Add a FAB to the collection view activity with info about EteSync.

Many users don't understand how EteSync works and think that this replaces
their existing apps. This should make it more obvious that they should
just use the apps they already use.

app/src/main/java/com/etesync/syncadapter/ui/ViewCollectionActivity.kt

@@ -10,6 +10,7 @@ package com.etesync.syncadapter.ui
 
 import android.accounts.Account
 import android.content.Context
+import android.content.DialogInterface
 import android.content.Intent
 import android.os.AsyncTask
 import android.os.Bundle
@@ -25,6 +26,7 @@ import at.bitfire.ical4android.CalendarStorageException
 import at.bitfire.ical4android.TaskProvider
 import at.bitfire.vcard4android.ContactsStorageException
 import com.etesync.syncadapter.App
+import com.etesync.syncadapter.Constants
 import com.etesync.syncadapter.R
 import com.etesync.syncadapter.model.CollectionInfo
 import com.etesync.syncadapter.model.EntryEntity
@@ -36,6 +38,7 @@ import com.etesync.syncadapter.ui.importlocal.ImportActivity
 import com.etesync.syncadapter.ui.journalviewer.ListEntriesFragment
 import com.etesync.syncadapter.utils.HintManager
 import com.etesync.syncadapter.utils.ShowcaseBuilder
+import com.google.android.material.floatingactionbutton.FloatingActionButton
 import tourguide.tourguide.ToolTip
 import java.io.FileNotFoundException
 import java.util.*
@@ -116,6 +119,16 @@ class ViewCollectionActivity : BaseActivity(), Refreshable {
             tourGuide.playOn(title)
             HintManager.setHintSeen(this, HINT_IMPORT, true)
         }
+
+        val fab = findViewById<FloatingActionButton>(R.id.fab)
+        fab.setOnClickListener {
+            AlertDialog.Builder(this)
+                    .setIcon(R.drawable.ic_info_dark)
+                    .setTitle(R.string.use_native_apps_title)
+                    .setMessage(R.string.use_native_apps_body)
+                    .setNegativeButton(R.string.navigation_drawer_guide, { _: DialogInterface, _: Int -> WebViewActivity.openUrl(this, Constants.helpUri) })
+                    .setPositiveButton(android.R.string.yes) { _, _ -> }.show()
+        }
     }
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {

app/src/main/res/layout/view_collection_activity.xml

@@ -1,5 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:orientation="vertical">
@@ -15,25 +19,26 @@
             android:layout_height="wrap_content"
             android:padding="@dimen/activity_margin"
             android:text="@string/change_journal_title"
-        android:textAppearance="?android:attr/textAppearanceMedium"/>
+            android:textAppearance="?android:attr/textAppearanceMedium" />
 
-    <LinearLayout android:layout_width="match_parent"
+        <LinearLayout
+            android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="horizontal"
             android:padding="@dimen/activity_margin">
+
             <TextView
                 android:id="@+id/stats"
                 android:layout_width="0dp"
                 android:layout_height="wrap_content"
                 android:layout_weight="1"
-            android:text="Stats:"/>
+                android:text="Stats:" />
 
             <ProgressBar
                 android:id="@+id/progressBar"
                 android:layout_width="wrap_content"
                 android:layout_height="match_parent"
-            android:layout_gravity="right"
-        />
+                android:layout_gravity="right" />
         </LinearLayout>
 
         <LinearLayout
@@ -41,7 +46,16 @@
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_weight="1"
-        android:orientation="vertical">
+            android:orientation="vertical" />
+
     </LinearLayout>
 
-</LinearLayout>
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
+        android:id="@+id/fab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom|end"
+        android:layout_margin="@dimen/fab_margin"
+        android:src="@drawable/ic_add_light" />
+
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

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

@@ -140,6 +140,8 @@
     <string name="not_allowed_title">Not Allowed</string>
     <string name="edit_owner_only">Only the owner of this collection (%s) is allowed to edit it.</string>
     <string name="members_old_journals_not_allowed">Sharing of old-style journals is not allowed. In order to share this journal, create a new one, and copy its contents over using the \"import\" dialog. If you are experiencing any issues, please contact support.</string>
+    <string name="use_native_apps_title">Did you know?</string>
+    <string name="use_native_apps_body">EteSync seamlessly integrates with Android, so to use it, just use your existing address book and calendar apps!\n\nFor more information, please check out the user guide.</string>
 
     <!-- CollectionMembers -->
     <string name="collection_members_title">Members</string>