我有一个类，我已经实现了可运行，我在这个类的一个函数中启动线程，我从主活动中调用这个函数，我创建这个类的对象并调用线程类的方法。我的主我调用此类方法的活动代码是：
broadcast broadcastobject.threadfunc(messages);
我创建线程的班级是：
public class broadcast {
private DatagramSocket socket;
String str;
private static final int TIMEOUT_MS = 10;
WifiManager mWifi;
EditText et;
DatagramPacket packet;
Button bt;
private static final int SERVERPORT = 11111;
private static final String SERVER_IP = "192.168.1.255";
public void threadfunc(String message){
str=message;
new Thread(new ClientThread()).start();
}
/*
private InetAddress getBroadcastAddress() throws IOException {
DhcpInfo dhcp = mWifi.getDhcpInfo();
if (dhcp == null) {
//Log.d(TAG, "Could not get dhcp info");
return null;
}
int broadcast = (dhcp.ipAddress & dhcp.netmask) | ~dhcp.netmask;
byte[] quads = new byte[4];
for (int k = 0; k < 4; k++)
quads[k] = (byte) ((broadcast >> k * 8) & 0xFF);
return InetAddress.getByAddress(quads);
}
*/
class ClientThread implements Runnable {
@Override
public void run() {
try {
socket = new DatagramSocket(SERVERPORT);
socket.setBroadcast(true);
// socket.setSoTimeout(TIMEOUT_MS);
} catch (SocketException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
InetAddress serverAddr = null;
try {
serverAddr = InetAddress.getByName(SERVER_IP);
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
packet = new DatagramPacket(str.getBytes(), str.length(),serverAddr,SERVERPORT);
try {
socket.send(packet);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
我的日志猫是：
08-31 21:55:56.277: D/gralloc_goldfish(1669): Emulator without GPU emulation detected.
08-31 21:56:02.467: D/AndroidRuntime(1669): Shutting down VM
08-31 21:56:02.467: W/dalvikvm(1669): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
08-31 21:56:02.517: E/AndroidRuntime(1669): FATAL EXCEPTION: main
08-31 21:56:02.517: E/AndroidRuntime(1669): java.lang.NullPointerException
08-31 21:56:02.517: E/AndroidRuntime(1669): at soft.b.peopleassist.Send$1.onClick(Send.java:113)
08-31 21:56:02.517: E/AndroidRuntime(1669): at android.view.View.performClick(View.java:3480)
08-31 21:56:02.517: E/AndroidRuntime(1669): at android.view.View$PerformClick.run(View.java:13983)
08-31 21:56:02.517: E/AndroidRuntime(1669): at android.os.Handler.handleCallback(Handler.java:605)
08-31 21:56:02.517: E/AndroidRuntime(1669): at android.os.Handler.dispatchMessage(Handler.java:92)
08-31 21:56:02.517: E/AndroidRuntime(1669): at android.os.Looper.loop(Looper.java:137)
08-31 21:56:02.517: E/AndroidRuntime(1669): at android.app.ActivityThread.main(ActivityThread.java:4340)
08-31 21:56:02.517: E/AndroidRuntime(1669): at java.lang.reflect.Method.invokeNative(Native Method)
08-31 21:56:02.517: E/AndroidRuntime(1669): at java.lang.reflect.Method.invoke(Method.java:511)
08-31 21:56:02.517: E/AndroidRuntime(1669): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
08-31 21:56:02.517: E/AndroidRuntime(1669): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
08-31 21:56:02.517: E/AndroidRuntime(1669): at dalvik.system.NativeStart.main(Native Method)
