Implement Android 6-style permissions

* increase target API level to 23 (Android 6), which makes Android 6-style permissions mandatory
* AUTHENTICATE_ACCOUNTS permission is only required up to API level 22
* new activity: PermissionsActivity which shows missing permissions and provides buttons to request them
* DavService: Android shouldn't send a null Intent, but sometimes it does, so implement null check
* LocalTaskList: tasksProviderAvailable may return true on API level 23+ even if permissions are not sufficient
* SyncAdapterService: show a notification (with Intent for PermissionsActivity) when permissions are not sufficient
* when creating accounts, set OpenTasks sync always to true if API level is 23+ (even if OpenTasks is not installed [yet])
* update Lombok

app/build.gradle

@@ -15,7 +15,7 @@ android {
     defaultConfig {
         applicationId "at.bitfire.davdroid"
         minSdkVersion 14
-        targetSdkVersion 22
+        targetSdkVersion 23
 
         versionCode 96
         versionName "1.0.6"
@@ -60,7 +60,7 @@ configurations.all {
 }
 
 dependencies {
-    provided 'org.projectlombok:lombok:1.16.6'
+    provided 'org.projectlombok:lombok:1.16.8'
 
     compile project(':dav4android')
     compile project(':ical4android')

app/src/main/AndroidManifest.xml

@@ -21,6 +21,10 @@
     <uses-permission android:name="android.permission.WRITE_SYNC_SETTINGS"/>
 
     <!-- legacy permissions -->
+    <uses-permission
+        android:name="android.permission.AUTHENTICATE_ACCOUNTS"
+        android:maxSdkVersion="22"
+        tools:ignore="UnusedAttribute"/>
     <!--
          for writing external log files; permission only required for SDK <= 18 because since then,
          writing to app-private directory doesn't require extra permissions
@@ -35,7 +39,6 @@
         tools:ignore="UnusedAttribute"/>
 
     <!-- other permissions -->
-    <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS"/>
     <uses-permission android:name="android.permission.READ_CONTACTS"/>
     <!-- android.permission-group.CONTACTS -->
     <uses-permission android:name="android.permission.WRITE_CONTACTS"/>
@@ -137,7 +140,7 @@
                 <action android:name="android.accounts.LOGIN_ACCOUNTS_CHANGED"/>
             </intent-filter>
         </receiver>
-
+        
         <activity
             android:name=".ui.AccountsActivity"
             android:label="@string/app_name"
@@ -159,6 +162,10 @@
             android:label="@string/app_settings"
             android:parentActivityName=".ui.AccountsActivity"/>
 
+        <activity android:name=".ui.PermissionsActivity"
+                  android:label="@string/permissions_title"
+                  android:parentActivityName=".ui.AccountsActivity"/>
+
         <activity
             android:name=".ui.setup.LoginActivity"
             android:label="@string/login_title"

app/src/main/java/at/bitfire/davdroid/Constants.java

@@ -21,7 +21,8 @@ public class Constants {
             NOTIFICATION_REFRESH_COLLECTIONS = 2,
             NOTIFICATION_CONTACTS_SYNC = 10,
             NOTIFICATION_CALENDAR_SYNC = 11,
-            NOTIFICATION_TASK_SYNC = 12;
+            NOTIFICATION_TASK_SYNC = 12,
+            NOTIFICATION_PERMISSIONS = 20;
 
     public static final Uri webUri = Uri.parse("https://davdroid.bitfire.at/?pk_campaign=davdroid-app");
 

app/src/main/java/at/bitfire/davdroid/DavService.java

@@ -72,20 +72,22 @@ public class DavService extends Service {
 
     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
-        String action = intent.getAction();
-        long id = intent.getLongExtra(EXTRA_DAV_SERVICE_ID, -1);
-
-        switch (action) {
-            case ACTION_ACCOUNTS_UPDATED:
-                cleanupAccounts();
-                break;
-            case ACTION_REFRESH_COLLECTIONS:
-                if (runningRefresh.add(id)) {
-                    new Thread(new RefreshCollections(id)).start();
-                    for (RefreshingStatusListener listener : refreshingStatusListeners)
-                        listener.onDavRefreshStatusChanged(id, true);
-                }
-                break;
+        if (intent != null) {
+            String action = intent.getAction();
+            long id = intent.getLongExtra(EXTRA_DAV_SERVICE_ID, -1);
+
+            switch (action) {
+                case ACTION_ACCOUNTS_UPDATED:
+                    cleanupAccounts();
+                    break;
+                case ACTION_REFRESH_COLLECTIONS:
+                    if (runningRefresh.add(id)) {
+                        new Thread(new RefreshCollections(id)).start();
+                        for (RefreshingStatusListener listener : refreshingStatusListeners)
+                            listener.onDavRefreshStatusChanged(id, true);
+                    }
+                    break;
+            }
         }
 
         return START_NOT_STICKY;

app/src/main/java/at/bitfire/davdroid/resource/LocalTaskList.java

@@ -9,10 +9,11 @@
 package at.bitfire.davdroid.resource;
 
 import android.accounts.Account;
-import android.content.ContentResolver;
 import android.content.ContentValues;
+import android.content.Context;
 import android.database.Cursor;
 import android.net.Uri;
+import android.os.Build;
 import android.os.RemoteException;
 import android.support.annotation.NonNull;
 import android.text.TextUtils;
@@ -29,7 +30,6 @@ import at.bitfire.ical4android.AndroidTaskListFactory;
 import at.bitfire.ical4android.CalendarStorageException;
 import at.bitfire.ical4android.TaskProvider;
 import lombok.Cleanup;
-import okhttp3.HttpUrl;
 
 public class LocalTaskList extends AndroidTaskList implements LocalCollection {
 
@@ -134,12 +134,16 @@ public class LocalTaskList extends AndroidTaskList implements LocalCollection {
 
     // helpers
 
-    public static boolean tasksProviderAvailable(@NonNull ContentResolver resolver) {
+    public static boolean tasksProviderAvailable(@NonNull Context context) {
         if (tasksProviderAvailable != null)
             return tasksProviderAvailable;
         else {
-            @Cleanup TaskProvider provider = TaskProvider.acquire(resolver, TaskProvider.ProviderName.OpenTasks);
-            return tasksProviderAvailable = (provider != null);
+            if (Build.VERSION.SDK_INT >= 23)
+                return context.getPackageManager().resolveContentProvider(TaskProvider.ProviderName.OpenTasks.authority, 0) != null;
+            else {
+                @Cleanup TaskProvider provider = TaskProvider.acquire(context.getContentResolver(), TaskProvider.ProviderName.OpenTasks);
+                return tasksProviderAvailable = (provider != null);
+            }
         }
     }
 

app/src/main/java/at/bitfire/davdroid/syncadapter/SyncAdapterService.java

@@ -9,13 +9,16 @@
 package at.bitfire.davdroid.syncadapter;
 
 import android.accounts.Account;
+import android.app.Notification;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
 import android.app.Service;
 import android.content.AbstractThreadedSyncAdapter;
 import android.content.ContentProviderClient;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SyncResult;
-import android.database.sqlite.SQLiteDatabase;
+import android.graphics.drawable.BitmapDrawable;
 import android.net.ConnectivityManager;
 import android.net.NetworkInfo;
 import android.net.wifi.WifiInfo;
@@ -24,18 +27,15 @@ import android.os.Bundle;
 import android.os.IBinder;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
-import android.support.v4.net.ConnectivityManagerCompat;
-import android.text.TextUtils;
-
-import org.apache.commons.lang3.StringUtils;
-import org.apache.commons.lang3.text.WordUtils;
+import android.support.v4.app.NotificationCompat;
 
 import java.util.logging.Level;
 
 import at.bitfire.davdroid.AccountSettings;
 import at.bitfire.davdroid.App;
-import at.bitfire.davdroid.InvalidAccountException;
-import at.bitfire.davdroid.model.ServiceDB;
+import at.bitfire.davdroid.Constants;
+import at.bitfire.davdroid.R;
+import at.bitfire.davdroid.ui.PermissionsActivity;
 
 public abstract class SyncAdapterService extends Service {
 
@@ -62,6 +62,27 @@ public abstract class SyncAdapterService extends Service {
             Thread.currentThread().setContextClassLoader(getContext().getClassLoader());
         }
 
+        @Override
+        public void onSecurityException(Account account, Bundle extras, String authority, SyncResult syncResult) {
+            App.log.log(Level.WARNING, "Security exception when opening content provider for " +  authority);
+            syncResult.databaseError = true;
+
+            Intent intent = new Intent(getContext(), PermissionsActivity.class);
+            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+
+            Notification notify = new NotificationCompat.Builder(getContext())
+                    .setSmallIcon(R.drawable.ic_error_light)
+                    .setLargeIcon(((BitmapDrawable)getContext().getResources().getDrawable(R.drawable.ic_launcher)).getBitmap())
+                    .setContentTitle("DAVdroid permissions")
+                    .setContentText("Additional permissions are required.")
+                    .setContentIntent(PendingIntent.getActivity(getContext(), 0, intent, PendingIntent.FLAG_CANCEL_CURRENT))
+                    .setCategory(NotificationCompat.CATEGORY_ERROR)
+                    .setLocalOnly(true)
+                    .build();
+            NotificationManager nm = (NotificationManager)getContext().getSystemService(NOTIFICATION_SERVICE);
+            nm.notify(Constants.NOTIFICATION_PERMISSIONS, notify);
+        }
+
         protected boolean checkSyncConditions(@NonNull AccountSettings settings) {
             if (settings.getSyncWifiOnly()) {
                 ConnectivityManager cm = (ConnectivityManager)getContext().getSystemService(CONNECTIVITY_SERVICE);

app/src/main/java/at/bitfire/davdroid/syncadapter/SyncManager.java

@@ -15,6 +15,7 @@ import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SyncResult;
+import android.graphics.drawable.BitmapDrawable;
 import android.net.Uri;
 import android.os.Bundle;
 import android.support.v7.app.NotificationCompat;
@@ -223,7 +224,8 @@ abstract public class SyncManager {
             detailsIntent.setData(Uri.parse("uri://" + getClass().getName() + "/" + uniqueCollectionId));
 
             NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
-            builder .setSmallIcon(R.drawable.ic_launcher)
+            builder .setSmallIcon(R.drawable.ic_error_light)
+                    .setLargeIcon(((BitmapDrawable)context.getResources().getDrawable(R.drawable.ic_launcher)).getBitmap())
                     .setContentTitle(getSyncErrorTitle())
                     .setContentIntent(PendingIntent.getActivity(context, 0, detailsIntent, PendingIntent.FLAG_CANCEL_CURRENT))
                     .setCategory(NotificationCompat.CATEGORY_ERROR)

app/src/main/java/at/bitfire/davdroid/ui/PermissionsActivity.java

@@ -0,0 +1,95 @@
+/*
+ * Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Public License v3.0
+ * which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/gpl.html
+ */
+
+package at.bitfire.davdroid.ui;
+
+import android.Manifest;
+import android.app.NotificationManager;
+import android.content.pm.PackageManager;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.app.ActivityCompat;
+import android.support.v7.app.AppCompatActivity;
+import android.view.View;
+
+import at.bitfire.davdroid.Constants;
+import at.bitfire.davdroid.R;
+import at.bitfire.davdroid.resource.LocalTaskList;
+
+public class PermissionsActivity extends AppCompatActivity {
+
+    public static final String
+            PERMISSION_READ_TASKS = "org.dmfs.permission.READ_TASKS",
+            PERMISSION_WRITE_TASKS = "org.dmfs.permission.WRITE_TASKS";
+
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_permissions);
+
+        refresh();
+    }
+
+    protected void refresh() {
+        boolean noCalendarPermissions =
+                ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_CALENDAR) != PackageManager.PERMISSION_GRANTED ||
+                ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_CALENDAR) != PackageManager.PERMISSION_GRANTED;
+        findViewById(R.id.calendar_permissions).setVisibility(noCalendarPermissions ? View.VISIBLE : View.GONE);
+
+        boolean noContactsPermissions =
+                ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED ||
+                ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_CONTACTS) != PackageManager.PERMISSION_GRANTED;
+        findViewById(R.id.contacts_permissions).setVisibility(noContactsPermissions ? View.VISIBLE : View.GONE);
+
+        boolean noTaskPermissions;
+        if (LocalTaskList.tasksProviderAvailable(this)) {
+            noTaskPermissions =
+                    ActivityCompat.checkSelfPermission(this, PERMISSION_READ_TASKS) != PackageManager.PERMISSION_GRANTED ||
+                    ActivityCompat.checkSelfPermission(this, PERMISSION_WRITE_TASKS) != PackageManager.PERMISSION_GRANTED;
+            findViewById(R.id.opentasks_permissions).setVisibility(noTaskPermissions ? View.VISIBLE : View.GONE);
+        } else {
+            findViewById(R.id.opentasks_permissions).setVisibility(View.GONE);
+            noTaskPermissions = false;
+        }
+
+        if (!noCalendarPermissions && !noContactsPermissions && !noTaskPermissions) {
+            NotificationManager nm = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
+            nm.cancel(Constants.NOTIFICATION_PERMISSIONS);
+
+            finish();
+        }
+    }
+
+    public void requestCalendarPermissions(View v) {
+        ActivityCompat.requestPermissions(this, new String[] {
+                Manifest.permission.READ_CALENDAR,
+                Manifest.permission.WRITE_CALENDAR
+        }, 0);
+    }
+
+    public void requestContactsPermissions(View v) {
+        ActivityCompat.requestPermissions(this, new String[] {
+                Manifest.permission.READ_CONTACTS,
+                Manifest.permission.WRITE_CONTACTS
+        }, 0);
+    }
+
+    public void requestOpenTasksPermissions(View v) {
+        ActivityCompat.requestPermissions(this, new String[] {
+                PERMISSION_READ_TASKS,
+                PERMISSION_WRITE_TASKS
+        }, 0);
+    }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+        refresh();
+    }
+}

app/src/main/java/at/bitfire/davdroid/ui/StartupDialogFragment.java

@@ -70,7 +70,7 @@ public class StartupDialogFragment extends DialogFragment {
         }
 
         // OpenTasks information
-        if (!LocalTaskList.tasksProviderAvailable(context.getContentResolver()) &&
+        if (!LocalTaskList.tasksProviderAvailable(context) &&
                 settings.getBoolean(HINT_OPENTASKS_NOT_INSTALLED, true))
             dialogs.add(StartupDialogFragment.instantiate(Mode.OPENTASKS_NOT_INSTALLED));
 
@@ -177,7 +177,8 @@ public class StartupDialogFragment extends DialogFragment {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
                                 Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=org.dmfs.tasks"));
-                                getContext().startActivity(intent);
+                                if (intent.resolveActivity(getContext().getPackageManager()) != null)
+                                    getContext().startActivity(intent);
                             }
                         })
                         .setNegativeButton(R.string.startup_dont_show_again, new DialogInterface.OnClickListener() {

app/src/main/java/at/bitfire/davdroid/ui/setup/AccountDetailsFragment.java

@@ -14,6 +14,7 @@ import android.content.ContentResolver;
 import android.content.ContentValues;
 import android.content.Intent;
 import android.database.sqlite.SQLiteDatabase;
+import android.os.Build;
 import android.os.Bundle;
 import android.provider.CalendarContract;
 import android.provider.ContactsContract;
@@ -107,13 +108,13 @@ public class AccountDetailsFragment extends Fragment {
         App.log.log(Level.INFO, "Writing account configuration to database", config);
         @Cleanup OpenHelper dbHelper = new OpenHelper(getContext());
         SQLiteDatabase db = dbHelper.getWritableDatabase();
-        db.beginTransactionNonExclusive();
         try {
             AccountSettings settings = new AccountSettings(getContext(), account);
 
             Intent refreshIntent = new Intent(getActivity(), DavService.class);
             refreshIntent.setAction(DavService.ACTION_REFRESH_COLLECTIONS);
 
+            db.beginTransactionNonExclusive();
             if (config.cardDAV != null) {
                 long id = insertService(db, accountName, Services.SERVICE_CARDDAV, config.cardDAV);
                 refreshIntent.putExtra(DavService.EXTRA_DAV_SERVICE_ID, id);
@@ -132,13 +133,12 @@ public class AccountDetailsFragment extends Fragment {
                 ContentResolver.setIsSyncable(account, CalendarContract.AUTHORITY, 1);
                 settings.setSyncInterval(CalendarContract.AUTHORITY, DEFAULT_SYNC_INTERVAL);
 
-                if (LocalTaskList.tasksProviderAvailable(getContext().getContentResolver())) {
-                    // will only do something if OpenTasks is installed and accessible
+                if (Build.VERSION.SDK_INT >= 23 || LocalTaskList.tasksProviderAvailable(getContext())) {
                     ContentResolver.setIsSyncable(account, TaskProvider.ProviderName.OpenTasks.authority, 1);
                     settings.setSyncInterval(TaskProvider.ProviderName.OpenTasks.authority, DEFAULT_SYNC_INTERVAL);
                 } else
-                    // If OpenTasks is installed after DAVdroid, DAVdroid won't get task permissions and crash at every task sync
-                    // unless we disable task sync here (before OpenTasks is available).
+                    // Android <6 only: disable OpenTasks sync forever when OpenTasks is not installed
+                    // because otherwise, there will be a non-catchable SecurityException as soon as OpenTasks is installed
                     ContentResolver.setIsSyncable(account, TaskProvider.ProviderName.OpenTasks.authority, 0);
             } else {
                 ContentResolver.setIsSyncable(account, CalendarContract.AUTHORITY, 0);

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

@@ -0,0 +1,103 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
+  ~ All rights reserved. This program and the accompanying materials
+  ~ are made available under the terms of the GNU Public License v3.0
+  ~ which accompanies this distribution, and is available at
+  ~ http://www.gnu.org/licenses/gpl.html
+  -->
+
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+            xmlns:tools="http://schemas.android.com/tools"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:layout_margin="@dimen/activity_margin">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical">
+
+        <LinearLayout
+            android:id="@+id/calendar_permissions"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical"
+            android:layout_marginBottom="16dp"
+            tools:ignore="UselessParent">
+
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                style="@style/TextView.Heading"
+                android:text="@string/permissions_calendar"/>
+
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text="@string/permissions_calendar_details"/>
+
+            <Button
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/permissions_calendar_request"
+                android:onClick="requestCalendarPermissions"/>
+
+        </LinearLayout>
+
+        <LinearLayout
+            android:id="@+id/contacts_permissions"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical"
+            android:layout_marginBottom="16dp"
+            tools:ignore="UselessParent">
+
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                style="@style/TextView.Heading"
+                android:text="@string/permissions_contacts"/>
+
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text="@string/permissions_contacts_details"/>
+
+            <Button
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/permissions_contacts_request"
+                android:onClick="requestContactsPermissions"/>
+
+        </LinearLayout>
+
+        <LinearLayout
+            android:id="@+id/opentasks_permissions"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical"
+            tools:ignore="UselessParent">
+
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                style="@style/TextView.Heading"
+                android:text="@string/permissions_opentasks"/>
+
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text="@string/permissions_opentasks_details"/>
+
+            <Button
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/permissions_opentasks_request"
+                android:onClick="requestOpenTasksPermissions"/>
+
+        </LinearLayout>
+
+    </LinearLayout>
+
+</ScrollView>

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

@@ -94,6 +94,18 @@
     <string name="account_refresh_calendar_list">Refresh calendar list</string>
     <string name="account_create_new_calendar">Create new calendar</string>
 
+    <!-- PermissionsActivity -->
+    <string name="permissions_title">DAVdroid permissions</string>
+    <string name="permissions_calendar">Calendar permissions</string>
+    <string name="permissions_calendar_details">To synchronize CalDAV events with your local calendars, DAVdroid needs to access your calendars.</string>
+    <string name="permissions_calendar_request">Request calendar permissions</string>
+    <string name="permissions_contacts">Contacts permissions</string>
+    <string name="permissions_contacts_details">To synchronize CardDAV address books with your local contacts, DAVdroid needs to access your contacts.</string>
+    <string name="permissions_contacts_request">Request contacts permissions</string>
+    <string name="permissions_opentasks">OpenTasks permissions</string>
+    <string name="permissions_opentasks_details">To synchronize CalDAV tasks with your local task lists, DAVdroid needs to access OpenTasks.</string>
+    <string name="permissions_opentasks_request">Request OpenTasks permissions</string>
+
     <!-- AddAccountActivity -->
     <string name="login_title">Add account</string>
     <string name="login_type_email">Login with email address</string>
@@ -159,13 +171,6 @@
         <item>Every 4 hours</item>
         <item>Once a day</item>
     </string-array>
-    <string name="settings_sync_time_range_past">Past event time limit</string>
-    <string name="settings_sync_time_range_past_none">All events will be synchronized</string>
-    <plurals name="settings_sync_time_range_past_days">
-        <item quantity="one">Events more than one day in the past will be ignored</item>
-        <item quantity="other">Events more than %d days in the past will be ignored</item>
-    </plurals>
-    <string name="settings_sync_time_range_past_message">Events which are more than this number of days in the past will be ignored (may be 0). Leave blank to synchronize all events.</string>
     <string name="settings_sync_wifi_only">Sync over WiFi only</string>
     <string name="settings_sync_wifi_only_on">Synchronization is restricted to WiFi connections</string>
     <string name="settings_sync_wifi_only_off">Connection type is not taken into consideration</string>
@@ -173,6 +178,14 @@
     <string name="settings_sync_wifi_only_ssid_on">Will only synchronize over %s</string>
     <string name="settings_sync_wifi_only_ssid_off">All WiFi connections may be used</string>
     <string name="settings_sync_wifi_only_ssid_message">Enter the name of a WiFi network (SSID) to restrict synchronization to this network, or leave blank for all WiFi connections.</string>
+    <string name="settings_caldav">CalDAV</string>
+    <string name="settings_sync_time_range_past">Past event time limit</string>
+    <string name="settings_sync_time_range_past_none">All events will be synchronized</string>
+    <plurals name="settings_sync_time_range_past_days">
+        <item quantity="one">Events more than one day in the past will be ignored</item>
+        <item quantity="other">Events more than %d days in the past will be ignored</item>
+    </plurals>
+    <string name="settings_sync_time_range_past_message">Events which are more than this number of days in the past will be ignored (may be 0). Leave blank to synchronize all events.</string>
     <string name="settings_manage_calendar_colors">Manage calendar colors</string>
     <string name="settings_manage_calendar_colors_on">Calendar colors are managed by DAVdroid</string>
     <string name="settings_manage_calendar_colors_off">Calendar colors are not set by DAVdroid</string>

app/src/main/res/xml/settings_account.xml

@@ -74,7 +74,7 @@
 
     </PreferenceCategory>
 
-    <PreferenceCategory android:title="CalDAV">
+    <PreferenceCategory android:title="@string/settings_caldav">
 
         <EditTextPreference
             android:key="caldav_time_range_past_days"

build.gradle

@@ -12,7 +12,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.5.0+'
+        classpath 'com.android.tools.build:gradle:2.0.0+'
     }
 }
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Fri Oct 30 11:00:03 CET 2015
+#Sat Apr 09 22:18:11 CEST 2016
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.2.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-all.zip

ical4android

@@ -1 +1 @@
-Subproject commit 19ef2603edc7a28bce1b9ea1f7fa11ca89234dc0
+Subproject commit a9495e136733e44f3276f08c049def2584aac3a4

vcard4android

@@ -1 +1 @@
-Subproject commit 4eab186a210f7fdb74f17af2b086fc17ba2291c7
+Subproject commit 80b0f298076766df5844c5209a260423ebd1a8d3