Added automation support

app/src/main/java/eu/faircode/email/ServiceExternal.java

@@ -0,0 +1,46 @@
+package eu.faircode.email;
+
+import android.app.IntentService;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.preference.PreferenceManager;
+
+import androidx.annotation.Nullable;
+
+public class ServiceExternal extends IntentService {
+    private final static String ACTION_ENABLE = "eu.faircode.email.ENABLE";
+    private final static String ACTION_DISABLE = "eu.faircode.email.DISABLE";
+
+    // adb shell am startservice -a eu.faircode.email.ENABLE
+    // adb shell am startservice -a eu.faircode.email.DISABLE
+
+    public ServiceExternal() {
+        super(ServiceExternal.class.getName());
+    }
+
+    public ServiceExternal(String name) {
+        super(name);
+    }
+
+    @Override
+    protected void onHandleIntent(@Nullable Intent intent) {
+        if (intent == null)
+            return;
+
+        Boolean enabled = null;
+        if (ACTION_ENABLE.equals(intent.getAction()))
+            enabled = true;
+        else if (ACTION_DISABLE.equals(intent.getAction()))
+            enabled = false;
+
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
+        boolean previous = prefs.getBoolean("enabled", true);
+        if (enabled != null) {
+            prefs.edit().putBoolean("schedule", false).apply();
+            if (!enabled.equals(previous)) {
+                prefs.edit().putBoolean("enabled", enabled).apply();
+                ServiceSynchronize.reload(this, "external");
+            }
+        }
+    }
+}