【发布时间】：2016-12-15 08:35:57
【问题描述】：
我在将命令从我的 android 设备发送到蓝牙设备时遇到问题。
蓝牙与微控制器相关联。我的努力如下：
public class MainActivity extends AppCompatActivity {
private static final int REQUEST_ENABLE_BT = 2;
private BluetoothAdapter mBluetoothAdapter;
public static final String TAG = "CustomPOC BLEEEEEEE";
private Button btn_send;
private BluetoothDevice mdevice;
private Handler mHandler;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
btn_send = (Button)findViewById(R.id.senddata);
if (mBluetoothAdapter == null) {
Toast.makeText(this, "Bluetooth is not available", Toast.LENGTH_LONG).show();
finish();
return;
}
if (!mBluetoothAdapter.isEnabled()) {
Log.i(TAG, "onClick - BT not enabled yet");
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
}
pairedOrNot();
btn_send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mConnectThread = new ConnectThread(mdevice);
mConnectThread.start();
// new ConnectAsynk(mdevice).execute();
}
});
}
private void pairedOrNot() {
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
List<String> s = new ArrayList<String>();
for(BluetoothDevice bt : pairedDevices) {
s.add(bt.getAddress());
s.add(bt.getName());
if("08:7C:BE:00:00:01".equals(bt.getAddress())) {
mdevice = bt;
}
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case REQUEST_ENABLE_BT:
// When the request to enable Bluetooth returns
if (resultCode == Activity.RESULT_OK) {
Toast.makeText(this, "Bluetooth has turned on ", Toast.LENGTH_SHORT).show();
} else {
// User did not enable Bluetooth or an error occurred
Log.d(TAG, "BT not enabled");
Toast.makeText(this, "Problem in BT Turning ON ", Toast.LENGTH_SHORT).show();
finish();
}
break;
default:
Log.e(TAG, "wrong request code");
break;
}
}
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
private final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");
public ConnectThread(BluetoothDevice device) {
BluetoothSocket tmp = null;
mmDevice = device;
try {
tmp = device.createInsecureRfcommSocketToServiceRecord(MY_UUID);
/*Method m = mmDevice.getClass().getMethod("createRfcommSocket", new Class[] {int.class});
tmp = (BluetoothSocket) m.invoke(device, 1);*/
System.out.println("BTTTTTTTTTTT Address "+mmDevice.getAddress());
BluetoothDevice hxm = BluetoothAdapter.getDefaultAdapter().getRemoteDevice(mmDevice.getAddress());
// Method m;
// m = hxm.getClass().getMethod("createRfcommSocket", new Class[]{int.class});
// tmp = (BluetoothSocket)m.invoke(hxm, Integer.valueOf(1));
}
catch (Exception e){
e.printStackTrace();
}
mmSocket = tmp;
}
public void run() {
mBluetoothAdapter.cancelDiscovery();
try {
mmSocket.connect();
// Reset the ConnectThread because we're done
synchronized (MainActivity.this) {
mConnectThread = null;
}
// Cancel the thread that completed the connection
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
ConnectedThread mConnectedThread = new ConnectedThread(mmSocket);
mConnectedThread.start();
} catch (IOException connectException) {
try {
connectException.printStackTrace();
mmSocket.close();
} catch (IOException closeException) { }
} catch (Exception ex){
ex.printStackTrace();
}
}
public void cancel(){
try {
mmSocket.close();
} catch (IOException e) { e.printStackTrace();}
}
}
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) { e.printStackTrace();}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer = new byte[1024];
int begin = 0;
int bytes = 0;
while (true) {
try {
bytes += mmInStream.read(buffer, bytes, buffer.length - bytes);
for(int i = begin; i < bytes; i++) {
if(buffer[i] == "1010101100000001000000100000000100001110".getBytes()[0]) {
mHandler.obtainMessage(1, begin, i, buffer).sendToTarget();
begin = i + 1;
if(i == bytes - 1) {
bytes = 0;
begin = 0;
}
}
}
} catch (IOException e) {
e.printStackTrace();
break;
}
}
}
public void write(byte[] bytes) {
try {
mmOutStream.write(bytes);
} catch (IOException e) {
e.printStackTrace();
}
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
当我通过
检查连接状态时，很少有提示tmp.isConnected()
我发现它正在返回一个
假的
价值。
我想将此命令（1010101100000001000000010000000100001110）发送到外部蓝牙。但我遇到了问题。应用程序启动时的日志跟踪如下：
08-17 07:48:39.718: W/art(14551): Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.
drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList,
android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
当点击按钮 btn_send 时，我在日志跟踪中收到以下消息：
08-17 07:51:32.046: W/BluetoothAdapter(14984): getBluetoothService() called with no BluetoothManagerCallback
08-17 07:51:38.448: W/System.err(14984): java.io.IOException: read failed, socket might closed or timeout, read ret: -1
08-17 07:51:38.449: W/System.err(14984): at android.bluetooth.BluetoothSocket.readAll(BluetoothSocket.java:573)
08-17 07:51:38.449: W/System.err(14984): at android.bluetooth.BluetoothSocket.readInt(BluetoothSocket.java:584)
08-17 07:51:38.449: W/System.err(14984): at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:321)
08-17 07:51:38.449: W/System.err(14984): at com.mahmad.custompoc11aug.MainActivity$ConnectThread.run(MainActivity.java:164)
调试后我发现问题出在这一行
mmSocket.connect();
清单文件中提供了所有必需的权限。请帮我解决这个问题。提前致谢。
【问题讨论】：
-
您附加的 logcat 输出是无关紧要的，因为在您的代码中，所有异常都被“沉默”了——您捕获它们并且什么都不做。捕获异常时您必须做的最低限度是记录它（例如
e.printStackTrace()）。请重新运行您的代码并记录所有异常，然后我们可能会为您提供帮助 -
问题已更新。请检查一下。
-
再一次 - 你怎么知道一路上没有抛出异常？抛出异常是为了通知您出现问题，但您只是忽略它们。将
e.printStackTrace()添加到所有catch子句并发布整个logcat 输出。 -
感谢您的回复，但上面发布的日志跟踪仅显示在 Studio 跟踪中。但调试后我在“mmSocket.connect();”行中发现了问题。请帮助我，否则任何建议都会很重要。
-
请注意 - 我正在使用“RS232 传输协议：1200, N, 8, 1”。