Questa piccola applicazione interfaccia i sensori di Android con un PC mediante Bluetooth.
In pratica viene avviata una connessione BT tra PC ed telefono e vengono passati i valori di azimuth, pitch e roll del telefono; dopo aver inviato la prima terna di valore il socket viene interrotto
Importanti: i due dispositivi devono essere gia' stati accoppiati in precedenza ed il BT deve essere gia' abilitato sul telefono
Lato Android
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package com.luca.innocenti.btsensors;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Set;
import java.util.Timer;
import java.util.TimerTask;
import java.util.UUID;
import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.Fragment;
import android.annotation.SuppressLint;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.hardware.Sensor;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.hardware.SensorEvent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.TextView;
@SuppressLint("NewApi")
public class MainActivity extends ActionBarActivity {
private static final String TAG = "BT";
//Bluetooth
public BluetoothAdapter mBluetoothAdapter;
public BluetoothDevice mmDevice;
public BluetoothSocket mmSocket;
public OutputStream mmOutputStream;
//Sensori
public SensorManager mSensorManager;
public Sensor mSensor;
public double azimuth;
public double pitch;
public double roll;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
//Ricerca BT
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(mBluetoothAdapter == null) {
Log.d(TAG,"No bluetooth adapter available");
}
if(!mBluetoothAdapter.isEnabled()) {
startActivityForResult( new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE), 0);
}
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
if(pairedDevices.size() > 0) {
for(BluetoothDevice device : pairedDevices) {
if(device.getName().equals("debian-x40-0")) { //qui si deve mettere il nome BT del PC
Log.d(TAG,device.getName()+" "+device.getAddress() );
mmDevice = device;
break;
}
}
}
//apre connessione
UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb"); //Standard //SerialPortService ID
try {
mmSocket = mmDevice.createInsecureRfcommSocketToServiceRecord(uuid);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
mmSocket.connect();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
mmOutputStream = mmSocket.getOutputStream();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//sensori
mSensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);
mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);
}
private void send_string(final String dati)
{
for (int t=0;t<dati.length();t++)
{
try {
mmOutputStream.write(dati.charAt(t));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private final SensorEventListener mListener = new SensorEventListener() {
//manda una terna di valori pitch,roll ed azimuth e poi termina l'applicazione
public void onSensorChanged(SensorEvent event) {
azimuth = event.values[0];
pitch = event.values[1];
roll = event.values[2];
send_string(Double.toString(azimuth));
send_string("A");
send_string(Double.toString(pitch));
send_string("A");
send_string(Double.toString(roll));
send_string("A");
try {
mmSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//termina l'applicazione dopo la prima lettura
finish();
moveTaskToBack(true);
android.os.Process.killProcess(android.os.Process.myPid());
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub
}
};
@Override
protected void onResume()
{
super.onResume();
mSensorManager.registerListener(mListener, mSensor,SensorManager.SENSOR_DELAY_GAME);
}
@Override
protected void onStop()
{
mSensorManager.unregisterListener(mListener);
super.onStop();
}
@Override
protected void onDestroy()
{
mSensorManager.unregisterListener(mListener);
super.onDestroy();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
}
----------------------------------------------------
Lato PC (Python)
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from bluetooth import *
server_sock=BluetoothSocket( RFCOMM )
server_sock.bind(("",PORT_ANY))
server_sock.listen(1)
port = server_sock.getsockname()[1]
uuid = "00001101-0000-1000-8000-00805F9B34FB"
advertise_service( server_sock, "SampleServer",
service_id = uuid,
service_classes = [ uuid, SERIAL_PORT_CLASS ],
profiles = [ SERIAL_PORT_PROFILE ]
)
client_sock, client_info = server_sock.accept()
misura = ""
try:
while True:
data = client_sock.recv(1024)
if len(data) == 0: break
if data == 'A':
print misura
misura = ""
else:
misura = misura + data
except IOError:
pass
client_sock.close()
server_sock.close()
