我创建了一个远程服务,该服务照顾所有客户服务器通信。我之所以使用服务,是因为很少有分离的应用程序会使用相同的通信套接字,并且没有其他方法可以在应用程序之间"共享"插座(据我所知)。
服务效果很好,可以启动插座连接并通过它发送int/string,但是我不能将其用作输入(例如readstring()。
我认为问题发生了,因为活动永远不会等待服务的答复。我在我的服务上的ReadString方法的每个部分返回自定义字符串时对其进行了测试。
和代码...
ConnectionRemoteService:
public class ConnectionRemoteService extends Service {
private String deviceID;
private ConnectionThread ct;
@Override
public void onCreate() {
super.onCreate();
//Toast.makeText(this, "Service On.", Toast.LENGTH_LONG).show();
}
@Override
public void onDestroy() {
//Toast.makeText(this, "Service Off.", Toast.LENGTH_LONG).show();
if(ct != null)
ct.close();
}
@Override
public IBinder onBind(Intent intent) {
return myRemoteServiceStub;
}
private ConnectionInterface.Stub myRemoteServiceStub = new ConnectionInterface.Stub() {
public void startConnection(){
WifiManager wm = (WifiManager)getSystemService(Context.WIFI_SERVICE);
deviceID = wm.getConnectionInfo().getMacAddress();
ct = new ConnectionThread(deviceID);
ct.start();
}
public void closeConnection(){
if(ct != null)
ct.close();
}
public void writeInt(int i) throws RemoteException {
if(ct != null)
ct.writeInt(i);
}
public int readInt() throws RemoteException {
if(ct != null)
return ct.readInt();
return 0;
}
public void writeString(String st) throws RemoteException {
if(ct != null)
ct.writeString(st);
}
public String readString() throws RemoteException {
if(ct != null)
return ct.readString();
return null;
}
public String deviceID() throws RemoteException {
return deviceID;
}
public boolean isConnected() throws RemoteException {
return ct.isConnected();
}
};
}
说明:
您可以看到,我只启动"空"服务并等待应用程序绑定。绑定后,我创建了连接线程,以照顾套接字等...所有方法都调用线程方法,以通过套接字输入输出。
连接线:
public class ConnectionThread extends Thread {
private static final int SERVERPORT = 7777;
private static final String SERVERADDRESS = "192.168.1.106";
private String deviceID;
private Socket socket;
private DataInputStream in;
private DataOutputStream out;
private ObjectInputStream inObj;
private ObjectOutputStream outObj;
private boolean isConnected = false;
PingPongThread ppt;
public ConnectionThread(String deviceID) {
super();
this.deviceID = deviceID;
}
@Override
public void run() {
super.run();
open();
}
void open(){
try{
socket = new Socket(SERVERADDRESS,SERVERPORT);
out = new DataOutputStream(socket.getOutputStream());
out.flush();
in = new DataInputStream(socket.getInputStream());
outObj = new ObjectOutputStream(out);
outObj.flush();
inObj = new ObjectInputStream(in);
out.writeUTF(deviceID);
isConnected = true;
ppt = new PingPongThread(SERVERADDRESS, SERVERPORT);
ppt.start();
}
catch(Exception e){
isConnected = false;
System.err.println(e.getMessage());
}
}
public void close(){
try {
if(ppt!=null){
ppt.stopThread();
ppt.notify();
}
if(in!=null)
in.close();
if(out!=null)
out.close();
if(socket!=null)
socket.close();
}
catch(Exception e){
System.err.println(e.getMessage());
}
isConnected = false;
socket=null;
}
public void writeInt(int i){
try {
out.writeInt(i);
out.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
public int readInt(){
try {
int i = in.readInt();
return i;
} catch (IOException e) {
e.printStackTrace();
}
return 0;
}
public void writeString(String st){
try {
out.writeUTF(st);
out.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
public String readString(){
String st = "";
try {
st = in.readUTF();
return st;
} catch (IOException e) {
e.printStackTrace();
}
return st;
}
public boolean isConnected(){
return isConnected;
}
}
说明:
在我的线程中,我创建套接字并初始化所有内/输出对象以稍后使用。(忽略" pingpongthread",这只是一个简单的检查连接的线程。它使用不同的端口,因此不可能是问题...)所有其他方法都非常简单,只需使用in/out对象...
和主要活动:
public class MainLauncherWindow extends Activity {
private ConnectionInterface myRemoteService;
private boolean isServiceBinded = false;
private OnClickListener onclicklistener;
final ServiceConnection conn = new ServiceConnection() {
public void onServiceConnected(ComponentName name, IBinder service) {
myRemoteService = ConnectionInterface.Stub.asInterface(service);
}
public void onServiceDisconnected(ComponentName name) {
myRemoteService = null;
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_launcher_window);
final Button connectButton = (Button)findViewById(R.id.Connect);
final Button disconnectButton = (Button)findViewById(R.id.Disconnect);
startService(new Intent(getApplicationContext(), ConnectionRemoteService.class));
isServiceBinded = bindService(new Intent("com.mainlauncher.ConnectionRemoteService"),conn,Context.BIND_AUTO_CREATE);
//Connect button
onclicklistener = new OnClickListener(){
public void onClick(View v) {
try {
if(isServiceBinded){
myRemoteService.startConnection();
connectButton.setEnabled(false);
disconnectButton.setEnabled(true);
}
} catch (Exception e) {
e.printStackTrace();
}
}
};
connectButton.setOnClickListener(onclicklistener);
//Disconnect button
onclicklistener = new OnClickListener(){
public void onClick(View v) {
connectButton.setEnabled(true);
disconnectButton.setEnabled(false);
try {
if(isServiceBinded)
myRemoteService.closeConnection();
} catch (RemoteException e) {
e.printStackTrace();
}
}
};
disconnectButton.setOnClickListener(onclicklistener);
//read test button
final Button bt1 = (Button)findViewById(R.id.bt1);
onclicklistener = new OnClickListener(){
public void onClick(View v) {
try {
if(isServiceBinded){
myRemoteService.writeString("Testing");
Toast.makeText(v.getContext(), myRemoteService.readString(), Toast.LENGTH_LONG).show();
}
} catch (RemoteException e) {
e.printStackTrace();
}
}
};
bt1.setOnClickListener(onclicklistener);
}
@Override
public void onBackPressed() {
super.onBackPressed();
if(isServiceBinded){
unbindService(conn);
stopService(new Intent(getApplicationContext(), ConnectionRemoteService.class));
isServiceBinded = false;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(isServiceBinded){
unbindService(conn);
stopService(new Intent(getApplicationContext(), ConnectionRemoteService.class));
isServiceBinded = false;
}
}
}
在我的主要活动中,我为连接断开连接和测试按钮创建了按钮。测试按钮将"测试"字符串发送到服务器端。服务器正常工作,获取"测试"字符串,然后将其他字符串返回到客户端。但是"吐司"味精总是空白的。
- 我在没有服务的情况下测试了服务器端,而且效果很好,因此不用担心。
- 我进行了一个带有连接线程的测试,从其ReadString方法返回测试字符串,并且效果很好,意味着线程通过服务返回答案到客户端(所有链条都很好)。
我现在唯一想到的是,该活动永远不会等待服务中的弦,这就是导致问题的原因。
有什么想法?
谢谢lioz。
终于得到了它。我使用了" ercan"方式。
最终解决方案是在我的活动中实现(不在我的线程/服务中)。现在效果很好。感谢您的帮助。
最终代码:
class ReadString extends AsyncTask <String,Object,String>{
@Override
protected String doInBackground(String... params) {
try {
if(isServiceBinded){
String st = myRemoteService.readString();
return st;
}
} catch (RemoteException e) {
e.printStackTrace();
}
return "Nothing";
}
}
class ReadInt extends AsyncTask <Integer,Object,Integer>{
@Override
protected Integer doInBackground(Integer... params) {
try {
if(isServiceBinded){
int i = myRemoteService.readInt();
return i;
}
} catch (RemoteException e) {
e.printStackTrace();
}
return 0;
}
}
使用Android
提供的处理程序类别adnroid链接:http://developer.android.com/reference/android/android/os/handlerthread.html
教程链接:
- http://stephendnicholas.com/archives/42
使用此操作可以为处理程序创建一个新线程并将其传递给服务。因此,服务发送的所有消息都将在新线程中处理,您可以在活动中使用Wait/Notify。
ex:
/* This is running in hadlerThread */
static class IncomingHandler extends Handler
{
public IncomingHandler(Looper looper)
{
super(looper);
}
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case DATA:
//Your code
synchronized (sync) {
if(gotReply == false){
gotReply = true;
sync.notify();
}
}
break;
default:
super.handleMessage(msg);
}
}
}
/* This is running in main thread */
void foo(){
synchronized (sync) {
gotReply = false;
}
Message msg = Message.obtain(null, DATA);
sendMessage(msg);
synchronized (sync) {
if(gotReply == false){
try {
sync.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
尝试使用asynctask代替线程或将线程包装在异步(如果可能的话,我没有尝试过)
这样做可以使您的应用程序等待这样的结果:
class YourClass extends AsyncTask <Bla,Object,Bla>{
doInBackGround(Bla blah){
//do the stuff here
return result;
}
onPostCalculate(Object result){
// use the result.
}
}
查看我的帖子:
显示收到通知的警报或视图。
这将为您提供一种活动的方式,可以使用广播公司聆听活动。如果您想让等待块用户执行其他操作,也可以提出一个简单的模态对话框,该对话可以在超时或收到意图后取消。