Back button for SettingsAvtivity. Remove tablet specific code.

app/src/main/AndroidManifest.xml

@@ -25,7 +25,12 @@
         </activity>
         <activity
             android:name=".SettingsActivity"
-            android:label="@string/title_activity_settings" />
+            android:label="@string/title_activity_settings">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value=".ControlCenter" />
+        </activity>
+
         <activity
             android:name=".AppManagerActivity"
             android:label="App Manager">

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/SettingsActivity.java

@@ -1,62 +1,24 @@
 package nodomain.freeyourgadget.gadgetbridge;
 
-import android.annotation.TargetApi;
-import android.content.Context;
 import android.content.Intent;
-import android.content.res.Configuration;
-import android.os.Build;
 import android.os.Bundle;
 import android.preference.ListPreference;
 import android.preference.Preference;
 import android.preference.PreferenceActivity;
 import android.preference.PreferenceCategory;
-import android.preference.PreferenceFragment;
 import android.preference.PreferenceManager;
+import android.support.v4.app.NavUtils;
+import android.view.MenuItem;
 
-import java.util.List;
-
-/**
- * A {@link PreferenceActivity} that presents a set of application settings. On
- * handset devices, settings are presented as a single list. On tablets,
- * settings are split by category, with category headers shown to the left of
- * the list of settings.
- * <p/>
- * See <a href="http://developer.android.com/design/patterns/settings.html">
- * Android Design: Settings</a> for design guidelines and the <a
- * href="http://developer.android.com/guide/topics/ui/settings.html">Settings
- * API Guide</a> for more information on developing a Settings UI.
- */
 public class SettingsActivity extends PreferenceActivity {
-    /**
-     * Determines whether to always show the simplified settings UI, where
-     * settings are presented in a single list. When false, settings are shown
-     * as a master/detail two-pane view on tablets. When true, a single pane is
-     * shown on tablets.
-     */
-    private static final boolean ALWAYS_SIMPLE_PREFS = false;
-
-
     @Override
     protected void onPostCreate(Bundle savedInstanceState) {
         super.onPostCreate(savedInstanceState);
-
+        getActionBar().setDisplayHomeAsUpEnabled(true);
         setupSimplePreferencesScreen();
     }
 
-    /**
-     * Shows the simplified settings UI if the device configuration if the
-     * device configuration dictates that a simplified, single-pane UI should be
-     * shown.
-     * shown.
-     */
     private void setupSimplePreferencesScreen() {
-        if (!isSimplePreferences(this)) {
-            return;
-        }
-
-        // In the simplified UI, fragments are not used at all and we instead
-        // use the older PreferenceActivity APIs.
-
         // Add 'general' preferences.
         addPreferencesFromResource(R.xml.pref_general);
 
@@ -82,46 +44,6 @@ public class SettingsActivity extends PreferenceActivity {
         //bindPreferenceSummaryToValue(findPreference("notifications_sms_whenscreenon"));
     }
 
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    public boolean onIsMultiPane() {
-        return isXLargeTablet(this) && !isSimplePreferences(this);
-    }
-
-    /**
-     * Helper method to determine if the device has an extra-large screen. For
-     * example, 10" tablets are extra-large.
-     */
-    private static boolean isXLargeTablet(Context context) {
-        return (context.getResources().getConfiguration().screenLayout
-                & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_XLARGE;
-    }
-
-    /**
-     * Determines whether the simplified settings UI should be shown. This is
-     * true if this is forced via {@link #ALWAYS_SIMPLE_PREFS}, or the device
-     * doesn't have newer APIs like {@link PreferenceFragment}, or the device
-     * doesn't have an extra-large screen. In these cases, a single-pane
-     * "simplified" settings UI should be shown.
-     */
-    private static boolean isSimplePreferences(Context context) {
-        return ALWAYS_SIMPLE_PREFS
-                || Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB
-                || !isXLargeTablet(context);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
-    public void onBuildHeaders(List<Header> target) {
-        if (!isSimplePreferences(this)) {
-            loadHeadersFromResource(R.xml.pref_headers, target);
-        }
-    }
 
     /**
      * A preference value change listener that updates the preference's summary
@@ -174,51 +96,13 @@ public class SettingsActivity extends PreferenceActivity {
                         .getString(preference.getKey(), ""));
     }
 
-    /**
+    @Override
-     * This fragment shows general preferences only. It is used when the
+    public boolean onOptionsItemSelected(MenuItem item) {
-     * activity is showing a two-pane settings UI.
+        switch (item.getItemId()) {
-     */
+            case android.R.id.home:
-    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
+                NavUtils.navigateUpFromSameTask(this);
-    public static class GeneralPreferenceFragment extends PreferenceFragment {
+                return true;
-        @Override
-        public void onCreate(Bundle savedInstanceState) {
-            super.onCreate(savedInstanceState);
-            addPreferencesFromResource(R.xml.pref_general);
-
-            // Bind the summaries of EditText/List/Dialog/Ringtone preferences
-            // to their values. When their values change, their summaries are
-            // updated to reflect the new value, per the Android Design
-            // guidelines.
-            //bindPreferenceSummaryToValue(findPreference("example_text"));
-            //bindPreferenceSummaryToValue(findPreference("example_list"));
-        }
-    }
-
-    /**
-     * This fragment shows notification preferences only. It is used when the
-     * activity is showing a two-pane settings UI.
-     */
-    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
-    public static class NotificationPreferenceFragment extends PreferenceFragment {
-        @Override
-        public void onCreate(Bundle savedInstanceState) {
-            super.onCreate(savedInstanceState);
-            addPreferencesFromResource(R.xml.pref_notification);
-
-            Preference pref = (Preference) findPreference("notifications_generic");
-            pref.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
-                public boolean onPreferenceClick(Preference preference) {
-                    Intent enableIntent = new Intent("android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS");
-                    startActivity(enableIntent);
-                    return true;
-                }
-            });
-
-            // Bind the summaries of EditText/List/Dialog/Ringtone preferences
-            // to their values. When their values change, their summaries are
-            // updated to reflect the new value, per the Android Design
-            // guidelines.
-            //bindPreferenceSummaryToValue(findPreference("notifications_new_message_ringtone"));
         }
+        return super.onOptionsItemSelected(item);
     }
 }