounded = true;
        LocalBinder mLocalBinder = (LocalBinder)service;
        mServer = mLocalBinder.getServerInstance();
    }
};

@Override
protected void onStop() {
    super.onStop();
    if(mBounded) {
        unbindService(mConnection);
        mBounded = false;
    }
};
}

Example of Messanger class

1. Server.java service

public class Server extends Service{

    Messenger messenger = new Messenger(new LocalHandler());
    Messenger clientMessenger;
    static final int SysterTime = 0;
    static final int AddHandler = 1;
    List<Handler> mHandlers;

    @Override
    public void onCreate() {
        super.onCreate();
        mHandlers = new ArrayList<Handler>();
    }

    @Override
    public IBinder onBind(Intent intent) {
        return messenger.getBinder();
    }

    public class LocalHandler extends Handler {

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case SysterTime:
                SimpleDateFormat mDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                try {
                    clientMessenger.send(Message.obtain(null, SysterTime, mDateFormat.format(new Date())));
                } catch (RemoteException e) {
                    e.printStackTrace();
                }
                break;

            case AddHandler:
                clientMessenger = new Messenger((Handler) msg.obj);
                try {
                    clientMessenger.send(Message.obtain(null, AddHandler, "Registed messanger"));
                } catch (RemoteException e) {
                    e.printStackTrace();
                }
                break;

            default:
                break;
            }
            super.handleMessage(msg);
        }
    }
}

2. Client.java Activity

public class Client extends Activity {

    Messenger messenger;
    boolean mBounded;
    TextView text;
    Button button;
    Button register;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        text = (TextView)findViewById(R.id.text);
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                Message message = Message.obtain(null, Server.SysterTime, null);
                try {
                    messenger.send(message);
                } catch (RemoteException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        });

        register = (Button) findViewById(R.id.register);
        register.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                Message message = Message.obtain(null, Server.AddHandler, new ClientHandle());
                try {
                    messenger.send(message);
                } catch (RemoteException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        });

    }


    public class ClientHandle extends Handler {

        @Override
        public void handleMessage(Message msg) {

            switch (msg.what) {
            case Server.SysterTime:
                text.setText(msg.obj.toString());
                break;

            case Server.AddHandler:
                text.setText(msg.obj.toString());
                break;

            default:
                break;
            }

            super.handleMessage(msg);
        }


    }

    @Override
    protected void onStart() {
        super.onStart();

        bindService(new Intent(this, Server.class), mConnection, BIND_AUTO_CREATE);
    }



    @Override
    protected void onStop() {
        super.onStop();
        if(mBounded) {
            unbindService(mConnection);
        }
    }



    ServiceConnection mConnection = new ServiceConnection() {

        public void onServiceDisconnected(ComponentName name) {
            mBounded = false;
            messenger = null;
        }

        public void onServiceConnected(ComponentName name, IBinder service) {
            Toast.makeText(Client.this, "Service is connected", 1000).show();
            messenger = new Messenger(service);
            mBounded = true;
        }
    };
}

Example of AIDL

1. IRemoteService.aidl

package com.example.bindservice.aidl;

interface IRemoteService {

    String getMessage(String msg);
}

2. Server.java Service

public class Server extends Service{

    @Override
    public IBinder onBind(Intent intent) {
        return mStub;
    }

    IRemoteService.Stub mStub = new IRemoteService.Stub() {

        public String getMessage(String msg) throws RemoteException {
            return msg;
        }
    };
}

3. Client.java Activity

public class Client extends Activity {

    Button button;
    TextView text;
    boolean mBound;
    IRemoteService mIRemoteService;
    EditText etMsg;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        text = (TextView)findViewById(R.id.text);
        button = (Button) findViewById(R.id.button);
        etMsg = (EditText)findViewById(R.id.etMsg);
        button.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                if(mBound) {
                    try {
                        text.setText(mIRemoteService.getMessage(etMsg.getText().toString()));
                    } catch (RemoteException e) {
                        e.printStackTrace();
                    }                   
                }
            }
        });
    }

    @Override
    protected void onStart() {
        super.onStart();
        bindService(new Intent(Client.this, Server.class), mConnection, BIND_AUTO_CREATE);
    }

    @Override
    protected void onStop() {
        super.onStop();
        if(mBound) {
            unbindService(mConnection);
            mBound = false; 
        }
    }

    ServiceConnection mConnection = new ServiceConnection() {

        public void onServiceDisconnected(ComponentName name) {
            mIRemoteService = null;
            mBound = false;
        }

        public void onServiceConnected(ComponentName name, IBinder service) {
            mIRemoteService = IRemoteService.Stub.asInterface(service);
            mBound = true;
        }
    };
}

For more study you can refer this document