Periodic sync, reload from memory if outdated

app/build.gradle

@@ -27,6 +27,7 @@ android {
 
 
 dependencies {
+    //implementation "com.android.support:support-compat:28.0.0"
     implementation 'androidx.recyclerview:recyclerview:1.0.0'
     implementation fileTree(include: ['*.jar'], dir: 'libs')
     androidTestImplementation('androidx.test.espresso:espresso-core:3.1.0-beta02', {
@@ -34,7 +35,7 @@ dependencies {
     })
     implementation 'androidx.preference:preference:1.0.0'
     implementation 'com.google.android.material:material:1.0.0'
-    implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha2'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha3'
     implementation 'com.android.volley:volley:1.1.0'
     //noinspection GradleDependency
     implementation 'com.google.android.gms:play-services-auth:15.0.0'

app/src/main/java/de/sebse/fuplanner/MainActivity.java

@@ -1,5 +1,6 @@
 package de.sebse.fuplanner;
 
+import android.accounts.Account;
 import android.accounts.AccountManager;
 import android.content.ContentResolver;
 import android.content.Intent;
@@ -48,6 +49,7 @@ import de.sebse.fuplanner.services.kvv.types.LoginToken;
 import de.sebse.fuplanner.services.kvv.types.Modules;
 import de.sebse.fuplanner.services.news.NewsManager;
 import de.sebse.fuplanner.tools.CustomAccountManager;
+import de.sebse.fuplanner.tools.CustomNotificationManager;
 import de.sebse.fuplanner.tools.MainActivityListener;
 import de.sebse.fuplanner.tools.NewAsyncQueue;
 import de.sebse.fuplanner.tools.Preferences;
@@ -138,12 +140,12 @@ public class MainActivity extends AppCompatActivity
                     changeFragment(getDefaultFragmentAfterLogout());
             });
         }
-        ContentResolver.addPeriodicSync(
-                mAccountManager.getAccountByType(AccountGeneral.ACCOUNT_TYPE),
-                KVVContentProvider.PROVIDER_NAME,
-                Bundle.EMPTY,
-                AccountGeneral.SYNC_INTERVAL);
 
+        if (!Preferences.getBoolean(this, R.string.pref_set_auto_sync_on_startup)) {
+            registerSync();
+            Preferences.setBoolean(this, R.string.pref_set_auto_sync_on_startup, true);
+        }
+        CustomNotificationManager.createNotificationChannel(this);
     }
 
     @Override
@@ -169,6 +171,8 @@ public class MainActivity extends AppCompatActivity
             getKVV().modules().list().reloadIfOutdated();
         }
         isPaused = false;
+        //log.d("onResume", "send notification!");
+        //CustomNotificationManager.sendNotification(this, "Titel", "Neue Announcements!");
     }
 
     @Override
@@ -357,6 +361,20 @@ public class MainActivity extends AppCompatActivity
         ((TextView) header.findViewById(R.id.login_mail)).setText(email);
 
         changeFragment(newFragment);
+        registerSync();
+    }
+
+    private void registerSync() {
+        Account accountByType = mAccountManager.getAccountByType(AccountGeneral.ACCOUNT_TYPE);
+        log.d("registerSync", accountByType);
+        if (accountByType != null) {
+            ContentResolver.setSyncAutomatically(accountByType, KVVContentProvider.PROVIDER_NAME, true);
+            ContentResolver.addPeriodicSync(
+                accountByType,
+                KVVContentProvider.PROVIDER_NAME,
+                Bundle.EMPTY,
+                AccountGeneral.SYNC_INTERVAL);
+        }
     }
 
     private void changeFragment(int newFragment) {

app/src/main/java/de/sebse/fuplanner/services/kvv/sync/KVVSyncAdapter.java

@@ -17,11 +17,13 @@ import de.sebse.fuplanner.services.kvv.KVVListener;
 import de.sebse.fuplanner.services.kvv.types.LoginToken;
 import de.sebse.fuplanner.services.kvv.types.Modules;
 import de.sebse.fuplanner.tools.CustomAccountManager;
+import de.sebse.fuplanner.tools.NewAsyncQueue;
 import de.sebse.fuplanner.tools.logging.Logger;
 
 public class KVVSyncAdapter extends AbstractThreadedSyncAdapter {
     private KVV mKVV;
     private Logger log = new Logger(this);
+    private NewAsyncQueue mQueue = new NewAsyncQueue();
 
     /**
      * Set up the sync adapter
@@ -53,7 +55,12 @@ public class KVVSyncAdapter extends AbstractThreadedSyncAdapter {
                 return accountManager;
             }
         }, context);
-        mKVV.account().restoreOnlineLogin(bool -> {});
+        mQueue.add(() -> {
+            mKVV.account().restoreOnlineLogin(bool -> {
+                log.d("login restored");
+                mQueue.next();
+            });
+        });
     }
 
     /*
@@ -68,20 +75,29 @@ public class KVVSyncAdapter extends AbstractThreadedSyncAdapter {
             String authority,
             ContentProviderClient provider,
             SyncResult syncResult) {
+        log.d("onPerformSync");
+        mQueue.add(() -> {
             log.d("start syncing");
-        /*
-         * Put the data transfer code here.
-         */
             mKVV.modules().list().recv(success -> {
                 Iterator<Modules.Module> iterator = success.latestSemesterIterator();
                 while (iterator.hasNext()) {
                     Modules.Module module = iterator.next();
                     log.d("sync module", module.title);
                     mKVV.modules().details().recv(module, success1 -> {
-                    if (success1.second)
+                        if (success1.second) {
                             log.d("Sync Successful for Module '"+module.title+"'!");
-                }, log::e, true);
+                            mQueue.next();
                         }
-        }, log::e, true);
+                    }, msg -> {
+                        log.e(msg);
+                        mQueue.next();
+                    }, true);
+                }
+            }, msg -> {
+                log.e(msg);
+                mQueue.next();
+            }, true);
+            log.d("finished");
+        });
     }
 }

app/src/main/java/de/sebse/fuplanner/tools/CustomNotificationManager.java

@@ -0,0 +1,57 @@
+package de.sebse.fuplanner.tools;
+
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Build;
+
+import org.jetbrains.annotations.NotNull;
+
+import androidx.core.app.NotificationCompat;
+import androidx.core.app.NotificationManagerCompat;
+import de.sebse.fuplanner.MainActivity;
+import de.sebse.fuplanner.R;
+
+public class CustomNotificationManager {
+    private static final String CHANNEL_ID = "fuplanner-default";
+    //public static ArrayList<Integer> passedNotifications = new ArrayList<>();
+
+    public static void sendNotification(Context context, String textTitle, String textContent) {
+        Intent intent = new Intent(context, MainActivity.class);
+        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
+        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
+
+
+        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context, CHANNEL_ID)
+                .setSmallIcon(R.drawable.ic_notification)
+                .setContentTitle(textTitle)
+                .setContentText(textContent)
+                .setPriority(NotificationCompat.PRIORITY_DEFAULT)
+                .setContentIntent(pendingIntent)
+                .setAutoCancel(true);
+
+        NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
+        int notificationId = (int) (System.currentTimeMillis() % Integer.MAX_VALUE);
+        notificationManager.notify(notificationId, mBuilder.build());
+    }
+
+    public static void createNotificationChannel(@NotNull Context context) {
+        // Create the NotificationChannel, but only on API 26+ because
+        // the NotificationChannel class is new and not in the support library
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            CharSequence name = context.getString(R.string.channel_name);
+            String description = context.getString(R.string.channel_description);
+            int importance = NotificationManager.IMPORTANCE_DEFAULT;
+            NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
+            channel.setDescription(description);
+            // Register the channel with the system; you can't change the importance
+            // or other notification behaviors after this
+            NotificationManager notificationManager = context.getSystemService(NotificationManager.class);
+            if (notificationManager != null) {
+                notificationManager.createNotificationChannel(channel);
+            }
+        }
+    }
+}

app/src/main/java/de/sebse/fuplanner/tools/Preferences.java

@@ -1,6 +1,7 @@
 package de.sebse.fuplanner.tools;
 
 import android.content.Context;
+
 import androidx.annotation.ArrayRes;
 import androidx.annotation.StringRes;
 import androidx.preference.PreferenceManager;
@@ -20,4 +21,14 @@ public class Preferences {
         String string = context.getResources().getString(key);
         PreferenceManager.getDefaultSharedPreferences(context).edit().putLong(string, value).apply();
     }
+
+    public static boolean getBoolean(Context context, @StringRes int key) {
+        String string = context.getResources().getString(key);
+        return PreferenceManager.getDefaultSharedPreferences(context).getBoolean(string, false);
+    }
+
+    public static void setBoolean(Context context, @StringRes int key, boolean value) {
+        String string = context.getResources().getString(key);
+        PreferenceManager.getDefaultSharedPreferences(context).edit().putBoolean(string, value).apply();
+    }
 }

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

@@ -92,4 +92,5 @@
     <string name="error_incorrect_password">Das Passwort ist nicht korrekt.</string>
     <string name="error_field_required">Pflichtfeld</string>
     <string name="kvv_sync">KVV-Synchronisation</string>
+    <string name="channel_name">Neue Daten verfügbar</string>
 </resources>

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

@@ -8,4 +8,6 @@
     <string name="pref_price_group_default" translatable="false">all</string>
 
     <string name="pref_last_visited_news" translatable="false">pref_last_visited_news</string>
+
+    <string name="pref_set_auto_sync_on_startup" translatable="false">pref_set_auto_sync_on_startup</string>
 </resources>

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

@@ -100,4 +100,6 @@
     <string name="error_incorrect_password">This password is incorrect</string>
     <string name="error_field_required">This field is required</string>
     <string name="kvv_sync">KVV Synchronization</string>
+    <string name="channel_name">New data available</string>
+    <string name="channel_description">Notify when new announcements, assignments, grades or resources are available</string>
 </resources>