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Problem Getting Using Processing In Android Mode To Get Date and Time?

mikroTopiamikroTopia
edited December 2013 in Android Mode

Dear Processing Forum,

I am trying to develop my own art related wearable technology projects for experimenting with collective experience. I am keen to integrate Arduino based custom circuit boards, Android phone handsets running sketches coded in Processing, and The Web to store view data.

I m using Processing 2.0

My first step towards this has been to go through the Making Things Talk 2 tutorial: Mobile Phone Networks and The Physical World Page 401 : Project 31 - Personal Mobile Datalogger

I m having trouble running the Processing for Android sketch on page 408

P4ADatalogger.pde

This code can be found online here:

https://github.com/tigoe/MakingThingsTalk2/archive/master.zip

Then Chapter10.... P4ADatalogger..... P4ADatalogger.pde

I have rewritten part of the code as it used screenWidth and screenHeight (I replaced these with displayWidth and displayHeight - these parts of the code are now compiling)

However, when i try to run the code on my device (Android Nexus 4) i get the following error:

    compile:
        [javac] Compiling 3 source files to /var/folders/b6/k9d93zl514d735ngymcnl79c0000gn/T/android8689530784054544998sketch/bin/classes
        [javac] /var/folders/b6/k9d93zl514d735ngymcnl79c0000gn/T/android8689530784054544998sketch/src/processing/test/p4adatalogger/P4ADatalogger.java:85: cannot find symbol
        [javac] symbol  : method getTime()
        [javac] location: class processing.test.p4adatalogger.P4ADatalogger
        [javac]   text(getTime(), 10, displayHeight/4 + 60);
        [javac]        ^
        [javac] /var/folders/b6/k9d93zl514d735ngymcnl79c0000gn/T/android8689530784054544998sketch/src/processing/test/p4adatalogger/P4ADatalogger.java:105: cannot find symbol
        [javac] symbol  : method getTime()
        [javac] location: class processing.test.p4adatalogger.P4ADatalogger
        [javac]       currentReadings += getTime() +"," + thisReading;
        [javac]                          ^
        [javac] /var/folders/b6/k9d93zl514d735ngymcnl79c0000gn/T/android8689530784054544998sketch/src/processing/test/p4adatalogger/P4ADatalogger.java:118: cannot find symbol
        [javac] symbol  : method getTime()
        [javac] location: class processing.test.p4adatalogger.P4ADatalogger
        [javac]     lastSendTime = getTime();    // a String to print on the screen
        [javac]                    ^
        [javac] 3 errors

    BUILD FAILED
    /Users/dm-shoes/Downloads/adt-bundle-mac-x86_64-20130522/sdk/tools/ant/build.xml:713: The following error occurred while executing this line:
    /Users/dm-shoes/Downloads/adt-bundle-mac-x86_64-20130522/sdk/tools/ant/build.xml:727: Compile failed; see the compiler error output for details.

    Total time: 3 seconds

It seems there is a problem finding the symbol: [javac] symbol : method getTime()

can i replace

getTime()

with another method that will compile?

Can anyone please help to get this sketch working?

Thanks in advance

Tagged:

Answers

  • calsigncalsign

    I am unaware of any method getTime(). Perhaps this is part of the example and was left out? A possible alternative is System.currentTimeMillis(), which returns a long value that respresents the current system time in milliseconds.

  • mikroTopiamikroTopia
    edited December 2013

    Thanks for taking a look at this Calsign i ll try using System.currentTimeMillis() instead. I ll let you know how i get on. Here is the full example code incase it helps:

    /*
 Datalogger
 Receives data via Bluetooth every ten seconds
 Uploads data via HTTP every two minutes
 Context: Processing, Android mode
 */
// import cc.arduino.btserial.*;

// instance of the library:
BtSerial bt;

int readInterval = 10;      // in seconds
int sendInterval = 2;       // in minutes

int lastRead = second();    // the seconds last time you read
int lastSend = minute();    // the minute last time you read
String lastSendTime;         // String timestamp of last  server update

// URL of your PHP Script: <--------- NEED TO CHANGE THIS TO MY WEBSITE
String url = "http://www.example.com/logger.php?data=";
String currentReadings = ""; // group of readings, with datestamps
String thisReading;          // most recent reading

String connectionState = ""; // connected to Bluetooth or not?

// ned to download APWidgets and use APButton to get the next bit to work....
Button readButton;           // Button for prompting immediate read - problem here defining Button (its not red???)
Button sendButton;           // Button for prompting immediate send
boolean updateNow = false;   // flag to force an update
boolean sendNow = false;     // flag to force a send

// color scheme from http://kuler.adobe.com
// deep optimism by nicanore:
color bgColor = #2B0D15 ;
color textColor = #FFEB97 ;
color buttonColor = #565F63 ;
color buttonHighlightColor = #ACBD9B ;

void setup() {
  // set color scheme:
  background(bgColor);
  fill(textColor);

  // Setup Fonts:
  String[] fontList = PFont.list();
  PFont androidFont = createFont(fontList[0], 24, true);
  textFont(androidFont, 24);

  // instantiate the library:
  bt = new BtSerial( this );
  // try to connect to Bluetooth:
  connectionState = connect();

 readButton = new Button(displayWidth/2 - 100, 2* displayHeight/3, 200, 60, buttonColor, buttonHighlightColor, "Get Reading");
 sendButton = new Button(displayWidth/2 - 100, 2*displayHeight/3 + 80, 200, 60, buttonColor, buttonHighlightColor, "Send Reading");
}

void draw() {
  // display data onscreen:
  background(bgColor);
  fill(textColor);
  textAlign(LEFT);
  text(connectionState, 10, displayHeight/4);
  text(getTime(), 10, displayHeight/4 + 60);
  text("latest reading (volts): " + thisReading, 10, displayHeight/4 + 90);
  text("Server updated at:\n" + lastSendTime, 10, displayHeight/4 + 120);

  // draw the buttons:
  readButton.display();
  sendButton.display();

  if (sendNow) {
      textAlign(LEFT);
    text("sending to server, please wait...", 10, displayHeight/4 - 60);
  }

  // if the update interval has passed, 
  // or updateNow is true, update automatically:
  if (abs(second() - lastRead) >= readInterval || updateNow) {
    thisReading = getData();

    // if you got a valid reading, add a timestamp:
    if (thisReading != null) {      
      currentReadings += getTime() +"," + thisReading;
      // take note of when you last updated:
      lastRead = second();
      // you've updated, no need to do it again until prompted:
      updateNow = false;
    }
  }

  // if the send interval has passed, 
  // or sendNow is true, update automatically:
  if (abs(minute() - lastSend) >= sendInterval || sendNow ) {
    sendData(currentReadings);
    // get the time two ways:
    lastSendTime = getTime();    // a String to print on the screen
    lastSend = minute();         // an int for further comparison
  }

  // if the read button changed from not pressed to pressed,
  // set updateNow, to force an update next time through the
  // loop. Do the same for the send butto and sendNow, right below:
  if (readButton.isPressed() && !readButton.getLastState()) {
    updateNow = true;
  }
  //save the state of the button for next check:
  readButton.setLastState(readButton.isPressed());

  if (sendButton.isPressed() && !sendButton.getLastState()) {
    sendNow = true;
  }
  //save the state of the button for next check:
  sendButton.setLastState(sendButton.isPressed());
}

void pause() {
  // if you have any readings, send them:
  if (!currentReadings.equals("")) {
    sendData(currentReadings);
  }
  // stop the Bluetooth connection so you can start it again:
  if (bt != null && bt.isConnected()) {
    bt.disconnect();
  }
}

String connect() {
  String result = "Bluetooth not initialized yet...";
  if (bt !=null) {
    // if you are connnected, get data:
    if (!bt.isConnected() ) {  
      // get the list of paired devices:
      String[] pairedDevices = bt.list();

      if (pairedDevices.length > 0) {
        println(pairedDevices);
        // open a connection to the first one:
        bt.connect( pairedDevices[0] );
        result = "Connected to \n" + bt.getName();
      }
    }
    else {
      result = "Couldn't get any paired devices";
    }
  } 
  return result;
}

String getData() {
  String result = ""; 

  if (bt != null) {
    // if you are connnected, get data:
    if ( bt.isConnected() ) {    
      // send data to get new data:
      bt.write("A");
      // wait for incoming data:
      while (bt.available () == 0);
      // if there are incoming bytes available, read them:
      while (bt.available () > 0) {
        // add the incoming bytes to the result string:
        result += char(bt.read());
      }
      // get the last character of the result string:
      char lastChar = result.charAt(result.length() - 1);
      // make sure it's a newline, or you don't have valid data:
      if (lastChar != '\n') {
        result = null;
      }
    } // if you're not connected, try to pair:
    else {
      connectionState = connect();
    }
  }
  return result;
}

void sendData(String thisData) {
  // if there's data to send
  if (thisData != null) {
    // URL-encode the data and URL:
    String sendString = formatData(url + thisData);
    //send the data via HTTP GET:
    String[] result = loadStrings(sendString);
    // clear currentReadings to get more:
    String currentReadings = "";
  }
}

String formatData(String thisString) {
  // convert newlines, carriage returns, and 
  // spaces to HTML-safe equivalent:
  String result = thisString.replaceAll(" ", "%20");
  result = result.replaceAll("\n", "%0A");
  result = result.replaceAll("\r", "%0D");
  return result;
}

// get the date and time as a String:
String getTime() {
  System.out.print("\nDate:
  "+df.format(ca.getTime()));

  Date currentDate = new Date();
  return currentDate.toString();
}

// The Button class defines the behavior and look
// of the onscreen buttons.  Their behavior is slightly
// different on a touchscreen than on a mouse-based
// screen, because there is no mouseClick handler.
class Button {
  int x, y, w, h;                    // positions of the buttons
  color basecolor, highlightcolor;   // color and highlight color
  color currentcolor;                // current color of the button
  String name;                       // name on the button
  boolean pressedLastTime;           // if it was pressed last time 

  // Constructor: sets all the initial values for 
  // each instance of the Button class
  Button(int thisX, int thisY, int thisW, int thisH, 
  color thisColor, color thisHighlight, String thisName) {
    x = thisX;
    y = thisY;
    h = thisH;
    w = thisW;
    basecolor = thisColor;
    highlightcolor = thisHighlight;
    currentcolor = basecolor;
    name = thisName;
    pressedLastTime = false;
  }

  // draw the button and its text:
  void display() {
    // if pressed, change the color:
    if (isPressed()) {
      currentcolor = highlightcolor;
    } 
    else {    
      currentcolor = basecolor;
    }
    fill(currentcolor);
    rect(x, y, w, h);

    //put the name in the middle of the button:
    fill(textColor);
    textAlign(CENTER);
    text(name, x+w/2, y+h/2);
  }

  // check to see if the mouse position is inside
  // the bounds of the rectangle and sets its current state:
  boolean isPressed() {
    if (mouseX >= x && mouseX <= x+w && 
      mouseY >= y && mouseY <= y+h && mousePressed) {
      return true;
    } 
    else {
      return false;
    }
  }

  //this method is for setting the state of the button
  // last time it was checked, as opposed to its
  // current state:
  void setLastState(boolean state) {
    pressedLastTime = state;
  }
  boolean getLastState() {
    return pressedLastTime;
  }
}
  • calsigncalsign

    There is indeed a method getTime() at line 201:

    String getTime() {
  System.out.print("\nDate:
  "+df.format(ca.getTime()));

  Date currentDate = new Date();
  return currentDate.toString();
}

    I don't know why you get such an error when compiling...

  • mikroTopiamikroTopia

    I tried using System.currentTimeMillis() instead of getTime The sketch now compiles and runs on my Nexus4 handset!! I need to change a few things to get it running correctly but i feel like it's nearly there!! Thanks for this help Calsign. Here is the altered code:

    /*
 Datalogger
 Receives data via Bluetooth every ten seconds
 Uploads data via HTTP every two minutes
 Context: Processing, Android mode
 */
//import cc.arduino.btserial.*;
// instance of the library:
BtSerial bt;

int readInterval = 10;      // in seconds
int sendInterval = 2;       // in minutes

int lastRead = second();    // the seconds last time you read
int lastSend = minute();    // the minute last time you read
String lastSendTime;         // String timestamp of last  server update

// URL of your PHP Script:
String url = "http://www.example.com/logger.php?data=";
String currentReadings = ""; // group of readings, with datestamps
String thisReading;          // most recent reading

String connectionState = ""; // connected to Bluetooth or not?

// ned to download APWidgets and use APButton to get the next bit to work....
Button readButton;           // Button for prompting immediate read - problem here defining Button (its not red???)
Button sendButton;           // Button for prompting immediate send
boolean updateNow = false;   // flag to force an update
boolean sendNow = false;     // flag to force a send

// color scheme from http://kuler.adobe.com
// deep optimism by nicanore:
color bgColor = #2B0D15 ;
color textColor = #FFEB97 ;
color buttonColor = #565F63 ;
color buttonHighlightColor = #ACBD9B ;

void setup() {
  // set color scheme:
  background(bgColor);
  fill(textColor);

  // Setup Fonts:
  String[] fontList = PFont.list();
  PFont androidFont = createFont(fontList[0], 24, true);
  textFont(androidFont, 24);

  // instantiate the library:
  bt = new BtSerial( this );
  // try to connect to Bluetooth:
  connectionState = connect();

 readButton = new Button(displayWidth/2 - 100, 2* displayHeight/3, 200, 60, buttonColor, buttonHighlightColor, "Get Reading");
 sendButton = new Button(displayWidth/2 - 100, 2*displayHeight/3 + 80, 200, 60, buttonColor, buttonHighlightColor, "Send Reading");
}

void draw() {
  // display data onscreen:
  background(bgColor);
  fill(textColor);
  textAlign(LEFT);
  text(connectionState, 10, displayHeight/4);
  text(getTime(), 10, displayHeight/4 + 60);
  text("latest reading (volts): " + thisReading, 10, displayHeight/4 + 90);
  text("Server updated at:\n" + lastSendTime, 10, displayHeight/4 + 120);

  // draw the buttons:
  readButton.display();
  sendButton.display();

  if (sendNow) {
      textAlign(LEFT);
    text("sending to server, please wait...", 10, displayHeight/4 - 60);
  }

  // if the update interval has passed, 
  // or updateNow is true, update automatically:
  if (abs(second() - lastRead) >= readInterval || updateNow) {
    thisReading = getData();

    // if you got a valid reading, add a timestamp:
    if (thisReading != null) {      
      currentReadings += getTime() +"," + thisReading;
      // take note of when you last updated:
      lastRead = second();
      // you've updated, no need to do it again until prompted:
      updateNow = false;
    }
  }

  // if the send interval has passed, 
  // or sendNow is true, update automatically:
  if (abs(minute() - lastSend) >= sendInterval || sendNow ) {
    sendData(currentReadings);
    // get the time two ways:
    lastSendTime = getTime();    // a String to print on the screen
    lastSend = minute();         // an int for further comparison
  }

  // if the read button changed from not pressed to pressed,
  // set updateNow, to force an update next time through the
  // loop. Do the same for the send butto and sendNow, right below:
  if (readButton.isPressed() && !readButton.getLastState()) {
    updateNow = true;
  }
  //save the state of the button for next check:
  readButton.setLastState(readButton.isPressed());

  if (sendButton.isPressed() && !sendButton.getLastState()) {
    sendNow = true;
  }
  //save the state of the button for next check:
  sendButton.setLastState(sendButton.isPressed());
}

void pause() {
  // if you have any readings, send them:
  if (!currentReadings.equals("")) {
    sendData(currentReadings);
  }
  // stop the Bluetooth connection so you can start it again:
  if (bt != null && bt.isConnected()) {
    bt.disconnect();
  }
}

String connect() {
  String result = "Bluetooth not initialized yet...";
  if (bt !=null) {
    // if you are connnected, get data:
    if (!bt.isConnected() ) {  
      // get the list of paired devices:
      String[] pairedDevices = bt.list();

      if (pairedDevices.length > 0) {
        println(pairedDevices);
        // open a connection to the first one:
        bt.connect( pairedDevices[0] );
        result = "Connected to \n" + bt.getName();
      }
    }
    else {
      result = "Couldn't get any paired devices";
    }
  } 
  return result;
}

String getData() {
  String result = ""; 

  if (bt != null) {
    // if you are connnected, get data:
    if ( bt.isConnected() ) {    
      // send data to get new data:
      bt.write("A");
      // wait for incoming data:
      while (bt.available () == 0);
      // if there are incoming bytes available, read them:
      while (bt.available () > 0) {
        // add the incoming bytes to the result string:
        result += char(bt.read());
      }
      // get the last character of the result string:
      char lastChar = result.charAt(result.length() - 1);
      // make sure it's a newline, or you don't have valid data:
      if (lastChar != '\n') {
        result = null;
      }
    } // if you're not connected, try to pair:
    else {
      connectionState = connect();
    }
  }
  return result;
}

void sendData(String thisData) {
  // if there's data to send
  if (thisData != null) {
    // URL-encode the data and URL:
    String sendString = formatData(url + thisData);
    //send the data via HTTP GET:
    String[] result = loadStrings(sendString);
    // clear currentReadings to get more:
    String currentReadings = "";
  }
}

String formatData(String thisString) {
  // convert newlines, carriage returns, and 
  // spaces to HTML-safe equivalent:
  String result = thisString.replaceAll(" ", "%20");
  result = result.replaceAll("\n", "%0A");
  result = result.replaceAll("\r", "%0D");
  return result;
}

// get the date and time as a String:
String getTime() {
  //original code:
 // Date currentDate = new Date();
// return currentDate.toString();

 //tried: but didtnt work
 // System.out.print("\nDate:
 // "+df.format(cal.getTime()));


 //next thing to try...
 long startMillis = System.currentTimeMillis();
 long current = System.currentTimeMillis() - startMillis;

// return System.currentTimeMillis() - startMillis;
   String s=""+current;
   return s;

  //Calender doesnt work either
 // Date d = null;
///Calendar cal = GregorianCalendar.getInstance();
//cal.set(1900 + year, month, day);
//d = cal.getTime();
}

// The Button class defines the behavior and look
// of the onscreen buttons.  Their behavior is slightly
// different on a touchscreen than on a mouse-based
// screen, because there is no mouseClick handler.
class Button {
  int x, y, w, h;                    // positions of the buttons
  color basecolor, highlightcolor;   // color and highlight color
  color currentcolor;                // current color of the button
  String name;                       // name on the button
  boolean pressedLastTime;           // if it was pressed last time 

  // Constructor: sets all the initial values for 
  // each instance of the Button class
  Button(int thisX, int thisY, int thisW, int thisH, 
  color thisColor, color thisHighlight, String thisName) {
    x = thisX;
    y = thisY;
    h = thisH;
    w = thisW;
    basecolor = thisColor;
    highlightcolor = thisHighlight;
    currentcolor = basecolor;
    name = thisName;
    pressedLastTime = false;
  }

  // draw the button and its text:
  void display() {
    // if pressed, change the color:
    if (isPressed()) {
      currentcolor = highlightcolor;
    } 
    else {    
      currentcolor = basecolor;
    }
    fill(currentcolor);
    rect(x, y, w, h);

    //put the name in the middle of the button:
    fill(textColor);
    textAlign(CENTER);
    text(name, x+w/2, y+h/2);
  }

  // check to see if the mouse position is inside
  // the bounds of the rectangle and sets its current state:
  boolean isPressed() {
    if (mouseX >= x && mouseX <= x+w && 
      mouseY >= y && mouseY <= y+h && mousePressed) {
      return true;
    } 
    else {
      return false;
    }
  }

  //this method is for setting the state of the button
  // last time it was checked, as opposed to its
  // current state:
  void setLastState(boolean state) {
    pressedLastTime = state;
  }
  boolean getLastState() {
    return pressedLastTime;
  }
}
  • mikroTopiamikroTopia

    My next step is to check that the new code beginning line 199:

    // get the date and time as a String:
String getTime() {
  //original code:
 // Date currentDate = new Date();
// return currentDate.toString();

 //tried: but didtnt work
 // System.out.print("\nDate:
 // "+df.format(cal.getTime()));


 //next thing to try...
 long startMillis = System.currentTimeMillis();
 long current = System.currentTimeMillis() - startMillis;

// return System.currentTimeMillis() - startMillis;
   String s=""+current;
   return s;

  //Calender doesnt work either
 // Date d = null;
///Calendar cal = GregorianCalendar.getInstance();
//cal.set(1900 + year, month, day);
//d = cal.getTime();
}

    Will be found by line 63 in void draw() {

    text(getTime(), 10, displayHeight/4 + 60);

    I ll let you know how i get on!!

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