我正在处理一个项目，我需要将平板电脑（android 4.2.2）连接到蓝牙转UART转换器（RN42 by microchip）。 我正在使用BluetoothChat示例来管理蓝牙连接，但很难连接。有时程序在方法mmSocket.connect（）; - 它抛出IOException。有时我需要三次或更多次尝试连接到我的远程设备。连接完成后，非常稳定。 我试图改变UUID，试图改变rn42模块（我也尝试使用HC-05模块）。 我尝试了安全和不安全的rfcomm连接，仍然没有运气。 这是我的代码： 在MainActivity中：
@Override
public void onButtonPressed(View view, Device device){
switch (view.getId()){
case R.id.buttonRedaguotiIrengini:
// Edit button is pressed
Intent i = new Intent(this, DeviceActivity.class);
i.putExtra("device", device);
i.putExtra("requestCode", REQUEST_EDIT_DEVICE);
startActivityForResult(i, REQUEST_EDIT_DEVICE);
break;
case R.id.buttonPrisijungti:
if (mBtService.getState()==BluetoothService.STATE_CONNECTED){
mBtService.stop();
} else {
BluetoothDevice btDevice = mBluetoothAdapter.getRemoteDevice(device.getMac());
mBtService.connect(btDevice, false);
}
break;
}
}
：
// Name for the SDP record when creating server socket
private static final String NAME_SECURE = "BluetoothChatSecure";
private static final String NAME_INSECURE = "BluetoothChatInsecure";
// Unique UUID for this application
private static final UUID MY_UUID_SECURE =UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
private static final UUID MY_UUID_INSECURE = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// Member fields
private final BluetoothAdapter mAdapter;
private final Handler mHandler;
private AcceptThread mSecureAcceptThread;
private AcceptThread mInsecureAcceptThread;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
// Constants that indicate the current connection state
public static final int STATE_NONE = 0; // we're doing nothing
public static final int STATE_LISTEN = 1; // now listening for incoming connections
public static final int STATE_CONNECTING = 2; // now initiating an outgoing connection
public static final int STATE_CONNECTED = 3; // now connected to a remote device
public synchronized void connect(BluetoothDevice device, boolean secure) {
if (D) Log.d(TAG, "connect to: " + device);
// Cancel any thread attempting to make a connection
if (mState == STATE_CONNECTING) {
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
// Start the thread to connect with the given device
mConnectThread = new ConnectThread(device, secure);
mConnectThread.start();
setState(STATE_CONNECTING);
}
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
private String mSocketType;
public ConnectThread(BluetoothDevice device, boolean secure) {
mmDevice = device;
BluetoothSocket tmp = null;
mSocketType = secure ? "Secure" : "Insecure";
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {
if (secure) {
tmp = device.createRfcommSocketToServiceRecord(
MY_UUID_SECURE);
} else {
tmp = device.createInsecureRfcommSocketToServiceRecord(
MY_UUID_INSECURE);
}
} catch (IOException e) {
Log.e(TAG, "Socket Type: " + mSocketType + "create() failed", e);
}
mmSocket = tmp;
}
public void run() {
Log.i(TAG, "BEGIN mConnectThread SocketType:" + mSocketType);
setName("ConnectThread" + mSocketType);
// Always cancel discovery because it will slow down a connection
mAdapter.cancelDiscovery();
// Make a connection to the BluetoothSocket
try {
// This is a blocking call and will only return on a
// successful connection or an exception
if (D) {Log.d(TAG, "will try to connect to socket");};
mmSocket.connect();
} catch (IOException e) {
// Close the socket
if (D) {Log.d(TAG, "failed to connect to socket");};
e.printStackTrace();
try {
mmSocket.close();
} catch (IOException e2) {
Log.e(TAG, "unable to close() " + mSocketType +
" socket during connection failure", e2);
}
connectionFailed();
return;
}
if (D){Log.d(TAG, "Success");};
// Reset the ConnectThread because we're done
synchronized (BluetoothService.this) {
mConnectThread = null;
}
// Start the connected thread
connected(mmSocket, mmDevice, mSocketType);
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of connect " + mSocketType + " socket failed", e);
}
}
}
private void connectionFailed() {
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(MainActivity.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(MainActivity.TOAST, "Unable to connect device");
msg.setData(bundle);
mHandler.sendMessage(msg);
if (D){Log.d(TAG, "Failed, unable to connect device");};
setState(STATE_NONE);
}
以下是LogCat输出
03-12 16:01:38.992: D/mBT(9947): connect to: 00:06:66:67:44:3E
03-12 16:01:38.992: I/BluetoothSocket_MTK(9947): [JSR82] Bluetooth Socket Constructor
03-12 16:01:38.992: I/BluetoothSocket_MTK(9947): [JSR82] type=1 fd=-1 auth=false encrypt=false port=-1
03-12 16:01:38.993: D/BTSocketService(452): [JSR82][Service] initSocket
03-12 16:01:38.993: I/BluetoothSocketService.cpp(452): [JSR82][JNI] initSocketNative +++.
03-12 16:01:38.993: I/BluetoothSocketService.cpp(452): [JSR82][JNI] initSocketNative: start to initialize socket.
03-12 16:01:38.993: I/BluetoothSocketService.cpp(452): [JSR82][JNI] type=1, auth=0, encrypt=0, port=-1
03-12 16:01:38.993: I/BluetoothSocketService.cpp(452): [JSR82][JNI] initSocketNative: Initialize socket done.
03-12 16:01:38.993: E/BluetoothSocketService.cpp(452): [JSR82] alloc context : index=2
03-12 16:01:38.993: E/BluetoothSocketService.cpp(452): [JSR82] Clear context : index=2, ctx.index=0, ctx.fd=0
03-12 16:01:38.993: I/BluetoothSocketService.cpp(452): [JSR82][JNI] jsr82ConnectCond (2) initialization success
03-12 16:01:38.993: I/BluetoothSocketService.cpp(452): [JSR82][JNI] jsr82ReadCond (2) initialization success <READ>
03-12 16:01:38.993: I/BluetoothSocketService.cpp(452): [JSR82][JNI] jsr82WriteCond (2) initialization success <WRITE>
03-12 16:01:38.993: I/BluetoothSocketService.cpp(452): [JSR82][JNI] jsr82RegisterCond (2) initialization success <REGISTER>
03-12 16:01:38.993: I/BluetoothSocketService.cpp(452): [JSR82][JNI] initSocketNative ---. fdHandle=32770
03-12 16:01:38.995: D/mBT(9947): setState() 1 -> 2
03-12 16:01:38.998: I/mBT(9947): BEGIN mConnectThread SocketType:Insecure
03-12 16:01:39.001: D/BluetoothService(452): [API] cancelDiscovery()
03-12 16:01:39.001: I/BluetoothService.cpp(452): [GAP][API] stopDiscoveryNative
03-12 16:01:39.001: I/BluetoothService.cpp(452): [GAP] btmtk_gap_discovery_cancel
03-12 16:01:39.001: I/BluetoothService.cpp(452): [GAP] btmtk_gap_discovery_cancel already cancelled
03-12 16:01:39.001: I/BluetoothService.cpp(452): [GAP] btmtk_gap_send_discovery_stop_event
03-12 16:01:39.001: I/BluetoothService.cpp(452): [JNI] bt_sendind(ptr=0x5C6AEA50, len=28)
03-12 16:01:39.001: I/BluetoothService.cpp(452): [JNI] send ind=3528
03-12 16:01:39.001: I/BluetoothEventLoop.cpp(452): [MSG] Polling returned
03-12 16:01:39.001: I/BluetoothEventLoop.cpp(452): [MSG] Start retrieve data
03-12 16:01:39.002: I/BluetoothEventLoop.cpp(452): [MSG] fd 1 data ready
03-12 16:01:39.002: I/BluetoothEventLoop.cpp(452): [MSG] nat->pollData[i].fd data ready : revents = 0x1
03-12 16:01:39.002: I/BluetoothEventLoop.cpp(452): [MSG] msg 3528 received : size=28
03-12 16:01:39.002: I/BluetoothEventLoop.cpp(452): [GAP] receive event=3528
03-12 16:01:39.002: I/BluetoothEventLoop.cpp(452): [GAP] btmtk_util_update_adapter_property_discovering: is_discovering = 0
03-12 16:01:39.002: D/BluetoothEventLoop(452): Property Changed: Discovering : false
03-12 16:01:39.006: I/BluetoothService.cpp(452): [JNI] send ind success : 28
03-12 16:01:39.007: I/BluetoothEventLoop.cpp(452): [MSG] Start polling
03-12 16:01:39.008: V/BluetoothEventManager(1562): Received android.bluetooth.adapter.action.DISCOVERY_FINISHED
03-12 16:01:39.011: D/mBT(9947): will try to connect to socket
03-12 16:01:39.011: I/BluetoothSocket_MTK(9947): [JSR82] connect: do SDP
03-12 16:01:39.012: D/BluetoothService(452): [API] fetchRemoteUuids(00:06:66:67:44:3E)
03-12 16:01:39.012: V/BluetoothAdapterProperties(452): getObjectPath():MTKBT/dev_
03-12 16:01:39.012: I/BluetoothService.cpp(452): [GAP][API] discoverServicesNative : addr=MTKBT/dev_00_06_66_67_44_3E, pattern=00001101-0000-1000-8000-00805f9b34fb
03-12 16:01:39.013: I/BluetoothService.cpp(452): [GAP] btmtk_gap_service_search_raw_request addr=67443E:66:6, size=19
03-12 16:01:39.013: D/[BT](142): mtk_bt_write: buffer bebcbcc8, len 5
03-12 16:01:39.013: I/BluetoothService.cpp(452): [GAP] btmtk_gap_send_sdp_discover_event
03-12 16:01:39.013: I/BluetoothService.cpp(452): [JNI] bt_sendind(ptr=0x54B921A0, len=60)
03-12 16:01:39.013: I/BluetoothService.cpp(452): [JNI] send ind=3535
03-12 16:01:39.013: I/BluetoothService.cpp(452): [JNI] send ind success : 60
03-12 16:01:39.013: I/BluetoothEventLoop.cpp(452): [MSG] Polling returned
03-12 16:01:39.013: I/BluetoothEventLoop.cpp(452): [MSG] Start retrieve data
03-12 16:01:39.013: I/BluetoothEventLoop.cpp(452): [MSG] fd 1 data ready
03-12 16:01:39.014: I/BluetoothEventLoop.cpp(452): [MSG] nat->pollData[i].fd data ready : revents = 0x1
03-12 16:01:39.014: I/BluetoothEventLoop.cpp(452): [MSG] msg 3535 received : size=60
03-12 16:01:39.014: I/BluetoothEventLoop.cpp(452): [GAP] receive event=3535
03-12 16:01:39.014: I/BluetoothEventLoop.cpp(452): [GAP] receive event ANDROID_EV_SDP_DEVICE_CREATE 0x67443E:0x66:0x6
03-12 16:01:39.014: I/BluetoothEventLoop.cpp(452): [GAP] pattern (16) 0: 0:11: 1
03-12 16:01:39.014: I/BluetoothEventLoop.cpp(452): [MSG] Start polling
03-12 16:01:39.015: V/BluetoothDiscoveryReceiver(1562): Received: android.bluetooth.adapter.action.DISCOVERY_FINISHED
03-12 16:01:39.018: D/[BT](142): mtk_bt_read: buffer 401c901c, len 1
03-12 16:01:39.018: D/[BT](142): mtk_bt_read: buffer 401c9024, len 2
03-12 16:01:39.018: D/[BT](142): mtk_bt_read: buffer 401980e6, len 4
03-12 16:01:39.018: D/[BT](142): mtk_bt_read: buffer 401c901c, len 1
03-12 16:01:39.019: D/[BT](142): mtk_bt_write: buffer bebcbcc8, len 5
03-12 16:01:39.026: D/[BT](142): mtk_bt_read: buffer 401c901c, len 1
03-12 16:01:39.026: D/[BT](142): mtk_bt_read: buffer 401c9024, len 2
03-12 16:01:39.026: D/[BT](142): mtk_bt_read: buffer 401981e7, len 4
03-12 16:01:39.026: D/[BT](142): mtk_bt_read: buffer 401c901c, len 1
03-12 16:01:39.026: D/[BT](142): mtk_bt_write: buffer bebcbcc8, len 17
03-12 16:01:39.032: D/[BT](142): mtk_bt_read: buffer 401c901c, len 1
03-12 16:01:39.032: D/[BT](142): mtk_bt_read: buffer 401c9024, len 2
03-12 16:01:39.032: D/[BT](142): mtk_bt_read: buffer 401982e8, len 4
03-12 16:01:39.033: D/[BT](142): mtk_bt_read: buffer 401c901c, len 1
03-12 16:01:40.017: D/[BT](142): mtk_bt_read: buffer 401c901c, len 1
03-12 16:01:40.017: D/[BT](142): mtk_bt_read: buffer 401c9024, len 2
03-12 16:01:40.017: D/[BT](142): mtk_bt_read: buffer 401983e9, len 4
03-12 16:01:40.017: D/[BT](142): mtk_bt_read: buffer 401c901c, len 1
03-12 16:01:44.775: D/Bluetooth HS/HF(692): [BT][HFG] [API] mStateReceiver.onReceive(android.intent.action.BATTERY_CHANGED)
03-12 16:01:44.776: D/Bluetooth HS/HF(692): [BT][HFG] [API] mHandler.handleMessage(9)
03-12 16:01:44.776: D/Bluetooth HS/HF(692): [BT][HFG] [API] updateBatteryState
03-12 16:01:45.014: D/BluetoothService(452): [API] getUuidFromCache(00:06:66:67:44:3E)
03-12 16:01:45.015: D/BluetoothService(452): [API] getUuidFromCache=00001101-0000-1000-8000-00805f9b34fb)
03-12 16:01:45.016: D/BluetoothService(452): [API] getUuidFromCache=00001101-0000-1000-8000-00805f9b34fb)
03-12 16:01:45.016: D/BluetoothService(452): [API] sendUuidIntent(00:06:66:67:44:3E)
03-12 16:01:45.020: D/Bluetooth HSHFP(692): [BT][HFG][Intent] action=android.bluetooth.device.action.UUID, state=0
03-12 16:01:45.022: D/BluetoothService(452): [API] makeServiceChannelCallbacks(00:06:66:67:44:3E)
03-12 16:01:45.022: D/BluetoothService(452): Cleaning up failed UUID channel lookup: 00:06:66:67:44:3E 00001101-0000-1000-8000-00805f9b34fb
03-12 16:01:45.022: I/BluetoothSocket_MTK(9947): [JSR82] SdpHelper::onRfcommChannelFound: channel=-1
03-12 16:01:45.023: D/mBT(9947): failed to connect to socket
03-12 16:01:45.023: W/System.err(9947): java.io.IOException: Service discovery failed
03-12 16:01:45.024: W/System.err(9947): at android.bluetooth.BluetoothSocket$SdpHelper.doSdp(BluetoothSocket.java:813)
03-12 16:01:45.024: W/System.err(9947): at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:382)
03-12 16:01:45.024: W/System.err(9947): at p.demoui.BluetoothService$ConnectThread.run(BluetoothService.java:389)
03-12 16:01:45.024: I/BluetoothSocket_MTK(9947): [JSR82] close
03-12 16:01:45.024: I/BluetoothSocket_MTK(9947): [JSR82] readLock got.
03-12 16:01:45.025: D/BTSocketService(452): [JSR82][Service] abort
03-12 16:01:45.025: I/BluetoothSocketService.cpp(452): [JSR82][JNI] abortNative +++. fd=32770.
03-12 16:01:45.025: I/BluetoothSocketService.cpp(452): [JSR82][JNI] abortNative ---.
03-12 16:01:45.025: I/BluetoothSocket_MTK(9947): [JSR82] Start to aquire writeLock.
03-12 16:01:45.026: I/BluetoothSocket_MTK(9947): [JSR82] writeLock got.
03-12 16:01:45.026: D/BTSocketService(452): [JSR82][Service] destroy
03-12 16:01:45.026: I/BluetoothSocketService.cpp(452): [JSR82][JNI] destroyNative: fd=32770.
03-12 16:01:45.026: E/BluetoothSocketService.cpp(452): [JSR82] Clear context : index=2, ctx.index=-1, ctx.fd=32770
03-12 16:01:45.030: D/mBT(9947): Failed, unable to connect device
03-12 16:01:45.030: D/mBT(9947): setState() 2 -> 0
哪里出错？我该如何改进这段代码？ 为什么在这种情况下抛出IOException？
感谢您的帮助。
答案 0 :(得分：1)
以下是我完成类似蓝牙连接和发送命令的方法。我发布了完整的演示代码，请试一试。
BluetoothService.java （来自BluetoothChat示例的同一类）
可在此处找到http://stanford.edu/~tpurtell/BluetoothChatService.java
在我的情况下，MacID已经预先给了我。
<强> MainActivity.java
public class MainActivity extends Activity implements OnClickListener {
// Layout Views
private Button bt_on_off;
private TextView statuses;
private Button connectIt;
private Button click;
//Timer timer;
private boolean isBTOnOrOff = false;
// Debugging
private static final String TAG = "BluetoothChat";
private static final boolean D = true;
// Message types sent from the BluetoothChatService Handler
public static final int MESSAGE_STATE_CHANGE = 1;
public static final int MESSAGE_READ = 2;
public static final int MESSAGE_WRITE = 3;
public static final int MESSAGE_DEVICE_NAME = 4;
public static final int MESSAGE_TOAST = 5;
// Key names received from the BluetoothChatService Handler
public static final String DEVICE_NAME = "device_name";
public static final String TOAST = "toast";
// Intent request codes
private static final int REQUEST_CONNECT_DEVICE = 1;
private static final int REQUEST_ENABLE_BT = 2;
// 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 BluetoothService mChatService = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
enableDissableViews(false);
listeners();
preBTConfigCheck();
}
private void initViews() {
bt_on_off = (Button) findViewById(R.id.bt_on_off);
connectIt= (Button) findViewById(R.id.connect);
statuses= (TextView) findViewById(R.id.statuses);
click= (Button) findViewById(R.id.click);
}
private void listeners() {
bt_on_off.setOnClickListener(this);
connectIt.setOnClickListener(this);
click.setOnClickListener(this);
}
// Broadcast reciever for BT
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
final int state = intent.getIntExtra(
BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
switch (state) {
case BluetoothAdapter.STATE_OFF:
enableDissableViews(false);
isBTOnOrOff=false;
bt_on_off.setText(getResources().getString(
R.string.on_off_status)
+ "OFF");
if (D)
Log.d(TAG, "STATE OFF");
break;
case BluetoothAdapter.STATE_TURNING_OFF:
enableDissableViews(false);
bt_on_off.setText(getResources().getString(
R.string.on_off_status)
+ "Turning off...");
if (D)
Log.d(TAG, "STATE Turning off...");
break;
case BluetoothAdapter.STATE_ON:
bt_on_off.setText(getResources().getString(
R.string.on_off_status)
+ "ON");
if (D)
Log.d(TAG, "STATE ON");
enableDissableViews(true);
isBTOnOrOff=true;
break;
case BluetoothAdapter.STATE_TURNING_ON:
bt_on_off.setText(getResources().getString(
R.string.on_off_status)
+ "Turning on...");
if (D)
Log.d(TAG, "STATE Turning on...");
break;
}
}
}
};
private void preBTConfigCheck() {
// Register for broadcasts on BluetoothAdapter state change
IntentFilter filter = new IntentFilter(
BluetoothAdapter.ACTION_STATE_CHANGED);
this.registerReceiver(mReceiver, filter);
// Get local Bluetooth adapter
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
// If the adapter is null, then Bluetooth is not supported
if (mBluetoothAdapter == null) {
// Device does not support Bluetooth
Toast.makeText(MainActivity.this,
"BlueTooth Not supported on your device!", 0).show();
bt_on_off.setText(getResources().getString(R.string.on_off_status)
+ "NOT SUPPORTED");
enableDissableViews(false);
} else {
// status of BT
isBTOnOrOff = mBluetoothAdapter.isEnabled();
if (D)
Log.d(TAG, "BT status @ preBTConfigCheck() ->" + isBTOnOrOff);
if (isBTOnOrOff) {
// Bluetooth is enable,
bt_on_off.setText(getResources().getString(
R.string.on_off_status)
+ "ON");
enableDissableViews(isBTOnOrOff);
} else {
bt_on_off.setText(getResources().getString(
R.string.on_off_status)
+ "OFF");
// User did not enable Bluetooth or an error occurred
if (D)
Log.d(TAG, "BT not enabled");
enableDissableViews(isBTOnOrOff);
}
}
}
@Override
public void onStart() {
super.onStart();
if(D) Log.e(TAG, "++ ON START ++");
// If BT is not on, request that it be enabled.
// setupChat() will then be called during onActivityResult
if (!mBluetoothAdapter.isEnabled()) {
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
// Otherwise, setup the chat session
} else {
if (mChatService == null) setupCommand();
}
}
@Override
public synchronized void onResume() {
super.onResume();
if(D) Log.e(TAG, "+ ON RESUME +");
// 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() == BluetoothService.STATE_NONE) {
// Start the Bluetooth chat services
mChatService.start();
}
}
}
@Override
public synchronized void onPause() {
super.onPause();
if(D) Log.e(TAG, "- ON PAUSE -");
}
@Override
public void onStop() {
super.onStop();
if(D) Log.e(TAG, "-- ON STOP --");
}
@Override
public void onDestroy() {
super.onDestroy();
// Stop the Bluetooth chat services
if (mChatService != null) mChatService.stop();
this.unregisterReceiver(mReceiver);
if(D) Log.e(TAG, "--- ON DESTROY ---");
}
private void setupCommand() {
Log.d(TAG, "setupChat()");
// Initialize the BluetoothService to perform bluetooth connections
mChatService = new BluetoothService(this, mHandler);
// Initialize the buffer for outgoing messages
mOutStringBuffer = new StringBuffer("");
}
private void resultMacId(String address) {
// 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() == BluetoothService.STATE_NONE) {
// Start the Bluetooth chat services
mChatService.start();
}
}
// Get the BLuetoothDevice object
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
// Attempt to connect to the device
mChatService.connect(device, false);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.action_settings:
// Launch the DeviceListActivity to see devices and do scan
return true;
}
return false;
}
// The Handler that gets information back from the BluetoothChatService
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MESSAGE_STATE_CHANGE:
if(D) Log.i(TAG, "MESSAGE_STATE_CHANGE: " + msg.arg1);
switch (msg.arg1) {
case BluetoothService.STATE_CONNECTED:
statuses.setText("connected to :"+mConnectedDeviceName);
// mTitle.setText(R.string.title_connected_to);
//mTitle.append(mConnectedDeviceName);
//mConversationArrayAdapter.clear();
break;
case BluetoothService.STATE_CONNECTING:
statuses.setText("connecting ... ");
// mTitle.setText(R.string.title_connecting);
break;
case BluetoothService.STATE_LISTEN:
case BluetoothService.STATE_NONE:
statuses.setText("Not Connected");
// mTitle.setText(R.string.title_not_connected);
break;
}
break;
case MESSAGE_WRITE:
byte[] writeBuf = (byte[]) msg.obj;
// construct a string from the buffer
String writeMessage = new String(writeBuf);
Log.d(TAG, "MESSAGE_WRITE++++++++"+writeMessage);
//mConversationArrayAdapter.add("Me: " + writeMessage);
break;
case 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);
Log.d(TAG, "MESSAGE_READ++++++++"+readMessage);
// mConversationArrayAdapter.add(mConnectedDeviceName+": " + readMessage);
break;
case MESSAGE_DEVICE_NAME:
// save the connected device's name
mConnectedDeviceName = msg.getData().getString(DEVICE_NAME);
statuses.setText("Connected to "+ mConnectedDeviceName);
Toast.makeText(getApplicationContext(), "Connected to "
+ mConnectedDeviceName, Toast.LENGTH_SHORT).show();
connectIt.setText("Connected to "+ mConnectedDeviceName);
connectIt.setEnabled(false);
break;
case MESSAGE_TOAST:
statuses.setText(msg.getData().getString(TOAST));
Toast.makeText(getApplicationContext(), msg.getData().getString(TOAST),
Toast.LENGTH_SHORT).show();
break;
}
}
};
/**
* Sends a message.
* @param message A string of text to send.
*/
private void sendMessage(byte[] message) {
// Check that we're actually connected before trying anything
if (mChatService.getState() != BluetoothService.STATE_CONNECTED) {
Toast.makeText(this, "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
mChatService.write(message);
// Reset out string buffer to zero and clear the edit text field
//mOutStringBuffer.setLength(0);
//mOutEditText.setText(mOutStringBuffer);
}
}
private void btOnOffClick() {
if (D)
Log.d(TAG, "BT status @ btOnOffClick() ->" + isBTOnOrOff);
if (isBTOnOrOff) {
// make BT off & set isBTOnOrOff to false
btOFF();
isBTOnOrOff = false;
} else if (!isBTOnOrOff) {
// make BT on & set isBTOnOrOff to true
btON(REQUEST_ENABLE_BT);
isBTOnOrOff = true;
}
}
private void btOFF() {
enableDissableViews(false);
if (D)
Log.d(TAG, "BT status @ btOFF() -> OFF");
mBluetoothAdapter.disable();
bt_on_off.setText(getResources().getString(R.string.on_off_status)
+ "OFF");
}
private void btON(int requestType) {
if (D)
Log.d(TAG, "BT status @ btON() -> Turning on dialog");
Intent enableBtIntent = new Intent(
BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, requestType);
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (D)
Log.d(TAG, "onActivityResult " + resultCode);
switch (requestCode) {
case REQUEST_ENABLE_BT:
// When the request to enable Bluetooth returns
if (resultCode == Activity.RESULT_OK) {
// Bluetooth is now enabled,
isBTOnOrOff=true;
enableDissableViews(true);
bt_on_off.setText(getResources().getString(
R.string.on_off_status)
+ "ON");
if (D)
Log.d(TAG, "onActivityResult - status ON ");
} else {
isBTOnOrOff=false;
enableDissableViews(false);
bt_on_off.setText(getResources().getString(
R.string.on_off_status)
+ "OFF");
if (D)
Log.d(TAG, "onActivityResult - BT not enabled");
// User did not enable Bluetooth or an error occurred
}
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.bt_on_off:
if (D)
Log.d(TAG, "...........ON OFF button clicked ........ ");
// check for BT adaptor available then check its on or off
try {
if (D)
Log.d(TAG, "Before sleep");
// Thread.sleep(SLEEP_THREAD_FOR_ACTION);
if (D)
Log.d(TAG, "after sleep");
btOnOffClick();
if (D)
Log.d(TAG, "after btn click completed");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case R.id.connect:
resultMacId("00:08:F4:00:12:A4");
break;
case R.id.click:
sendMessage("commands in bytes".getBytes());
break;
default:
break;
}
}
private void disconnectIt() {
if (mChatService != null) mChatService.stop();
connectIt.setEnabled(true);
}
void enableDissableViews(boolean state)
{
if (!state) {
connectIt.setText("Not Connected");
}
connectIt.setEnabled(state);
}
}
<强> activity_main.xml中
<LinearLayout
android:id="@+id/top"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#bababa"
android:gravity="center" >
<Button
android:id="@+id/bt_on_off"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:layout_weight="1"
android:text="@string/on_off_status" />
<TextView
android:id="@+id/statuses"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center_horizontal"
android:text="@string/all_status"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#FF0000" />
<Button
android:id="@+id/connect"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:layout_weight="1"
android:text="@string/socket_connected_status" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/top"
android:layout_weight="1" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" >
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/TextView01"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="GPS"
android:textAppearance="?android:attr/textAppearanceLarge"
android:visibility="gone" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/click"
android:layout_width="317dp"
android:layout_height="match_parent"
android:text="Send" />
</LinearLayout>
</LinearLayout>