UDPサーバーを使用していますが、サーバークラスでエラーが発生しています。サーバーにサービスクラスを使用してスレッドを作成していますが、最終的には実行されず、エラーが発生し、数秒間実行した後に停止します。
public class MainActivity extends Service {
static String UDP_BROADCAST = "UDPBroadcast";
DatagramSocket socket;
private void listenAndWaitAndThrowIntent(InetAddress broadcastIP, Integer port) throws Exception {
byte[] recvBuf = new byte[15000];
if (socket == null || socket.isClosed())
{
socket = new DatagramSocket(port, broadcastIP);
socket.setBroadcast(true);
}
DatagramPacket packet = new DatagramPacket(recvBuf, recvBuf.length);
Log.e("UDP", "Waiting for UDP broadcast");
socket.receive(packet);
String senderIP = packet.getAddress().getHostAddress();
String message = new String(packet.getData()).trim();
Log.e("UDP", "Got UDB broadcast from " + senderIP + ", message: " + message);
// broadcastIntent(senderIP, message);
socket.close();
}
private void broadcastIntent(String senderIP, String message) {
Intent intent = new Intent(MainActivity.UDP_BROADCAST);
intent.putExtra("sender", senderIP);
intent.putExtra("message", message);
sendBroadcast(intent);
}
Thread UDPBroadcastThread;
void startListenForUDPBroadcast() {
UDPBroadcastThread = new Thread(new Runnable() {
public void run() {
try {
InetAddress broadcastIP = InetAddress.getByName("192.168.1.101"); //172.16.238.42 //192.168.1.255
Integer port = 11111;
while (shouldRestartSocketListen) {
listenAndWaitAndThrowIntent(broadcastIP, port);
}
//if (!shouldListenForUDPBroadcast) throw new ThreadDeath();
} catch (Exception e) {
Log.i("UDP", "no longer listening for UDP broadcasts cause of error " + e.getMessage());
}
}
});
UDPBroadcastThread.start();
}
private Boolean shouldRestartSocketListen=true;
void stopListen() {
shouldRestartSocketListen = false;
socket.close();
}
@Override
public void onCreate() {
};
@Override
public void onDestroy() {
stopListen();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
shouldRestartSocketListen = true;
startListenForUDPBroadcast();
Log.i("UDP", "Service started");
return START_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
}
私の丸太猫は:
08-26 19:28:44.232: D/AndroidRuntime(618): Shutting down VM
08-26 19:28:44.252: W/dalvikvm(618): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
08-26 19:28:44.352: E/AndroidRuntime(618): FATAL EXCEPTION: main
08-26 19:28:44.352: E/AndroidRuntime(618): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.receiver/com.example.receiver.MainActivity}: java.lang.ClassCastException: com.example.receiver.MainActivity cannot be cast to android.app.Activity
08-26 19:28:44.352: E/AndroidRuntime(618): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1879)
08-26 19:28:44.352: E/AndroidRuntime(618): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
08-26 19:28:44.352: E/AndroidRuntime(618): at android.app.ActivityThread.access$600(ActivityThread.java:122)
08-26 19:28:44.352: E/AndroidRuntime(618): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
08-26 19:28:44.352: E/AndroidRuntime(618): at android.os.Handler.dispatchMessage(Handler.java:99)
08-26 19:28:44.352: E/AndroidRuntime(618): at android.os.Looper.loop(Looper.java:137)
08-26 19:28:44.352: E/AndroidRuntime(618): at android.app.ActivityThread.main(ActivityThread.java:4340)
08-26 19:28:44.352: E/AndroidRuntime(618): at java.lang.reflect.Method.invokeNative(Native Method)
08-26 19:28:44.352: E/AndroidRuntime(618): at java.lang.reflect.Method.invoke(Method.java:511)
08-26 19:28:44.352: E/AndroidRuntime(618): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
08-26 19:28:44.352: E/AndroidRuntime(618): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
08-26 19:28:44.352: E/AndroidRuntime(618): at dalvik.system.NativeStart.main(Native Method)
08-26 19:28:44.352: E/AndroidRuntime(618): Caused by: java.lang.ClassCastException: com.example.receiver.MainActivity cannot be cast to android.app.Activity
08-26 19:28:44.352: E/AndroidRuntime(618): at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
08-26 19:28:44.352: E/AndroidRuntime(618): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1870)
08-26 19:28:44.352: E/AndroidRuntime(618): ... 11 more