Allow text to be shared to devices

app/src/main/AndroidManifest.xml

@@ -789,6 +789,18 @@
             </intent-filter>
         </activity>
 
+        <activity
+            android:name=".activities.TextReceiverActivity"
+            android:excludeFromRecents="true"
+            android:label="@string/text_receiver_activity_title"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.SEND" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:mimeType="text/plain" />
+            </intent-filter>
+        </activity>
+
         <activity
             android:name=".activities.WakeActivity"
             android:label="WakeActivity">

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/TextReceiverActivity.java

@@ -0,0 +1,80 @@
+/*  Copyright (C) 2023 José Rebelo
+
+    This file is part of Gadgetbridge.
+
+    Gadgetbridge is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Gadgetbridge is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
+package nodomain.freeyourgadget.gadgetbridge.activities;
+
+import android.content.Intent;
+import android.os.Bundle;
+
+import org.apache.commons.lang3.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import nodomain.freeyourgadget.gadgetbridge.BuildConfig;
+import nodomain.freeyourgadget.gadgetbridge.GBApplication;
+import nodomain.freeyourgadget.gadgetbridge.model.NotificationSpec;
+import nodomain.freeyourgadget.gadgetbridge.model.NotificationType;
+
+/**
+ * Receive any shared plaintext and forward it directly to the devices as a notification.
+ */
+public class TextReceiverActivity extends AbstractGBActivity {
+    private static final Logger LOG = LoggerFactory.getLogger(TextReceiverActivity.class);
+
+    @Override
+    protected void onCreate(final Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        final Intent intent = getIntent();
+
+        final String action = intent.getAction();
+        if (!Intent.ACTION_SEND.equals(action)) {
+            LOG.warn("Unknown action '{}'", action);
+            finish();
+            return;
+        }
+
+        final String type = intent.getType();
+        if (!"text/plain".equals(type)) {
+            LOG.warn("Unknown type '{}'", type);
+            finish();
+            return;
+        }
+
+        final String text = intent.getStringExtra(Intent.EXTRA_TEXT);
+        if (StringUtils.isBlank(text)) {
+            LOG.warn("Text is null or empty");
+            finish();
+            return;
+        }
+
+        LOG.info("Sending '{}' to all devices", text);
+
+        final NotificationSpec notificationSpec = new NotificationSpec();
+        final String appName = getApplicationContext().getApplicationInfo()
+                .loadLabel(getApplicationContext().getPackageManager())
+                .toString();
+        notificationSpec.title = appName;
+        notificationSpec.body = text;
+        notificationSpec.sourceAppId = BuildConfig.APPLICATION_ID;
+        notificationSpec.sourceName = appName;
+        notificationSpec.type = NotificationType.UNKNOWN;
+        notificationSpec.pebbleColor = notificationSpec.type.color;
+
+        GBApplication.deviceService().onNotification(notificationSpec);
+        finish();
+    }
+}

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

@@ -1575,6 +1575,7 @@
     <string name="about_version">Version %s</string>
     <string name="about_hash">Commit %s</string>
     <string name="gpx_receiver_activity_title">GPX Receiver Gadgetbridge</string>
+    <string name="text_receiver_activity_title">Send text to device</string>
     <string name="gpx_receiver_files_received">GPX file(s) received:</string>
     <string name="gpx_receiver_overwrite_some_files">Some file(s) already exist. Overwrite?</string>
     <string name="about_core_team_title">Core Team (in order of first code contribution)</string>