Develop Reference

Bluetooth project,when bluetooth is disconnected or out of range

I am trying to program that will display a notification when bluetooth device (arduino uno)disconnected or out of range.
When i testing ,power off the bluetooth device,phone has delay 20s show the notificatoin.
I don't know why,hope somebody help me figure it out.
package com.example.arduinosensors;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;
import java.util.UUID;
import android.app.Activity;
import android.app.AlertDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.Vibrator;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
Button btnOn, btnOff;
TextView txtArduino, txtString, txtStringLength, sensorView0, sensorView1, sensorView2, sensorView3;
Handler bluetoothIn;
public static final int handlerState = 0,MESSAGE_LOST_CONNECT = 1; //used to identify handler message
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private StringBuilder recDataString = new StringBuilder();
private Vibrator mVibrator;
private ConnectedThread mConnectedThread;
// SPP UUID service - this should work for most devices
private static final UUID BTMODULEUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// Insert your bluetooth devices MAC address
private static String address = "20:14:12:03:11:31";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Link the buttons and textViews to respective views
btnOn = (Button) findViewById(R.id.buttonOn);
btnOff = (Button) findViewById(R.id.buttonOff);
txtString = (TextView) findViewById(R.id.txtString);
txtStringLength = (TextView) findViewById(R.id.testView1);
sensorView0 = (TextView) findViewById(R.id.sensorView0);
sensorView1 = (TextView) findViewById(R.id.sensorView1);
sensorView2 = (TextView) findViewById(R.id.sensorView2);
sensorView3 = (TextView) findViewById(R.id.sensorView3);
mVibrator=(Vibrator) getSystemService(VIBRATOR_SERVICE);
bluetoothIn = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == handlerState) { //if message is what we want
String readMessage = (String) msg.obj; // msg.arg1 = bytes from connect thread
recDataString.append(readMessage); //keep appending to string until ~
int endOfLineIndex = recDataString.indexOf("~"); // determine the end-of-line
if (endOfLineIndex > 0) { // make sure there data before ~
String dataInPrint = recDataString.substring(0, endOfLineIndex); // extract string
txtString.setText("Data Received = " + dataInPrint);
int dataLength = dataInPrint.length(); //get length of data received
txtStringLength.setText("String Length = " + String.valueOf(dataLength));
if (recDataString.charAt(0) == '#') //if it starts with # we know it is what we are looking for
{
String sensor0 = recDataString.substring(1, 5); //get sensor value from string between indices 1-5
String sensor1 = recDataString.substring(6, 10); //same again...
String sensor2 = recDataString.substring(11, 15);
String sensor3 = recDataString.substring(16, 20);
sensorView0.setText(" Sensor 0 Voltage = " + sensor0 + "V"); //update the textviews with sensor values
sensorView1.setText(" Sensor 1 Voltage = " + sensor1 + "V");
sensorView2.setText(" Sensor 2 Voltage = " + sensor2 + "V");
sensorView3.setText(" Sensor 3 Voltage = " + sensor3 + "V");
}
recDataString.delete(0, recDataString.length()); //clear all string data
}
}
if(msg.what == MESSAGE_LOST_CONNECT) { //
//Toast.makeText(getApplicationContext(), "", Toast.LENGTH_LONG).show();
mVibrator.vibrate(new long[]{10, 100, 100, 100}, -1);
new AlertDialog.Builder(MainActivity.this)
.setTitle("bluetooth disconnected")
.setIcon(R.drawable.blue1)
.setMessage("bluetooth out of range")
.setPositiveButton("yes", new
DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogInterface, int i)
{
//finish();
}
})
.setNegativeButton("cancel", new
DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialogInterface, int i)
{
}
})
.show();
}
}
};
btAdapter = BluetoothAdapter.getDefaultAdapter(); // get Bluetooth adapter
checkBTState();
btnOff.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mConnectedThread.write("0"); // Send "0" via Bluetooth
Toast.makeText(getBaseContext(), "Turn off LED", Toast.LENGTH_SHORT).show();
}
});
btnOn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mConnectedThread.write("1"); // Send "1" via Bluetooth
Toast.makeText(getBaseContext(), "Turn on LED", Toast.LENGTH_SHORT).show();
}
});
}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
return device.createRfcommSocketToServiceRecord(BTMODULEUUID);
//creates secure outgoing connecetion with BT device using UUID
}
#Override
public void onResume() {
super.onResume();
//Get MAC address from DeviceListActivity via intent
Intent intent = getIntent();
//Get the MAC address from the DeviceListActivty via EXTRA
//address = intent.getStringExtra(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
//create device and set the MAC address
BluetoothDevice device = btAdapter.getRemoteDevice(address);
try {
btSocket = createBluetoothSocket(device);
} catch (IOException e) {
Toast.makeText(getBaseContext(), "Socket creation failed", Toast.LENGTH_LONG).show();
}
// Establish the Bluetooth socket connection.
try
{
btSocket.connect();
} catch (IOException e) {
try
{
btSocket.close();
} catch (IOException e2)
{
//insert code to deal with this
}
}
mConnectedThread = new ConnectedThread(btSocket);
mConnectedThread.start();
//I send a character when resuming.beginning transmission to check device is connected
//If it is not an exception will be thrown in the write method and finish() will be called
mConnectedThread.write("x");
}
#Override
public void onPause()
{
super.onPause();
try
{
//Don't leave Bluetooth sockets open when leaving activity
btSocket.close();
} catch (IOException e2) {
//insert code to deal with this
}
}
//Checks that the Android device Bluetooth is available and prompts to be turned on if off
private void checkBTState() {
if(btAdapter==null) {
Toast.makeText(getBaseContext(), "裝置並不支援藍芽", Toast.LENGTH_LONG).show();
} else {
if (btAdapter.isEnabled()) {
} else {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
}
//create new class for connect thread
private class ConnectedThread extends Thread {
private final InputStream mmInStream;
private final OutputStream mmOutStream;
//creation of the connect thread
public ConnectedThread(BluetoothSocket socket) {
InputStream tmpIn = null;
OutputStream tmpOut = null;
try {
//Create I/O streams for connection
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
private void connectionLost() { //斷線通知副程式
// Send a failure message back to the Activity
Message msg = bluetoothIn.obtainMessage(MainActivity.MESSAGE_LOST_CONNECT);
bluetoothIn.sendMessage(msg);
}
public void run() {
byte[] buffer = new byte[256];
int bytes;
// Keep looping to listen for received messages
while (true) {
try {
bytes = mmInStream.read(buffer); //read bytes from input buffer
String readMessage = new String(buffer, 0, bytes);
// Send the obtained bytes to the UI Activity via handler
bluetoothIn.obtainMessage(handlerState, bytes, -1, readMessage).sendToTarget();
} catch (IOException e) {
connectionLost();
break;
}
}
}
//write method
public void write(String input) {
byte[] msgBuffer = input.getBytes(); //converts entered String into bytes
try {
mmOutStream.write(msgBuffer); //write bytes over BT connection via outstream
} catch (IOException e) {
//if you cannot write, close the application
Toast.makeText(getBaseContext(), "連線失敗", Toast.LENGTH_LONG).show();
finish();
}
}
}
}

Can't Get Android Native Access

Tried using native access to implement a bluetooth functionality in android but on starting the app on a device it seems the native access variable is null. Need help in figuring out why it happened and how to solve it. Thanks
These are my build hints
An example of usage in StateMachine class
BTNative nativeBT = (BTNative)NativeLookup.create(BTNative.class);
#Override
protected void onMain_ScanButtonAction(Component c, ActionEvent event) {
super.onMain_ScanButtonAction(c, event);
try {
if (nativeBT != null && nativeBT.isSupported()) {
try {
nativeBT.findBT();
nativeBT.openBT();
} catch (Throwable t) {
Dialog.show("Error", "Exception during findBT and openBT access: " + t, "OK", null);
}
}else{
Dialog.show("Error", "Can't get native access", "OK", null);
}
} catch (Throwable t) {
Dialog.show("Error", "Exception during native access: " + t, "OK", null);
}
}
NativeImpl
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Set;
import java.util.UUID;
import android.widget.Toast;
public class BTNativeImpl{
//android built in classes for bluetooth operations
BluetoothAdapter mBluetoothAdapter;
BluetoothSocket mmSocket;
BluetoothDevice mmDevice;
//needed for communication to bluetooth device / network
OutputStream mmOutputStream;
InputStream mmInputStream;
Thread workerThread;
byte[] readBuffer;
int readBufferPosition;
volatile boolean stopWorker;
public void closeBT() {
try {
stopWorker = true;
mmOutputStream.close();
mmInputStream.close();
mmSocket.close();
} catch (Exception e) {
e.printStackTrace();
}
}
//this will send text data to be printed by the bluetooth printer
public void sendData(String param){
try {
// the text typed by the user
param += "\n";
mmOutputStream.write(param.getBytes());
// tell the user data were sent
} catch (Exception e) {
e.printStackTrace();
}
}
//this will find a bluetooth printer device
public void findBT() {
try {
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
Toast.makeText(com.codename1.impl.android.AndroidNativeUtil.getActivity(), "No bluetooth adapter available", Toast.LENGTH_LONG).show();
}
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
com.codename1.impl.android.AndroidNativeUtil.getActivity().startActivityForResult(enableBluetooth, 0);
}
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
for (BluetoothDevice device : pairedDevices) {
if (device.getName().equals("BlueTooth Printer")) {
mmDevice = device;
break;
}
}
}
Toast.makeText(com.codename1.impl.android.AndroidNativeUtil.getActivity(), "Bluetooth device found.", Toast.LENGTH_LONG).show();
} catch (Exception e) {
e.printStackTrace();
}
}
public void openBT() {
try {
//Standard SerialPortService ID
UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");
mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
mmSocket.connect();
mmOutputStream = mmSocket.getOutputStream();
mmInputStream = mmSocket.getInputStream();
beginListenForData();
Toast.makeText(com.codename1.impl.android.AndroidNativeUtil.getActivity(), "Bluetooth Opened", Toast.LENGTH_LONG).show();
} catch (Exception e) {
e.printStackTrace();
}
}
public void beginListenForData() {
try {
final Handler handler = new Handler();
//this is the ASCII code for a newline character
final byte delimiter = 10;
stopWorker = false;
readBufferPosition = 0;
readBuffer = new byte[1024];
workerThread = new Thread(new Runnable() {
public void run() {
while (!Thread.currentThread().isInterrupted() && !stopWorker) {
try {
int bytesAvailable = mmInputStream.available();
if (bytesAvailable > 0) {
byte[] packetBytes = new byte[bytesAvailable];
mmInputStream.read(packetBytes);
for (int i = 0; i < bytesAvailable; i++) {
byte b = packetBytes[i];
if (b == delimiter) {
byte[] encodedBytes = new byte[readBufferPosition];
System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
// specify US-ASCII encoding
final String data = new String(encodedBytes, "US-ASCII");
readBufferPosition = 0;
// tell the user data were sent to bluetooth printer device
handler.post(new Runnable() {
public void run() {
Toast.makeText(com.codename1.impl.android.AndroidNativeUtil.getActivity(), data, Toast.LENGTH_LONG).show();
}
});
} else {
readBuffer[readBufferPosition++] = b;
}
}
}
} catch (IOException ex) {
stopWorker = true;
}
}
}
});
workerThread.start();
} catch (Exception e) {
e.printStackTrace();
}
}
public boolean isSupported() {
return true;
}
}

You likely also need BLUETOOTH_ADMIN permission. I'm not sure if that is the only issue, but definitely would cause problems.
From Android's developer guide:
https://developer.android.com/guide/topics/connectivity/bluetooth.html#Permissions
You also made a big mistake in changing the inheritance of the impl class to derive Activity!
You need to create a separate activity class and register it separately as we create the impl class and Android creates the activity class and both are different. I suggest looking at other cn1libs most of which are open source to see how this was done. I also suggest connecting your device with a cable and viewing output in ddms to track issues.

How to receive data over Bluetooth serial port while in background

I have an application that communicates over Bluetooth Serial Port with another terminal. It can send and receive data, more specifically text.
I can send and receive data successfully when the app is on foreground, however, I would like to know how I can make it so the app can receive data when in background and show it in the activity once it comes to foreground.
I'm currently using a service with the doInBackground(). However, I don't know what else I'm missing. Please assist me.
This is my service class
package com.boson.BTComms;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import android.app.Service;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
public class BtService extends Service
{
Bluetooth bt = new Bluetooth();
static ConnectTask cTask;
Bundle bndl;
int action;
public class rxBluetooth
{
public String rxdMsg;
public boolean newData;
public boolean workerStatus;
OutputStream mmOutputStream; // Stream de salida de la conexión
InputStream mmInputStream; // Stream de entrada de la conexión
Thread workerThread; // Thread de escucha
BluetoothSocket mmSocket; // Socket que se utiliza para comunicacion entre los dispositivos Bluetooth
int readBufferPosition = 0; // Variable para bufer de lectura
}
rxBluetooth rxBT = new rxBluetooth();
#Override
public IBinder onBind(Intent intent)
{
return null;
}
public int onStartCommand(Intent intent, int flags, int startId)
{
bndl = intent.getExtras();
action = bndl.getInt("act");
//MAIN SERVICE STATE-MACHINE
switch (action)
{
case 0://Conexión
try
{
String remDev = bndl.getString("_remDev");
cTask = (ConnectTask) new ConnectTask().execute(remDev);
}
catch(Exception e)
{
Toast.makeText(this, "Could not open connection!", Toast.LENGTH_LONG).show();
Intent i = new Intent(getApplicationContext(), HomeActivity.class);
startActivity(i);
}
break;
case 1://Enviar Datos
try
{
if(rxBT.mmSocket != null && rxBT.mmSocket.isConnected() == true)
{
String msg = bndl.getString("_message");
rxBT.mmOutputStream.write(msg.getBytes());
rxBT.mmOutputStream.flush();
}
}
catch(Exception e)
{
Toast.makeText(this, "Could not send data!", Toast.LENGTH_LONG).show();
}
break;
case 2://Cerrar Conexión
rxBT.workerStatus = false;
if (rxBT.mmInputStream != null)
{
try
{
rxBT.mmInputStream.close();
}
catch (Exception e) {Log.e("BOSON", e.getMessage());}
rxBT.mmInputStream = null;
}
if (rxBT.mmOutputStream != null)
{
try
{
rxBT.mmOutputStream.close();
}
catch (Exception e) {Log.e("BOSON", e.getMessage());}
rxBT.mmOutputStream = null;
}
if (rxBT.mmSocket != null)
{
try
{
rxBT.mmSocket.close();
}
catch (Exception e) {Log.e("BOSON", e.getMessage());}
rxBT.mmSocket = null;
}
if (cTask != null)
{
cTask.cancel(true);
cTask = null;
}
break;
}
return startId;
}
private class ConnectTask extends AsyncTask<String, Void, Void>
{
protected Void doInBackground(String... params)
{
try
{
BluetoothDevice mmDevice = bt.btAdpt.getRemoteDevice(params[0]);
try
{
rxBT.mmSocket = mmDevice.createInsecureRfcommSocketToServiceRecord(mmDevice.getUuids()[0].getUuid());
rxBT.mmSocket.connect();
rxBT.mmOutputStream = rxBT.mmSocket.getOutputStream();
rxBT.mmInputStream = rxBT.mmSocket.getInputStream();
Log.e("BOSON", rxBT.mmSocket.getRemoteDevice().toString());
Log.e("BOSON", rxBT.mmOutputStream.toString());
}
catch (IOException e)
{
Log.e("BOSON", "COULD NOT OPEN SOCKET CONNECTION");
}
rxBT.workerStatus = true;
Runnable rbleReceiver = new Runnable()
{
public void run()
{
final byte delimiter = '\r';
final byte[] readBuffer = new byte[1024];
int bytesAvailable;
String rxdMsgT = "";
while(rxBT.workerStatus == true)
{
try
{
if(rxBT.mmInputStream.available() > 0)
{
bytesAvailable = rxBT.mmInputStream.available();
byte[] packetBytes = new byte[bytesAvailable];
rxBT.mmInputStream.read(packetBytes);
for(int i=0;i<bytesAvailable;i++)
{
byte b = packetBytes[i];
if(b == delimiter)
{
byte[] encodedBytes = new byte[rxBT.readBufferPosition];
System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
final String data = new String(encodedBytes, "US-ASCII");
rxBT.readBufferPosition = 0;
rxdMsgT = "Tu: " + data + "\n";
rxBT.newData = true;
if (rxBT.newData == true)
{
Intent intent = new Intent("com.boson.BTComms.MainActivity");
intent.putExtra("Mensaje", rxdMsgT);
sendBroadcast(intent);
rxBT.newData = false;
}
}
else
{
readBuffer[rxBT.readBufferPosition++] = b;
}
}
}
else
{
//Log.e("BOSON", "INACTIVE");
}
}
catch (IOException ex)
{
rxBT.workerStatus = false;
}
}
}
};
rxBT.workerThread = new Thread(rbleReceiver);
rxBT.workerThread.start();
}
catch(Exception e)
{
Toast.makeText(BtService.this, "Could not open connection!", Toast.LENGTH_LONG).show();
Intent i = new Intent(getApplicationContext(), HomeActivity.class);
startActivity(i);
}
return null;
}
}
public void onDestroy()
{
super.onDestroy();
}

android help debugging with Toast

I am trying to debug an app with eclipse. I am using the USB to connect to an accessory so USB in not Available to debug. I am using ADB connect to wirelessly debug, but with this app I have to unplug and plug in USB cable to get app to run and when I do this I lose connection to eclipse.
SO the only thing I can think is to try and use Toast to figure out what is going on in a class.
Maybe there is a better way?
But When I try to call toast app crashes.. I want to be able to toast messages in vaious methods like BroadcastReceiver, and ResumeAccessory
Call anyone tell me how to implement toast in this class?:
//
User must modify the below package with their package name
package com.UARTDemo;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.usb.UsbAccessory;
import android.hardware.usb.UsbManager;
import android.os.Handler;
import android.os.Message;
import android.os.ParcelFileDescriptor;
import android.util.Log;
/******************************FT311 GPIO interface class******************************************/
public class FT311UARTInterface extends Activity
{
private static final String ACTION_USB_PERMISSION = "com.UARTDemo.USB_PERMISSION";
public UsbManager usbmanager;
public UsbAccessory usbaccessory;
public PendingIntent mPermissionIntent;
public ParcelFileDescriptor filedescriptor;
public FileInputStream inputstream;
public FileOutputStream outputstream;
public boolean mPermissionRequestPending = true;
public handler_thread handlerThread;
private byte [] usbdata;
private byte [] writeusbdata;
private byte [] readBuffer; /*circular buffer*/
private int readcount;
private int totalBytes;
private int writeIndex;
private int readIndex;
private byte status;
private byte maxnumbytes = (byte)64;
public boolean datareceived = false;
/*constructor*/
public FT311UARTInterface(Context context){
super();
/*shall we start a thread here or what*/
usbdata = new byte[64];
writeusbdata = new byte[64];
/*128(make it 256, but looks like bytes should be enough)*/
readBuffer = new byte [maxnumbytes];
readIndex = 0;
writeIndex = 0;
/***********************USB handling******************************************/
usbmanager = (UsbManager) context.getSystemService(Context.USB_SERVICE);
// Log.d("LED", "usbmanager" +usbmanager);
mPermissionIntent = PendingIntent.getBroadcast(context, 0, new Intent(ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
filter.addAction(UsbManager.ACTION_USB_ACCESSORY_DETACHED);
context.registerReceiver(mUsbReceiver, filter);
inputstream = null;
outputstream = null;
}
/*reset method*/
public void Reset()
{
/*create the packet*/
writeusbdata[0] = 0x49;
writeusbdata[1] = 0x00;
writeusbdata[2] = 0x00;
writeusbdata[3] = 0x00;
/*send the packet over the USB*/
SendPacket(4);
}
public void SetConfig(int baud, byte dataBits, byte stopBits,
byte parity, byte flowControl)
{
/*prepare the baud rate buffer*/
writeusbdata[0] = (byte)baud;
writeusbdata[1] = (byte)(baud >> 8);
writeusbdata[2] = (byte)(baud >> 16);
writeusbdata[3] = (byte)(baud >> 24);
/*data bits*/
writeusbdata[4] = dataBits;
/*stop bits*/
writeusbdata[5] = stopBits;
/*parity*/
writeusbdata[6] = parity;
/*flow control*/
writeusbdata[7] = flowControl;
/*send the UART configuration packet*/
SendPacket((int)8);
}
/*write data*/
public byte SendData(byte numBytes, char[] buffer)
{
status = 0x00; /*success by default*/
/*
* if num bytes are more than maximum limit
*/
if(numBytes < 1){
/*return the status with the error in the command*/
return status;
}
/*check for maximum limit*/
if(numBytes > 64){
numBytes = 64;
}
/*prepare the packet to be sent*/
for(int count = 0;count<numBytes;count++)
{
writeusbdata[count] = (byte)buffer[count];
}
SendPacket((int)numBytes);
return status;
}
/*read data*/
public byte ReadData(byte numBytes,char[] buffer, byte [] actualNumBytes)
{
status = 0x00; /*success by default*/
/*should be at least one byte to read*/
if((numBytes < 1) || (totalBytes == 0)){
actualNumBytes[0] = 0x00;
return status;
}
/*check for max limit*/
if(numBytes > 64){
numBytes = 64;
}
if(numBytes > 64){
numBytes = 64;
}
if(numBytes > totalBytes)
numBytes = (byte)totalBytes;
/*update the number of bytes available*/
totalBytes -= numBytes;
actualNumBytes[0] = numBytes;
/*copy to the user buffer*/
for(int count = 0; count<numBytes;count++)
{
buffer[count] = (char)readBuffer[readIndex];
readIndex++;
/*shouldnt read more than what is there in the buffer,
* so no need to check the overflow
*/
readIndex %= maxnumbytes;
}
return status;
}
/*method to send on USB*/
private void SendPacket(int numBytes)
{
try {
if(outputstream != null){
outputstream.write(writeusbdata, 0,numBytes);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/*resume accessory*/
public void ResumeAccessory()
{
// Intent intent = getIntent();
if (inputstream != null && outputstream != null) {
return;
}
UsbAccessory[] accessories = usbmanager.getAccessoryList();
UsbAccessory accessory = (accessories == null ? null : accessories[0]);
if (accessory != null) {
if (usbmanager.hasPermission(accessory)) {
OpenAccessory(accessory);
}
else
{
synchronized (mUsbReceiver) {
if (!mPermissionRequestPending) {
usbmanager.requestPermission(accessory,
mPermissionIntent);
mPermissionRequestPending = true;
}
}
}
} else {}
}
/*destroy accessory*/
public void DestroyAccessory(){
unregisterReceiver(mUsbReceiver);
CloseAccessory();
}
/*********************helper routines*************************************************/
public void OpenAccessory(UsbAccessory accessory)
{
filedescriptor = usbmanager.openAccessory(accessory);
if(filedescriptor != null){
usbaccessory = accessory;
FileDescriptor fd = filedescriptor.getFileDescriptor();
inputstream = new FileInputStream(fd);
outputstream = new FileOutputStream(fd);
/*check if any of them are null*/
if(inputstream == null || outputstream==null){
return;
}
}
handlerThread = new handler_thread(handler, inputstream);
handlerThread.start();
}
private void CloseAccessory()
{
try{
if(filedescriptor != null)
filedescriptor.close();
}catch (IOException e){}
try {
if(inputstream != null)
inputstream.close();
} catch(IOException e){}
try {
if(outputstream != null)
outputstream.close();
}catch(IOException e){}
/*FIXME, add the notfication also to close the application*/
filedescriptor = null;
inputstream = null;
outputstream = null;
System.exit(0);
}
/***********USB broadcast receiver*******************************************/
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver()
{
#Override
public void onReceive(Context context, Intent intent)
{
String action = intent.getAction();
if (ACTION_USB_PERMISSION.equals(action))
{
synchronized (this)
{
UsbAccessory accessory = (UsbAccessory) intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false))
{
OpenAccessory(accessory);
}
else
{
Log.d("LED", "permission denied for accessory "+ accessory);
}
mPermissionRequestPending = false;
}
}
else if (UsbManager.ACTION_USB_ACCESSORY_DETACHED.equals(action))
{
UsbAccessory accessory = (UsbAccessory)intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
if (accessory != null )//&& accessory.equals(usbaccessory))
{
CloseAccessory();
}
}else
{
Log.d("LED", "....");
}
}
};
final Handler handler = new Handler()
{
#Override
public void handleMessage(Message msg)
{
for(int count = 0;count<readcount;count++){
readBuffer[writeIndex] = usbdata[count];
/*move to the next write location*/
writeIndex++;
writeIndex %= maxnumbytes;
/*FIXME,check for overflow*/
//if(writeIndex == readIndex){
//}
}
/*caluclate the available bytes to read*/
if(writeIndex >= readIndex)
totalBytes = writeIndex-readIndex;
else
totalBytes = (maxnumbytes-readIndex)+writeIndex;
}
};
/*usb input data handler*/
private class handler_thread extends Thread {
Handler mHandler;
FileInputStream instream;
handler_thread(Handler h,FileInputStream stream ){
mHandler = h;
instream = stream;
}
public void run()
{
while(true)
{
Message msg = mHandler.obtainMessage();
try{
if(instream != null)
{
readcount = instream.read(usbdata,0,64);
if(readcount > 0)
{
datareceived = true;
msg.arg1 = usbdata[0];
msg.arg2 = usbdata[1];
}
mHandler.sendMessage(msg);
}
}catch (IOException e){}
}
}
}
}

Its better to use Log.d(TAG, text)
OR
In any subclass of activity you can do:
Toast.makeText(getApplicationContext(), "text", Toast.LENGTH_LONG).show();

ADK AndroidAccessory Read Function on Arduino should be getting something, per DemoKit sketch?

I'm using a Freeduino (Arduino Uno compatible) with a Samsung Galaxy Tab 10.1 running ICS (4) and I have succeeded in writing from the Arduino to the Android, but I have not been able to read from the Android in the Arduino sketch.
Here's the Android class for the USB Accessory:
package com.kegui.test;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.io.Writer;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.util.ArrayList;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import com.kegui.test.Scripto;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.usb.UsbAccessory;
import android.hardware.usb.UsbManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.ParcelFileDescriptor;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class USBAccess extends Activity implements Runnable, OnClickListener {
private static final String ACTION_USB_PERMISSION = "com.google.android.DemoKit.action.USB_PERMISSION";
protected static final String TAG = "KegUI";
private UsbManager mUsbManager;
private PendingIntent mPermissionIntent;
private boolean mPermissionRequestPending;
private TextView debugtext = null;
private Button button1 = null;
private Button button2 = null;
private boolean button2visible = false;
UsbAccessory mAccessory;
ParcelFileDescriptor mFileDescriptor;
FileInputStream mInputStream;
FileOutputStream mOutputStream;
private static final int MESSAGE_BUTTON_PRESSED = 1;
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
Log.i("KegApp", "***********************Received*************************");
if (ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
UsbAccessory accessory = (UsbAccessory) intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
if (intent.getBooleanExtra(
UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
openAccessory(accessory);
} else {
Log.d(TAG, "permission denied for accessory "
+ accessory);
}
mPermissionRequestPending = false;
}
} else if (UsbManager.ACTION_USB_ACCESSORY_DETACHED.equals(action)) {
UsbAccessory accessory = (UsbAccessory) intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
if (accessory != null && accessory.equals(mAccessory)) {
closeAccessory();
}
}
}
};
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(
ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
filter.addAction(UsbManager.ACTION_USB_ACCESSORY_DETACHED);
setContentView(R.layout.main);
final Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
new TempUpdateTask().execute("testing");
}
});
registerReceiver(mUsbReceiver, filter);
Log.d(TAG,"on Create'd");
}
#Override
public void onResume() {
super.onResume();
if (mInputStream != null && mOutputStream != null) {
return;
}
UsbAccessory[] accessories = mUsbManager.getAccessoryList();
UsbAccessory accessory = (accessories == null ? null : accessories[0]);
if (accessory != null) {
if (mUsbManager.hasPermission(accessory)) {
openAccessory(accessory);
} else {
synchronized (mUsbReceiver) {
if (!mPermissionRequestPending) {
mUsbManager.requestPermission(accessory,
mPermissionIntent);
mPermissionRequestPending = true;
}
}
}
} else {
Log.d(TAG, "mAccessory is null");
}
}
#Override
public void onPause() {
super.onPause();
closeAccessory();
}
#Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(mUsbReceiver);
}
private void openAccessory(UsbAccessory accessory) {
mFileDescriptor = mUsbManager.openAccessory(accessory);
if (mFileDescriptor != null) {
mAccessory = accessory;
FileDescriptor fd = mFileDescriptor.getFileDescriptor();
mInputStream = new FileInputStream(fd);
mOutputStream = new FileOutputStream(fd);
Thread thread = new Thread(null, this, "KegApp");
thread.start();
//enableControls(true);
} else {
Log.d(TAG, "accessory open fail");
}
}
public void run() {
int ret = 0;
byte[] buffer = new byte[16384];
int i;
Log.i("KegApp", "***********************in run*************************");
while (ret >= 0) {
try {
ret = mInputStream.read(buffer); // this will be always positive, as long as the stream is not closed
} catch (IOException e) {
break;
}
i = 0;
while (i < ret) {
Message m = Message.obtain(messageHandler, MESSAGE_BUTTON_PRESSED);
m.obj = buffer[i];
messageHandler.sendMessage(m);
i++;
}
}
}
private void closeAccessory() {
//enableControls(false);
try {
if (mFileDescriptor != null) {
mFileDescriptor.close();
}
} catch (IOException e) {
} finally {
mFileDescriptor = null;
mAccessory = null;
}
}
public void sendCommand(FileOutputStream mStream) {
BufferedOutputStream bo = new BufferedOutputStream(mStream);
// if (mStream != null && message.length > 0) {
try {
Log.i("KegApp", "***********************sending command now*************************");
bo.write(1); //message, 0, 3);
} catch (IOException e) {
Log.e(TAG, "write failed", e);
}
// }
}
#Override
public void onClick(View v) {
// Send some message to Arduino board, e.g. "13"
Log.e(TAG, "write failed");
}
// Instantiating the Handler associated with the main thread.
private Handler messageHandler = new Handler() {
#Override
public void handleMessage(Message msg) {
Log.i("KegApp", "***********************message handler before " + msg.what + "************************");
try {
String load = msg.obj.toString();
Log.i("KegApp", "***********************in message handler*************************");
/*
if (button2visible==false) {
debugtext.setText("Received message: "+String.valueOf(load));
button2.setVisibility(View.VISIBLE);
button2visible = true;
} else {
debugtext.setText("");
button2.setVisibility(View.GONE);
button2visible = false;
}
*/
new TempUpdateTask().execute(load);
} catch (Exception e) {
Log.e(TAG, "message failed", e);
}
}
};
// UpdateData Asynchronously sends the value received from ADK Main Board.
// This is triggered by onReceive()
class TempUpdateTask extends AsyncTask<String, String, String> {
// Called to initiate the background activity
protected String doInBackground(String... sensorValue) {
try {
Log.i("KegApp", "***********************calling sendcommand*********************");
sendCommand(mOutputStream);
Log.i("KegApp", "*********************incoming-sensorValue*********************" );
ArduinoMessage arduinoMessage = new ArduinoMessage(sensorValue[0]);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String returnString = String.valueOf(sensorValue[0]);//String.valueOf(sensorValue[0]) + " F";
publishProgress(String.valueOf(sensorValue[0]));
return (returnString); // This goes to result
}
// Called when there's a status to be updated
#Override
protected void onProgressUpdate(String... values) {
// Init TextView Widget to display ADC sensor value in numeric.
TextView tvAdcvalue = (TextView) findViewById(R.id.tvTemp);
tvAdcvalue.setText(String.valueOf(values[0]));
// Not used in this case
}
// Called once the background activity has completed
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
closeAccessory();
}
}
}
Here's my Arduino Sketch:
#include <FHB.h>
#include <Max3421e.h>
#include <Max3421e_constants.h>
#include <Max_LCD.h>
#include <Usb.h>
//FREEDUINO ONLY------------------------------------
//END FREEDUINO ONLY------------------------------------
int pin_light_sensor_1=A0;
int pin_output_sensor=9;
int currLightLevel=0;
//int prevLightLevel=0;
//int lightStableRange=90;
int delayTime=3000;
int loopCtr=0;
char cSTX=char(2);
char cSOH=char(1);
char cEOT=char(4);
char cGS=char(29);
char cRS=char(30);
char cCR=char(13);
char cLF=char(10);
//FREEDUINO ONLY------------------------------------
AndroidAccessory acc("Company Inc.",
"Kegbot5K datawriter",
"Kegbot 5000 data writer",
"1.0",
"http://companyinc.com",
"0000000012345678");
//END FREEDUINO ONLY------------------------------------
void setup()
{
pinMode(pin_light_sensor_1, INPUT);
pinMode(pin_output_sensor, OUTPUT);
Serial.begin(57600);
//FREEDUINO ONLY------------------------------------
Serial.println("pre-power");
acc.powerOn();
Serial.println("post-power");
//END FREEDUINO ONLY------------------------------------
}
void loop()
{
byte msg[3];
if (acc.isConnected()) {
currLightLevel = analogRead(pin_light_sensor_1);
//sysPrint(delayTime*loopCtr);
//sysPrint(",");
//sysPrint(currLightLevel);
writeDataMessage("LGH01", currLightLevel);
}
delay(1000);
if (acc.isConnected()) {
int len = acc.read(msg, sizeof(msg), 1);
Serial.println(len);
if (len > 0){
for (int index=0; index < len; index++){
digitalWrite(pin_output_sensor, 1);
delay(500);
digitalWrite(pin_output_sensor, 0);
}
}
}
loopCtr++;
delay(delayTime);
}
void writeHeader(String msgType)
{
sysPrint(cSTX);
sysPrint(cSTX);
sysPrint(cSOH);
sysPrint(msgType);
sysPrint(cGS);
}
void writeFooter()
{
sysPrint(cEOT);
sysPrintLn(cEOT);
}
void writeDataMessage(String sensorID, int value)
{
writeHeader("DATA");
sysPrint(sensorID);
sysPrint(cRS);
sysPrint(value);
writeFooter();
}
void writeAlarmMessage(String sensorID, String message)
//Do we need to enforce the 5 char sensorID here? I don't think so...
{
writeHeader("ALRM");
sysPrint(sensorID);
sysPrint(cRS);
sysPrint(message);
writeFooter();
}
void sysPrint(String whatToWrite)
{
int len=whatToWrite.length();
char str[len];
whatToWrite.toCharArray(str, len);
acc.write((void *)str, len);
// acc.write(&whatToWrite, whatToWrite.length());
}
void sysPrint(char whatToWrite)
{
acc.write((void *)whatToWrite, 1);
// acc.write(&whatToWrite, 1);
}
void sysPrint(int whatToWrite)
{
acc.write((void *)&whatToWrite, 1);
// acc.write(&whatToWrite, 1);
}
void sysPrintLn(String whatToWrite)
{
int len=whatToWrite.length();
char str[len];
whatToWrite.toCharArray(str, len);
acc.write((void *)str, len);
acc.write((void *)&cCR, 1);
acc.write((void *)&cLF, 1);
// acc.write(&whatToWrite, whatToWrite.length());
// acc.write(&cCR, 1);
// acc.write(&cLF, 1);
}
void sysPrintLn(char whatToWrite)
{
acc.write((void *)whatToWrite, 1);
acc.write((void *)&cCR, 1);
acc.write((void *)&cLF, 1);
// acc.write(&whatToWrite, 1);
// acc.write(&cCR, 1);
// acc.write(&cLF, 1);
}
The sendCommand function in the Android is logging that it was sent. The acc.read function is printing length to Serial output as -1, as in no input. Speaking of which, the Android logs do not show errors, so I'm thinking this might be an Arduino thing.
My Manifest has an Intent filter that's registering the device, although permissions might have something to do with it.
<intent-filter>
<action android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED" />
</intent-filter>
<meta-data android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED"
android:resource="#xml/accessory_filter" />
</activity>
Thanks in advance for any thoughts,
Sara

I have developed an RC helicopter that can be controlled using android by sending messages from the android to the arduino located on top of the Helicopter using Bluetooth Stick, i did not use usb yet for any project but when you are sending messages to the arduino you are using serial communication weather connected threw USB or Bluetooth i suggest to simply use Serial.read and every message you send to arduino end it with some symbol '#' for example just to separate messages and get the message character by character
this is the code to read the full message ended with '#' from the Serial port:
String getMessage()
{
String msg=""; //the message starts empty
byte ch; // the character that you use to construct the Message
byte d='#';// the separating symbol
if(Serial.available())// checks if there is a new message;
{
while(Serial.available() && Serial.peek()!=d)// while the message did not finish
{
ch=Serial.read();// get the character
msg+=(char)ch;//add the character to the message
delay(1);//wait for the next character
}
ch=Serial.read();// pop the '#' from the buffer
if(ch==d) // id finished
return msg;
else
return "NA";
}
else
return "NA"; // return "NA" if no message;
}
this function checks if there any message in the buffer if not it returns "NA".
if that did not help please inform.

Figured out what's going wrong - sendCommand is executing from the asynchronous TempTask so it doesn't get passed a valid reference to the FileOutputStream. I can execute sendCommand onClick from the main thread and receive on the Arduino just fine.