Added option "ring"

src/app/src/main/AndroidManifest.xml

@@ -23,7 +23,13 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.LocateMyDevice"
         tools:targetApi="30">
-
+        <activity
+            android:name=".RingerActivity"
+            android:exported="false">
+            <meta-data
+                android:name="android.app.lib_name"
+                android:value="" />
+        </activity>
         <activity
             android:name=".ShowMessageActivity"
             android:exported="false"
@@ -31,8 +37,7 @@
             <meta-data
                 android:name="android.app.lib_name"
                 android:value="" />
-        </activity>
+        </activity> <!-- https://developer.android.com/guide/topics/manifest/receiver-element -->
-        <!-- https://developer.android.com/guide/topics/manifest/receiver-element -->
         <receiver
             android:name=".SmsReceiver"
             android:directBootAware="true"

src/app/src/main/java/com/xfarrow/locatemydevice/RingerActivity.java

@@ -0,0 +1,70 @@
+package com.xfarrow.locatemydevice;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.annotation.SuppressLint;
+import android.media.Ringtone;
+import android.media.RingtoneManager;
+import android.net.Uri;
+import android.os.Build;
+import android.os.Bundle;
+import android.view.View;
+import android.view.WindowManager;
+import android.widget.Button;
+
+public class RingerActivity extends AppCompatActivity {
+
+    private Ringtone ringtoneManager;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_ringer);
+        showOnLockscreen();
+        setViews();
+        startRinging();
+    }
+
+    // https://stackoverflow.com/questions/35356848/android-how-to-launch-activity-over-lock-screen
+    @SuppressLint("ObsoleteSdkInt")
+    private void showOnLockscreen(){
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1)
+        {
+            setShowWhenLocked(true);
+            setTurnScreenOn(true);
+        }
+        else
+        {
+            getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED |
+                    WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
+        }
+    }
+
+    private void setViews(){
+        Button stopButton = findViewById(R.id.stopButton);
+
+        stopButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                stopRinging();
+            }
+        });
+    }
+
+    private void startRinging(){
+        Uri ringtone = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
+        ringtoneManager = RingtoneManager.getRingtone(this, ringtone);
+        ringtoneManager.setVolume(1f);
+        ringtoneManager.play();
+    }
+
+    private void stopRinging(){
+        ringtoneManager.stop();
+        finishAffinity();
+    }
+
+    @Override
+    public void onBackPressed(){
+        stopRinging();
+    }
+}

src/app/src/main/java/com/xfarrow/locatemydevice/ShowMessageActivity.java

@@ -1,5 +1,6 @@
 package com.xfarrow.locatemydevice;
 
+import android.annotation.SuppressLint;
 import android.os.Build;
 import android.os.Bundle;
 import androidx.appcompat.app.AppCompatActivity;
@@ -21,6 +22,7 @@ public class ShowMessageActivity extends AppCompatActivity {
     }
 
     // https://stackoverflow.com/questions/35356848/android-how-to-launch-activity-over-lock-screen
+    @SuppressLint("ObsoleteSdkInt")
     private void showOnLockscreen(){
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1)
         {

src/app/src/main/java/com/xfarrow/locatemydevice/SmsHandler.java

@@ -14,6 +14,8 @@ import android.location.Criteria;
 import android.location.Location;
 import android.location.LocationListener;
 import android.location.LocationManager;
+import android.media.Ringtone;
+import android.media.RingtoneManager;
 import android.net.Uri;
 import android.net.wifi.ScanResult;
 import android.net.wifi.WifiInfo;
@@ -65,7 +67,9 @@ public class SmsHandler {
                 + "|"
                 + Utils.LOCK_OPTION
                 + "|"
-                + Utils.SHOW_MESSAGE_OPTION + "\\s+\"[\\w\\W]*[\"]$";
+                + Utils.SHOW_MESSAGE_OPTION + "\\s+\"[\\w\\W]*[\"]$"
+                + "|"
+                + Utils.RING_OPTION;
 
         Pattern pattern = Pattern.compile(regexToMatch);
         Matcher matcher = pattern.matcher(message);
@@ -332,5 +336,14 @@ public class SmsHandler {
             Utils.sendSms(smsManager, "Displayed on screen", sender);
         }
 
+        // ring
+        else if(providedOption.equals(Utils.RING_OPTION)){
+
+            Intent ringerActivityIntent = new Intent(context, RingerActivity.class);
+            ringerActivityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            context.startActivity(ringerActivityIntent);
+
+            Utils.sendSms(smsManager, "Ringing", sender);
+        }
     }
 }

src/app/src/main/java/com/xfarrow/locatemydevice/Utils.java

@@ -19,6 +19,7 @@ public class Utils {
     public static final String WIFI_OPTION = "wifi";
     public static final String LOCK_OPTION = "lock";
     public static final String SHOW_MESSAGE_OPTION = "show";
+    public static final String RING_OPTION = "ring";
     public static final String WIFI_ENABLE_SUBOPTION = "-enable";
     public static final String WIFI_DISABLE_SUBOPTION = "-disable";
 

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

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".RingerActivity">
+
+    <Button
+        android:id="@+id/stopButton"
+        android:layout_width="330dp"
+        android:layout_height="330dp"
+        android:text="STOP"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        android:textSize="50sp"/>
+</androidx.constraintlayout.widget.ConstraintLayout>