我正在尝试响应手机上的组播数据报数据包。这是不断导致 ANR 的代码部分:
private void multicastLoop() {
String res = Build.FINGERPRINT + "n";
final InetAddress group;
final MulticastSocket socket;
final DatagramPacket response;
try {
group = InetAddress.getByName("239.255.255.127");
socket = new MulticastSocket(port);
socket.setLoopbackMode(true);
socket.setSoTimeout(1000);
socket.joinGroup(group);
response = new DatagramPacket(res.getBytes(), res.length(), group, port);
} catch (IOException e) {
e.printStackTrace();
return;
}
Thread t = new Thread(new Runnable() {
@Override
public void run() {
while(isRunning) {
try {
byte[] data = new byte[1024];
DatagramPacket dm = new DatagramPacket(data, data.length);
socket.receive(dm);
if (Arrays.equals(dm.getData(), "someone there".getBytes())) {
socket.send(response);
}
} catch (SocketTimeoutException e) {
continue;
} catch (IOException e) {
e.printStackTrace();
}
}
try {
socket.leaveGroup(group);
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
});
t.run();
}
在设置isRunning = true;
为什么此线程会导致 ANR 错误后,在服务的onCreate
中调用方法multicastLoop
?TCP-服务器-线程运行没有问题 ( while (isRunning) {...}
)
您需要调用t.start();
而不是t.run();
t.run()
只会在导致 ANR 的当前线程(UI)上执行Runnable
。