Split preferences into different screens to make them simpler, and enable and disable screens depending on options selected.

app/src/main/java/uk/org/openseizuredetector/PrefActivity.java

@@ -24,14 +24,138 @@
 */
 
 package uk.org.openseizuredetector;
+
+import android.content.SharedPreferences;
 import android.preference.PreferenceActivity;
 import android.os.Bundle;
+import android.preference.PreferenceFragment;
+import android.preference.PreferenceManager;
+import android.util.Log;
+import android.widget.Toast;
+
+import java.util.List;
 
 public class PrefActivity extends PreferenceActivity {
+    private String TAG = "PreferenceActivity";
+
     @Override
-    public void onCreate(Bundle savedInstanceState) {
+    protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-    
-        addPreferencesFromResource(R.xml.prefs);
     }
+
+    /**
+     * Populate the activity with the top-level headers.
+     */
+    @Override
+    public void onBuildHeaders(List<Header> target) {
+        loadHeadersFromResource(R.xml.preference_headers, target);
+
+        SharedPreferences SP = PreferenceManager
+                .getDefaultSharedPreferences(this.getApplicationContext());
+        String dataSourceStr = SP.getString("DataSource", "pebble");
+        Log.v(TAG, "onBuildHeaders DataSource = " + dataSourceStr);
+
+        Boolean cameraEnabled = SP.getBoolean("UseIpCamera", false);
+        Log.v(TAG, "onBuildHeaders cameraEnabled = " + cameraEnabled);
+
+        for (int i = 0; i < target.size(); i++) {
+            Header h = target.get(i);
+            Log.v(TAG,"found - "+h.title.toString());
+            if (h.title.toString().equals("Pebble Datasource")) {
+                Log.v(TAG, "found Pebble Datasource Header");
+                if (!dataSourceStr.equals("pebble")) {
+                    Log.v(TAG, "Removing pebble settings header");
+                    target.remove(i);
+                    i = i-1;
+                }
+            }
+            if (h.title.toString().equals("Network Datasource")) {
+                Log.v(TAG, "found Network Datasource Header");
+                if (!dataSourceStr.equals("network")) {
+                    Log.v(TAG, "Removing network settings header");
+                    target.remove(i);
+                    i = i -1;
+                }
+            }
+            if (h.title.toString().equals("Camera Settings")) {
+                Log.v(TAG, "found Camera Settings Header");
+                if (!cameraEnabled) {
+                    Log.v(TAG, "Removing camera settings header");
+                    target.remove(i);
+                    i = i-1;
+                }
+            }
+        }
+
+    }
+
+    @Override
+    public void onStart() {
+        super.onStart();
+        invalidateHeaders();
+        Log.v(TAG, "onStart()");
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Log.v(TAG, "onStart()");
+    }
+
+    /**
+     * This fragment shows the preferences for the first header.
+     */
+    public static class GeneralPrefsFragment extends PreferenceFragment {
+        @Override
+        public void onCreate(Bundle savedInstanceState) {
+            super.onCreate(savedInstanceState);
+            // Load the preferences from an XML resource
+            addPreferencesFromResource(R.xml.general_prefs);
+        }
+    }
+
+    /**
+     * This fragment contains a second-level set of preference that you
+     * can get to by tapping an item in the first preferences fragment.
+     */
+    public static class AlarmPrefsFragment extends PreferenceFragment {
+        @Override
+        public void onCreate(Bundle savedInstanceState) {
+            super.onCreate(savedInstanceState);
+
+            // Load the preferences from an XML resource
+            addPreferencesFromResource(R.xml.alarm_prefs);
+        }
+    }
+
+    public static class PebbleDatasourcePrefsFragment extends PreferenceFragment {
+        @Override
+        public void onCreate(Bundle savedInstanceState) {
+            super.onCreate(savedInstanceState);
+
+            // Load the preferences from an XML resource
+            addPreferencesFromResource(R.xml.pebble_datasource_prefs);
+        }
+    }
+
+    public static class NetworkDatasourcePrefsFragment extends PreferenceFragment {
+        @Override
+        public void onCreate(Bundle savedInstanceState) {
+            super.onCreate(savedInstanceState);
+
+            // Load the preferences from an XML resource
+            addPreferencesFromResource(R.xml.network_datasource_prefs);
+        }
+    }
+
+    public static class CameraPrefsFragment extends PreferenceFragment {
+        @Override
+        public void onCreate(Bundle savedInstanceState) {
+            super.onCreate(savedInstanceState);
+
+            // Load the preferences from an XML resource
+            addPreferencesFromResource(R.xml.camera_prefs);
+        }
+    }
+
 }