service: restart APRSdroid on boot-up

AndroidManifest.xml

@@ -25,6 +25,7 @@
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.RECORD_AUDIO" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
     <uses-permission android:name="android.permission.VIBRATE"/>
 
     <application android:label="@string/app_name" android:icon="@drawable/icon"
@@ -126,5 +127,11 @@
 		<action android:name="org.aprsdroid.app.SERVICE_STOP" />
 	    </intent-filter>
 	</service>
+	<!-- start the service if applicable on boot -->
+	<receiver android:name=".SystemEventReceiver">
+	    <intent-filter>
+		<action android:name="android.intent.action.BOOT_COMPLETED"/>
+	    </intent-filter>
+	</receiver>
     </application>
 </manifest> 

src/SystemEventReceiver.scala

@@ -0,0 +1,14 @@
+package org.aprsdroid.app
+
+import android.content.{BroadcastReceiver, Context, Intent}
+
+class SystemEventReceiver extends BroadcastReceiver {
+	val TAG = "APRSdroid.SystemEventReceiver"
+
+	override def onReceive(ctx : Context, i : Intent) {
+		android.util.Log.d(TAG, "onReceive: " + i)
+		val prefs = new PrefsWrapper(ctx)
+		if (prefs.getBoolean("service_running", false))
+			ctx.startService(AprsService.intent(ctx, AprsService.SERVICE))
+	}
+}