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我試圖建立一個Android應用程序，其中兩個手機將能夠發送短信給對方而沒有數據或蜂窩連接，而是使用WiFi連接。我找到here，我需要首先創建一個p2p（wifidirect）連接，然後嘗試使用服務器套接字等待客戶端連接併發送數據。現在，我可以建立p2p連接，但我不能使用套接字來傳輸數據。在客戶端和服務器端，我在我的onPostExecute()方法中得到空結果。我應該如何建立服務器和客戶端？無法連接到服務器套接字來傳輸數據android
我在MainActivity中創建了每個類的對象來啓動客戶端和服務器端。它們都以背景方法執行。
Client task = new Client(MainActivity.this,d.deviceAddress);
task.execute();
sever task = new server(MainActivity.this);
task.execute();
這裏是我的服務器端：
public class server extends AsyncTask<String, String, String>{
InputStream inputstream ;
Socket client;
ByteArrayOutputStream result;
byte[] buffer;
private Context context;
public static InetAddress address;
public static boolean connected;
public server(Context context) {
this.context = context;
}
@Override
protected String doInBackground(String... arg0) {
ServerSocket serverSocket;
//byte[] ipAddress={'5','4','3','1'};
try {
address = InetAddress.getByName("hazel");// i tried to use getByAddress(ipAddress) as well ,no change
serverSocket = new ServerSocket(8888,10,address);
// serverSocket.setSoTimeout(10000);
client = serverSocket.accept();
connected =true;
} catch (IOException e) {
return null;
}
return null;
}
@Override
protected void onPostExecute(String result) {
if (result != null) {
super.onPostExecute(result);
Toast.makeText(context, "result is "+result,Toast.LENGTH_LONG).show();
}
Toast.makeText(context, " is someone connected "+ connected ,Toast.LENGTH_LONG).show();
}
}
下面是客戶端：
public class Client extends AsyncTask<String, String, String> {
Context ctx;
String deviceAddress ;
String sek;
boolean isresolved = false;
InetAddress inetaddress;
Client task = new Client(MainActivity.this,d.deviceAddress);
task.execute();
public Client(MainActivity ctx, String deviceAddress) {
this.ctx = ctx;
this.deviceAddress = deviceAddress;
}
@Override
protected String doInBackground(String... arg0) {
String host="hazel";
int port=8888;
int len;
Socket socket = new Socket();
byte buf[] = new byte[1024];
try {
socket.bind(null);
// byte[] ipAddress={'5','4','3','1'};
inetaddress = InetAddress.getByName("hazel");
InetSocketAddress address = new InetSocketAddress(inetaddress,8888);
isresolved = address.isUnresolved();
// the isresolved will get false value after executing the code
// i think it means that adress has no problem
socket.connect(address,1000);
} catch (SecurityException e) {
Log.v("Exception" , "is " + e);
} catch (Exception e) {
Log.v("Exception" , "is " + e);
}
finally {
if (socket != null) {
if (socket.isConnected()) {
try {
socket.close();
} catch (IOException e) {
Log.v("Exception " , "is " + e);
}
}
}
}
return null;
}
@Override
protected void onPostExecute(String result) {
if (result != null) {
super.onPostExecute(result);
Toast.makeText(ctx, "clientside , result : "+result ,Toast.LENGTH_LONG).show();
}else Toast.makeText(ctx, "result is null :(" , result : "+result ,Toast.LENGTH_LONG).show();
}
}
當我運行服務器端的onPostExecute將與空結果被調用。我期待在連接到服務器的人之後調用onPostExecute。
在客戶端，我在onPostExecute方法上得到一個空結果，同時也是未解析的方法返回false。
我需要首先連接到服務器發送數據，所以任何人都可以指出我的邏輯有什麼問題？我嘗試以不同的方式創建套接字（例如端口，帶主機名的端口，帶有IP地址的端口）並放入serverSocket.accept()，但它不起作用。