Processing Forum

Screen name:
ovicin

ovicin's Profile

1 Posts

0 Responses

0 Followers

Activity Trend

Last 30 days

Loading Chart...

Show:

Expanded view
List view

Android Processing connect to wifi programatically

[0 Replies]
- 04-Sep-2013 03:50 AM
- Forum: Android Processing
I am trying to connect to a wifi network programatically but my application crashes with the following error:
2. FATAL EXCEPTION: Animation Thread
3. java.lang.NullPointerException
4. at processing.test.sketch_130903a.sketch_130903a.connect_to_wifi(sketch_130903a.java:54)
5. at processing.test.sketch_130903a.sketch_130903a.setup(sketch_130903a.java:75)
6. at processing.core.PApplet.handleDraw(Unknown Source)
7. at processing.core.PGraphicsAndroid2D.requestDraw(Unknown Source)
8. at processing.core.PApplet.run(Unknown Source)
9. at java.lang.Thread.run(Thread.java:1019)
Here is the code that I used (the SSID and password were removed)
2. import android.net.wifi.*;
3. import android.content.*;
4. import java.util.*;
6. Context context;
8. void connect_to_wifi(){
10. //create wifi connection
11. String networkSSID = "";
12. String networkPass = "";
14. WifiConfiguration conf = new WifiConfiguration();
15. conf.SSID = "\"" + networkSSID + "\""; // Please note the quotes. String should contain ssid in quotes
17. //For WPA network you need to add passphrase like this:
19. conf.preSharedKey = "\""+ networkPass +"\"";
21. //Then, you need to add it to Android wifi manager settings:
22. WifiManager wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);
23. wifiManager.addNetwork(conf);
25. //And finally, you might need to enable it, so Android conntects to it:
26. List<WifiConfiguration> list = wifiManager.getConfiguredNetworks();
27. for( WifiConfiguration i : list ) {
28. if(i.SSID != null && i.SSID.equals("\"" + networkSSID + "\"")) {
29. wifiManager.disconnect();
30. wifiManager.enableNetwork(i.networkId, true);
31. wifiManager.reconnect();
33. break;
34. }
35. }
36. }
38. void setup() {
39. size(480,800);
40. noStroke();
41. fill(255);
42. rectMode(CENTER); // This sets all rectangles to draw from the center point
43. connect_to_wifi();
44. }
46. void draw() {
47. background(#FF9900);
48. rect(width/2, height/2, 150, 150);
49. }
In the sketch properties the permissions for ACCESS_WIFI_STATE and CHANGE_WIFI_STATE are set.

Any sugestions on where is the problem?

Thanks

«Prev
Next »