Question

在这段代码中我想得到经度和纬度并将它们转换为字符串在屏幕上使用它和短信那我该怎么处理呢我应该上新课吗？或者只是修改了这段代码

我该怎么做才能让它发挥作用我使用了所有的位置

public class MainActivity extends Activity implements LocationListener  {

    Location location; // location

    LocationManager locationManager;
    public String LatTxt;
    public String LonTxt;
    public Double latitude; // latitude
    public Double longitude; // longitude
    TextView latTextView = (TextView) findViewById(R.id.Latitude_Txt);
    TextView lonTextView = (TextView) findViewById(R.id.Longitude_Txt);
    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = (long) (1000 * 60 * 0.25); // 0.25
                                                                                // minute

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

        LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        LocationListener locListener = new MyLocationListener();
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES,locListener);

        lonTextView.setText(" " + location.getLongitude());
        latTextView.setText(" " + location.getLatitude());

    }

    @Override
    public void onLocationChanged(Location location) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub
        latitude = location.getLatitude();
        LatTxt = latitude.toString();
        longitude = location.getLongitude();
        LonTxt = longitude.toString();
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }

}






<TextView
                    android:id="@+id/Latitude_Txt"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@android:color/white"
                    android:gravity="center_horizontal"
                    android:text="Latitude"
                    android:textColor="@android:color/black"
                    android:textSize="16sp" />
            </LinearLayout>

Answer 1

放

lonTextView.setText(" " + location.getLongitude());
latTextView.setText(" " + location.getLatitude());

到

@Override
public void onLocationChanged(Location location) {


}

您尝试在location中打印protected void onCreate(Bundle savedInstanceState)，但location未启动。

BTW，在行之前添加：

 lonTextView.setText(" " + location.getLongitude());
 latTextView.setText(" " + location.getLatitude());

此代码，初始化旧位置

locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES,this); 
Criteria criteria = new Criteria();

locationManager.getLastKnownLocation(provider);
String provider = locationManager.getBestProvider(criteria, false);
location = locationManager.getLastKnownLocation(provider);

并删除您的requestLocationUpdates

<强> [编辑]

 public class MainActivity extends Activity implements LocationListener  {

Location location; // location

LocationManager locationManager;
public String LatTxt;
public String LonTxt;
public Double latitude; // latitude
public Double longitude; // longitude
TextView latTextView = (TextView) findViewById(R.id.Latitude_Txt);
TextView lonTextView = (TextView) findViewById(R.id.Longitude_Txt);
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = (long) (1000 * 60 * 0.25); // 0.25
                                                                            // minute

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

    LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    LocationListener locListener = this;
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES,locListener);



}

@Override
public void onLocationChanged(Location location) {

    // TODO Auto-generated method stub
    latitude = location.getLatitude();
    LatTxt = latitude.toString();
    longitude = location.getLongitude();
    LonTxt = longitude.toString();

    lonTextView.setText(" " + location.getLongitude());
    latTextView.setText(" " + location.getLatitude());
}

@Override
public void onProviderDisabled(String provider) {
    // TODO Auto-generated method stub

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    // TODO Auto-generated method stub

 }
}

Answer 2

收到新的GPS坐标时。将调用onLocationChanged函数。你应该在那里进行GPS坐标操作

gps位置值不打印android

2 个答案: