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Android Discussion :

Comprendre le BluetoothChat de Google Sample


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  1. #1
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    Par défaut Comprendre le BluetoothChat de Google Sample
    Bonjour,

    Je suis en train de développer une petite application Bluetooth en m'aidant du BluetoothChat sample de Google mais je suis encore débutant.
    J'aurais besoin d'un peu d'aides pour comprendre les lignes de codes :

    J'avais une première question : que signifie private static final String TAG = "BluetoothChatFragment"; ? J'ai vu dans des nombreux forums que cette ligne concernait les logs qu'on allait mettre ensuite mais je ne comprend pas vraiment ...

    Merci pour votre aide

  2. #2
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    Par défaut
    Voici le code du BluetoothChatFragment :

    Code : Sélectionner tout - Visualiser dans une fenêtre à part
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    /**
     * This fragment controls Bluetooth to communicate with other devices.
     */
    public class BluetoothChatFragment extends Fragment {
     
        private static final String TAG = "BluetoothChatFragment";
     
        // Intent request codes
        private static final int REQUEST_CONNECT_DEVICE_SECURE = 1;
        private static final int REQUEST_CONNECT_DEVICE_INSECURE = 2;
        private static final int REQUEST_ENABLE_BT = 3;
     
        // Layout Views
        private ListView mConversationView;
        private EditText mOutEditText;
        private Button mSendButton;
     
        /**
         * Name of the connected device
         */
        private String mConnectedDeviceName = null;
     
        /**
         * Array adapter for the conversation thread
         */
        private ArrayAdapter<String> mConversationArrayAdapter;
     
        /**
         * String buffer for outgoing messages
         */
        private StringBuffer mOutStringBuffer;
     
        /**
         * Local Bluetooth adapter
         */
        private BluetoothAdapter mBluetoothAdapter = null;
     
        /**
         * Member object for the chat services
         */
        private BluetoothChatService mChatService = null;
     
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setHasOptionsMenu(true);
            // Get local Bluetooth adapter
            mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
     
            // If the adapter is null, then Bluetooth is not supported
            if (mBluetoothAdapter == null) {
                    FragmentActivity activity = getActivity();
                    Toast.makeText(activity, "Bluetooth is not available", Toast.LENGTH_LONG).show();
                    activity.finish(); //the method onDestroy() is executed and dismisses any dialogs the activity was managing, closes any open search dialo
            }
        }
     
     
        @Override
        public void onStart() {
            super.onStart(); // ???
            // If BT is not on, request that it be enabled.
            // setupChat() will then be called during onActivityResult
            if (!mBluetoothAdapter.isEnabled()) {
                /*To enable bluetooth adapter you can start a system preference activity using the
                BluetoothAdapter.ACTION_REQUEST_ENABLE static constants as a startActivityForResult
                action string*/
                Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
                // Otherwise, setup the chat session
            } else if (mChatService == null) {
                setupChat();
            }
        }
     
        @Override
        public void onDestroy() {
            super.onDestroy();
            if (mChatService != null) {
                mChatService.stop();
            }
        }
     
        @Override
        public void onResume() {
            super.onResume();
     
            // Performing this check in onResume() covers the case in which BT was
            // not enabled during onStart(), so we were paused to enable it...
            // onResume() will be called when ACTION_REQUEST_ENABLE activity returns.
            if (mChatService != null) {
                // Only if the state is STATE_NONE, do we know that we haven't started already
                if (mChatService.getState() == BluetoothChatService.STATE_NONE) {
                    // Start the Bluetooth chat services
                    mChatService.start();
                }
            }
        }
     
        @Override
        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
                                 @Nullable Bundle savedInstanceState) {
            return inflater.inflate(R.layout.fragment_bluetooth_chat, container, false);
        }
     
        @Override
        public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
            mConversationView = (ListView) view.findViewById(R.id.in);
            mOutEditText = (EditText) view.findViewById(R.id.edit_text_out);
            mSendButton = (Button) view.findViewById(R.id.button_send);
        }
     
        /**
         * Set up the UI and background operations for chat.
         */
        private void setupChat() {
            Log.d(TAG, "setupChat()");
     
            // Initialize the array adapter for the conversation thread
            mConversationArrayAdapter = new ArrayAdapter<String>(getActivity(), R.layout.message);
     
            mConversationView.setAdapter(mConversationArrayAdapter);
     
            // Initialize the compose field with a listener for the return key
            mOutEditText.setOnEditorActionListener(mWriteListener);
     
            // Initialize the send button with a listener that for click events
            mSendButton.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    // Send a message using content of the edit text widget
                    View view = getView();
                    if (null != view) {
                        TextView textView = (TextView) view.findViewById(R.id.edit_text_out);
                        String message = textView.getText().toString();
                        sendMessage(message);
                    }
                }
            });
     
            // Initialize the BluetoothChatService to perform bluetooth connections
            mChatService = new BluetoothChatService(getActivity(), mHandler);
     
            // Initialize the buffer for outgoing messages
            mOutStringBuffer = new StringBuffer("");
        }
     
        /**
         * Makes this device discoverable for 300 seconds (5 minutes).
         */
        private void ensureDiscoverable() {
            if (mBluetoothAdapter.getScanMode() !=
                    BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
                Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
                discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
                startActivity(discoverableIntent);
            }
        }
     
        /**
         * Sends a message.
         *
         * @param message A string of text to send.
         */
        private void sendMessage(String message) {
            // Check that we're actually connected before trying anything
            if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) {
                Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show();
                return;
            }
     
            // Check that there's actually something to send
            if (message.length() > 0) {
                // Get the message bytes and tell the BluetoothChatService to write
                byte[] send = message.getBytes();
                mChatService.write(send);
     
                // Reset out string buffer to zero and clear the edit text field
                mOutStringBuffer.setLength(0);
                mOutEditText.setText(mOutStringBuffer);
            }
        }
     
        /**
         * The action listener for the EditText widget, to listen for the return key
         */
        private TextView.OnEditorActionListener mWriteListener
                = new TextView.OnEditorActionListener() {
            public boolean onEditorAction(TextView view, int actionId, KeyEvent event) {
                // If the action is a key-up event on the return key, send the message
                if (actionId == EditorInfo.IME_NULL && event.getAction() == KeyEvent.ACTION_UP) {
                    String message = view.getText().toString();
                    sendMessage(message);
                }
                return true;
            }
        };
     
        /**
         * Updates the status on the action bar.
         *
         * @param resId a string resource ID
         */
        private void setStatus(int resId) {
            FragmentActivity activity = getActivity();
            if (null == activity) {
                return;
            }
            final ActionBar actionBar = activity.getActionBar();
            if (null == actionBar) {
                return;
            }
            actionBar.setSubtitle(resId);
        }
     
        /**
         * Updates the status on the action bar.
         *
         * @param subTitle status
         */
        private void setStatus(CharSequence subTitle) {
            FragmentActivity activity = getActivity();
            if (null == activity) {
                return;
            }
            final ActionBar actionBar = activity.getActionBar();
            if (null == actionBar) {
                return;
            }
            actionBar.setSubtitle(subTitle);
        }
     
        /**
         * The Handler that gets information back from the BluetoothChatService
         */
        private final Handler mHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                FragmentActivity activity = getActivity();
                switch (msg.what) {
                    case Constants.MESSAGE_STATE_CHANGE:
                        switch (msg.arg1) {
                            case BluetoothChatService.STATE_CONNECTED:
                                setStatus(getString(R.string.title_connected_to, mConnectedDeviceName));
                                mConversationArrayAdapter.clear();
                                break;
                            case BluetoothChatService.STATE_CONNECTING:
                                setStatus(R.string.title_connecting);
                                break;
                            case BluetoothChatService.STATE_LISTEN:
                            case BluetoothChatService.STATE_NONE:
                                setStatus(R.string.title_not_connected);
                                break;
                        }
                        break;
                    case Constants.MESSAGE_WRITE:
                        byte[] writeBuf = (byte[]) msg.obj;
                        // construct a string from the buffer
                        String writeMessage = new String(writeBuf);
                        mConversationArrayAdapter.add("Me:  " + writeMessage);
                        break;
                    case Constants.MESSAGE_READ:
                        byte[] readBuf = (byte[]) msg.obj;
                        // construct a string from the valid bytes in the buffer
                        String readMessage = new String(readBuf, 0, msg.arg1);
                        mConversationArrayAdapter.add(mConnectedDeviceName + ":  " + readMessage);
                        break;
                    case Constants.MESSAGE_DEVICE_NAME:
                        // save the connected device's name
                        mConnectedDeviceName = msg.getData().getString(Constants.DEVICE_NAME);
                        if (null != activity) {
                            Toast.makeText(activity, "Connected to "
                                    + mConnectedDeviceName, Toast.LENGTH_SHORT).show();
                        }
                        break;
                    case Constants.MESSAGE_TOAST:
                        if (null != activity) {
                            Toast.makeText(activity, msg.getData().getString(Constants.TOAST),
                                    Toast.LENGTH_SHORT).show();
                        }
                        break;
                }
            }
        };
     
        public void onActivityResult(int requestCode, int resultCode, Intent data) {
            switch (requestCode) {
                case REQUEST_CONNECT_DEVICE_SECURE:
                    // When DeviceListActivity returns with a device to connect
                    if (resultCode == Activity.RESULT_OK) {
                        connectDevice(data, true);
                    }
                    break;
                case REQUEST_CONNECT_DEVICE_INSECURE:
                    // When DeviceListActivity returns with a device to connect
                    if (resultCode == Activity.RESULT_OK) {
                        connectDevice(data, false);
                    }
                    break;
                case REQUEST_ENABLE_BT:
                    // When the request to enable Bluetooth returns
                    if (resultCode == Activity.RESULT_OK) {
                        // Bluetooth is now enabled, so set up a chat session
                        setupChat();
                    } else {
                        // User did not enable Bluetooth or an error occurred
                        Log.d(TAG, "BT not enabled");
                        Toast.makeText(getActivity(), R.string.bt_not_enabled_leaving,
                                Toast.LENGTH_SHORT).show();
                        getActivity().finish();
                    }
            }
        }
     
        /**
         * Establish connection with other device
         *
         * @param data   An {@link Intent} with {@link DeviceListActivity#EXTRA_DEVICE_ADDRESS} extra.
         * @param secure Socket Security type - Secure (true) , Insecure (false)
         */
        private void connectDevice(Intent data, boolean secure) {
            // Get the device MAC address
            String address = data.getExtras()
                    .getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
            // Get the BluetoothDevice object
            BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
            // Attempt to connect to the device
            mChatService.connect(device, secure);
        }
     
        @Override
        public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
            inflater.inflate(R.menu.bluetooth_chat, menu);
        }
     
        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            switch (item.getItemId()) {
                case R.id.secure_connect_scan: {
                    // Launch the DeviceListActivity to see devices and do scan
                    Intent serverIntent = new Intent(getActivity(), DeviceListActivity.class);
                    startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_SECURE);
                    return true;
                }
                case R.id.insecure_connect_scan: {
                    // Launch the DeviceListActivity to see devices and do scan
                    Intent serverIntent = new Intent(getActivity(), DeviceListActivity.class);
                    startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_INSECURE);
                    return true;
                }
                case R.id.discoverable: {
                    // Ensure this device is discoverable by others
                    ensureDiscoverable();
                    return true;
                }
            }
            return false;
        }
     
    }
    Je me posais également la question : dans la méthode onStart(), pourquoi doit - on se référer à l'ancienne méthode hérité onStart() ? ( par l'intermédiaire de super.onStart() )

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