我很擅长编写Android应用程序,我想写一段代码,定期播放传感器数据,比如1秒。搜索开源代码我设法编写了一个发送者类,如下所示:
public class Sender extends Thread {
private static final String TAG = "Sending";
private static final int PORT = 12346;
private static final int TIMEOUT_MS = 500;
private static final int BUF_SIZE = 1024;
private WifiManager mWifi;
Sender(WifiManager wifi) {
mWifi = wifi;
}
public void run() {
try {
DatagramSocket socket = new DatagramSocket(PORT);
socket.setBroadcast(true);
socket.setSoTimeout(TIMEOUT_MS);
sendData(socket);
socket.close();
Thread.sleep(1000);
}
catch (IOException ioe) {
Log.e(TAG, "Couldn't send data", ioe);
}
catch (InterruptedException ie) {
Log.e(TAG, "Can't sleep", ie);
}
}
private void sendData(DatagramSocket socket) throws IOException {
byte[] buf = new byte[BUF_SIZE];
buf = object.toString().getBytes();
InetAddress addr = InetAddress.getByName("192.168.0.255"); // TO FIX
DatagramPacket packet = new DatagramPacket(buf, buf.length, addr, PORT);
socket.send(packet);
}
public void main(String[] args) {
new Sender(null).start();
while (true) {
}
}
}
以下是我在onCreate方法中启动它的方法:
public void onCreate(Bundle savedInstanceState) {
...
new Sender((WifiManager) getSystemService(Context.WIFI_SERVICE)).start();
...
}
现在,如果我在笔记本电脑上打开Wireshark,我只看到应用程序启动时发送的一个数据包而不是每一秒。
有人可以指出我做错了吗?老实说,我对线程和东西并不熟悉,所以我可能只是遗漏了一些明显的东西......
好的,所以必须循环run方法。请参阅以下答案中的更正代码。
答案 0 :(得分:2)
这是更正的运行方法代码:
public void run() {
while (true) {
try {
DatagramSocket socket = new DatagramSocket(PORT);
socket.setBroadcast(true);
socket.setSoTimeout(TIMEOUT_MS);
sendData(socket);
socket.close();
Thread.sleep(1000);
}
catch (IOException ioe) {
Log.e(TAG, "Couldn't send data", ioe);
}
catch (InterruptedException ie) {
Log.e(TAG, "Can't sleep", ie);
}
}
}