當前位置不會自動顯示到TextView的

目前，我想要得到的緯度和經度的用戶當前的位置，但我的代碼可以得到，直到我在模擬器設置按下發送按鈕，但我要的是自動獲取位置和將它設置爲textview，我該怎麼辦？任何人請指教我解決這個問題，因爲我真的不熟悉位置代碼。當前位置不會自動顯示到TextView的

這裏是我的代碼

package com.example.rex.ota30; 

import android.*; 
import android.Manifest; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.content.pm.PackageManager; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 
import android.provider.Settings; 
import android.support.v4.app.ActivityCompat; 
import android.support.v7.app.AlertDialog; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.TextView; 
import android.widget.Toast; 

import com.google.firebase.database.DatabaseReference; 
import com.google.firebase.database.FirebaseDatabase; 

import static com.example.rex.ota30.R.id.textView; 

public class Search extends AppCompatActivity implements LocationListener { 

private FirebaseDatabase db; 
private DatabaseReference sref, lref; 
private TextView searchun, searchlo, searchla; 
private String un, la, lo; 
private LocationManager lm; 
private LocationListener ll; 

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

    db = FirebaseDatabase.getInstance(); 

    sref = db.getReference("users"); 
    lref = db.getReference("userslocation"); 

    searchun = (TextView) findViewById(R.id.sun); 
    Intent i = this.getIntent(); 
    un = i.getStringExtra("username"); 
    searchun.setText(un); 

    searchlo = (TextView) findViewById(R.id.slo); 
    searchla = (TextView) findViewById(R.id.sla); 

    lm = (LocationManager) 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) { 

     return; 
    } 
    lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, (LocationListener) this); 
} 

@Override 
public void onLocationChanged(Location location) { 

    la = String.valueOf(location.getLatitude()); 
    searchla.setText(la); 

    lo = String.valueOf(location.getLongitude()); 
    searchlo.setText(lo); 

    lref.child(un).child("latitude").setValue(la); 
    lref.child(un).child("longitude").setValue(lo); 
} 

@Override 
public void onProviderDisabled(String provider) { 
    Log.d("Latitude","disable"); 
} 

@Override 
public void onProviderEnabled(String provider) { 
    Log.d("Latitude","enable"); 
} 

@Override 
public void onStatusChanged(String provider, int status, Bundle extras) { 
    Log.d("Latitude","status"); 
} 
}

這裏是獲取位置的樣品。

來源

2017-09-19 Rex You

在模擬器是你需要設置緯度和經度第一 –

或檢查實際設備 –

但我認爲模擬器已經得到了位置？ –

時的位置發生了變化OnLocationChanged只調用。
所以位置顯示在TextView中僅在按下發送按鈕。
如果你想顯示從一開始的位置，試試這個

protected void onCreate(Bundle savedInstanceState) { 
    ... 
    lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, (LocationListener) this); 
    ... 
    // add code 
    Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER); 
    la = String.valueOf(location.getLatitude()); 
    searchla.setText(la); 

    lo = String.valueOf(location.getLongitude()); 
    searchlo.setText(lo); 
}

來源

2017-09-19 07:07:09 amuyu

解決了它。謝謝。 –

爲什麼目前無法運行？ –

import android.content.pm.PackageManager; 
import android.location.Location; 
import android.support.annotation.NonNull; 
import android.support.annotation.Nullable; 
import android.support.v4.app.ActivityCompat; 
import android.support.v4.app.FragmentActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.Toast; 

import com.google.android.gms.common.ConnectionResult; 
import com.google.android.gms.common.api.GoogleApiClient; 
import com.google.android.gms.location.LocationServices; 
import com.google.android.gms.maps.CameraUpdateFactory; 
import com.google.android.gms.maps.GoogleMap; 
import com.google.android.gms.maps.OnMapReadyCallback; 
import com.google.android.gms.maps.SupportMapFragment; 
import com.google.android.gms.maps.model.LatLng; 
import com.google.android.gms.maps.model.Marker; 
import com.google.android.gms.maps.model.MarkerOptions; 

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, 
     GoogleApiClient.ConnectionCallbacks, 
     GoogleApiClient.OnConnectionFailedListener, 
     GoogleMap.OnMarkerDragListener, 
     GoogleMap.OnMapLongClickListener, 
     GoogleMap.OnMarkerClickListener, 
     View.OnClickListener { 

    private static final String TAG = "MapsActivity"; 
    private GoogleMap mMap; 
    private double longitude; 
    private double latitude; 
    private GoogleApiClient googleApiClient; 


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

     // Obtain the SupportMapFragment and get notified when the map is ready to be used. 
     SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() 
       .findFragmentById(R.id.map); 
     mapFragment.getMapAsync(this); 

     //Initializing googleApiClient 
     googleApiClient = new GoogleApiClient.Builder(this) 
       .addConnectionCallbacks(this) 
       .addOnConnectionFailedListener(this) 
       .addApi(LocationServices.API) 
       .build(); 
    } 


    @Override 
    public void onMapReady(GoogleMap googleMap) { 
     mMap = googleMap; 
     mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID); 
     // googleMapOptions.mapType(googleMap.MAP_TYPE_HYBRID) 
        // .compassEnabled(true); 

     // Add a marker in Sydney and move the camera 
     LatLng india = new LatLng(-34, 151); 
     mMap.addMarker(new MarkerOptions().position(india).title("Marker in India")); 
     mMap.moveCamera(CameraUpdateFactory.newLatLng(india)); 
     mMap.setOnMarkerDragListener(this); 
     mMap.setOnMapLongClickListener(this); 
    } 

    //Getting current location 
    private void getCurrentLocation() { 
     mMap.clear(); 
     if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 
      // TODO: Consider calling 
      // ActivityCompat#requestPermissions 
      // here to request the missing permissions, and then overriding 
      // public void onRequestPermissionsResult(int requestCode, String[] permissions, 
      //           int[] grantResults) 
      // to handle the case where the user grants the permission. See the documentation 
      // for ActivityCompat#requestPermissions for more details. 
      return; 
     } 
     Location location = LocationServices.FusedLocationApi.getLastLocation(googleApiClient); 
     if (location != null) { 
      //Getting longitude and latitude 
      longitude = location.getLongitude(); 
      latitude = location.getLatitude(); 

      //moving the map to location 
      moveMap(); 
     } 
    } 

    private void moveMap() { 
     /** 
     * Creating the latlng object to store lat, long coordinates 
     * adding marker to map 
     * move the camera with animation 
     */ 
     LatLng latLng = new LatLng(latitude, longitude); 
     mMap.addMarker(new MarkerOptions() 
       .position(latLng) 
       .draggable(true) 
       .title("Marker in India")); 

     mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng)); 
     mMap.animateCamera(CameraUpdateFactory.zoomTo(15)); 
     mMap.getUiSettings().setZoomControlsEnabled(true); 


    } 

    @Override 
    public void onClick(View view) { 
     Log.v(TAG,"view click event"); 
    } 

    @Override 
    public void onConnected(@Nullable Bundle bundle) { 
     getCurrentLocation(); 
    } 

    @Override 
    public void onConnectionSuspended(int i) { 

    } 

    @Override 
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) { 

    } 

    @Override 
    public void onMapLongClick(LatLng latLng) { 
     // mMap.clear(); 
     mMap.addMarker(new MarkerOptions().position(latLng).draggable(true)); 
    } 

    @Override 
    public void onMarkerDragStart(Marker marker) { 
     Toast.makeText(MapsActivity.this, "onMarkerDragStart", Toast.LENGTH_SHORT).show(); 
    } 

    @Override 
    public void onMarkerDrag(Marker marker) { 
     Toast.makeText(MapsActivity.this, "onMarkerDrag", Toast.LENGTH_SHORT).show(); 
    } 

    @Override 
    public void onMarkerDragEnd(Marker marker) { 
     // getting the Co-ordinates 
     latitude = marker.getPosition().latitude; 
     longitude = marker.getPosition().longitude; 

     //move to current position 
     moveMap(); 
    } 

    @Override 
    protected void onStart() { 
     googleApiClient.connect(); 
     super.onStart(); 
    } 

    @Override 
    protected void onStop() { 
     googleApiClient.disconnect(); 
     super.onStop(); 
    } 


    @Override 
    public boolean onMarkerClick(Marker marker) { 
     Toast.makeText(MapsActivity.this, "onMarkerClick", Toast.LENGTH_SHORT).show(); 
     return true; 
    } 

}

來源

2017-09-19 06:23:44 param

不工作...仍然需要按在模擬器設置 –

發送按鈕我認爲獲取調用 – param

所以，現在我應該怎麼辦onLocation變化？ –

當前位置不會自動顯示到TextView的

回答

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