在android中没有得到纬度和经度

Question

我在 Google 上搜索过这个问题，但没有得到 解决方案。我正在尝试获取设备位置的经度和纬度。 用户将单击相机中的图像，那时我必须得到 使用 GPS 的设备的纬度、经度并显示。但不是 工作。

这是我的代码：-

 public class MainActivity extends Activity {

    EditText editAddress,editName;
    ImageView ivPhoto;
    Button btnTakePic,btnNext1;
    Bitmap bitMap;
    static int TAKE_PICTURE = 1;

    protected LocationManager locationManager;
    protected LocationListener locationListener;
    protected Context context;
    TextView txtLat;
    String lat;
    String provider;
    protected double latitude,longitude;
    protected boolean gps_enabled,network_enabled;

    private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1; // in Meters

    private static final long MINIMUM_TIME_BETWEEN_UPDATES = 1000; // in Milliseconds


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        editAddress = (EditText)findViewById(R.id.edtAddress);
        editName = (EditText)findViewById(R.id.edtName);
        ivPhoto = (ImageView)findViewById(R.id.ivPhoto);
        btnTakePic = (Button)findViewById(R.id.btnTakePic);
        btnNext1 = (Button)findViewById(R.id.btnNext1);


        btnTakePic.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(intent,TAKE_PICTURE);

            }
        });

        btnNext1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent nextIntent = new Intent(MainActivity.this,ContactPersonDetail.class);
                startActivity(nextIntent);
            }
        });
    }

    private void GetLocationLatLong() {


        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

      //  locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,MINIMUM_TIME_BETWEEN_UPDATES, MINIMUM_DISTANCE_CHANGE_FOR_UPDATES, new MyLocationListener());

        Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

        if(location!=null){


            String message = String.format("Current Location \\n Longitude: %1$s \\n Latitude: %2$s",location.getLongitude(), location.getLatitude());
            Toast.makeText(MainActivity.this,message,Toast.LENGTH_SHORT).show();
        }

    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {

        if (requestCode == TAKE_PICTURE && resultCode== RESULT_OK && intent != null){
            // get bundle
            Bundle extras = intent.getExtras();

            // get bitmap
            bitMap = (Bitmap) extras.get("data");
            ivPhoto.setImageBitmap(bitMap);

            GetLocationLatLong();

        }
    }

    private class MyLocationListener implements LocationListener{



        @Override
        public void onLocationChanged(Location location) {
            String message = String.format("New Location \n Longitude: %1$s \n Latitude: %2$s", location.getLongitude(), location.getLatitude() );

            longitude = location.getLongitude();
            latitude = location.getLatitude();

            Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();

            Log.d("Longittuteeeeeeeeeeee",message);
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {




            Toast.makeText(MainActivity.this, "Provider status changed",Toast.LENGTH_LONG).show();


        }

        @Override
        public void onProviderEnabled(String provider) {
            Toast.makeText(MainActivity.this,"Provider enabled by the user. GPS turned on", Toast.LENGTH_LONG).show();

        }

        @Override
        public void onProviderDisabled(String provider) {

            Toast.makeText(MainActivity.this, "Provider disabled by the user. GPS turned off", Toast.LENGTH_LONG).show();

        }
    }


}

这些是清单中使用的权限：-

 <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_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.CONTROL_LOCATION_UPDATES" />
<uses-permission android:name="android.permission.INTERNET"/>

在这些权限中，有两个权限（ACCESS_MOCK_LOCATION,CONTROL_LOCATION_UPDATES）出错。

权限错误：-

使用权限 android:name="android.permission.ACCESS_MOCK_LOCATION"

只能在测试或调试特定的情况下请求模拟位置 清单文件（通常是 src/debug/AndroidManifest.xml）少... (Ctrl+F1) 使用模拟位置提供程序（通过要求权限 android.permission.ACCESS_MOCK_LOCATION）只能在调试中完成 构建（或来自测试）。在 Gradle 项目中，这意味着您应该只 在特定的测试或调试源集中请求此权限 清单文件。要解决此问题，请在调试中创建一个新的清单文件 文件夹并将元素移动到那里。一个典型的路径 Gradle 项目中的调试清单覆盖文件是 src/debug/AndroidManifest.xml.

请让我知道我在这里做错了什么。

Answer 1

您的 GetLocationLatLong 函数的这一部分必须在您的 onCreate 方法中：

locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
   locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,MINIMUM_TIME_BETWEEN_UPDATES, MINIMUM_DISTANCE_CHANGE_FOR_UPDATES, new MyLocationListener());

您应该在该方法之前设置 requestLocationUpdates。其余的应该可以正常工作。

另外，您不需要这些权限：

<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />

<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />

<uses-permission android:name="android.permission.CONTROL_LOCATION_UPDATES" />

Answer 2

尝试使用它。我目前正在使用这个来获取设备的当前位置。

public class GPSHelper {

private Context mContext;
// flag for GPS Status
private boolean isGPSEnabled = false;
// flag for network status
private boolean isNetworkEnabled = false;
private LocationManager locationManager;
private double latitude;
private double longitude;

public GPSHelper(Context context) {
    mContext = context;

    locationManager = (LocationManager) context
            .getSystemService(Context.LOCATION_SERVICE);

}

public LatLng getMyLocation() {
    List<String> providers = locationManager.getProviders(true);

    Location l = null;
    for (int i = 0; i < providers.size(); i++) {
        l = locationManager.getLastKnownLocation(providers.get(i));
        if (l != null)
            break;
    }
    if (l != null) {
        latitude = l.getLatitude();
        longitude = l.getLongitude();
    }

    return new LatLng(latitude, longitude);
}

public boolean isGPSenabled() {
    isGPSEnabled = locationManager
            .isProviderEnabled(LocationManager.GPS_PROVIDER);

    // getting network status
    isNetworkEnabled = locationManager
            .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

    return (isGPSEnabled || isNetworkEnabled);
}

/**
 * Function to get latitude
 */
public double getLatitude() {
    return latitude;
}

/**
 * Function to get longitude
 */
public double getLongitude() {
    return longitude;
}
}

用法：

GPSHelper gpsHelper = new GPSHelper(getActivity());//I'm creating this object inside a fragment
LatLng currentLatLng = gpsHelper.getMyLocation();
currentLat = currentLatLng.latitude;
currentLng = currentLatLng.longitude;

权限：

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