Add Java tutorials.

java/2-IncomingCall/README.md

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+Incoming call tutorial
+====================
+
+This tutorial will focus on how the app will be notified when a call is being received and how to either accept it or terminate it.
+
+We'll also cover how to toggle the microphone and the speakerphone during an active call.
+
+If you want to test it on either a device, you'll need another SIP client to make the call. If you don't, you can use the [outgoing call tutorial](https://gitlab.linphone.org/BC/public/tutorials/-/tree/master/java/4-OutgoingCall) to do it.

java/2-IncomingCall/build.gradle

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+plugins {
+  id 'application'
+  id 'org.openjfx.javafxplugin' version '0.1.0'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation files('linphone-sdk.jar')
+}
+
+javafx {
+    modules = [ 'javafx.controls', 'javafx.fxml' ]
+}
+
+mainClassName = 'LinphoneJavaFX'

java/2-IncomingCall/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

java/2-IncomingCall/gradlew

@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

java/2-IncomingCall/gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

java/2-IncomingCall/src/main/java/LinphoneJavaFX.java

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+/*
+ * Copyright (c) 2010-2024 Belledonne Communications SARL.
+ *
+ * This file is part of Linphone Java Tutorial.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import controller.ScreenController;
+import javafx.application.Application;
+import javafx.scene.Parent;
+import javafx.scene.Scene;
+import javafx.stage.Stage;
+import service.CoreService;
+import javafx.fxml.FXMLLoader;
+
+public class LinphoneJavaFX extends Application {
+
+    @Override
+    public void start(Stage stage) throws Exception {
+        Parent root = FXMLLoader.load(getClass().getResource("/view/LoginPage.fxml"));
+        stage.setTitle("Linphone SDK example");
+        stage.setScene(new Scene(root));
+
+        ScreenController screenController = new ScreenController(stage.getScene());
+        screenController.add("login", "/view/LoginPage.fxml");
+        screenController.add("call", "/view/CallPage.fxml");
+        screenController.activate("login");
+        CoreService.instance().screenController = screenController;
+        stage.show();
+    }
+
+    @Override
+    public void stop() {
+        CoreService.instance().stop();
+        System.exit(0);
+    }
+
+    public static void main(String[] args) {
+        launch();
+    }
+
+}

java/2-IncomingCall/src/main/java/controller/CallController.java

@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2010-2024 Belledonne Communications SARL.
+ *
+ * This file is part of Linphone Java Tutorial.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package controller;
+
+import org.linphone.core.Call;
+import org.linphone.core.Core;
+import org.linphone.core.CoreListenerStub;
+import org.linphone.core.Reason;
+
+import javafx.fxml.FXML;
+import javafx.scene.control.Button;
+import javafx.scene.control.Label;
+import javafx.scene.control.TextField;
+import javafx.scene.control.TitledPane;
+import javafx.scene.layout.VBox;
+import service.CoreService;
+
+public class CallController extends CoreListenerStub implements ScreenInterface {
+    private CoreService coreService = CoreService.instance();
+    private Call incomingCall;
+
+    @FXML
+    private TitledPane callPane;
+
+    @FXML
+    private Button hangupButton;
+
+    @FXML
+    private Button muteSoundButton;
+
+    @FXML
+    private Button muteMicrophoneButton;
+
+    @FXML
+    private VBox incomingCallVBox;
+
+    @FXML
+    private Label incomingCallLabel;
+
+    @FXML
+    private Button answerButton;
+
+    @FXML
+    private Button declineButton;
+
+    @FXML
+    private Label callLabel;
+
+    @FXML
+    private void onHangUpClicked() {
+        coreService.core.terminateAllCalls();
+    }
+
+    @FXML
+    private void onMuteSoundClicked() {
+        if (coreService.toggleSpeaker()) {
+            muteSoundButton.setText("Activate sound");
+        } else {
+            muteSoundButton.setText("Mute sound");
+        }
+    }
+
+    @FXML
+    private void onMuteMicrophoneClicked() {
+        if (coreService.toggleMicrophone()) {
+            muteMicrophoneButton.setText("Activate microphone");
+        } else {
+            muteMicrophoneButton.setText("Mute microphone");
+        }
+    }
+
+    @FXML
+    private void onAnswerClicked() {
+        if (incomingCall == null)
+            return;
+
+        incomingCall.accept();
+        incomingCall = null;
+    }
+
+    @FXML
+    private void onDeclineClicked() {
+        if (incomingCall == null)
+            return;
+
+        incomingCall.decline(Reason.Declined);
+        incomingCall = null;
+    }
+
+    private void callInProgressGuiUpdates() {
+        incomingCallVBox.setVisible(false);
+        hangupButton.setDisable(false);
+        muteSoundButton.setDisable(false);
+        muteMicrophoneButton.setDisable(false);
+    }
+
+    private void endingCallGuiUpdates() {
+        incomingCallVBox.setVisible(false);
+        hangupButton.setDisable(true);
+        muteSoundButton.setDisable(true);
+        muteSoundButton.setText("Mute sound");
+        muteMicrophoneButton.setDisable(true);
+        muteMicrophoneButton.setText("Mute microphone");
+    }
+
+    public void onCallStateChanged(Core core, Call call, Call.State state, String message) {
+        callLabel.setText("Your call state is: " + state.toString());
+        switch (state) {
+            case IncomingReceived:
+                incomingCall = call;
+                incomingCallVBox.setVisible(true);
+                incomingCallLabel.setText(incomingCall.getRemoteAddress().asString());
+                break;
+            case StreamsRunning:
+                callInProgressGuiUpdates();
+                break;
+            case Error:
+            case End:
+            case Released:
+                incomingCall = null;
+                endingCallGuiUpdates();
+                break;
+            default:
+                break;
+        }
+    }
+
+    @Override
+    public void onNavigatedFrom() {
+        coreService.core.removeListener(this);
+    }
+
+    @Override
+    public void onNavigatedTo() {
+        callPane.setText("Hello " + coreService.core.getDefaultProxyConfig().findAuthInfo().getUsername());
+        coreService.core.addListener(this);
+        if (coreService.core.getCurrentCall() != null) {
+            onCallStateChanged(coreService.core, coreService.core.getCurrentCall(),
+                    coreService.core.getCurrentCall().getState(), null);
+        }
+    }
+}

java/2-IncomingCall/src/main/java/controller/LoginController.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2010-2024 Belledonne Communications SARL.
+ *
+ * This file is part of Linphone Java Tutorial.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package controller;
+
+import java.net.URL;
+import java.util.ResourceBundle;
+
+import javafx.fxml.FXML;
+import javafx.fxml.Initializable;
+import javafx.scene.control.Button;
+import javafx.scene.control.Label;
+import javafx.scene.control.PasswordField;
+import javafx.scene.control.TextField;
+import service.CoreService;
+
+import org.linphone.core.Account;
+import org.linphone.core.Core;
+import org.linphone.core.CoreListenerStub;
+import org.linphone.core.RegistrationState;
+
+public class LoginController extends CoreListenerStub implements Initializable, ScreenInterface {
+    @FXML
+    private Button loginButton;
+    @FXML
+    private TextField identityField;
+    @FXML
+    private PasswordField passwordField;
+    @FXML
+    private Label registrationLabel;
+
+    private CoreService coreService = CoreService.instance();
+
+    @FXML
+    public void initialize(URL location, ResourceBundle resourceBundle) {
+        coreService.start();
+    }
+
+    @FXML
+    private void onLoginClicked() {
+        if (loginButton.isDisabled())
+            return;
+        loginButton.setDisable(true);
+        coreService.login(identityField.getText(), passwordField.getText());
+    }
+
+    @Override
+    public void onAccountRegistrationStateChanged(Core core, Account account, RegistrationState state, String message) {
+        registrationLabel.setText("Your registration state is: " + state.toString());
+        switch (state) {
+            case Cleared:
+            case None:
+                coreService.clearCoreAfterLogout();
+                loginButton.setDisable(false);
+                break;
+            case Ok:
+                loginButton.setDisable(true);
+                coreService.screenController.activate("call");
+                break;
+            case Progress:
+                loginButton.setDisable(true);
+                break;
+            case Failed:
+                loginButton.setDisable(false);
+                break;
+            default:
+                break;
+        }
+    }
+
+    @Override
+	public void onNavigatedFrom() {
+        coreService.core.removeListener(this);
+	}
+
+	@Override
+	public void onNavigatedTo() {
+        coreService.core.addListener(this);
+	}
+}

java/2-IncomingCall/src/main/java/controller/ScreenController.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2010-2024 Belledonne Communications SARL.
+ *
+ * This file is part of Linphone Java Tutorial.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package controller;
+
+import java.io.IOException;
+import java.util.HashMap;
+
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Parent;
+import javafx.scene.Scene;
+
+class Screen {
+    public Parent root;
+    public FXMLLoader loader;
+
+    Screen(Parent root, FXMLLoader loader) {
+        this.root = root;
+        this.loader = loader;
+    }
+}
+
+public class ScreenController {
+    private HashMap<String, Screen> screenMap = new HashMap<>();
+    private Scene main;
+    private Screen currentScreen;
+
+    public ScreenController(Scene main) {
+        this.main = main;
+    }
+
+    public void add(String name, String viewFile) throws IOException {
+        FXMLLoader loader = new FXMLLoader(getClass().getResource(viewFile));
+        Parent root = loader.load();
+        screenMap.put(name, new Screen(root, loader));
+    }
+
+    public void remove(String name) {
+        screenMap.remove(name);
+    }
+
+    public void activate(String name) {
+        if (currentScreen != null) {
+            currentScreen.loader.<ScreenInterface>getController().onNavigatedFrom();
+        }
+        currentScreen = screenMap.get(name);
+        main.setRoot(currentScreen.root);
+        currentScreen.loader.<ScreenInterface>getController().onNavigatedTo();
+    }
+}

java/2-IncomingCall/src/main/java/controller/ScreenInterface.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2010-2024 Belledonne Communications SARL.
+ *
+ * This file is part of Linphone Java Tutorial.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package controller;
+
+public interface ScreenInterface {
+    public void onNavigatedFrom();
+    public void onNavigatedTo();
+}

java/2-IncomingCall/src/main/java/service/CoreService.java

@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2010-2024 Belledonne Communications SARL.
+ *
+ * This file is part of Linphone Java Tutorial.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package service;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Timer;
+import java.util.TimerTask;
+
+import org.linphone.core.Account;
+import org.linphone.core.AccountParams;
+import org.linphone.core.Address;
+import org.linphone.core.AuthInfo;
+import org.linphone.core.Call;
+import org.linphone.core.CallParams;
+import org.linphone.core.Core;
+import org.linphone.core.CoreListenerStub;
+import org.linphone.core.Factory;
+import org.linphone.core.GlobalState;
+import org.linphone.core.LogLevel;
+import org.linphone.core.LoggingService;
+import org.linphone.core.VideoActivationPolicy;
+
+import controller.ScreenController;
+import javafx.application.Platform;
+
+public class CoreService extends CoreListenerStub {
+    private static CoreService instance;
+
+    public Core core;
+    public ScreenController screenController;
+    public IterateRunnable iterateRunnable;
+    private Timer iterateTimer;
+
+    private CoreService() {
+        Factory factory = Factory.instance();
+        factory.setDataDir(".");
+
+        LoggingService loggingService = factory.getLoggingService();
+        loggingService.setLogLevel(LogLevel.Message);
+
+        core = factory.createCore("", "", null);
+        core.setAudioPort(7666);
+        core.setUserCertificatesPath(Paths.get("").toString());
+    }
+
+    public static CoreService instance() {
+        if (instance == null) {
+            instance = new CoreService();
+        }
+        return instance;
+    }
+
+    public void start() {
+        this.core.start();
+        iterateRunnable = new IterateRunnable();
+        iterateTimer = new Timer();
+        iterateTimer.schedule(new IterateTimerTask(), 20, 20);
+    }
+
+    public void stop() {
+        core.stop();
+    }
+
+    public void login(String identity, String password) {
+        Address address = Factory.instance().createAddress(identity);
+        AuthInfo authInfo = Factory.instance().createAuthInfo(address.getUsername(), "", password, "", "",
+                address.getDomain());
+        core.addAuthInfo(authInfo);
+
+        AccountParams accountParams = core.createAccountParams();
+        accountParams.setIdentityAddress(address);
+        Address serverAddress = Factory.instance().createAddress("sip:" + address.getDomain() + ";transport=tls");
+        accountParams.setServerAddress(serverAddress);
+        accountParams.setRegisterEnabled(true);
+
+        Account account = core.createAccount(accountParams);
+        core.addAccount(account);
+        core.setDefaultAccount(account);
+    }
+
+    public void logout() {
+        Account account = core.getDefaultAccount();
+        if (account != null) {
+            AccountParams accountParams = account.getParams().clone();
+            accountParams.setRegisterEnabled(false);
+            account.setParams(accountParams);
+        }
+    }
+
+    /// Mute/Unmute your microphone.
+    /// Setting to false on the Core mutes your microphone globally.
+    public Boolean toggleMicrophone() {
+        core.setMicEnabled(!core.isMicEnabled());
+        return core.isMicEnabled();
+    }
+
+    /// Enable/Disable the speaker sound.
+    /// setSpeakerMuted(true) on a Call object disables the sound output of this call.
+    public Boolean toggleSpeaker() {
+        core.getCurrentCall().setSpeakerMuted(!core.getCurrentCall().getSpeakerMuted());
+        return core.getCurrentCall().getSpeakerMuted();
+    }
+
+    public void clearCoreAfterLogout() {
+        core.clearAllAuthInfo();
+        core.clearAccounts();
+    }
+
+    @Override
+    public void onGlobalStateChanged(Core core, GlobalState state, String message) {
+        if (state == GlobalState.Off) {
+            iterateTimer.cancel();
+        }
+    }
+}
+
+class IterateTimerTask extends TimerTask {
+    @Override
+    public void run() {
+        Platform.runLater(CoreService.instance().iterateRunnable);
+    }
+}
+
+class IterateRunnable implements Runnable {
+    @Override
+    public void run() {
+        CoreService.instance().core.iterate();
+    }
+
+}

java/2-IncomingCall/src/main/resources/view/CallPage.fxml

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.control.Button?>
+<?import javafx.scene.control.Label?>
+<?import javafx.scene.control.TextField?>
+<?import javafx.scene.control.TitledPane?>
+<?import javafx.scene.layout.AnchorPane?>
+<?import javafx.scene.layout.ColumnConstraints?>
+<?import javafx.scene.layout.GridPane?>
+<?import javafx.scene.layout.HBox?>
+<?import javafx.scene.layout.RowConstraints?>
+<?import javafx.scene.layout.VBox?>
+
+<TitledPane fx:id="callPane" alignment="TOP_CENTER" animated="false" collapsible="false" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" text="Hello" xmlns="http://javafx.com/javafx/17" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controller.CallController">
+  <content>
+    <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
+         <children>
+            <VBox alignment="CENTER" prefHeight="200.0" prefWidth="100.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
+               <children>
+                  <VBox alignment="CENTER" prefHeight="200.0" prefWidth="100.0">
+                     <children>
+                        <Label fx:id="callLabel" alignment="CENTER" text="Your call state is: Idle" />
+                        <HBox alignment="CENTER" prefHeight="100.0" prefWidth="200.0" spacing="35.0">
+                           <children>
+                            <Button fx:id="hangupButton" disable="true" mnemonicParsing="false" onMouseClicked="#onHangUpClicked" text="Hang up" />
+                              <Button fx:id="muteSoundButton" disable="true" mnemonicParsing="false" onMouseClicked="#onMuteSoundClicked" text="Mute sound" />
+                              <Button fx:id="muteMicrophoneButton" disable="true" mnemonicParsing="false" onMouseClicked="#onMuteMicrophoneClicked" text="Mute microphone" />
+                           </children>
+                        </HBox>
+                     </children>
+                     <VBox.margin>
+                        <Insets top="20.0" />
+                     </VBox.margin>
+                  </VBox>
+                  <VBox fx:id="incomingCallVBox" alignment="CENTER" prefHeight="200.0" prefWidth="100.0" visible="false">
+                     <children>
+                        <Label text="You have a call from:" />
+                        <Label fx:id="incomingCallLabel" />
+                        <HBox alignment="CENTER" prefHeight="100.0" prefWidth="200.0" spacing="35.0">
+                           <children>
+                              <Button fx:id="answerButton" mnemonicParsing="false" onMouseClicked="#onAnswerClicked" text="Answer" />
+                              <Button fx:id="declineButton" mnemonicParsing="false" onMouseClicked="#onDeclineClicked" text="Decline" />
+                           </children>
+                        </HBox>
+                     </children>
+                  </VBox>
+               </children>
+            </VBox>
+         </children></AnchorPane>
+  </content>
+</TitledPane>

java/2-IncomingCall/src/main/resources/view/LoginPage.fxml

@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.control.Button?>
+<?import javafx.scene.control.ButtonBar?>
+<?import javafx.scene.control.Label?>
+<?import javafx.scene.control.PasswordField?>
+<?import javafx.scene.control.Separator?>
+<?import javafx.scene.control.TextField?>
+<?import javafx.scene.control.TitledPane?>
+<?import javafx.scene.layout.AnchorPane?>
+<?import javafx.scene.layout.ColumnConstraints?>
+<?import javafx.scene.layout.FlowPane?>
+<?import javafx.scene.layout.GridPane?>
+<?import javafx.scene.layout.RowConstraints?>
+
+<TitledPane alignment="TOP_CENTER" animated="false" collapsible="false" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" text="Login Form" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/17" fx:controller="controller.LoginController">
+  <content>
+    <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
+         <children>
+            <FlowPane alignment="TOP_CENTER" columnHalignment="CENTER" layoutX="199.0" layoutY="54.0" orientation="VERTICAL" prefHeight="200.0" prefWidth="200.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
+               <children>
+                  <GridPane>
+                    <columnConstraints>
+                      <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
+                      <ColumnConstraints hgrow="ALWAYS" minWidth="10.0" prefWidth="350.0" />
+                    </columnConstraints>
+                    <rowConstraints>
+                      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
+                      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
+                    </rowConstraints>
+                     <children>
+                        <Label text="Identity:" />
+                        <TextField fx:id="identityField" maxWidth="350.0" minWidth="350.0" prefWidth="350.0" GridPane.columnIndex="1" />
+                        <Label text="Password:" GridPane.rowIndex="1" />
+                        <PasswordField fx:id="passwordField" maxWidth="350.0" minWidth="350.0" prefWidth="350.0" GridPane.columnIndex="1" GridPane.rowIndex="1" />
+                     </children>
+                     <FlowPane.margin>
+                        <Insets bottom="20.0" top="20.0" />
+                     </FlowPane.margin>
+                  </GridPane>
+                  <Label fx:id="registrationLabel" prefWidth="0.0">
+                     <FlowPane.margin>
+                        <Insets />
+                     </FlowPane.margin>
+                  </Label>
+                  <Separator prefWidth="200.0" />
+                  <ButtonBar prefHeight="40.0" prefWidth="200.0">
+                    <buttons>
+                      <Button fx:id="loginButton" mnemonicParsing="false" onMouseClicked="#onLoginClicked" text="Login" />
+                    </buttons>
+                  </ButtonBar>
+               </children>
+            </FlowPane>
+         </children></AnchorPane>
+  </content>
+</TitledPane>