uniapp项目app后台持续获取定位信息保活怎么做

要实现在后台持续获取定位信息并保持应用程序活动，需要使用以下步骤：

1. 在manifest文件中添加以下权限：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />

2. 在代码中创建一个LocationManager对象来获取位置信息：

var locationManager = plus.android.importClass("android.location.LocationManager");
var locationListener = plus.android.importClass("android.location.LocationListener");
var criteria = new plus.android.importClass("android.location.Criteria");
var context = plus.android.runtimeMainActivity();
var provider = locationManager.getBestProvider(criteria(), true);
var location = locationManager.getLastKnownLocation(provider);

3. 使用LocationListener来监听位置变化：

var locationListener = plus.android.implements("android.location.LocationListener", {
    "onLocationChanged": function(location) {
        console.log("Location changed: " + location.getLatitude() + ", " + location.getLongitude());
    },
    "onProviderDisabled": function(provider) {
        console.log("Provider disabled: " + provider);
    },
    "onProviderEnabled": function(provider) {
        console.log("Provider enabled: " + provider);
    },
    "onStatusChanged": function(provider, status, extras) {
        console.log("Status changed: " + provider + ", " + status + ", " + extras);
    }
});

locationManager.requestLocationUpdates(provider, 0, 0, locationListener, null);

4. 在服务中运行后台定位：

var serviceIntent = new plus.android.newObject("android.content.Intent", context, plus.android.importClass("com.example.LocationService"));
context.startService(serviceIntent);

5. 创建一个LocationService类，在其中实现后台定位：

public class LocationService extends Service {
    private LocationManager locationManager;
    private LocationListener locationListener;
    private String provider;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();

        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        Criteria criteria = new Criteria();
        provider = locationManager.getBestProvider(criteria, false);
        locationListener = new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {
                Log.d("LocationService", "Location changed: " + location.getLatitude() + ", " + location.getLongitude());
            }

            @Override
            public void onStatusChanged(String provider, int status, Bundle extras) {
                Log.d("LocationService", "Status changed: " + provider + ", " + status + ", " + extras);
            }

            @Override
            public void onProviderEnabled(String provider) {
                Log.d("LocationService", "Provider enabled: " + provider);
            }

            @Override
            public void onProviderDisabled(String provider) {
                Log.d("LocationService", "Provider disabled: " + provider);
            }
        };
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        locationManager.requestLocationUpdates(provider, 0, 0, locationListener);
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        locationManager.removeUpdates(locationListener);
    }
}

这样就可以在后台持续获取定位信息并保持应用程序活动了。需要注意的是，由于Android 10及以上版本的限制，需要在应用程序的设置中开启后台定位权限，否则应用程序将无法在后台获取定位信息。