AndroidGCS: Refactor the Fragments into their own package to keep the UI

"components" segregated.  Is this good practice though?  It means making a lot
of functions for the API between ObjectManagerActivity and Fragment public.

androidgcs/res/layout/system_alarms.xml

@@ -5,11 +5,17 @@
     android:layout_gravity="center" >
 
     <fragment
-        android:name="org.openpilot.androidgcs.SystemAlarmsFragment"
+        android:name="org.openpilot.androidgcs.fragments.SystemAlarmsFragment"
         android:id="@+id/viewer"
         android:layout_width="wrap_content"
         android:layout_height="match_parent" />
 
+    <fragment
+        android:name="org.openpilot.androidgcs.fragments.PFD"
+        android:id="@+id/pfd"
+        android:layout_width="wrap_content"
+        android:layout_height="match_parent" />
+    
     <TextView
         xmlns:android="http://schemas.android.com/apk/res/android"
         android:id="@+id/system_alarms_status"

androidgcs/src/org/openpilot/androidgcs/ObjectManagerActivity.java

@@ -161,7 +161,9 @@ public abstract class ObjectManagerActivity extends Activity {
 	protected void registerObjectUpdates(UAVObject object) {
 		object.addUpdatedObserver(new ActivityUpdatedObserver(object));
 	}
-	protected void registerObjectUpdates(UAVObject object, ObjectManagerFragment frag) {
+
+	public void registerObjectUpdates(UAVObject object,
+			ObjectManagerFragment frag) {
 		object.addUpdatedObserver(new FragmentUpdatedObserver(object, frag));
 	}
 	protected void registerObjectUpdates(List<List<UAVObject>> objects) {
@@ -326,7 +328,8 @@ public abstract class ObjectManagerActivity extends Activity {
 		}
 
 	} ;
-	void addOnConnectionListenerFragment(ObjectManagerFragment frag) {
+
+	public void addOnConnectionListenerFragment(ObjectManagerFragment frag) {
 		connectionListeners.addObserver(new OnConnectionListener(frag));
 		if (DEBUG) Log.d(TAG, "Connecting " + frag + " there are now " + connectionListeners.countObservers());
 		if (mConnected)

androidgcs/src/org/openpilot/androidgcs/fragments/ObjectManagerFragment.java

@@ -24,8 +24,9 @@
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
-package org.openpilot.androidgcs;
+package org.openpilot.androidgcs.fragments;
 
+import org.openpilot.androidgcs.ObjectManagerActivity;
 import org.openpilot.uavtalk.UAVObject;
 import org.openpilot.uavtalk.UAVObjectManager;
 
@@ -74,12 +75,12 @@ public class ObjectManagerFragment extends Fragment {
 
 
 	// The below methods should all be called by the parent activity at the appropriate times
-    protected void onOPConnected(UAVObjectManager objMngr) {
+	public void onOPConnected(UAVObjectManager objMngr) {
 		this.objMngr = objMngr;
 		if (DEBUG) Log.d(TAG,"onOPConnected");
 	}
 
-	protected void onOPDisconnected() {
+	public void onOPDisconnected() {
 		objMngr = null;
 		if (DEBUG) Log.d(TAG,"onOPDisconnected");
 	}
@@ -87,7 +88,7 @@ public class ObjectManagerFragment extends Fragment {
 	/**
 	 * Called whenever any objects subscribed to via registerObjects
 	 */
-	protected void objectUpdated(UAVObject obj) {
+	public void objectUpdated(UAVObject obj) {
 
 	}
 

androidgcs/src/org/openpilot/androidgcs/fragments/PFD.java

@@ -22,11 +22,14 @@
  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
 
-package org.openpilot.androidgcs;
+package org.openpilot.androidgcs.fragments;
 
+import org.openpilot.androidgcs.AttitudeView;
+import org.openpilot.androidgcs.R;
 import org.openpilot.uavtalk.UAVObject;
 import org.openpilot.uavtalk.UAVObjectManager;
 
+import android.app.Activity;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.LayoutInflater;
@@ -65,18 +68,25 @@ public class PFD extends ObjectManagerFragment {
 	 * Called whenever any objects subscribed to via registerObjects
 	 */
 	@Override
-	protected void objectUpdated(UAVObject obj) {
+	public void objectUpdated(UAVObject obj) {
 		if (DEBUG)
 			Log.d(TAG, "Updated");
 
 		double pitch = obj.getField("Pitch").getDouble();
 		double roll = obj.getField("Roll").getDouble();
 
-		AttitudeView attitude = (AttitudeView) getActivity().findViewById(
-				R.id.attitude_view);
-		attitude.setRoll(roll);
-		attitude.setPitch(pitch);
-		attitude.invalidate();
+		// TODO: These checks, while sensible, are necessary because the
+		// callbacks aren't
+		// removed when we switch to different activities sharing this fragment
+		Activity parent = getActivity();
+		AttitudeView attitude = null;
+		if (parent != null)
+			attitude = (AttitudeView) parent.findViewById(R.id.attitude_view);
+		if (attitude != null) {
+			attitude.setRoll(roll);
+			attitude.setPitch(pitch);
+			attitude.invalidate();
+		}
 
 	}
 

androidgcs/src/org/openpilot/androidgcs/fragments/SystemAlarmsFragment.java

@@ -21,10 +21,11 @@
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
-package org.openpilot.androidgcs;
+package org.openpilot.androidgcs.fragments;
 
 import java.util.List;
 
+import org.openpilot.androidgcs.R;
 import org.openpilot.uavtalk.UAVObject;
 import org.openpilot.uavtalk.UAVObjectField;
 import org.openpilot.uavtalk.UAVObjectManager;
@@ -67,7 +68,7 @@ public class SystemAlarmsFragment extends ObjectManagerFragment {
 	 * Called whenever any objects subscribed to via registerObjects
 	 */
     @Override
-	protected void objectUpdated(UAVObject obj) {
+	public void objectUpdated(UAVObject obj) {
 		if (DEBUG)
 			Log.d(TAG, "Updated");
 		if (obj.getName().compareTo("SystemAlarms") == 0) {