我正在尝试启动service
然后打开socket
与服务器建立连接。
单击按钮我创建新的Thread
然后开始服务。
Thread t = new Thread(){
public void run(){
mIntent= new Intent(MainActivity.this, ConnectonService.class);
mIntent.putExtra("KEY1", "Value used by the service");
context.startService(mIntent);
}
};
t.start();
Then on service
,我尝试打开socket
并与服务器建立连接
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
//TODO do something useful
try {
InetAddress serverAddr = InetAddress.getByName(SERVER_IP);
socket = new Socket(serverAddr, SERVERPORT);
Scanner scanner = new Scanner(socket.getInputStream());
message = scanner.nextLine();
} catch (IOException e) {
e.printStackTrace();
}
return Service.START_NOT_STICKY;
}
但是当我调用它时,我有error
08-30 08:56:49.268: E/AndroidRuntime(3751): java.lang.RuntimeException: Unable to start service com.example.testofconnection.ConnectonService@40ef02a8 with Intent { cmp=com.example.testofconnection/.ConnectonService (has extras) }: android.os.NetworkOnMainThreadException*
我认为问题在于service
is on main thread
,但我找不到如何在新的(独立)线程上启动服务以保持connection alive
?
您可以使用 IntentService 来实现此目的。只需从主线程使用 Intent 正常启动它即可。onHandleIntent()
方法在后台线程中执行。将您的套接字代码放在那里。这是一个示例代码。
public class MyIntentService extends IntentService {
public MyIntentService() {
super("MyIntentService");
}
@Override
protected void onHandleIntent(Intent intent) {
// this method is called in background thread
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
}
在您的活动中,您按如下方式启动服务。
startService(new Intent(this, MyIntentService.class));
如果您需要持久的服务,您可以创建一个普通的服务并在那里启动一个线程。这是一个例子。确保将其作为“前台”服务启动。这将使服务运行更长时间而不会被 Android 杀死。
public class MyAsyncService extends Service {
private AtomicBoolean working = new AtomicBoolean(true)
private Runnable runnable = new Runnable() {
@Override
public void run() {
while(working.get()) {
// put your socket-code here
...
}
}
}
@Override
public void onCreate() {
// start new thread and you your work there
new Thread(runnable).start();
// prepare a notification for user and start service foreground
Notification notification = ...
// this will ensure your service won't be killed by Android
startForeground(R.id.notification, notification);
}
@Override
public onDestroy() {
working.set(false)
}
}
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