Question

我正在尝试制作地图应用程序。

有两个活动需要获取当前位置。第一个活动是MainActivity，所有获取当前位置的代码都在其中。第二个是用户可以设置出发地的活动。当用户单击按钮将出发点设置为当前位置时，我需要从MainActivity获取值。

我制作了CurrentLocationDTO来解决此问题。但是以某种方式，当我在第二个活动中调用currentDTO.getLatitude（）时，它仅返回0.0。我不知道为什么即使在MainActivity中完成Jackson之后调用它也会返回初始化值。

我通过在每个类中编写currentDTO.setLatitude(value);来创建DTO对象。像这样做错了吗？还是有其他解决此问题的想法，请与我分享。

这是MainActivity.java

CurrentLocationDTO currentDTO = new CurrentLocationDTO();

这是CurrentLocationDTO.java

public class MainActivity extends AppCompatActivity {

private final String TAG = this.getClass().getSimpleName();

private final String TMAP_API_KEY = "10062d5b-d3d3-4b7d-8977-acd3ac2dc390";
LocationManager lm;
TMapView tMapView;
EditText Departure, Arrival;
Button Search;
LinearLayout Layout;
FloatingActionButton Current, Navigate;
String D_lon;
String D_lat;
String A_lon;
String A_lat;


//floatingActionButton 활성화/비활성화
Boolean FabActive = false; //navigate 버튼용
private ArrayList<TMapPoint> arPoint;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    LinearLayout linearLayoutTmap = (LinearLayout) findViewById(R.id.linearLayoutTmap);
    tMapView = new TMapView(this);
    lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE); //위치 관리자 객체 참조


    Departure = findViewById(R.id.departure);
    Arrival = findViewById(R.id.arrival);
    Search = findViewById(R.id.search);
    Layout = findViewById(R.id.search_layout);
    Current = findViewById(R.id.current_location);
    Navigate = findViewById(R.id.navigate);

    tMapView.setSKTMapApiKey(TMAP_API_KEY);
    linearLayoutTmap.addView(tMapView);
    tMapView.setIconVisibility(true);

    setGps();



    Departure.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivityForResult(new Intent(MainActivity.this, MapListActivity.class), 200);
        }
    });

    Arrival.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivityForResult(new Intent(MainActivity.this, MapListActivity.class), 300);
        }
    });
}




public void setGps() {
    //final LocationManager lm = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
            ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_COARSE_LOCATION, android.Manifest.permission.ACCESS_FINE_LOCATION}, 1);
    }

    lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, // 등록할 위치제공자(실내에선 NETWORK_PROVIDER 권장)
            1000, // 통지사이의 최소 시간간격 (miliSecond)
            1, // 통지사이의 최소 변경거리 (m)
            mLocationListener);

    lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, // 등록할 위치제공자(실내에선 NETWORK_PROVIDER 권장)
            1000, // 통지사이의 최소 시간간격 (miliSecond)
            1, // 통지사이의 최소 변경거리 (m)
            mLocationListener);

}

private LocationListener mLocationListener = new LocationListener() {
    public void onLocationChanged(Location location) {


        double latitude;
        double longitude;

        if (location != null) {
            CurrentLocationDTO currentLocationDTO = new CurrentLocationDTO();
            //I get values from location object here, and use setter to store it
            latitude = location.getLatitude();
            longitude = location.getLongitude();
            currentLocationDTO.setLatitude(latitude);
            currentLocationDTO.setLongitude(longitude);
            Log.e("Test", currentLocationDTO.getLatitude() + ", " + currentLocationDTO.getLongitude()); //I can get proper values here
            Log.e(TAG, latitude + " , " + longitude);
            tMapView.setLocationPoint(longitude, latitude);
            tMapView.setCenterPoint(longitude, latitude);

        }

    }

    public void onProviderDisabled(String provider) {
    }

    public void onProviderEnabled(String provider) {
    }

    public void onStatusChanged(String provider, int status, Bundle extras) {
    }
};

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    if (requestCode == 200) {
        if (resultCode == RESULT_OK) {
            String D_str = data.getStringExtra("selected");
            D_lat = data.getStringExtra("lat");
            D_lon = data.getStringExtra("lon");
            Departure.setText(D_str);
            // Toast.makeText(getApplicationContext(), "requestCode= " + requestCode, Toast.LENGTH_SHORT).show();
            // Toast.makeText(this, D_str, Toast.LENGTH_SHORT).show();
            Toast.makeText(this, "lat : " + D_lat + " lon : " + D_lon, Toast.LENGTH_SHORT).show();
        }
    }

    if (requestCode == 300) {
        if (resultCode == RESULT_OK) {
            String A_str = data.getStringExtra("selected");
            A_lat = data.getStringExtra("lat");
            A_lon = data.getStringExtra("lon");
            Arrival.setText(A_str);
            // Toast.makeText(getApplicationContext(), "requestCode= " + requestCode, Toast.LENGTH_SHORT).show();
            Toast.makeText(this, A_str, Toast.LENGTH_SHORT).show();
        }
    }
}
}

}

MapListActivity.java-我尝试使用package com.example.gpgpt.myapplication; public class CurrentLocationDTO { private double latitude; private double longitude; public double getLatitude() { return latitude; } public void setLatitude(double latitude) { this.latitude = latitude; } public double getLongitude() { return longitude; } public void setLongitude(double longitude) { this.longitude = longitude; }，但它返回DTO的初始值

getter

谢谢

Android，Java-如何在两个类中使用一个DTO

0 个答案: