Main activity: Add a showcase for adding an account.

Turn it off by default if upgrading to this version, because this means
the user most likely already knows how to add an account.

app/build.gradle

@@ -126,6 +126,9 @@ dependencies {
     compile 'com.android.support:preference-v14:25.+'
 
     compile 'com.github.yukuku:ambilwarna:2.0.1'
+    compile ('com.github.worker8:tourguide:1.0.17-SNAPSHOT@aar'){
+         transitive=true
+    }
 
     compile 'io.requery:requery:1.2.0'
     compile 'io.requery:requery-android:1.2.0'

app/src/main/java/com/etesync/syncadapter/App.java

@@ -44,6 +44,8 @@ import com.etesync.syncadapter.model.ServiceDB;
 import com.etesync.syncadapter.model.Settings;
 import com.etesync.syncadapter.resource.LocalAddressBook;
 import com.etesync.syncadapter.resource.LocalCalendar;
+import com.etesync.syncadapter.ui.AccountsActivity;
+import com.etesync.syncadapter.utils.HintManager;
 
 import net.fortuna.ical4j.util.UidGenerator;
 
@@ -289,6 +291,10 @@ public class App extends Application {
                 }
             }
         }
+
+        if (fromVersion < 10) {
+            HintManager.setHintSeen(this, AccountsActivity.HINT_ACCOUNT_ADD, true);
+        }
     }
 
     public static class AppUpdatedReceiver extends BroadcastReceiver {

app/src/main/java/com/etesync/syncadapter/ui/AccountsActivity.java

@@ -21,6 +21,7 @@ import android.support.v4.widget.DrawerLayout;
 import android.support.v7.app.ActionBarDrawerToggle;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
+import android.view.Gravity;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.Toast;
@@ -28,12 +29,20 @@ import android.widget.Toast;
 import com.etesync.syncadapter.Constants;
 import com.etesync.syncadapter.R;
 import com.etesync.syncadapter.ui.setup.LoginActivity;
+import com.etesync.syncadapter.utils.HintManager;
+import com.etesync.syncadapter.utils.ShowcaseBuilder;
+
+import tourguide.tourguide.Overlay;
+import tourguide.tourguide.Pointer;
+import tourguide.tourguide.ToolTip;
+import tourguide.tourguide.TourGuide;
 
 import static android.content.ContentResolver.SYNC_OBSERVER_TYPE_SETTINGS;
 import static com.etesync.syncadapter.BuildConfig.DEBUG;
 import static com.etesync.syncadapter.Constants.serviceUrl;
 
 public class AccountsActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, SyncStatusObserver {
+    public static final HintManager.Hint HINT_ACCOUNT_ADD = HintManager.registerHint("AddAccount");
 
     private Snackbar syncStatusSnackbar;
     private Object syncStatusObserver;
@@ -77,6 +86,13 @@ public class AccountsActivity extends AppCompatActivity implements NavigationVie
         }
 
         PermissionsActivity.requestAllPermissions(this);
+
+        if (!HintManager.getHintSeen(this, HINT_ACCOUNT_ADD)) {
+            ShowcaseBuilder.getBuilder(this)
+                    .setToolTip(new ToolTip().setTitle(getString(R.string.tourguide_title)).setDescription(getString(R.string.accounts_showcase_add)).setGravity(Gravity.TOP | Gravity.LEFT))
+                    .playOn(fab);
+            HintManager.setHintSeen(this, HINT_ACCOUNT_ADD, true);
+        }
     }
 
     @Override

app/src/main/java/com/etesync/syncadapter/utils/ShowcaseBuilder.java

@@ -0,0 +1,23 @@
+package com.etesync.syncadapter.utils;
+
+import android.app.Activity;
+import android.view.View;
+
+import tourguide.tourguide.Overlay;
+import tourguide.tourguide.Pointer;
+import tourguide.tourguide.TourGuide;
+
+public class ShowcaseBuilder {
+    public static TourGuide getBuilder(Activity activity) {
+        final TourGuide ret = TourGuide.init(activity).with(TourGuide.Technique.Click)
+                .setPointer(new Pointer());
+        ret.setOverlay(new Overlay().setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                ret.cleanUp();
+            }
+        }));
+
+        return ret;
+    }
+}

app/src/main/res/values/strings.xml

@@ -16,6 +16,9 @@
     <string name="please_wait">Please wait …</string>
     <string name="send">Send</string>
 
+    <!-- tourguide -->
+    <string name="tourguide_title">Did you know?</string>
+
     <!-- startup dialogs -->
     <string name="startup_battery_optimization">Battery Optimization</string>
     <string name="startup_battery_optimization_message">Android may disable/reduce EteSync synchronization after a few days. To prevent this, turn off battery optimization.</string>
@@ -49,9 +52,10 @@
     <string name="navigation_drawer_report_issue">Report issue</string>
     <string name="navigation_drawer_contact">Contact developer</string>
 
-    <string name="account_list_empty">Welcome to EteSync!\n\nAdd an account to start.</string>
+    <string name="account_list_empty">Welcome to EteSync!</string>
     <string name="accounts_global_sync_disabled">System-wide automatic synchronization is disabled</string>
     <string name="accounts_global_sync_enable">Enable</string>
+    <string name="accounts_showcase_add">You need to add an account in order to use EteSync. Click here to add one...</string>
 
     <!-- AccountUpdateService -->