add basic foreground service and event receiver

app/src/main/AndroidManifest.xml

@@ -44,6 +44,7 @@
 
     <queries>
         <package android:name="org.torproject.android" />
+
         <intent>
             <action android:name="eu.siacs.conversations.location.request" />
         </intent>
@@ -63,30 +64,44 @@
     </queries>
 
 
-
-
     <application
         android:name="im.conversations.android.Conversations"
         android:allowBackup="true"
         android:appCategory="social"
-        android:icon="@mipmap/new_launcher"
-        android:roundIcon="@mipmap/new_launcher_round"
         android:dataExtractionRules="@xml/data_extraction_rules"
         android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/new_launcher"
         android:label="@string/app_name"
+        android:roundIcon="@mipmap/new_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.Conversations3"
         tools:targetApi="31">
 
+        <service
+            android:name=".service.ForegroundService"
+            android:exported="false" />
+
+        <receiver
+            android:name=".receiver.EventReceiver"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+                <action android:name="android.intent.action.ACTION_SHUTDOWN" />
+                <action android:name="android.media.RINGER_MODE_CHANGED" />
+            </intent-filter>
+        </receiver>
+
         <activity
-            android:name="im.conversations.android.ui.activity.SetupActivity"
+            android:name="im.conversations.android.ui.activity.MainActivity"
-            android:exported="true"
+            android:exported="true">
-            android:windowSoftInputMode="adjustResize">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <activity
+            android:name="im.conversations.android.ui.activity.SetupActivity"
+            android:windowSoftInputMode="adjustResize" />
     </application>
 
 </manifest>

app/src/main/java/im/conversations/android/Conversations.java

@@ -4,6 +4,7 @@ import android.app.Application;
 import androidx.appcompat.app.AppCompatDelegate;
 import com.google.android.material.color.DynamicColors;
 import im.conversations.android.dns.Resolver;
+import im.conversations.android.notification.Channels;
 import im.conversations.android.xmpp.ConnectionPool;
 import java.security.SecureRandom;
 import java.security.Security;
@@ -25,6 +26,8 @@ public class Conversations extends Application {
         } catch (final Throwable throwable) {
             LOGGER.warn("Could not initialize security provider", throwable);
         }
+        final var channels = new Channels(this);
+        channels.initialize();
         Resolver.init(this);
         ConnectionPool.getInstance(this).reconfigure();
         AppCompatDelegate.setDefaultNightMode(

app/src/main/java/im/conversations/android/notification/Channels.java

@@ -0,0 +1,58 @@
+package im.conversations.android.notification;
+
+import android.app.Application;
+import android.app.NotificationChannel;
+import android.app.NotificationChannelGroup;
+import android.app.NotificationManager;
+import android.os.Build;
+import androidx.annotation.RequiresApi;
+import androidx.core.content.ContextCompat;
+import im.conversations.android.R;
+
+public final class Channels {
+
+    private final Application application;
+
+    private static final String CHANNEL_GROUP_STATUS = "status";
+    static final String CHANNEL_FOREGROUND = "foreground";
+
+    public Channels(final Application application) {
+        this.application = application;
+    }
+
+    public void initialize() {
+        final var notificationManager =
+                ContextCompat.getSystemService(application, NotificationManager.class);
+        if (notificationManager == null) {
+            return;
+        }
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            this.initializeGroups(notificationManager);
+            this.initializeForegroundChannel(notificationManager);
+        }
+    }
+
+    @RequiresApi(api = Build.VERSION_CODES.O)
+    private void initializeGroups(NotificationManager notificationManager) {
+        notificationManager.createNotificationChannelGroup(
+                new NotificationChannelGroup(
+                        CHANNEL_GROUP_STATUS,
+                        application.getString(R.string.notification_group_status_information)));
+    }
+
+    @RequiresApi(api = Build.VERSION_CODES.O)
+    private void initializeForegroundChannel(final NotificationManager notificationManager) {
+        final NotificationChannel foregroundServiceChannel =
+                new NotificationChannel(
+                        CHANNEL_FOREGROUND,
+                        application.getString(R.string.foreground_service_channel_name),
+                        NotificationManager.IMPORTANCE_MIN);
+        foregroundServiceChannel.setDescription(
+                application.getString(
+                        R.string.foreground_service_channel_description,
+                        application.getString(R.string.app_name)));
+        foregroundServiceChannel.setShowBadge(false);
+        foregroundServiceChannel.setGroup(CHANNEL_GROUP_STATUS);
+        notificationManager.createNotificationChannel(foregroundServiceChannel);
+    }
+}

app/src/main/java/im/conversations/android/notification/ForegroundServiceNotification.java

@@ -0,0 +1,63 @@
+package im.conversations.android.notification;
+
+import android.app.Notification;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.app.Service;
+import android.content.Intent;
+import android.os.Build;
+
+import androidx.core.content.ContextCompat;
+
+import im.conversations.android.R;
+import im.conversations.android.ui.activity.MainActivity;
+import im.conversations.android.xmpp.ConnectionPool;
+
+public class ForegroundServiceNotification {
+
+    public static final int ID = 1;
+
+    private final Service service;
+
+    public ForegroundServiceNotification(final Service service) {
+        this.service = service;
+    }
+
+    public Notification build(final ConnectionPool.Summary summary) {
+        final Notification.Builder builder = new Notification.Builder(service);
+        builder.setContentTitle(service.getString(R.string.app_name));
+        builder.setContentText(
+                service.getString(R.string.connected_accounts, summary.connected, summary.total));
+        builder.setContentIntent(buildPendingIntent());
+        builder.setWhen(0)
+                .setPriority(Notification.PRIORITY_MIN)
+                .setSmallIcon(
+                        summary.isConnected()
+                                ? R.drawable.ic_link_24dp
+                                : R.drawable.ic_link_off_24dp)
+                .setLocalOnly(true);
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            builder.setChannelId(Channels.CHANNEL_FOREGROUND);
+        }
+
+        return builder.build();
+    }
+
+    private PendingIntent buildPendingIntent() {
+        return PendingIntent.getActivity(
+                service,
+                0,
+                new Intent(service, MainActivity.class),
+                PendingIntent.FLAG_IMMUTABLE | PendingIntent.FLAG_UPDATE_CURRENT);
+    }
+
+    public void update(final ConnectionPool.Summary summary) {
+        final var notificationManager = ContextCompat.getSystemService(service, NotificationManager.class);
+        if (notificationManager == null) {
+            return;
+        }
+        final var notification = build(summary);
+        notificationManager.notify(ID, notification);
+    }
+}

app/src/main/java/im/conversations/android/receiver/EventReceiver.java

@@ -0,0 +1,20 @@
+package im.conversations.android.receiver;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import androidx.core.content.ContextCompat;
+import im.conversations.android.service.ForegroundService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class EventReceiver extends BroadcastReceiver {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(EventReceiver.class);
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        LOGGER.info("Received event {}", intent.getAction());
+        ForegroundService.start(context);
+    }
+}

app/src/main/java/im/conversations/android/service/ForegroundService.java

@@ -0,0 +1,49 @@
+package im.conversations.android.service;
+
+import android.content.Context;
+import android.content.Intent;
+
+import androidx.core.content.ContextCompat;
+import androidx.lifecycle.LifecycleService;
+import im.conversations.android.notification.ForegroundServiceNotification;
+import im.conversations.android.xmpp.ConnectionPool;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ForegroundService extends LifecycleService {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(ForegroundService.class);
+
+    private final ForegroundServiceNotification foregroundServiceNotification =
+            new ForegroundServiceNotification(this);
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        LOGGER.info("Creating service");
+        final var pool = ConnectionPool.getInstance(this);
+        startForeground(
+                ForegroundServiceNotification.ID,
+                foregroundServiceNotification.build(pool.buildSummary()));
+        pool.setSummaryProcessor(this::onSummaryUpdated);
+    }
+
+    private void onSummaryUpdated(final ConnectionPool.Summary summary) {
+        foregroundServiceNotification.update(summary);
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        LOGGER.debug("Destroying service. Removing listeners");
+        ConnectionPool.getInstance(this).setSummaryProcessor(null);
+    }
+
+    public static void start(final Context context) {
+        try {
+            ContextCompat.startForegroundService(context, new Intent(context, ForegroundService.class));
+        } catch (final RuntimeException e) {
+            LOGGER.error("Could not start foreground service", e);
+        }
+    }
+}

app/src/main/java/im/conversations/android/ui/activity/MainActivity.java

@@ -0,0 +1,15 @@
+package im.conversations.android.ui.activity;
+
+import android.os.Bundle;
+import androidx.appcompat.app.AppCompatActivity;
+
+import im.conversations.android.service.ForegroundService;
+
+public class MainActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(final Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        ForegroundService.start(this);
+    }
+}

app/src/main/java/im/conversations/android/xmpp/ConnectionPool.java

@@ -3,6 +3,7 @@ package im.conversations.android.xmpp;
 import android.content.Context;
 import android.os.SystemClock;
 import com.google.common.base.Optional;
+import com.google.common.collect.Collections2;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
@@ -21,6 +22,7 @@ import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
+import java.util.function.Consumer;
 import org.jxmpp.jid.BareJid;
 import org.jxmpp.jid.Jid;
 import org.slf4j.Logger;
@@ -48,6 +50,8 @@ public class ConnectionPool {
     private final List<XmppConnection> connections = new ArrayList<>();
     private final HashSet<Jid> lowPingTimeoutMode = new HashSet<>();
 
+    private Consumer<Summary> summaryProcessor;
+
     private ConnectionPool(final Context context) {
         this.context = context.getApplicationContext();
     }
@@ -207,10 +211,30 @@ public class ConnectionPool {
                 }
             }
         }
+        this.updateSummaryProcessor();
         // TODO toggle error notification
         // getNotificationService().updateErrorNotification();
     }
 
+    private void updateSummaryProcessor() {
+        final var processor = this.summaryProcessor;
+        if (processor == null) {
+            return;
+        }
+        processor.accept(buildSummary());
+    }
+
+    public synchronized Summary buildSummary() {
+        final int connected =
+                Collections2.filter(this.connections, c -> c.getStatus() == ConnectionState.ONLINE)
+                        .size();
+        return new Summary(this.connections.size(), connected);
+    }
+
+    public void setSummaryProcessor(final Consumer<Summary> processor) {
+        this.summaryProcessor = processor;
+    }
+
     public void scheduleWakeUpCall(final int seconds) {
         CONNECTION_SCHEDULER.schedule(
                 () -> {
@@ -372,6 +396,20 @@ public class ConnectionPool {
         return ImmutableSet.copyOf(Lists.transform(this.connections, XmppConnection::getAccount));
     }
 
+    public static final class Summary {
+        public final int total;
+        public final int connected;
+
+        public Summary(int total, int connected) {
+            this.total = total;
+            this.connected = connected;
+        }
+
+        public boolean isConnected() {
+            return total > 0 && total == connected;
+        }
+    }
+
     public static ConnectionPool getInstance(final Context context) {
         if (INSTANCE != null) {
             return INSTANCE;

app/src/main/res/drawable/ic_link_24dp.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?attr/colorControlNormal"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M3.9,12c0,-1.71 1.39,-3.1 3.1,-3.1h4L11,7L7,7c-2.76,0 -5,2.24 -5,5s2.24,5 5,5h4v-1.9L7,15.1c-1.71,0 -3.1,-1.39 -3.1,-3.1zM8,13h8v-2L8,11v2zM17,7h-4v1.9h4c1.71,0 3.1,1.39 3.1,3.1s-1.39,3.1 -3.1,3.1h-4L13,17h4c2.76,0 5,-2.24 5,-5s-2.24,-5 -5,-5z" />
+</vector>

app/src/main/res/drawable/ic_link_off_24dp.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?attr/colorControlNormal"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M17,7h-4v1.9h4c1.71,0 3.1,1.39 3.1,3.1 0,1.43 -0.98,2.63 -2.31,2.98l1.46,1.46C20.88,15.61 22,13.95 22,12c0,-2.76 -2.24,-5 -5,-5zM16,11h-2.19l2,2L16,13zM2,4.27l3.11,3.11C3.29,8.12 2,9.91 2,12c0,2.76 2.24,5 5,5h4v-1.9L7,15.1c-1.71,0 -3.1,-1.39 -3.1,-3.1 0,-1.59 1.21,-2.9 2.76,-3.07L8.73,11L8,11v2h2.73L13,15.27L13,17h1.73l4.01,4L20,19.74 3.27,3 2,4.27z" />
+</vector>