add some initial things related to Google Sync, obtaining the account name

app/build.gradle

@@ -36,6 +36,15 @@ dependencies {
     compile 'joda-time:joda-time:2.9.1'
     compile 'com.facebook.stetho:stetho:1.4.1'
     compile 'com.bignerdranch.android:recyclerview-multiselect:0.2'
+
+    compile 'com.google.android.gms:play-services-auth:10.0.1'
+    compile('com.google.api-client:google-api-client-android:1.22.0') {
+        exclude group: 'org.apache.httpcomponents'
+    }
+    compile('com.google.apis:google-api-services-calendar:v3-rev230-1.22.0') {
+        exclude group: 'org.apache.httpcomponents'
+    }
+
     compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
 }
 

app/src/main/AndroidManifest.xml

@@ -7,6 +7,9 @@
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
     <uses-permission android:name="android.permission.VIBRATE"/>
 
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
+
     <application
         android:name=".App"
         android:allowBackup="true"

app/src/main/kotlin/com/simplemobiletools/calendar/activities/SettingsActivity.kt

@@ -1,14 +1,21 @@
 package com.simplemobiletools.calendar.activities
 
-import android.app.Activity
+import android.Manifest
+import android.accounts.AccountManager
 import android.content.Intent
+import android.content.pm.PackageManager
 import android.media.RingtoneManager
 import android.net.Uri
 import android.os.Bundle
 import android.os.Parcelable
+import android.support.v4.app.ActivityCompat
+import android.support.v4.content.ContextCompat
 import android.view.View
 import android.widget.AdapterView
 import android.widget.ArrayAdapter
+import com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential
+import com.google.api.client.util.ExponentialBackOff
+import com.google.api.services.calendar.CalendarScopes
 import com.simplemobiletools.calendar.R
 import com.simplemobiletools.calendar.extensions.config
 import com.simplemobiletools.calendar.extensions.getDefaultReminderTypeIndex
@@ -21,11 +28,17 @@ import com.simplemobiletools.commons.extensions.*
 import kotlinx.android.synthetic.main.activity_settings.*
 
 class SettingsActivity : SimpleActivity() {
-    val GET_RINGTONE_URI = 1
+    private val GET_RINGTONE_URI = 1
+    private val ACCOUNTS_PERMISSION = 2
+    private val REQUEST_ACCOUNT = 3
+
+    lateinit var credential: GoogleAccountCredential
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_settings)
+
+        credential = GoogleAccountCredential.usingOAuth2(this, arrayListOf(CalendarScopes.CALENDAR_READONLY)).setBackOff(ExponentialBackOff())
     }
 
     override fun onResume() {
@@ -33,6 +46,7 @@ class SettingsActivity : SimpleActivity() {
 
         setupCustomizeColors()
         setupSundayFirst()
+        setupGoogleSync()
         setupWeeklyStart()
         setupWeeklyEnd()
         setupWeekNumbers()
@@ -48,6 +62,20 @@ class SettingsActivity : SimpleActivity() {
         }
     }
 
+    private fun setupGoogleSync() {
+        settings_google_sync.isChecked = config.googleSync
+        settings_google_sync_holder.setOnClickListener {
+            settings_google_sync.toggle()
+            config.googleSync = settings_google_sync.isChecked
+
+            if (settings_google_sync.isChecked) {
+                if (config.syncAccountName.isEmpty()) {
+                    checkGetAccountsPermission()
+                }
+            }
+        }
+    }
+
     private fun setupSundayFirst() {
         settings_sunday_first.isChecked = config.isSundayFirst
         settings_sunday_first_holder.setOnClickListener {
@@ -185,7 +213,7 @@ class SettingsActivity : SimpleActivity() {
     }
 
     override fun onActivityResult(requestCode: Int, resultCode: Int, resultData: Intent?) {
-        if (resultCode == Activity.RESULT_OK && requestCode == GET_RINGTONE_URI) {
+        if (resultCode == RESULT_OK && requestCode == GET_RINGTONE_URI) {
             val uri = resultData?.getParcelableExtra<Parcelable>(RingtoneManager.EXTRA_RINGTONE_PICKED_URI)
             if (uri == null) {
                 config.reminderSound = ""
@@ -193,6 +221,34 @@ class SettingsActivity : SimpleActivity() {
                 settings_reminder_sound.text = RingtoneManager.getRingtone(this, uri as Uri).getTitle(this)
                 config.reminderSound = uri.toString()
             }
+        } else if (resultCode == RESULT_OK && requestCode == REQUEST_ACCOUNT && resultData?.extras != null) {
+            val accountName = resultData!!.getStringExtra(AccountManager.KEY_ACCOUNT_NAME)
+            config.syncAccountName = accountName
+            credential.selectedAccountName = accountName
+        }
+    }
+
+    private fun checkGetAccountsPermission() {
+        if (ContextCompat.checkSelfPermission(this, Manifest.permission.GET_ACCOUNTS) == PackageManager.PERMISSION_GRANTED) {
+            ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.GET_ACCOUNTS), ACCOUNTS_PERMISSION)
+        } else {
+            showAccountChooser()
+        }
+    }
+
+    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
+
+        if (requestCode == ACCOUNTS_PERMISSION) {
+            if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                showAccountChooser()
+            }
+        }
+    }
+
+    private fun showAccountChooser() {
+        if (config.syncAccountName.isEmpty()) {
+            startActivityForResult(credential.newChooseAccountIntent(), REQUEST_ACCOUNT)
         }
     }
 }

app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Config.kt

@@ -59,6 +59,14 @@ class Config(context: Context) : BaseConfig(context) {
             prefs.edit().putInt(REMINDER_MINUTES, mins).apply()
         }
 
+    var googleSync: Boolean
+        get() = prefs.getBoolean(GOOGLE_SYNC, false)
+        set(googleSync) = prefs.edit().putBoolean(GOOGLE_SYNC, googleSync).apply()
+
+    var syncAccountName: String
+        get() = prefs.getString(SYNC_ACCOUNT_NAME, "")
+        set(syncAccountName) = prefs.edit().putString(SYNC_ACCOUNT_NAME, syncAccountName).apply()
+
     fun getDefaultNotificationSound(): String {
         try {
             return RingtoneManager.getActualDefaultRingtoneUri(context, RingtoneManager.TYPE_NOTIFICATION)?.toString() ?: ""

app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Constants.kt

@@ -39,6 +39,8 @@ val REMINDER_SOUND = "reminder_sound"
 val VIEW = "view"
 val REMINDER_TYPE = "reminder_type"
 val REMINDER_MINUTES = "reminder_minutes"
+val GOOGLE_SYNC = "google_sync"
+val SYNC_ACCOUNT_NAME = "sync_account_name"
 
 val letterIDs = intArrayOf(R.string.sunday_letter, R.string.monday_letter, R.string.tuesday_letter, R.string.wednesday_letter,
         R.string.thursday_letter, R.string.friday_letter, R.string.saturday_letter)

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

@@ -31,7 +31,7 @@
         </RelativeLayout>
 
         <RelativeLayout
-            android:id="@+id/settings_sunday_first_holder"
+            android:id="@+id/settings_google_sync_holder"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_marginTop="@dimen/medium_margin"
@@ -39,14 +39,14 @@
             android:padding="@dimen/activity_margin">
 
             <com.simplemobiletools.commons.views.MySwitchCompat
-                android:id="@+id/settings_sunday_first"
+                android:id="@+id/settings_google_sync"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:background="@null"
                 android:clickable="false"
                 android:paddingLeft="@dimen/medium_margin"
                 android:paddingStart="@dimen/medium_margin"
-                android:text="@string/sunday_first"/>
+                android:text="@string/google_sync"/>
 
         </RelativeLayout>
 
@@ -105,6 +105,26 @@
 
         </RelativeLayout>
 
+        <RelativeLayout
+            android:id="@+id/settings_sunday_first_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/medium_margin"
+            android:background="?attr/selectableItemBackground"
+            android:padding="@dimen/activity_margin">
+
+            <com.simplemobiletools.commons.views.MySwitchCompat
+                android:id="@+id/settings_sunday_first"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:background="@null"
+                android:clickable="false"
+                android:paddingLeft="@dimen/medium_margin"
+                android:paddingStart="@dimen/medium_margin"
+                android:text="@string/sunday_first"/>
+
+        </RelativeLayout>
+
         <RelativeLayout
             android:id="@+id/settings_start_weekly_at_holder"
             android:layout_width="match_parent"

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

@@ -73,6 +73,7 @@
     <string name="no_ringtone_picker">No app capable of setting ringtone found</string>
     <string name="no_ringtone_selected">Kein Klingelton gewählt</string>
     <string name="day_end_before_start">The day cannot end earlier than it starts</string>
+    <string name="google_sync">Google sync</string>
 
     <plurals name="events_deleted">
         <item quantity="one">1 Termin gelöscht</item>

app/src/main/res/values-es-rES/strings.xml

@@ -73,6 +73,7 @@
     <string name="no_ringtone_picker">No app capable of setting ringtone found</string>
     <string name="no_ringtone_selected">None</string>
     <string name="day_end_before_start">The day cannot end earlier than it starts</string>
+    <string name="google_sync">Google sync</string>
 
     <plurals name="events_deleted">
         <item quantity="one">1 evento borrado</item>

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

@@ -73,6 +73,7 @@
     <string name="no_ringtone_picker">Aucune application capable de configurer la sonnerie trouvée</string>
     <string name="no_ringtone_selected">None</string>
     <string name="day_end_before_start">The day cannot end earlier than it starts</string>
+    <string name="google_sync">Google sync</string>
 
     <plurals name="events_deleted">
         <item quantity="one">1 événement supprimé</item>

app/src/main/res/values-hi-rIN/strings.xml

@@ -73,6 +73,7 @@
     <string name="no_ringtone_picker">No app capable of setting ringtone found</string>
     <string name="no_ringtone_selected">None</string>
     <string name="day_end_before_start">The day cannot end earlier than it starts</string>
+    <string name="google_sync">Google sync</string>
 
     <plurals name="events_deleted">
         <item quantity="one">1 इवेंट डिलीट किया गया</item>

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

@@ -73,6 +73,7 @@
     <string name="no_ringtone_picker">No app capable of setting ringtone found</string>
     <string name="no_ringtone_selected">None</string>
     <string name="day_end_before_start">The day cannot end earlier than it starts</string>
+    <string name="google_sync">Google sync</string>
 
     <plurals name="events_deleted">
         <item quantity="one">1 bejegyzés törölve</item>

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

@@ -73,6 +73,7 @@
     <string name="no_ringtone_picker">No app capable of setting ringtone found</string>
     <string name="no_ringtone_selected">None</string>
     <string name="day_end_before_start">The day cannot end earlier than it starts</string>
+    <string name="google_sync">Google sync</string>
 
     <plurals name="events_deleted">
         <item quantity="one">1 evento eliminato</item>

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

@@ -73,6 +73,7 @@
     <string name="no_ringtone_picker">לא נמצאה אפליקציה להגדרת רינגטון</string>
     <string name="no_ringtone_selected">ללא</string>
     <string name="day_end_before_start">היום לא יכול להסתיים מוקדם משהוא מתחיל</string>
+    <string name="google_sync">Google sync</string>
 
     <plurals name="events_deleted">
         <item quantity="one">אירוע אחד נמחק</item>

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

@@ -73,6 +73,7 @@
     <string name="no_ringtone_picker">No app capable of setting ringtone found</string>
     <string name="no_ringtone_selected">None</string>
     <string name="day_end_before_start">The day cannot end earlier than it starts</string>
+    <string name="google_sync">Google sync</string>
 
     <plurals name="events_deleted">
         <item quantity="one">1 イベントを削除しました</item>

app/src/main/res/values-pt-rPT/strings.xml

@@ -73,6 +73,7 @@
     <string name="no_ringtone_picker">Não foi encontrada qualquer aplicação capaz de definir o som</string>
     <string name="no_ringtone_selected">Nenhum</string>
     <string name="day_end_before_start">O dia final não pode ser antes do inicial</string>
+    <string name="google_sync">Google sync</string>
 
     <plurals name="events_deleted">
         <item quantity="one">1 evento apagado</item>

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

@@ -73,6 +73,7 @@
     <string name="no_ringtone_picker">Не найдено приложение для выбора рингтона</string>
     <string name="no_ringtone_selected">Нет</string>
     <string name="day_end_before_start">The day cannot end earlier than it starts</string>
+    <string name="google_sync">Google sync</string>
 
     <plurals name="events_deleted">
         <item quantity="one">1 событие удалено</item>

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

@@ -73,6 +73,7 @@
     <string name="no_ringtone_picker">Hittade ingen app som kan ställa in ljudet</string>
     <string name="no_ringtone_selected">Ingen</string>
     <string name="day_end_before_start">Dagen kan inte börja innan den tar slut</string>
+    <string name="google_sync">Google sync</string>
 
     <plurals name="events_deleted">
         <item quantity="one">1 händelse borttagen</item>

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

@@ -73,6 +73,7 @@
     <string name="no_ringtone_picker">No app capable of setting ringtone found</string>
     <string name="no_ringtone_selected">None</string>
     <string name="day_end_before_start">The day cannot end earlier than it starts</string>
+    <string name="google_sync">Google sync</string>
 
     <plurals name="events_deleted">
         <item quantity="one">1 event deleted</item>