英文:
How to solve "Is not an enclosing class error"when get data from Arduino
问题
我正在尝试实现一个线程来从我的Arduino设备获取数据。在另一个函数（manageMyConnectedSocket(BluetoothSocket mmSocket)）中创建这个线程以供使用会导致“不是封闭类”的错误。当我将线程设置为“static”以解决此问题时，我的Handler开始出现问题，“非静态字段'Handler'无法从静态上下文引用”。谢谢您的帮助！
public static class MyBluetoothService {
private static final String TAG = "MY_APP_DEBUG_TAG";
private Handler handler; // 从蓝牙服务获取信息的处理程序
// 在服务和UI之间传递消息时使用的常量
private interface MessageConstants {
public static final int MESSAGE_READ = 0;
public static final int MESSAGE_WRITE = 1;
public static final int MESSAGE_TOAST = 2;
// ...（根据需要添加其他消息类型。）
}
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
private byte[] mmBuffer; // 用于存储流的mmBuffer
public ConnectedThread(BluetoothSocket socket) {
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// 获取输入和输出流；使用临时对象，因为成员流是final的。
try {
tmpIn = socket.getInputStream();
} catch (IOException e) {
Log.e(TAG, "创建输入流时出错", e);
}
try {
tmpOut = socket.getOutputStream();
} catch (IOException e) {
Log.e(TAG, "创建输出流时出错", e);
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
mmBuffer = new byte[1024];
int numBytes; // 从read()返回的字节
// 保持监听InputStream，直到发生异常。
while (true) {
try {
// 从InputStream读取。
numBytes = mmInStream.read(mmBuffer);
// 将获取到的字节发送到UI活动。
Message readMsg = handler.obtainMessage(
MessageConstants.MESSAGE_READ, numBytes, -1,
mmBuffer);
readMsg.sendToTarget();
} catch (IOException e) {
Log.d(TAG, "InputStream已断开连接", e);
break;
}
}
}
// 从主活动调用此方法将数据发送到远程设备。
public void write(byte[] bytes) {
try {
mmOutStream.write(bytes);
// 将已发送的消息与UI活动共享。
Message writtenMsg = handler.obtainMessage(
MessageConstants.MESSAGE_WRITE, -1, -1, mmBuffer);
writtenMsg.sendToTarget();
} catch (IOException e) {
Log.e(TAG, "发送数据时出错", e);
// 向活动发送发送失败消息。
Message writeErrorMsg =
handler.obtainMessage(MessageConstants.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString("toast",
"无法将数据发送到其他设备");
writeErrorMsg.setData(bundle);
handler.sendMessage(writeErrorMsg);
}
}
// 从主活动调用此方法关闭连接。
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "无法关闭连接套接字", e);
}
}
}
}
//***管理已连接套接字******管理已连接套接字******管理已连接套接字******管理已连接套接字******管理已连接套接字***
private void manageMyConnectedSocket(BluetoothSocket mmSocket) {
Log.println(Log.ERROR,"DEV","我在manageMyConnectedSocket方法中，似乎很有趣");
MyBluetoothService.ConnectedThread dataThread = new MyBluetoothService.ConnectedThread(mmSocket);
dataThread.start();
}
英文:
I am trying to implement a thread to get data from my arduino device. Creating this thread in another function(manageMyConnectedSocket(BluetoothSocket mmSocket)) to use causes "Is not an enclosing class" error. When i make the thread "static" to solve this problem my Handler starts causing problem "non-static field 'Handler' cannot be referenced from a static context" Thank you for your help!
public static class MyBluetoothService {
private static final String TAG = "MY_APP_DEBUG_TAG";
private Handler handler; // handler that gets info from Bluetooth service
// Defines several constants used when transmitting messages between the
// service and the UI.
private interface MessageConstants {
public static final int MESSAGE_READ = 0;
public static final int MESSAGE_WRITE = 1;
public static final int MESSAGE_TOAST = 2;
// ... (Add other message types here as needed.)
}
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
private byte[] mmBuffer; // mmBuffer store for the stream
public ConnectedThread(BluetoothSocket socket) {
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the input and output streams; using temp objects because
// member streams are final.
try {
tmpIn = socket.getInputStream();
} catch (IOException e) {
Log.e(TAG, "Error occurred when creating input stream", e);
}
try {
tmpOut = socket.getOutputStream();
} catch (IOException e) {
Log.e(TAG, "Error occurred when creating output stream", e);
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
mmBuffer = new byte[1024];
int numBytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs.
while (true) {
try {
// Read from the InputStream.
numBytes = mmInStream.read(mmBuffer);
// Send the obtained bytes to the UI activity.
Message readMsg = handler.obtainMessage(
MessageConstants.MESSAGE_READ, numBytes, -1,
mmBuffer);
readMsg.sendToTarget();
} catch (IOException e) {
Log.d(TAG, "Input stream was disconnected", e);
break;
}
}
}
// Call this from the main activity to send data to the remote device.
public void write(byte[] bytes) {
try {
mmOutStream.write(bytes);
// Share the sent message with the UI activity.
Message writtenMsg = handler.obtainMessage(
MessageConstants.MESSAGE_WRITE, -1, -1, mmBuffer);
writtenMsg.sendToTarget();
} catch (IOException e) {
Log.e(TAG, "Error occurred when sending data", e);
// Send a failure message back to the activity.
Message writeErrorMsg =
handler.obtainMessage(MessageConstants.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString("toast",
"Couldn't send data to the other device");
writeErrorMsg.setData(bundle);
handler.sendMessage(writeErrorMsg);
}
}
// Call this method from the main activity to shut down the connection.
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "Could not close the connect socket", e);
}
}
}
}
//***MANAGE CONNECTED SOCKET ******MANAGE CONNECTED SOCKET ******MANAGE CONNECTED SOCKET ******MANAGE CONNECTED SOCKET ******MANAGE CONNECTED SOCKET ***
private void manageMyConnectedSocket(BluetoothSocket mmSocket) {
Log.println(Log.ERROR,"DEV","I AM IN THE MANAGEMYCONNECTEDSOCKET METHOD, SEEMS INTERESTING");
MyBluetoothService.ConnectedThread dataThread= new MyBluetoothService.ConnectedThread(mmSocket);
dataThread.start();
}
专注分享java语言的经验与见解，让所有开发者获益！
评论