那些讀過我以前的問題的人可能已經知道這一點:我目前正在試圖抓住整個WiFi Direct的東西。我迄今爲止所做的是創建連接。 我想要做的是通過UDP發送一個數據包到groupOwner(這是IP當然是已知的) - 但它似乎每次都會丟失。UDP數據包(通過WiFi Direct)永遠不會到達
這是我的一些代碼,我有一個服務接收文件和intentservice在後臺提交他們:
FileReceiverService.java
@Override
public void run() {
Log.d(TAG, "Thread starting...");
try {
app.log("Opening UDP socket to receive files.");
DatagramSocket socket = new DatagramSocket(PORT);
app.log("Socket open!");
socket.setSoTimeout(5000);
app.log("Waiting for packet..");
while (isRunning && !isInterrupted()) {
DatagramPacket packet = new DatagramPacket(
new byte[WiFiPacket.PACKET_SIZE],
WiFiPacket.PACKET_SIZE);
try {
socket.receive(packet);
app.log("Received " + packet.getLength()
+ " bytes, trying to parse!");
parsePacket(packet);
} catch (SocketTimeoutException e) {
} catch (Exception e) {
app.log("Something went wrong: " + e.getMessage());
e.printStackTrace();
}
}
socket.close();
app.log("Closing UDP socket");
} catch (Exception e) {
e.printStackTrace();
}
}
其中常量WiFiPacket.PACKET_SIZE設置爲1024 * 32(32千字節,因爲我收到了「ERRBLABLA MSG太長」的錯誤,值更高)。
FileTransferService.java
@Override
protected void onHandleIntent(Intent intent) {
App app = (App) getApplication();
Context context = getApplicationContext();
boolean rightIntent = false;
WiFiFile file = null;
if (intent.getAction().equals(ACTION_SEND_TEXT)) {
rightIntent = true;
file = WiFiFile.fromText(intent.getExtras().getString(EXTRAS_TEXT));
} else if (intent.getAction().equals(ACTION_SEND_FILE)) {
rightIntent = true;
file = WiFiFile.fromFile(intent.getExtras().getString(
EXTRAS_FILE_PATH));
}
if (rightIntent && file != null) {
app.getOnWiFiTransmissionChangedListener().onNewOutgoingTransfer(
file);
String text = intent.getExtras().getString(EXTRAS_TEXT);
String host = intent.getExtras().getString(
EXTRAS_GROUP_OWNER_ADDRESS);
DatagramSocket socket = null;
int port = intent.getExtras().getInt(EXTRAS_GROUP_OWNER_PORT);
Log.d(TAG, "Sending packets to " + host + ":" + port);
try {
socket = new DatagramSocket();
int bytesSent = 0;
for (WiFiPacket p : file) {
Log.d(TAG, "Preparing another packet..");
byte[] payload = p.getBytes();
DatagramPacket packet = new DatagramPacket(payload,
payload.length, InetAddress.getByName(host), port);
Log.d(TAG, "Sending packet..");
socket.send(packet);
bytesSent += payload.length;
Log.d(TAG, "Packet send! Contained " + payload.length
+ " bytes! All over we've sent about " + bytesSent
+ " bytes!");
List<WiFiFile> list = new ArrayList<WiFiFile>();
list.add(file);
app.getOnWiFiTransmissionChangedListener()
.onTransferProgressChanged(list);
}
app.getOnWiFiTransmissionChangedListener()
.onFileTransferSuccessful(file);
Log.d(TAG, "Client: Data written");
} catch (IOException e) {
e.printStackTrace();
Log.e(TAG, e.getMessage());
} finally {
if (socket != null) {
if (socket.isConnected()) {
socket.close();
}
}
}
}
}
的代碼可能不是最好的,但是對於現在我關心的唯一事情就是接受這個該死的包。 :)
您的信息:我將類WiFiFile的實例分成WiFiPackets不超過PACKET_SIZE限制,因此包含某種自己的頭文件信息有關文件的偏移量,總長度,發件人(用戶名/ inetaddress)和類似的東西。 我的日誌記錄告訴我發送了大約25KB的字節,socket.send不會拋出任何錯誤,而是調用我的偵聽器(也告訴我傳輸已完成)。 據我所知,UDP數據包很容易丟失,但我已經嘗試了大約10次,我認爲25KB數據包丟失的概率非常小。
你看到我失蹤的任何東西嗎?幾個小時後,我正在盯着我的代碼,試圖找出它,並在其中放入越來越多的調試/日誌語句,但沒有任何進展。
謝謝!
PS:
IP地址和端口是正確的。
PS2:
AndroidManifest.xml中
<uses-feature
android:name="android.hardware.wifi.direct"
android:required="true" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />
<uses-permission android:name="android.permission.CHANGE_COMPONENT_ENABLED_STATE" />