Add a toolbar menu with back and refresh buttons

Change theme just to make the refresh button visible without
changing its color.

AndroidManifest.xml

@@ -14,7 +14,7 @@
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
-        android:theme="@style/Theme.AppCompat.Light">
+        android:theme="@style/Theme.AppCompat.Light.DarkActionBar">
 
         <activity
             android:name=".UpdatesActivity"

res/drawable/ic_menu_refresh.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M17.65 6.35C16.2 4.9 14.21 4 12 4c-4.42 0-7.99 3.58-7.99 8s3.57 8 7.99 8c3.73 0 6.84-2.55 7.73-6h-2.08c-.82 2.33-3.04 4-5.65 4-3.31 0-6-2.69-6-6s2.69-6 6-6c1.66 0 3.14.69 4.22 1.78L13 11h7V4l-2.35 2.35z" />
+</vector>

res/menu/menu_toolbar.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item
+        android:id="@+id/menu_refresh"
+        android:icon="@drawable/ic_menu_refresh"
+        android:title="@string/menu_refresh"
+        app:showAsAction="always" />
+</menu>

res/values/strings.xml

@@ -48,4 +48,6 @@
     <string name="preparing_ota_first_boot">Preparing for first boot</string>
 
     <string name="reboot">Reboot</string>
+
+    <string name="menu_refresh">Refresh</string>
 </resources>

src/org/lineageos/updater/UpdatesActivity.java

@@ -25,15 +25,19 @@ import android.os.Bundle;
 import android.os.IBinder;
 import android.support.v4.content.LocalBroadcastManager;
 import android.support.v7.app.AppCompatActivity;
+import android.support.v7.preference.PreferenceManager;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.support.v7.widget.SimpleItemAnimator;
 import android.util.Log;
+import android.view.Menu;
+import android.view.MenuItem;
 
 import org.json.JSONException;
 import org.lineageos.updater.controller.UpdaterController;
 import org.lineageos.updater.controller.UpdaterControllerInt;
 import org.lineageos.updater.controller.UpdaterService;
+import org.lineageos.updater.misc.Constants;
 import org.lineageos.updater.misc.Utils;
 
 import java.io.File;
@@ -77,6 +81,8 @@ public class UpdatesActivity extends AppCompatActivity {
                 }
             }
         };
+
+        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
     }
 
     @Override
@@ -102,6 +108,28 @@ public class UpdatesActivity extends AppCompatActivity {
         super.onStop();
     }
 
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        getMenuInflater().inflate(R.menu.menu_toolbar, menu);
+        return super.onCreateOptionsMenu(menu);
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.menu_refresh:
+                downloadUpdatesList();
+                return true;
+        }
+        return super.onOptionsItemSelected(item);
+    }
+
+    @Override
+    public boolean onSupportNavigateUp() {
+        onBackPressed();
+        return true;
+    }
+
     private ServiceConnection mConnection = new ServiceConnection() {
 
         @Override
@@ -174,6 +202,11 @@ public class UpdatesActivity extends AppCompatActivity {
                         try {
                             Log.d(TAG, "List downloaded");
                             loadUpdatesList();
+                            long millis = System.currentTimeMillis();
+                            PreferenceManager.getDefaultSharedPreferences(UpdatesActivity.this)
+                                    .edit()
+                                    .putLong(Constants.PREF_LAST_UPDATE_CHECK, millis)
+                                    .apply();
                             jsonFileTmp.renameTo(jsonFile);
                         } catch (IOException | JSONException e) {
                             Log.e(TAG, "Could not read json", e);