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ANDROID: new module androidforeground
In order to avoid being killed by Android apps are supposed to register a notification/service. Usage: (foreground-service! #t) ;; start service (foreground-service! #f) ;; stop service
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‎modules/androidforeground/ANDROID_c_additions‎

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/* androidforeground -*-C-*- */
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int android_start_ln_foreground_service()
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{
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JNIEnv *env = GetJNIEnv();
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if (env&&globalObj){
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jclass main_class = (*env)->FindClass(env, "@SYS_PACKAGE_SLASH@/@SYS_APPNAME@");
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jmethodID method = main_class ? (*env)->GetMethodID(env, main_class, "startLnForegroundService", "()V") : NULL;
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if(main_class) (*env)->DeleteLocalRef(env, main_class);
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if(!method) {
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JNI_forward_exception_to_gambit(env);
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return -1;
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}
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(*env)->CallVoidMethod(env, globalObj, method);
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(*env)->DeleteLocalRef(env, method);
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if(JNI_forward_exception_to_gambit(env)) { return -2; }
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return 0;
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}
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}
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int android_stop_ln_foreground_service()
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{
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JNIEnv *env = GetJNIEnv();
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if (env&&globalObj){
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jclass main_class = (*env)->FindClass(env, "@SYS_PACKAGE_SLASH@/@SYS_APPNAME@");
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jmethodID method = main_class ? (*env)->GetMethodID(env, main_class, "stopLnForegroundService", "()V") : NULL;
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if(main_class) (*env)->DeleteLocalRef(env, main_class);
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if(!method) {
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JNI_forward_exception_to_gambit(env);
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return -1;
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}
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(*env)->CallVoidMethod(env, globalObj, method);
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(*env)->DeleteLocalRef(env, method);
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if(JNI_forward_exception_to_gambit(env)) { return -2; }
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return 0;
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}
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}
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/* EOF androidforeground */

‎modules/androidforeground/ANDROID_java_activityadditions‎

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/* androidforeground -*- mode: java; c-basic-offset: 2; -*- */
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void startLnForegroundService() {
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/* API 26+: In order to compile for prior API versions comment out
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* the following attempt to disable battery optimizations
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*/
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@IF_ANDROIDAPI_GT_22@
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if(Build.VERSION.SDK_INT>Build.VERSION_CODES.LOLLIPOP_MR1) {
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String pkg=getPackageName();
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PowerManager pm=getSystemService(PowerManager.class);
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if(!pm.isIgnoringBatteryOptimizations(pkg)) {
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// See also the comment in ANDROID_xml_permissions: Google may
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// not like the required
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// ACTION_IGNORE_BATTERY_OPTIMIZATION_SETTINGS permission
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// being used.
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//
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// If it is not requested in the permissions file,
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// uncomment the following startActivityForResult(...) and
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// comment out startActivity(...) in the line after.
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// startActivityForResult(new Intent(Settings.ACTION_IGNORE_BATTERY_OPTIMIZATION_SETTINGS), 0);
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startActivity(new Intent(Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS).setData(Uri.parse("package:"+pkg)));
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}
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}
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// end of IF_ANDROIDAPI_GT_22 */
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startService(new Intent(this, LambdaNativeForegroundService.class));
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}
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void stopLnForegroundService() {
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stopService(new Intent(this, LambdaNativeForegroundService.class));
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}
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/* EOF androidforeground */

‎modules/androidforeground/ANDROID_java_imports‎

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import android.provider.Settings;
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import android.os.Build;

‎modules/androidforeground/ANDROID_java_public_LambdaNativeForegroundService.in‎

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/* -*- mode: java; c-basic-offset: 2; -*- */
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package @SYS_PACKAGE_DOT@;
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@IF_ANDROIDAPI_GT_25@
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import android.app.NotificationChannel;
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import android.app.NotificationManager;
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/* end of IF_ANDROIDAPI_GT_25 */
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import android.util.Log;
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import android.app.Service;
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import android.app.Notification;
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import android.app.Notification.Builder;
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//import android.support.v4.app.NotificationCompat;
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import android.content.Intent;
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import android.os.IBinder;
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import android.os.SystemClock;
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public class LambdaNativeForegroundService extends Service {
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final static int notificationIsRunningId = 1;
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boolean running=true;
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Thread backgroundThread;
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public LambdaNativeForegroundService() {
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}
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private Notification.Builder make_notification_template() {
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return new Notification.Builder(this)
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.setContentTitle(getString(R.string.app_name))
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// .setContentText("TBD")
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.setSmallIcon(R.drawable.icon)
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// .setLargeIcon(aBitmap)
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.setOngoing(true);
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}
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private void keepAwake_LT_API26() {
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startForeground(notificationIsRunningId, make_notification_template().build());
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}
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private void keepAwake() {
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@IF_ANDROIDAPI_GT_25@
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if(true) {
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NotificationManager mgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
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assert mgr != null;
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NotificationChannel channel =
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new NotificationChannel ("@SYS_PACKAGE_DOT@", ".working", NotificationManager.IMPORTANCE_NONE);
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mgr.createNotificationChannel(channel);
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Notification.Builder mknote = make_notification_template()
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.setChannelId("@SYS_PACKAGE_DOT@")
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.setCategory(Notification.CATEGORY_SERVICE);
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startForeground(notificationIsRunningId, mknote.build());
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return;
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}
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/* end of IF_ANDROIDAPI_GT_25 */
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keepAwake_LT_API26();
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}
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@Override
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public IBinder onBind(Intent intent) {
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throw new UnsupportedOperationException("Not implemented");
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}
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@Override
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public void onCreate() {
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// Log.d("","LambdaNativeForegroundService created");
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super.onCreate();
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keepAwake();
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}
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@Override
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public void onStart(Intent intent, int startId) {
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// Log.d("","LambdaNativeForegroundService starting");
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}
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@Override public int onStartCommand(Intent intent, int flags, int startId) {
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super.onStartCommand(intent, flags, startId);
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return START_STICKY;
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}
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@Override
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public void onDestroy() {
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// running=false;
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// Log.d("","LambdaNativeForegroundService stopped");
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}
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// This is bound in the main class only!!! native void nativeEvent(int t, int x, int y);
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}

‎modules/androidforeground/ANDROID_xml_permissions‎

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<uses-feature android:name="android.permission.FOREGROUND_SERVICE" android:required="true" />
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<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" android:required="false" />
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<!--
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With API level 26 REQUEST_IGNORE_BATTERY_OPTIMIZATIONS might be
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appropriate to enable services to continuesly run.
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However: Google is reported to remove apps needing this permission:
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https://commonsware.com/blog/2015/11/11/google-anti-trust-issues.html
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If this is bothering you, remove this comment and the permission below
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and modify ANDROID_java_activityadditions to use the alternative,
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- though rather impractical - method.
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-->
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<uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" android:required="false" />
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‎modules/androidforeground/ANDROID_xml_services‎

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<service android:name=".LambdaNativeForegroundService" android:enabled="true" />

‎modules/androidforeground/androidforeground.scm‎

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;; this module creates an android service to drive the native lambdanative payload in the background
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;; Usage:
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;;
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;; (foreground-service! #t) ;; start service
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;;
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;; (foreground-service! #f) ;; stop service
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(c-declare "int android_start_ln_foreground_service();")
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(c-declare "int android_stop_ln_foreground_service();")
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(define foreground-service!
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(let ((running #f)
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(start! (c-lambda () int "
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#if defined(__ANDROID__)
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___return(android_start_ln_foreground_service());
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#else
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___return(0);
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#endif
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"))
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(stop! (c-lambda () int "
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#if defined(__ANDROID__)
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___return(android_stop_ln_foreground_service());
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#else
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___return(0);
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#endif
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")))
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(lambda (flag)
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(cond
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((and flag (not running))
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(set! running #t)
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(let ((result (start!)))
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(when (negative? result) (log-error "foreground-service! failed to start " result))))
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((and (not flag) running)
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(set! running #f)
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(let ((result (stop!)))
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(when (negative? result) (log-error "foreground-service! failed to stop " result))))))))

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