我想使用从Arduino发送到Android的数据。我可以将两者连接在一起并在屏幕上显示传入的数据。但是，当我想使用传入的数据来设置注释时，这似乎不起作用。那么如何从传入数据中获取值呢？
String address1 = ("98:D3:81:FD:4B:87");
String name1 = ("Sensor_Shoe");
@SuppressLint("HandlerLeak")
protected void bluetoothconnect() {
btEnablingIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
requestCodeForEnable=1;
if (myBluetoothAdapter==null){
Toast.makeText(getApplicationContext(),"Bluetooth not supported", Toast.LENGTH_LONG).show();
} else {
if (!myBluetoothAdapter.isEnabled()) {
startActivityForResult(btEnablingIntent, requestCodeForEnable);
}
if (myBluetoothAdapter.isEnabled()) {
myBluetoothAdapter.disable();
Toast.makeText(getApplicationContext(),"Bluetooth disabled",Toast.LENGTH_SHORT).show();
TextView input1 = findViewById(R.id.input1); input1.setVisibility(View.INVISIBLE);
ImageButton btn_bluetooth = findViewById(R.id.btn_bluetooth); btn_bluetooth.setBackgroundColor(getResources().getColor(R.color.transparent));
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
if(requestCode==requestCodeForEnable){
ImageButton btn_bluetooth = findViewById(R.id.btn_bluetooth);
if(resultCode==RESULT_OK){
Toast.makeText(getApplicationContext(),"Bluetooth enabled",Toast.LENGTH_SHORT).show();
TextView input1 = findViewById(R.id.input1); input1.setVisibility(View.VISIBLE);
btn_bluetooth.setBackgroundColor(getResources().getColor(R.color.colorAccent));
createsocket();
}
else if(resultCode==RESULT_CANCELED){
Toast.makeText(getApplicationContext(),"Bluetooth enabling cancelled",Toast.LENGTH_SHORT).show();
TextView input1 = findViewById(R.id.input1); input1.setVisibility(View.INVISIBLE);
btn_bluetooth.setBackgroundColor(getResources().getColor(R.color.transparent));
}
}
}
protected void createsocket() {
new Thread() {
public void run() {
boolean fail = false;
BluetoothDevice device = myBluetoothAdapter.getRemoteDevice(address1);
try {
BTSocket = createBluetoothSocket(device);
} catch (IOException e) {
fail = true;
Toast.makeText(getBaseContext(), "Socket creation failed", Toast.LENGTH_SHORT).show();
}
// Establish the Bluetooth socket connection.
try {
BTSocket.connect();
} catch (IOException e) {
try {
fail = true;
BTSocket.close();
BTHandler.obtainMessage(CONNECTING_STATUS, -1, -1)
.sendToTarget();
} catch (IOException e2) {
//insert code to deal with this
Toast.makeText(getBaseContext(), "Socket creation failed", Toast.LENGTH_SHORT).show();
}
}
if (!fail) {
mConnectedThread = new ConnectedThread(BTSocket);
mConnectedThread.start();
BTHandler.obtainMessage(CONNECTING_STATUS, 1, -1, name1)
.sendToTarget();
}
}
}.start();
}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
try {
final Method m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", UUID.class);
return (BluetoothSocket) m.invoke(device, PORT_UUID);
} catch (Exception e) {
Log.e(TAG, "Could not create Insecure RFComm Connection",e);
}
return device.createRfcommSocketToServiceRecord(PORT_UUID);
}
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
public ConnectedThread(BluetoothSocket socket) {
mmSocket = socket;
InputStream tmpIn = null;
// Get the input and output streams, using temp objects because
// member streams are final
try {
tmpIn = socket.getInputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
}
public void run() {
byte[] buffer = new byte[1024]; // buffer store for the stream
int bytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.available();
if(bytes != 0) {
buffer = new byte[1024];
SystemClock.sleep(100); //pause and wait for rest of data. Adjust this depending on your sending speed.
bytes = mmInStream.available(); // how many bytes are ready to be read?
bytes = mmInStream.read(buffer, 0, bytes); // record how many bytes we actually read
BTHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer)
.sendToTarget(); // Send the obtained bytes to the UI activity
}
} catch (IOException e) {
e.printStackTrace();
break;
}
}
}
}
这就是我进行连接的方式，这似乎正常工作。比起我下面的代码来读取传入的数据。
BTHandler = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == MESSAGE_READ) {
String readMessage = " ";
try {
readMessage = new String((byte[]) msg.obj, "UTF-8");
inputdata1 = readMessage;
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
TextView input1 = findViewById(R.id.input1);
input1.setText(readMessage);
if (readMessage.equals("X")){
Vibrator vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vibrator.vibrate(100);
}
}
}
};
在textview中显示传入的数据。但是它无法识别传入数据中的X。但是，我可以在textView中看到该数据，并且确实以arduino代码发送了该数据。
if (fsrReadingHeel >= (fsrReadingHeelOld + 800)){
Serial.println("X");
}
我确实知道代码已被处理，因为当我说if（！（readMessage.equals（“ X”）））{时，它确实会振动。
答案 0 :(得分：0)
Arduinos Serial.print以ASCII发送。当您构建一个String时，您可以像这样使用ASCII：Charset.setName（“ ASCII”）而不只是“ UTF-8”。这对我来说很好（使用Arduino Uno和HC-06蓝牙模块）：
readMessage = new String((byte[]) msg.obj, Charset.setName("ASCII"));
从byteBuffer创建的字符串应限制为实际数据的大小-您可以为此使用substring（0，sizeOfData）。
当我使我的应用程序与Arduino Uno连接时，我遇到了问题，即根据配置，它忽略了Android中第一个发送的字节，因此尝试发送更长的字符串，看看是否有东西，那您实际上可以正确阅读。 我建议您使用Serial.print而不是println，因为在发送时不需要换行。它还可能会更改您在Android上收到的消息。
if (fsrReadingHeel >= (fsrReadingHeelOld + 800)){
Serial.print("X");
}
您也可以改用Serial.write，但不需要-在这里查看差异：https://arduino.stackexchange.com/questions/10088/what-is-the-difference-between-serial-write-and-serial-print-and-when-are-they