altosdroid: Add multi-tracker support

This lets you view multiple trackers in the offline maps tab (online
maps not done yet), saves state of each tracker to preferences.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/altosdroid/src/org/altusmetrum/AltosDroid/AltosDroidPreferencesBackend.java b/altosdroid/src/org/altusmetrum/AltosDroid/AltosDroidPreferencesBackend.java
index 75676e28..dfc37153 100644
--- a/altosdroid/src/org/altusmetrum/AltosDroid/AltosDroidPreferencesBackend.java
+++ b/altosdroid/src/org/altusmetrum/AltosDroid/AltosDroidPreferencesBackend.java
@@ -44,7 +44,12 @@ public class AltosDroidPreferencesBackend implements AltosPreferencesBackend {
 
 	public String[] keys() {
 		Map<String, ?> all = prefs.getAll();
-		return (String[])all.keySet().toArray();
+		Object[] ao = all.keySet().toArray();
+
+		String[] as = new String[ao.length];
+		for (int i = 0; i < ao.length; i++)
+			as[i] = (String) ao[i];
+		return as;
 	}
 
 	public AltosPreferencesBackend node(String key) {
@@ -104,6 +109,7 @@ public class AltosDroidPreferencesBackend implements AltosPreferencesBackend {
 	}
 
 	public void remove(String key) {
+		AltosDebug.debug("remove preference %s\n", key);
 		editor.remove(key);
 	}