Add Android Backup Service settings

* Add option to disable upload to backup service
* Display date of last upload

app/src/main/AndroidManifest.xml

@@ -123,6 +123,7 @@
   <application
     android:allowBackup="true"
     android:backupAgent="org.tasks.backup.TasksBackupAgent"
+    android:backupInForeground="true"
     android:networkSecurityConfig="@xml/network_security_config"
     android:icon="@mipmap/ic_launcher_blue"
     android:label="@string/app_name"

app/src/main/java/org/tasks/backup/TasksBackupAgent.kt

@@ -2,15 +2,19 @@ package org.tasks.backup
 
 import android.app.backup.BackupAgentHelper
 import android.app.backup.BackupDataInput
+import android.app.backup.BackupDataOutput
 import android.app.backup.FileBackupHelper
 import android.net.Uri
 import android.os.ParcelFileDescriptor
+import com.todoroo.andlib.utility.DateUtilities.now
 import com.todoroo.astrid.backup.BackupConstants
 import dagger.hilt.EntryPoint
 import dagger.hilt.InstallIn
 import dagger.hilt.android.EntryPointAccessors
 import dagger.hilt.android.components.ApplicationComponent
 import kotlinx.coroutines.runBlocking
+import org.tasks.R
+import org.tasks.preferences.Preferences
 import timber.log.Timber
 import java.io.File
 import java.io.IOException
@@ -20,14 +24,25 @@ class TasksBackupAgent : BackupAgentHelper() {
     @InstallIn(ApplicationComponent::class)
     internal interface TasksBackupAgentEntryPoint {
         val tasksJsonImporter: TasksJsonImporter
+        val preferences: Preferences
     }
 
     private lateinit var importer: TasksJsonImporter
+    private lateinit var preferences: Preferences
+
+    private val enabled: Boolean
+        get() = preferences.getBoolean(R.string.p_backups_android_backup_enabled, true)
 
     override fun onCreate() {
-        val hilt = EntryPointAccessors.fromApplication(applicationContext, TasksBackupAgentEntryPoint::class.java)
-        importer = hilt.tasksJsonImporter
-        addHelper(BACKUP_KEY, FileBackupHelper(this, BackupConstants.INTERNAL_BACKUP))
+        EntryPointAccessors
+                .fromApplication(applicationContext, TasksBackupAgentEntryPoint::class.java)
+                .let {
+                    importer = it.tasksJsonImporter
+                    preferences = it.preferences
+                }
+        if (enabled) {
+            addHelper(BACKUP_KEY, FileBackupHelper(this, BackupConstants.INTERNAL_BACKUP))
+        }
     }
 
     @Throws(IOException::class)
@@ -44,6 +59,14 @@ class TasksBackupAgent : BackupAgentHelper() {
         }
     }
 
+    override fun onBackup(oldState: ParcelFileDescriptor?, data: BackupDataOutput?, newState: ParcelFileDescriptor?) {
+        super.onBackup(oldState, data, newState)
+
+        if (enabled) {
+            preferences.setLong(R.string.p_backups_android_backup_last, now())
+        }
+    }
+
     override fun onQuotaExceeded(backupDataBytes: Long, quotaBytes: Long) {
         Timber.e("onQuotaExceeded(%s, %s)", backupDataBytes, quotaBytes)
     }

app/src/main/java/org/tasks/backup/TasksJsonImporter.kt

@@ -258,6 +258,7 @@ class TasksJsonImporter @Inject constructor(
     companion object {
         private val ignorePrefs = intArrayOf(
                 R.string.p_current_version,
+                R.string.p_backups_android_backup_last
         )
     }
 }

app/src/main/java/org/tasks/preferences/fragments/Backups.kt

@@ -6,7 +6,7 @@ import android.os.Bundle
 import androidx.preference.Preference
 import androidx.preference.SwitchPreferenceCompat
 import com.google.api.services.drive.DriveScopes
-import com.todoroo.astrid.gtasks.auth.GtasksLoginActivity
+import com.todoroo.andlib.utility.DateUtilities
 import dagger.hilt.android.AndroidEntryPoint
 import org.tasks.PermissionUtil
 import org.tasks.R
@@ -20,6 +20,7 @@ import org.tasks.preferences.FragmentPermissionRequestor
 import org.tasks.preferences.PermissionRequestor
 import org.tasks.preferences.Preferences
 import org.tasks.ui.Toaster
+import java.util.*
 import javax.inject.Inject
 
 private const val REQUEST_CODE_BACKUP_DIR = 10001
@@ -35,6 +36,7 @@ class Backups : InjectingPreferenceFragment() {
     @Inject lateinit var permissionRequestor: FragmentPermissionRequestor
     @Inject lateinit var toaster: Toaster
     @Inject lateinit var googleAccountManager: GoogleAccountManager
+    @Inject lateinit var locale: Locale
 
     override fun getPreferenceXml() = R.xml.preferences_backups
 
@@ -62,6 +64,17 @@ class Backups : InjectingPreferenceFragment() {
         super.onResume()
 
         updateGoogleDriveCheckbox()
+
+        val lastBackup = preferences.getLong(R.string.p_backups_android_backup_last, 0L)
+        findPreference(R.string.p_backups_android_backup_enabled).summary =
+                getString(
+                        R.string.last_backup,
+                        if (lastBackup == 0L) {
+                            getString(R.string.last_backup_never)
+                        } else {
+                            DateUtilities.getLongDateStringWithTime(lastBackup, locale)
+                        }
+                )
     }
 
     override fun onRequestPermissionsResult(

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

@@ -373,6 +373,8 @@
   <string name="p_show_whats_new">show_whats_new</string>
   <string name="p_just_updated">just_updated</string>
   <string name="p_clicked_rate">clicked_rate</string>
+  <string name="p_backups_android_backup_enabled">backups_android_backup_enabled</string>
+  <string name="p_backups_android_backup_last">backups_android_backup_last</string>
   <string name="p_current_version">cv</string>
 
   <string name="event_whats_new">whats_new</string>

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

@@ -637,4 +637,9 @@ File %1$s contained %2$s.\n\n
   <string name="reset_sort_order">Reset sort order</string>
   <string name="permission_read_tasks">Full access to Tasks database</string>
   <string name="account_not_found">Account not found</string>
+  <string name="android_auto_backup">Android Backup Service</string>
+  <string name="android_auto_backup_device_summary">You must also opt in to backup service through your device settings. Not all devices provide backup service.</string>
+  <string name="last_backup">Last backup: %s</string>
+  <string name="last_backup_never">never</string>
+  <string name="device_settings">Device settings</string>
 </resources>

app/src/main/res/xml/preferences_backups.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:app="http://schemas.android.com/apk/res-auto">
 
   <Preference
     android:key="@string/p_backup_dir"
@@ -17,4 +18,21 @@
     android:key="@string/backup_BAc_export"
     android:title="@string/backup_BAc_export" />
 
+  <PreferenceCategory
+    android:title="@string/android_auto_backup">
+
+    <SwitchPreferenceCompat
+      android:defaultValue="true"
+      android:key="@string/p_backups_android_backup_enabled"
+      android:title="@string/enabled" />
+
+    <Preference
+      android:title="@string/device_settings"
+      android:summary="@string/android_auto_backup_device_summary"
+      app:icon="@drawable/ic_open_in_new_24px">
+      <intent android:action="android.settings.SETTINGS" />
+    </Preference>
+
+  </PreferenceCategory>
+
 </PreferenceScreen>