问题描述
我编写了一个 Android 应用程序，它应该通过蓝牙模块将数据发送到 Arduino hc-06 传感器以控制汽车。蓝牙连接正常。
我只想向 arduino 发送信号，例如当我按下右侧的按钮时。
我想写这样的东西：
customButtonRight.setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Bluetooth.sendValue("R");
}
});
接收信号的arduino代码部分：
if(mySerial.available() > 0) // Send data only when you receive data:
{
data = mySerial.read(); //Read the incoming data and store it into variable data
Serial.print(data); //Print Value inside data in Serial monitor
Serial.print("\n"); //New line
switch(data)
{
case 'F':
digitalWrite(led_galben_fata,HIGH);
digitalWrite(led_rosu_spate,LOW);
digitalWrite(led_albastru_stanga,LOW);
digitalWrite(led_alb_dreapta,LOW);
break;
case 'B':
digitalWrite(led_rosu_spate,HIGH);
digitalWrite(led_galben_fata,LOW);
break;
case 'L':
digitalWrite(led_albastru_stanga,LOW);
digitalWrite(led_rosu_spate,LOW);
break;
case 'R':
digitalWrite(led_alb_dreapta,HIGH);
digitalWrite(led_galben_fata,LOW);
break;
case 'G': //// fata stanga
digitalWrite(led_galben_fata,HIGH);
digitalWrite(led_albastru_stanga,HIGH);
digitalWrite(led_rosu_spate,LOW);
break;
case 'I': ///// fata dreapta
digitalWrite(led_galben_fata,HIGH);
digitalWrite(led_alb_dreapta,LOW);
break;
case 'H': //// spate stanga
digitalWrite(led_rosu_spate,LOW);
break;
case 'J': //// spate dreapta
digitalWrite(led_rosu_spate,LOW);
break;
default:
digitalWrite(led_galben_fata,LOW);
digitalWrite(led_rosu_spate,LOW);
digitalWrite(led_albastru_stanga,LOW);
digitalWrite(led_alb_dreapta,LOW);
}
}
这是我关于我的 android 活动的完整代码：
public class MonitoringScreen extends Activity {
private static String LOG_TAG = "UIElementsPracticeLog";
private static final String TAG = "BlueTest5-MainActivity";
private int mMaxChars = 50000;//Default
private UUID mDeviceUUID;
private BluetoothSocket mBTSocket;
private ReadInput mReadThread = null;
private boolean mIsUserInitiateddisconnect = false;
private boolean mIsBluetoothConnected = false;
private BluetoothDevice mDevice;
private ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_monitoring_screen);
ActivityHelper.initialize(this);
Intent intent = getIntent();
Bundle b = intent.getExtras();
mDevice = b.getParcelable(MainActivity.DEVICE_EXTRA);
mDeviceUUID = UUID.fromString(b.getString(MainActivity.DEVICE_UUID));
mMaxChars = b.getInt(MainActivity.BUFFER_SIZE);
Button customButtonDown = findViewById(R.id.custom_button_down);
Button customButtonUp = findViewById(R.id.custom_button_up);
Button customButtonLeft = findViewById(R.id.custom_button_left);
Button customButtonRight = findViewById(R.id.custom_button_right);
customButtonDown.setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.i(LOG_TAG,"Down-Arrow button is pressed by user");
}
});
customButtonUp.setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.i(LOG_TAG,"Up-Arrow button is pressed by user");
}
});
customButtonLeft.setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.i(LOG_TAG,"Left-Arrow button is pressed by user");
}
});
customButtonRight.setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.i(LOG_TAG,"Right-Arrow button is pressed by user");
}
});
}
private class ReadInput implements Runnable {
private boolean bStop = false;
private Thread t;
public Readinput() {
t = new Thread(this,"Input Thread");
t.start();
}
public boolean isRunning() {
return t.isAlive();
}
@Override
public void run() {
InputStream inputStream;
try {
inputStream = mBTSocket.getInputStream();
while (!bStop) {
byte[] buffer = new byte[256];
if (inputStream.available() > 0) {
inputStream.read(buffer);
int i = 0;
/*
* This is needed because new String(buffer) is taking the entire buffer i.e. 256 chars on Android 2.3.4 http://stackoverflow.com/a/8843462/1287554
*/
for (i = 0; i < buffer.length && buffer[i] != 0; i++) {
}
final String strInput = new String(buffer,i);
/*
* If checked then receive text,better design would probably be to stop thread if unchecked and free resources,but this is a quick fix
*/
}
Thread.sleep(500);
}
} catch (IOException e) {
// Todo Auto-generated catch block
e.printstacktrace();
} catch (InterruptedException e) {
// Todo Auto-generated catch block
e.printstacktrace();
}
}
public void stop() {
bStop = true;
}
}
private class disConnectBT extends AsyncTask<Void,Void,Void> {
@Override
protected void onPreExecute() {
}
@Override
protected Void doInBackground(Void... params) {
if (mReadThread != null) {
mReadThread.stop();
while (mReadThread.isRunning())
; // Wait until it stops
mReadThread = null;
}
try {
mBTSocket.close();
} catch (IOException e) {
// Todo Auto-generated catch block
e.printstacktrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
mIsBluetoothConnected = false;
if (mIsUserInitiateddisconnect) {
finish();
}
}
}
private void msg(String s) {
Toast.makeText(getApplicationContext(),s,Toast.LENGTH_SHORT).show();
}
@Override
protected void onPause() {
if (mBTSocket != null && mIsBluetoothConnected) {
new disConnectBT().execute();
}
Log.d(TAG,"Paused");
super.onPause();
}
@Override
protected void onResume() {
if (mBTSocket == null || !mIsBluetoothConnected) {
new ConnectBT().execute();
}
Log.d(TAG,"Resumed");
super.onResume();
}
@Override
protected void onStop() {
Log.d(TAG,"Stopped");
super.onStop();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
// Todo Auto-generated method stub
super.onSaveInstanceState(outState);
}
private class ConnectBT extends AsyncTask<Void,Void> {
private boolean mConnectSuccessful = true;
@Override
protected void onPreExecute() {
progressDialog = ProgressDialog.show(MonitoringScreen.this,"Hold on","Connecting");// http://stackoverflow.com/a/11130220/1287554
}
@Override
protected Void doInBackground(Void... devices) {
try {
if (mBTSocket == null || !mIsBluetoothConnected) {
mBTSocket = mDevice.createInsecureRfcommSocketToServiceRecord(mDeviceUUID);
BluetoothAdapter.getDefaultAdapter().canceldiscovery();
mBTSocket.connect();
}
} catch (IOException e) {
// Unable to connect to device
e.printstacktrace();
mConnectSuccessful = false;
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (!mConnectSuccessful) {
Toast.makeText(getApplicationContext(),"Could not connect to device. Is it a Serial device? Also check if the UUID is correct in the settings",Toast.LENGTH_LONG).show();
finish();
} else {
msg("Connected to device");
mIsBluetoothConnected = true;
mReadThread = new Readinput(); // Kick off input reader
}
progressDialog.dismiss();
}
}
}
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
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