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Can't figure out why this if statement isn't working

[2 Replies]
- 21-Jul-2011 08:47 AM
- Forum: Programming Questions
I'm trying to play music based on which RFID card is over the reader. Everything is working properly, the cards are being recognized, and I can get the music to play if it's not within the if statement.

When I put the card with tag 1600a8c21c over the reader, it is recognized and prints the card tag, but the if statement does not execute.

I would have assumed that tag == songTag when the card is over the reader, but for some reason this is not the case. The relevant if statement is at the very bottom.

Thanks for any help
2. import com.phidgets.*;
3. import com.phidgets.event.*;
4. import ddf.minim.*;
6. AudioPlayer player;
7. Minim minim;
8. RFIDPhidget rfid = null;
9. PFont font;
10. String tag="";
11. boolean playing = false;
12. String songTag = "1600a8c21c";
14. void setupReader() {
15. try {
16. rfid = new RFIDPhidget();
18. rfid.addAttachListener(new AttachListener() {
19. public void attached(AttachEvent ae)
20. {
21. try
22. {
23. ((RFIDPhidget)ae.getSource()).setAntennaOn(true);
24. ((RFIDPhidget)ae.getSource()).setLEDOn(true);
25. }
26. catch (PhidgetException ex) {
27. }
28. println("attachment of " + ae);
29. }
30. }
31. );
33. rfid.addDetachListener(new DetachListener() {
34. public void detached(DetachEvent ae) {
35. System.out.println("detachment of " + ae);
36. }
37. }
38. );
40. rfid.addErrorListener(new ErrorListener() {
41. public void error(ErrorEvent ee) {
42. System.out.println("error event for " + ee);
43. }
44. }
45. );
47. rfid.addTagGainListener(new TagGainListener()
48. {
49. public void tagGained(TagGainEvent oe)
50. {
51. System.out.println(oe);
52. tag = oe.getValue();
53. }
54. }
55. );
57. rfid.addTagLossListener(new TagLossListener()
58. {
59. public void tagLost(TagLossEvent oe)
60. {
61. System.out.println(oe);
62. tag = "";
63. }
64. }
65. );
67. rfid.addOutputChangeListener(new OutputChangeListener()
68. {
69. public void outputChanged(OutputChangeEvent oe)
70. {
71. System.out.println(oe);
72. }
73. }
74. );
76. rfid.openAny();
77. println("waiting for RFID attachment…");
78. rfid.waitForAttachment(1000);
80. System.out.println("Serial: " + rfid.getSerialNumber());
81. System.out.println("Outputs: " + rfid.getOutputCount());
83. System.out.println("Outputting events.");
84. }
85. catch (PhidgetException ex)
86. {
87. System.out.println(ex);
88. }
89. }
91. void closeReader() {
92. try {
93. System.out.print("closing…");
94. rfid.close();
95. rfid = null;
96. System.out.println(" ok");
97. if (false) {
98. System.out.println("wait for finalization…");
99. System.gc();
100. }
101. }
102. catch (PhidgetException ex)
103. {
104. System.out.println(ex);
105. }
106. }
110. void setup()
111. {
112. size(400, 100);
114. // setup Reader
115. setupReader();
117. // close Reader: Should add a button or some other trigger to call this method
118. //closeReader();
119. minim = new Minim(this);
121. }
123. void draw()
124. {
125. background(200);
126. text("Current Tag: "+tag, 50, 50);
128. if (tag == songTag && playing == false){
129. println("YAY");
130. player = minim.loadFile("preview.mp3", 2048);
131. player.play();
132. playing = true;
133. }
134. }

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