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authorKjetil Ørbekk <kjetil.orbekk@gmail.com>2012-01-13 10:18:02 +0100
committerKjetil Ørbekk <kjetil.orbekk@gmail.com>2012-01-13 10:18:02 +0100
commitba7132f3ce5629cff2cc4857fff7bd672511bee8 (patch)
treedc6f7d1adafb8351004f2de6f3f775ebfe596fc7 /same-android/src/main/java/com/orbekk/Broadcast.java
parent85a93de08694f25bd049c5236f11f06b8d8e4ff7 (diff)
Rename projects.
– jsonrpc → same – master → same-android
Diffstat (limited to 'same-android/src/main/java/com/orbekk/Broadcast.java')
-rw-r--r--same-android/src/main/java/com/orbekk/Broadcast.java56
1 files changed, 56 insertions, 0 deletions
diff --git a/same-android/src/main/java/com/orbekk/Broadcast.java b/same-android/src/main/java/com/orbekk/Broadcast.java
new file mode 100644
index 0000000..84b2d6e
--- /dev/null
+++ b/same-android/src/main/java/com/orbekk/Broadcast.java
@@ -0,0 +1,56 @@
+package com.orbekk;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import android.content.Context;
+import android.net.DhcpInfo;
+import android.net.wifi.WifiManager;
+
+public class Broadcast {
+ private Context context;
+ private Logger logger = LoggerFactory.getLogger(getClass());
+
+ public Broadcast(Context context) {
+ this.context = context;
+ }
+
+ public InetAddress getBroadcastAddress() {
+ WifiManager wifi = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);
+ DhcpInfo dhcp = wifi.getDhcpInfo();
+
+ int broadcast = (dhcp.ipAddress & dhcp.netmask) | ~dhcp.netmask;
+ byte[] quads = new byte[4];
+ for (int k = 0; k < 4; k++)
+ quads[k] = (byte) ((broadcast >> k * 8) & 0xFF);
+ try {
+ return InetAddress.getByAddress(quads);
+ } catch (UnknownHostException e) {
+ logger.warn("Failed to find broadcast address.");
+ return null;
+ }
+ }
+
+ public boolean sendBroadcast(byte[] data, int port) {
+ try {
+ DatagramSocket socket = new DatagramSocket(port);
+ socket.setBroadcast(true);
+ DatagramPacket packet = new DatagramPacket(data, data.length, getBroadcastAddress(), port);
+ socket.send(packet);
+ return true;
+ } catch (SocketException e) {
+ logger.warn("Failed to send broadcast.", e.fillInStackTrace());
+ return false;
+ } catch (IOException e) {
+ logger.warn("Error when sending broadcast.", e.fillInStackTrace());
+ return false;
+ }
+ }
+} \ No newline at end of file