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POAndroid: Calling an activity from a Thread
 

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    <p>My problem is probably going to be simple and awkward at the same time, but I am a little stuck.</p> <p>I have a Main.java class, that extends Activity.</p> <p>Inside that class, I do the following:</p> <pre><code>ringerServer = new Thread(new RingerServer()); ringerServer.start(); </code></pre> <p>What I want to do is have the RingerServer thread running continously.</p> <p>Inside that thread, I listen for a TCP connection. If I get one, I start another class, which sends and receives UDP packet.</p> <pre><code>public class RingerServer implements Runnable { public static final int SERVERPORT = 4445; // Default port to connect to @Override public void run() { try { // Create a socket for handling incoming requests ServerSocket server = new ServerSocket(SERVERPORT); while (!VoIPCall.onCall) { // Wait for an incoming connection Socket clientSocket = server.accept(); // TODO: Display a message for the user to accept or decline // For now, automatically accept the call Intent myIntent = new Intent(null, VoIPCall.class); // Put the IP as a parameter myIntent.putExtra("inetAddress", clientSocket.getInetAddress()); startActivity(myIntent); } } catch (IOException e) { Log.e("TCP", "S: Error", e); } } } </code></pre> <p>My problem has to do with the lines:</p> <pre><code>Intent myIntent = new Intent(null, VoIPCall.class); myIntent.putExtra("inetAddress", clientSocket.getInetAddress()); startActivity(myIntent); </code></pre> <p>Those lines would work fine inside an Activity but it doesn't to complain as it is a Thread, it doesn't know about the Activity class, because it doesn't extend it, but implements Runnable.</p> <p>I am not sure how I can make my program keep running the RingerServer but have the main thread go to VoIPCall class. Any ideas please?</p> <p>I really appreciate your help.</p> <p>Thank you very much,</p> <p>Jary</p>
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    1. COOne problem in your code is that you are passing null as the context to your Intent. You need to pass it an actual Context object for that call to work. If you want your Thread to be a separate class, then you probably should create a constructor that takes a Context as its argument. You can pass in the Activity or Service instance that is instantiating the Thread into the constructor.
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