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android: add an example
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‎examples/android/app/build.gradle‎

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apply plugin: 'com.android.application'
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android {
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compileSdk 34
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ndkVersion "25.2.9519653"
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defaultConfig {
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applicationId "com.libremidi.example"
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minSdk 31
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targetSdk 34
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versionCode 1
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versionName "1.0"
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externalNativeBuild {
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cmake {
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cppFlags "-std=c++20 -frtti -fexceptions"
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arguments "-DANDROID_STL=c++_shared"
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}
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}
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ndk {
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abiFilters 'arm64-v8a', 'armeabi-v7a', 'x86', 'x86_64'
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}
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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
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}
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}
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externalNativeBuild {
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cmake {
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path "src/main/cpp/CMakeLists.txt"
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version "3.22.1"
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}
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}
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compileOptions {
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sourceCompatibility JavaVersion.VERSION_11
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targetCompatibility JavaVersion.VERSION_11
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}
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namespace 'com.libremidi.example'
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}
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dependencies {
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implementation 'androidx.appcompat:appcompat:1.6.1'
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implementation 'com.google.android.material:material:1.11.0'
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implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
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}

‎examples/android/app/src/main/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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<uses-feature android:name="android.software.midi" android:required="true" />
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<uses-permission android:name="android.permission.BIND_MIDI_DEVICE_SERVICE" />
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<application
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android:allowBackup="true"
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android:icon="@android:drawable/ic_menu_manage"
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android:label="LibreMIDI Example"
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android:theme="@style/Theme.AppCompat.Light.DarkActionBar">
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<activity
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android:name=".MainActivity"
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android:exported="true">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎examples/android/app/src/main/cpp/CMakeLists.txt‎

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cmake_minimum_required(VERSION 3.22.1)
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project(libremidi-example)
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set(CMAKE_CXX_STANDARD 20)
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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# Find libremidi in the parent directory
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set(LIBREMIDI_NO_ANDROID 0)
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set(BUILD_SHARED_LIBS 1)
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set(LIBREMIDI_ROOT "${CMAKE_CURRENT_SOURCE_DIR}/../../../../../..")
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add_subdirectory(${LIBREMIDI_ROOT} libremidi-build)
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# Create shared library
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add_library(libremidi-example SHARED
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native-lib.cpp
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)
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# Link libremidi
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target_link_libraries(libremidi-example
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libremidi
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android
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log
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)
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# Include directories
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target_include_directories(libremidi-example PRIVATE
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${LIBREMIDI_ROOT}/include
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)

‎examples/android/app/src/main/cpp/native-lib.cpp‎

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#include <jni.h>
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#include <string>
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#include <vector>
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#include <sstream>
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#include <libremidi/libremidi.hpp>
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#include <android/log.h>
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extern "C" JNIEXPORT jstring JNICALL
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Java_com_libremidi_example_MainActivity_getMidiDevices(JNIEnv* env, jobject /* this */) {
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std::stringstream result;
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__android_log_print(ANDROID_LOG_WARN, "libremidi", "Java_com_libremidi_example_MainActivity_getMidiDevices!!");
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try {
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auto api = libremidi::API::ANDROID_AMIDI;
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libremidi::observer obs{{.track_any = true}, libremidi::observer_configuration_for(api)};
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result << "=== MIDI Input Devices ===\n";
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auto inputs = obs.get_input_ports();
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if (inputs.empty()) {
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result << "No input devices found\n";
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} else {
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for (const auto& port : inputs) {
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result << "Port " << port.port << ": " << port.port_name;
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if (!port.device_name.empty() && port.device_name != port.port_name) {
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result << " (Device: " << port.device_name << ")";
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}
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if (!port.display_name.empty() && port.display_name != port.port_name) {
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result << " [" << port.display_name << "]";
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}
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result << "\n";
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__android_log_print(ANDROID_LOG_WARN, "libremidi", "opening: %s", port.port_name.c_str());
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auto midi_in = new libremidi::midi_in{{.on_message{[](const libremidi::message& m) {
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__android_log_print(ANDROID_LOG_WARN, "libremidi", "ayy!!");
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}}}, libremidi::midi_in_configuration_for(api)};
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auto p = midi_in->get_current_api();
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__android_log_print(ANDROID_LOG_WARN, "libremidi", ">> ??! %s", libremidi::get_api_name(p).data());
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__android_log_print(ANDROID_LOG_WARN, "libremidi", ">> open port?!");
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midi_in->open_port(port);
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}
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}
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result << "\n=== MIDI Output Devices ===\n";
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auto outputs = obs.get_output_ports();
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if (outputs.empty()) {
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result << "No output devices found\n";
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} else {
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for (const auto& port : outputs) {
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result << "Port " << port.port << ": " << port.port_name;
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if (!port.device_name.empty() && port.device_name != port.port_name) {
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result << " (Device: " << port.device_name << ")";
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}
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if (!port.display_name.empty() && port.display_name != port.port_name) {
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result << " [" << port.display_name << "]";
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}
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result << "\n";
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}
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}
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} catch (const std::exception& e) {
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result << "Error: " << e.what() << "\n";
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}
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__android_log_print(ANDROID_LOG_WARN, "libremidi", "FINITO!!");
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return env->NewStringUTF(result.str().c_str());
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}
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extern "C" JNIEXPORT jstring JNICALL
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Java_com_libremidi_example_MainActivity_getLibremidiVersion(JNIEnv* env, jobject /* this */) {
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return env->NewStringUTF("libremidi Android example");
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}

‎examples/android/app/src/main/java/com/libremidi/example/MainActivity.java‎

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package com.libremidi.example;
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import androidx.appcompat.app.AppCompatActivity;
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import android.os.Bundle;
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import android.widget.TextView;
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import android.widget.Button;
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import android.widget.ScrollView;
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import android.view.ViewGroup.LayoutParams;
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import android.widget.LinearLayout;
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import android.graphics.Typeface;
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import android.util.TypedValue;
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public class MainActivity extends AppCompatActivity {
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static {
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System.loadLibrary("libremidi-example");
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}
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private TextView deviceListTextView;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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LinearLayout layout = new LinearLayout(this);
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layout.setOrientation(LinearLayout.VERTICAL);
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layout.setPadding(16, 16, 16, 16);
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TextView titleView = new TextView(this);
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titleView.setText("LibreMIDI Android Example");
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titleView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 24);
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titleView.setTypeface(null, Typeface.BOLD);
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titleView.setPadding(0, 0, 0, 16);
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layout.addView(titleView);
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TextView versionView = new TextView(this);
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versionView.setText(getLibremidiVersion());
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versionView.setPadding(0, 0, 0, 16);
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layout.addView(versionView);
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Button refreshButton = new Button(this);
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refreshButton.setText("Refresh MIDI Devices");
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refreshButton.setOnClickListener(v -> refreshDevices());
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layout.addView(refreshButton);
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ScrollView scrollView = new ScrollView(this);
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deviceListTextView = new TextView(this);
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deviceListTextView.setTypeface(Typeface.MONOSPACE);
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deviceListTextView.setPadding(0, 16, 0, 0);
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scrollView.addView(deviceListTextView);
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LinearLayout.LayoutParams scrollParams = new LinearLayout.LayoutParams(
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LayoutParams.MATCH_PARENT,
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LayoutParams.MATCH_PARENT
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);
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scrollParams.weight = 1;
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layout.addView(scrollView, scrollParams);
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setContentView(layout);
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refreshDevices();
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}
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private void refreshDevices() {
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String devices = getMidiDevices();
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deviceListTextView.setText(devices);
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}
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public native String getMidiDevices();
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public native String getLibremidiVersion();
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}

‎examples/android/app/src/main/java/dev/celtera/libremidi/MidiDeviceCallback.java‎

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package dev.celtera.libremidi;
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import android.media.midi.MidiDevice;
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import android.media.midi.MidiManager;
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import android.util.Log;
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public class MidiDeviceCallback implements MidiManager.OnDeviceOpenedListener {
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private static final String TAG = "libremidi";
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private long nativePtr;
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private boolean isOutput;
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public MidiDeviceCallback(long ptr, boolean output) {
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nativePtr = ptr;
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isOutput = output;
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}
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@Override
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public void onDeviceOpened(MidiDevice device) {
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if (device == null) {
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Log.e(TAG, "Failed to open MIDI device");
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return;
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}
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Log.i(TAG, "MIDI device opened successfully");
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onDeviceOpened(device, nativePtr, isOutput);
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}
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// Native method declaration
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private native void onDeviceOpened(MidiDevice device, long targetPtr, boolean isOutput);
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static {
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// Load the native library containing the JNI implementation
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// System.loadLibrary("remidi");
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}
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}

‎examples/android/build.gradle‎

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buildscript {
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repositories {
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google()
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mavenCentral()
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}
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dependencies {
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classpath 'com.android.tools.build:gradle:8.11.1'
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}
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}
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allprojects {
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repositories {
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google()
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mavenCentral()
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}
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}
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task clean(type: Delete) {
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delete rootProject.buildDir
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}

‎examples/android/gradle.properties‎

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org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
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android.useAndroidX=true
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android.nonTransitiveRClass=true

‎examples/android/gradle/wrapper/gradle-wrapper.jar‎

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‎examples/android/gradle/wrapper/gradle-wrapper.properties‎

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distributionBase=GRADLE_USER_HOME
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distributionPath=wrapper/dists
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distributionUrl=https\://services.gradle.org/distributions/gradle-9.0-milestone-1-bin.zip
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networkTimeout=10000
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validateDistributionUrl=true
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zipStoreBase=GRADLE_USER_HOME
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zipStorePath=wrapper/dists

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