BluetoothDevice device = BluetoothAdapter.getRemoteDevice("20:22:06:15:35:96");中的getRemoteDevice报错

getRemoteDevice() 方法会抛出一个受检查异常 BluetoothDeviceNotFoundException，需要进行异常处理。可以使用 try-catch 块或者在方法声明中使用 throws 关键字。例如：

try {
    BluetoothDevice device = BluetoothAdapter.getRemoteDevice("20:22:06:15:35:96");
} catch (BluetoothDeviceNotFoundException e) {
    // 处理异常
}

或者：

public void yourMethod() throws BluetoothDeviceNotFoundException {
    BluetoothDevice device = BluetoothAdapter.getRemoteDevice("20:22:06:15:35:96");
}

需要注意的是，BluetoothAdapter.getRemoteDevice() 方法需要传入一个合法的蓝牙设备地址。如果传入的地址不合法或者设备不可用，会抛出 BluetoothDeviceNotFoundException 异常。

相关问题

import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothSocket; import android.os.Handler; import android.os.Message; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.UUID; public class bluetoothController { private BluetoothAdapter mBluetoothAdapter; private BluetoothSocket mBluetoothSocket; private InputStream mInputStream; private OutputStream mOutputStream; private Handler mHandler; public bluetoothController(Handler handler) { mHandler = handler; mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); } public boolean connect(String address) { BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address); UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); try { mBluetoothSocket = device.createRfcommSocketToServiceRecord(uuid); mBluetoothSocket.connect(); mInputStream = mBluetoothSocket.getInputStream(); mOutputStream = mBluetoothSocket.getOutputStream(); return true; } catch (IOException e) { e.printStackTrace(); return false; } } public void disconnect() { try { mBluetoothSocket.close(); } catch (IOException e) { e.printStackTrace(); } } public void write(byte[] bytes) { try { mOutputStream.write(bytes); } catch (IOException e) { e.printStackTrace(); } } public void read() { byte[] buffer = new byte[1024]; int bytes; while (true) { try { bytes = mInputStream.read(buffer); String message = new String(buffer, 0, bytes); Message msg = mHandler.obtainMessage(0, message); mHandler.sendMessage(msg); } catch (IOException e) { e.printStackTrace(); break; } } } }

这是一个蓝牙控制器的 Java 类，它可以连接到指定的蓝牙设备并发送和接收数据。它使用 BluetoothAdapter、BluetoothDevice 和 BluetoothSocket 类来管理蓝牙连接，使用 InputStream 和 OutputStream 类来读写数据。它还使用 Handler 和 Message 类来处理接收到的数据。如果你有任何关于这个类的问题，可以继续问我。

void bondStateChangeCallback(int status, byte[] address, int newState) { BluetoothDevice device = mRemoteDevices.getDevice(address); if (device == null) { infoLog("No record of the device:" + device); // This device will be added as part of the BONDING_STATE_CHANGE intent processing // in sendIntent above device = mAdapter.getRemoteDevice(Utils.getAddressStringFromByte(address)); } infoLog("bondStateChangeCallback: Status: " + status + " Address: " + device + " newState: " + newState); Message msg = obtainMessage(BONDING_STATE_CHANGE); msg.obj = device; if (newState == BOND_STATE_BONDED) { msg.arg1 = BluetoothDevice.BOND_BONDED; } else if (newState == BOND_STATE_BONDING) { msg.arg1 = BluetoothDevice.BOND_BONDING; } else { msg.arg1 = BluetoothDevice.BOND_NONE; } msg.arg2 = status; sendMessage(msg); }sendMessage(msg);再次发出去是同步还是异步发出去的，如果是异步的话，是否有时序的风险

根据给出的代码片段，sendMessage(msg)方法是在bondStateChangeCallback()回调函数内部调用的。根据Android消息机制，sendMessage()方法通常是异步的，消息会被放入消息队列中，然后在适当的时机被处理。因此，sendMessage()方法的调用是异步的。

关于时序风险，如果在sendMessage()方法调用之后立即对msg进行修改或者释放，则可能存在时序风险。因为消息处理可能会在稍后的时间点才会被执行，而修改或释放msg的操作可能会在消息处理之前发生，导致不一致的结果。为了避免时序风险，应该在sendMessage()之后不要对msg进行修改或释放操作。