在我的Android應用程序中使用讀取方法

Question

所以我創建了一個應用程序，其中有一個GUI類。此應用程序將偵聽來自另一個應用程序的2個傳入字符串，這些應用程序是在觸發togglebutton時創建的我簡直無法將我的頭包裹起來，就是如何讀取傳入的字節，並將它們通過我的代碼傳回到它們在GUI類中使用的位置。希望任何人都能夠提供幫助。

當我發送我的兩個字符串時，我得到了兩個字節，然後發送第一個字節，獲取「％」字符串的字節，將其作爲分隔符發送，然後發送第二個字節。

public void ListenForAddress(View view) 
{ 
    on = ((ToggleButton) view).isChecked(); 

    if(on) 
    { 
     Address address = reciever.RecieveObject(); 
     Intent intent = new Intent(this, Screen3.class); 
     String adressStr = address.Address; 
     intent.putExtra("ADRESS_MESSAGE", adressStr); 
     String postalcodeStr = address.Postalcode; 
     intent.putExtra("POSTALCODE_MESSAGE", postalcodeStr); 
     intent.putExtra("ONE", 1); 
     startActivity(intent); 
    } 
    else 
    { 
     reciever.closeReception(); 
    } 
} 

正如你可以看到我創建一個接收器，並與我稱之爲叫RecieveObject（）方法，該方法如下所示。

public Address RecieveObject() 
{ 
    accThread = new AcceptThread(); 
    accThread.start(); 
    return null; 
} 

下一步是創建連接並啓動管理線程

public class AcceptThread extends Thread { 


public AcceptThread() { 
    BluetoothServerSocket tmp = null; 
    try { 
    tmp = mBluetoothAdapter.listenUsingRfcommWithServiceRecord("Server", MY_UUID); 
    } catch (IOException e) { } 
    mmServerSocket = tmp; 
} 

public void run() { 
    BluetoothSocket socket = null; 
    while (true) { 
     try { 
      socket = mmServerSocket.accept(); 
     } catch (IOException e) { 
      break; 
     } 
     // If a connection was accepted 
     if (socket != null) { 
      mConnSock = new manageConnectedSocket(socket); 
      mConnSock.read(); 
      try { 
       mmServerSocket.close(); 
      } catch (IOException e) { 
      } 
      break; 
     } 
    } 
} 
} 

的最後一步是線程處理數據

public class manageConnectedSocket extends Thread { 

public manageConnectedSocket(BluetoothSocket socket) { 
    mmSocket = socket; 
    InputStream tmpIn = null; 

    try { 
     tmpIn = socket.getInputStream(); 
    } catch (IOException e) { } 

    mmInStream = tmpIn; 
} 

public Address read() { 
    byte[] buffer = new byte[1024]; 
    int bytes; 
    Address address = new Address("", ""); 
    int count = 0; 

    while(count<2) 
    { 
     try { 
      bytes = mmInStream.read(buffer); 

      if(count==0) 
      { 
       address.Address = new String(buffer); 
      } 
      else 
      { 
       address.Postalcode = new String(buffer); 
      } 
      buffer = new byte[1024]; 

     } catch (IOException e) { 
      break; 
     } 
    } 
    return address; 
} 

} 

Answer 1

當發送地址和線程郵政編碼，在他們之間發送分隔符。它可以是任何不會出現在地址和郵政編碼中的字符，甚至不會出現在字符序列中，以保證安全。例如：!@#@!。 您應該在一次通話中將數據發送至write。

所以你要發送的地址是這樣的：

String data = address + "!@#@!" + postalCode; 
byte[] bytes = data.getBytes(); 
socket.getOutputStream().write(bytes); 

當讀取的地址，你不應該調用來檢索地址的方法，因爲它會阻止你的線程。相反，當地址準備好時，從連接線程調用一個方法。啓動therad這樣：

manageConnectedSocket(socket).start(); 

在它的run方法，閱讀字符串：

public void run() { 
    byte[] data = new byte[1024]; //You can make this array larger, if you think it won't have enough space to contain some addresses. 
    socket.getInputStream().read(data); //This may block the thread, if no data is currently available. 
    String strings = new String(data); 
    int seperatorIndex = strings.indexOf("!@#@!"); 
    String addressStr = strings.substring(0, seperatorIndex); 
    String postalCode = strings.substring(seperatorIndex + 5); //5 is the length of "!@#@!". 
    Address address = new Address(addressStr, postalCode); 
    makeUseOfAddress(address); //Show it to the user, for example. Remember it's called from this thread, so if you want to interact with your UI, you have to run the interacting code on the UI thread and not here. 
}