Android service setup

sbapp/patches/PythonService.java

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+package org.kivy.android;
+
+import android.os.Build;
+import java.lang.reflect.Method;
+import java.lang.reflect.InvocationTargetException;
+import android.app.Service;
+import android.os.IBinder;
+import android.os.Bundle;
+import android.content.Intent;
+import android.content.Context;
+import android.util.Log;
+import android.app.Notification;
+import android.app.PendingIntent;
+import android.os.Process;
+import java.io.File;
+
+//imports for channel definition
+import android.app.NotificationManager;
+import android.app.NotificationChannel;
+import android.graphics.Color;
+import android.graphics.BitmapFactory;
+import android.graphics.Bitmap;
+import android.graphics.drawable.Icon;
+
+import android.net.wifi.WifiManager;
+import android.net.wifi.WifiManager.MulticastLock;
+
+public class PythonService extends Service implements Runnable {
+
+    // Thread for Python code
+    private Thread pythonThread = null;
+
+    // Python environment variables
+    private String androidPrivate;
+    private String androidArgument;
+    private String pythonName;
+    private String pythonHome;
+    private String pythonPath;
+    private String serviceEntrypoint;
+    // Argument to pass to Python code,
+    private String pythonServiceArgument;
+
+
+    public static PythonService mService = null;
+    private Intent startIntent = null;
+
+    private boolean autoRestartService = false;
+
+    public void setAutoRestartService(boolean restart) {
+        autoRestartService = restart;
+    }
+
+    public int startType() {
+        return START_NOT_STICKY;
+    }
+
+    @Override
+    public IBinder onBind(Intent arg0) {
+        return null;
+    }
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        if (pythonThread != null) {
+            Log.v("python service", "service exists, do not start again");
+            return startType();
+        }
+    //intent is null if OS restarts a STICKY service
+        if (intent == null) {
+            Context context = getApplicationContext();
+            intent = getThisDefaultIntent(context, "");
+        }
+
+        startIntent = intent;
+        Bundle extras = intent.getExtras();
+        androidPrivate = extras.getString("androidPrivate");
+        androidArgument = extras.getString("androidArgument");
+        serviceEntrypoint = extras.getString("serviceEntrypoint");
+        pythonName = extras.getString("pythonName");
+        pythonHome = extras.getString("pythonHome");
+        pythonPath = extras.getString("pythonPath");
+        boolean serviceStartAsForeground = (
+            extras.getString("serviceStartAsForeground").equals("true")
+        );
+        pythonServiceArgument = extras.getString("pythonServiceArgument");
+        pythonThread = new Thread(this);
+        pythonThread.start();
+
+        if (serviceStartAsForeground) {
+            doStartForeground(extras);
+        }
+
+        return startType();
+    }
+
+    protected int getServiceId() {
+        return 1;
+    }
+
+    protected Intent getThisDefaultIntent(Context ctx, String pythonServiceArgument) {
+        return null;
+    }
+
+    protected void doStartForeground(Bundle extras) {
+        String serviceTitle = extras.getString("serviceTitle");
+        String serviceDescription = extras.getString("serviceDescription");
+        Notification notification;
+        Context context = getApplicationContext();
+        Intent contextIntent = new Intent(context, PythonActivity.class);
+        PendingIntent pIntent = PendingIntent.getActivity(context, 0, contextIntent,
+            PendingIntent.FLAG_UPDATE_CURRENT);
+
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
+            notification = new Notification(
+                context.getApplicationInfo().icon, serviceTitle, System.currentTimeMillis());
+            try {
+                // prevent using NotificationCompat, this saves 100kb on apk
+                Method func = notification.getClass().getMethod(
+                    "setLatestEventInfo", Context.class, CharSequence.class,
+                    CharSequence.class, PendingIntent.class);
+                func.invoke(notification, context, serviceTitle, serviceDescription, pIntent);
+            } catch (NoSuchMethodException | IllegalAccessException |
+                     IllegalArgumentException | InvocationTargetException e) {
+            }
+        } else {
+            // for android 8+ we need to create our own channel
+            // https://stackoverflow.com/questions/47531742/startforeground-fail-after-upgrade-to-android-8-1
+            String NOTIFICATION_CHANNEL_ID = "org.kivy.p4a";    //TODO: make this configurable
+            String channelName = "Background Service";                //TODO: make this configurable
+            NotificationChannel chan = new NotificationChannel(NOTIFICATION_CHANNEL_ID, channelName, 
+                NotificationManager.IMPORTANCE_NONE);
+            
+            chan.setLightColor(Color.BLUE);
+            chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
+            NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
+            manager.createNotificationChannel(chan);
+
+            Notification.Builder builder = new Notification.Builder(context, NOTIFICATION_CHANNEL_ID);
+            builder.setContentTitle("Sideband");
+            builder.setContentText("Reticulum Running");
+            builder.setContentIntent(pIntent);
+
+            Bitmap icon_bitmap = BitmapFactory.decodeFile("/data/user/0/io.unsigned.sideband/files/app/assets/notification_icon.png");
+            Icon service_icon = Icon.createWithBitmap(icon_bitmap);
+            // builder.setSmallIcon(context.getApplicationInfo().icon);
+            builder.setSmallIcon(service_icon);
+            notification = builder.build();
+
+            // Log.v("python service", "Testing WM locks...");
+            // WifiManager wm = (WifiManager) getSystemService(Context.WIFI_SERVICE);
+            // MulticastLock ml = wm.createMulticastLock("sometag");
+            // Log.v("python service", "WM locks done");
+
+
+        }
+        startForeground(getServiceId(), notification);
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        pythonThread = null;
+        if (autoRestartService && startIntent != null) {
+            Log.v("python service", "service restart requested");
+            startService(startIntent);
+        }
+        Process.killProcess(Process.myPid());
+    }
+
+    /**
+     * Stops the task gracefully when killed.
+     * Calling stopSelf() will trigger a onDestroy() call from the system.
+     */
+    @Override
+    public void onTaskRemoved(Intent rootIntent) {
+        super.onTaskRemoved(rootIntent);
+        //sticky servcie runtime/restart is managed by the OS. leave it running when app is closed
+        if (startType() != START_STICKY) {
+            stopSelf();
+        }
+    }
+
+    @Override
+    public void run(){
+        String app_root =  getFilesDir().getAbsolutePath() + "/app";
+        File app_root_file = new File(app_root);
+        PythonUtil.loadLibraries(app_root_file,
+            new File(getApplicationInfo().nativeLibraryDir));
+        this.mService = this;
+        nativeStart(
+            androidPrivate, androidArgument,
+            serviceEntrypoint, pythonName,
+            pythonHome, pythonPath,
+            pythonServiceArgument);
+        stopSelf();
+    }
+
+    // Native part
+    public static native void nativeStart(
+            String androidPrivate, String androidArgument,
+            String serviceEntrypoint, String pythonName,
+            String pythonHome, String pythonPath,
+            String pythonServiceArgument);
+}