add the ability for briar-android to get the current country.

- this will be useful later for e.g. auto-disabling Tor

briar-android/src/org/briarproject/plugins/tor/TorPlugin.java

@@ -44,6 +44,7 @@ import org.briarproject.util.StringUtils;
 
 import socks.Socks5Proxy;
 import socks.SocksSocket;
+import android.annotation.SuppressLint;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
@@ -275,6 +276,7 @@ class TorPlugin implements DuplexPlugin, EventHandler {
 		out.close();
 	}
 
+	@SuppressLint("NewApi")
 	private boolean setExecutable(File f) {
 		if(Build.VERSION.SDK_INT >= 9) {
 			return f.setExecutable(true, true);

briar-android/src/org/briarproject/system/AndroidLocationUtils.java

@@ -0,0 +1,46 @@
+package org.briarproject.system;
+
+import java.util.Locale;
+import java.util.logging.Logger;
+
+import org.briarproject.api.system.LocationUtils;
+
+import roboguice.inject.ContextSingleton;
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.telephony.TelephonyManager;
+import android.text.TextUtils;
+
+import com.google.inject.Inject;
+
+@ContextSingleton
+class AndroidLocationUtils implements LocationUtils {
+
+	private static final Logger LOG =
+			Logger.getLogger(AndroidLocationUtils.class.getName());
+
+	final Context context;
+	
+	@Inject
+	public AndroidLocationUtils(Context context) {
+		this.context = context;
+	}
+	
+	@SuppressLint("DefaultLocale")
+	@Override
+	public String getCurrentCountry() {
+		String countryCode;
+		countryCode = getCountryFromPhoneNetwork();
+		if (!TextUtils.isEmpty(countryCode)) {
+			return countryCode.toUpperCase(); // android api gives lowercase for some reason
+		}
+		LOG.warning("Could not determine current country; fall back to user-defined locale");
+		return Locale.getDefault().getCountry();
+	}
+	
+	String getCountryFromPhoneNetwork() {
+		TelephonyManager tm = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
+		return tm.getNetworkCountryIso();
+	}
+	
+}

briar-android/src/org/briarproject/system/AndroidSystemModule.java

@@ -2,6 +2,7 @@ package org.briarproject.system;
 
 import org.briarproject.api.system.Clock;
 import org.briarproject.api.system.FileUtils;
+import org.briarproject.api.system.LocationUtils;
 import org.briarproject.api.system.SeedProvider;
 import org.briarproject.api.system.Timer;
 
@@ -14,5 +15,6 @@ public class AndroidSystemModule extends AbstractModule {
 		bind(Timer.class).to(SystemTimer.class);
 		bind(SeedProvider.class).to(AndroidSeedProvider.class);
 		bind(FileUtils.class).to(AndroidFileUtils.class);
+		bind(LocationUtils.class).to(AndroidLocationUtils.class);
 	}
 }

briar-api/src/org/briarproject/api/system/LocationUtils.java

@@ -0,0 +1,8 @@
+package org.briarproject.api.system;
+
+public interface LocationUtils {
+	
+	/** Get the country the device is currently-located in. */
+	String getCurrentCountry();
+
+}