단거리 통신

관련 절차

 protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.v(TAG, "onCreate");

        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        if (mBluetoothAdapter == null) {
            Toast.makeText(this, " ", Toast.LENGTH_LONG).show();
            finish();
            return;
        }

        if (!mBluetoothAdapter.isEnabled()) {
            bluetoothStateChanged(BluetoothStatusReceiver.BLUETOOTH_OFF);
        }

        setContentView(R.layout.activity_server);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        mStartFab = (Button) findViewById(R.id.fab);
//        mStartFab.hide();
        mStartFab.setVisibility(View.GONE);
        mStartFab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mRecyclerAdapter.getNumSockets(ServerAdapter.ACCEPTED) == 0) {
                    Toast.makeText(ServerActivity.this, " ", Toast.LENGTH_SHORT).show();
                    return;
                }

                for (BluetoothSocket socket : mRecyclerAdapter.getSockets(ServerAdapter.UNACCEPTED))
                    mBinder.removeSocket(socket.getRemoteDevice().getAddress(), BluetoothServiceUtility.CLOSE_KICKED_FROM_SERVER);

                mBinder.setHandler(null);
                Intent intent = new Intent(ServerActivity.this, ChatroomActivity.class);
                intent.putExtra(ChatroomActivity.EXTRA_SERVER, true);
                startActivity(intent);
            }
        });
        mStatusText = (TextView) findViewById(R.id.tv_msg);
        mStatusText.append(" 
");
        mBlueToothName = (TextView) findViewById(R.id.tv_bluetooth_name);
        mBlueToothName.setText(mBluetoothAdapter.getName());
        mBlueAddress = (TextView) findViewById(R.id.tv_bluetooth_address);
        mBlueAddress.setText(mBluetoothAdapter.getAddress());

        mRecyclerView = (RecyclerView) findViewById(R.id.rv_client);
        mRecyclerAdapter = new ServerAdapter(this, this);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        mRecyclerView.setAdapter(mRecyclerAdapter);

        mHandler = new MyBluetoothHandler(this);
        mBluetoothConnection = new MyBluetoothConnection();
        bindService(new Intent(this, BluetoothService.class), mBluetoothConnection, BIND_AUTO_CREATE);
    }

public BluetoothMessage(@BluetoothMessageUtility.MESSAGE_TYPE int messageType, @NonNull String macAddress){
    checkMessageType(messageType);
    checkAddressLength(macAddress);

    mMessageType = messageType;
    mMacAddress = macAddress;
}

private static class MyBluetoothHandler extends BluetoothServiceHandler {

        private final WeakReference mActivity;

        public MyBluetoothHandler(ChatroomActivity activity) {
            mActivity = new WeakReference<>(activity);
        }

        @Override
        public void serverSetupFinished() {
            Log.w(TAG, "Should not have received a call to serverSetupFinished");
        }

        @Override
        public void connectionClosed(String macAddress, @BluetoothServiceUtility.CLOSE_CODE int closeCode) {
            Toast.makeText(mActivity.get(), BluetoothServiceUtility.getCloseCodeInfo(closeCode) +
                    " :   " + macAddress +"  ", Toast.LENGTH_SHORT).show();
            //TODO if server, tell all clients that somebody disconnected.
        }

        @Override
        public void appMessage(String address, byte[] data) {
            String msg = new String(data);
            if (data.length < BluetoothChatroomUtility.ID_LENGTH) {
                Log.w(TAG, "unreadable message " + msg);
                return;
            }

            String messageId = (msg.substring(0, BluetoothChatroomUtility.ID_LENGTH));
            String messageData = "";
            if (msg.length() > BluetoothChatroomUtility.ID_LENGTH)
                messageData = msg.substring(BluetoothChatroomUtility.ID_LENGTH, msg.length());

            switch (messageId) {
                case BluetoothChatroomUtility.ID_SEND_DISPLAY_TEXT:
                    mActivity.get().showMessage(messageData);
                    if (mActivity.get().mIsServer) {
                        String appMessage = BluetoothChatroomUtility.makeDisplayTextMessage(messageData);
                        mActivity.get().mBinder.writeMessage(appMessage.getBytes());
                    }
                    break;
                default:
                    Log.v(TAG, " unknown chatroom message id " + messageId + ", with message " + messageData);
                    break;
            }
        }
    }

    ServiceConnection mBluetoothConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.v(TAG, "BluetoothConnection connected");
            mConnected = true;
            mBinder = (BluetoothService.BluetoothBinder) service;
            mBinder.setHandler(mBT_Handler);

            if (mIsServer) {
                mBinder.serverReady();
            }
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.v(TAG, "BluetoothConnection disconnected");
            mConnected = false;
            mBinder = null;
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_chatroom);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        mIsServer = getIntent().getBooleanExtra(EXTRA_SERVER, false);

        BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
        mName = adapter.getName();
        mAddress = adapter.getAddress();

        mEditText = (EditText) findViewById(R.id.et_msg);
        btnSend = (Button) findViewById(R.id.btn_send);
        btnSend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String text = mEditText.getText().toString();
                String message = mName + "-----" + text;
                mEditText.setText("");
                if (mConnected) {
                    String chatMessage = BluetoothChatroomUtility.makeDisplayTextMessage(message);
                    mBinder.writeMessage(chatMessage.getBytes());
                }
                if (mIsServer)
                    showMessage(message);
            }
        });