Use a different approach to prevent ForceClose after the application has been put to sleep for a long period of time. Each of the fragments in the Viewer will do their setup in onResume instead of in onCreateView. Further, the ProgressDialogFragment used in the OpenRocketLoaderFragment now exposes a dismissAllowStateLoss method so the dialog can be dismissed if the application is put in the background while loading.

android/AndroidManifest.xml

@@ -56,9 +56,8 @@
                     android:scheme="file" />
             </intent-filter>
         </activity>
-        <activity
-            android:name=".android.rocket.OpenRocketViewer"
-            android:finishOnTaskLaunch="true" />
+        <activity android:name=".android.rocket.OpenRocketViewer"
+            android:windowSoftInputMode="adjustPan" />
         <activity android:name=".android.PreferencesActivity" >
             <intent-filter>
                 <action android:name="net.sf.openrocket.android.PreferencesActivity" />

android/src/net/sf/openrocket/android/rocket/Component.java

@@ -31,13 +31,12 @@ public class Component extends Fragment {
 	}
 
 	@Override
-	public void onActivityCreated(Bundle savedInstanceState) {
-		super.onActivityCreated(savedInstanceState);
-
+	public void onResume() {
+		super.onResume();
 		final OpenRocketDocument rocketDocument = CurrentRocketHolder.getCurrentRocket().getRocketDocument();
 		componentTree.setAdapter( buildAdapter( rocketDocument.getRocket() ) );
 	}
-	
+
 	private ListAdapter buildAdapter( Rocket rocket ) {
 
 		TreeStateManager<RocketComponentWithId> manager = new InMemoryTreeStateManager<RocketComponentWithId>();

android/src/net/sf/openrocket/android/rocket/Configurations.java

@@ -42,6 +42,12 @@ public class Configurations extends ExpandableListFragment {
 		return v;
 	}
 
+	@Override
+	public void onResume() {
+		setup();
+		super.onResume();
+	}
+
 	@Override
 	public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
 		inflater.inflate(R.menu.rocket_viewer_configurations_option_menu, menu);
@@ -59,14 +65,6 @@ public class Configurations extends ExpandableListFragment {
 		}
 	}
 
-	@Override
-	public void onActivityCreated(Bundle savedInstanceState) {
-		super.onActivityCreated(savedInstanceState);
-
-		setup();
-
-	}
-	
 	public void refreshConfigsList() {
 		setup();
 	}

android/src/net/sf/openrocket/android/rocket/OpenRocketLoaderFragment.java

@@ -105,7 +105,7 @@ public class OpenRocketLoaderFragment extends Fragment {
 			AndroidLogWrapper.d(OpenRocketLoaderActivity.class,"Finished loading " + OpenRocketLoaderTask.this);
 			Fragment progress = getActivity().getSupportFragmentManager().findFragmentByTag(PROGRESS_DIALOG_TAG);
 			if ( progress != null ) {
-				((DialogFragment)progress).dismiss();
+				((ProgressDialogFragment)progress).dismissAllowingStateLoss();
 			}
 			if ( listener != null ) {
 				listener.onOpenRocketFileLoaded(result);

android/src/net/sf/openrocket/android/rocket/OpenRocketViewer.java

@@ -10,6 +10,7 @@ import net.sf.openrocket.android.simulation.SimulationChart;
 import net.sf.openrocket.android.simulation.SimulationViewActivity;
 import net.sf.openrocket.android.simulation.SimulationViewFragment;
 import net.sf.openrocket.android.util.AndroidLogWrapper;
+import net.sf.openrocket.document.OpenRocketDocument;
 import net.sf.openrocket.document.Simulation;
 import android.app.AlertDialog;
 import android.content.Intent;
@@ -41,7 +42,17 @@ implements Simulations.OnSimulationSelectedListener
 	protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 
-		setTitle(CurrentRocketHolder.getCurrentRocket().getRocketDocument().getRocket().getName());
+		// If the application sleeps for a long time, the CurrentRocketHolder might get cleaned
+		// up.  When this happens, we cannot restore this state, so instead we just
+		// go home.
+		OpenRocketDocument rocDoc = CurrentRocketHolder.getCurrentRocket().getRocketDocument();
+		if ( rocDoc == null ) {
+			AndroidLogWrapper.d(OpenRocketViewer.class, "No document - go home");
+			ActivityHelpers.goHome(this);
+			finish();
+			return;
+		}
+		setTitle(rocDoc.getRocket().getName());
 		getSupportActionBar().setHomeButtonEnabled(true);
 
 		setContentView(R.layout.openrocketviewer);
@@ -59,10 +70,7 @@ implements Simulations.OnSimulationSelectedListener
 	@Override
 	protected void onResume() {
 		RocketChangedEventHandler handler = new RocketChangedEventHandler();
-		// Fire change notices so the displayed lists get updated.
-		// This is primarily because simulations run in the background
-		handler.doSimsChanged();
-		CurrentRocketHolder.getCurrentRocket().setHandler( handler );
+		CurrentRocketHolder.getCurrentRocket().setHandler(handler);
 		super.onResume();
 	}
 

android/src/net/sf/openrocket/android/rocket/Overview.java

@@ -55,6 +55,11 @@ implements SharedPreferences.OnSharedPreferenceChangeListener
 		SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
 		prefs.registerOnSharedPreferenceChangeListener(this);
 
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
 		setup();
 
 	}

android/src/net/sf/openrocket/android/rocket/Simulations.java

@@ -87,6 +87,11 @@ implements SharedPreferences.OnSharedPreferenceChangeListener
 		SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
 		prefs.registerOnSharedPreferenceChangeListener(this);
 
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
 		setup();
 
 	}

android/src/net/sf/openrocket/android/util/ProgressDialogFragment.java

@@ -1,5 +1,7 @@
 package net.sf.openrocket.android.util;
 
+import java.lang.reflect.Method;
+
 import android.app.ProgressDialog;
 import android.os.Bundle;
 import android.support.v4.app.DialogFragment;
@@ -18,6 +20,18 @@ public class ProgressDialogFragment extends DialogFragment {
 		return fragment;
 	}
 
+	/**
+	 * Expose the private method to allow dismissing a dialog after saveInstanceState.
+	 */
+	public void dismissAllowingStateLoss() {
+		try {
+			Method dismissInternalMethod = ProgressDialogFragment.class.getMethod("dismissInternal", Boolean.class);
+			dismissInternalMethod.setAccessible(true);
+			dismissInternalMethod.invoke(this, true);
+		} catch (Exception ex ) {
+			AndroidLogWrapper.d(ProgressDialogFragment.class, "Exception calling dismissAllowingStateInteral");
+		}
+	}
 
 	@Override
 	public void onCreate(Bundle savedInstanceState) {