feat(gpsrelaysentinel): 使用SP标记管理服务状态并支持自启动

- onStartCommand返回START_STICKY实现服务自启动
- onStartCommand直接设置SP标记为启用，不检查现有标记
- onCreate时检查SP标记，已启用则自动启动GPS
- onDestroy不再改变SP标记
- MainActivity stopService前先设置SP标记为不启用

gpsrelaysentinel/src/main/java/cc/winboll/studio/gpsrelaysentinel/MainActivity.java

@@ -1,5 +1,6 @@
 package cc.winboll.studio.gpsrelaysentinel;
 
+import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.os.Bundle;
@@ -88,6 +89,11 @@ public class MainActivity extends AppCompatActivity {
     }
 
     private void stopService() {
+        // 先设置SP标记为不启用
+        MainActivity.this.getSharedPreferences(MainService.PREF_NAME, Context.MODE_PRIVATE)
+            .edit()
+            .putBoolean(MainService.KEY_SERVICE_ENABLED, false)
+            .apply();
         Intent intent = new Intent(MainActivity.this, MainService.class);
         stopService(intent);
         ToastUtils.show("GPS Service stopped");

gpsrelaysentinel/src/main/java/cc/winboll/studio/gpsrelaysentinel/MainService.java

@@ -26,6 +26,8 @@ public class MainService extends Service {
     private NotificationCompat.Builder mNotificationBuilder;
     private static final String CHANNEL_ID = "gps_relay_channel";
     private static final int NOTIFICATION_ID = 1;
+    private static final String PREF_NAME = "gps_relay_service_prefs";
+    private static final String KEY_SERVICE_ENABLED = "service_enabled";
 
     @Override
     public void onCreate() {
@@ -33,15 +35,29 @@ public class MainService extends Service {
         LogUtils.d(TAG, "Service onCreate");
         mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
         createNotificationChannel();
+        if (isServiceEnabled()) {
+            LogUtils.d(TAG, "Service was enabled, starting GPS updates");
+            run();
+        }
     }
 
     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
         LogUtils.d(TAG, "Service onStartCommand");
+        setServiceEnabled(true);
         run();
         return START_STICKY;
     }
 
+    private boolean isServiceEnabled() {
+        return getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE).getBoolean(KEY_SERVICE_ENABLED, false);
+    }
+
+    private void setServiceEnabled(boolean enabled) {
+        getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE).edit().putBoolean(KEY_SERVICE_ENABLED, enabled).apply();
+        LogUtils.d(TAG, "Service enabled set to: " + enabled);
+    }
+
     private void run() {
         if (mIsRunning) {
             LogUtils.d(TAG, "GPS updates already running");