Android的谷歌地圖的保存位置

Question

我想嘗試做一些像ParkYourCar應用...當我按一下按鈕，我的位置應該保存，按鈕點擊谷歌地圖的佈局開始和加載我koords，當這就是做到了應該在那裏做一個標記。是否有可能將文件保存在文本文件中，在第一個佈局中，並將其加載到第二個佈局，即谷歌地圖？如果可能......我該怎麼辦？

與InputStreamReader的試了一下，等等...但不是我的應用程序chrashed：/

THX閱讀和回覆:)

我得到的第一個佈局的類在那裏你可以點擊一個按鈕：

public class ParkMyCarActivity extends ActionBarActivity implements View.OnClickListener{ 

private Button ParkMyCarButton; 
private Button LoadMyCarButton; 
String koordsFileLat = "koordsLat.txt"; 
String koordsFileLong = "koordsLong.txt"; 


String koordsLat; 
String koordsLong; 


private GoogleMap mMap; 




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

    LoadMyCarButton = (Button)findViewById(R.id.button_LoadMyCar); 

    ParkMyCarButton = (Button)findViewById(R.id.button_ParkMyCar); 
    ParkMyCarButton.setOnClickListener(new View.OnClickListener() { 

     LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
     Criteria criteria = new Criteria(); 
     String provider = locationManager.getBestProvider(criteria, true); 


     @Override 

     public void onClick(View ParkMyCar) { 

      startActivity(new Intent(ParkMyCarActivity.this, MapsActivity.class)); 

      Location myLocation = locationManager.getLastKnownLocation(provider); 

      double Latitude = myLocation.getLatitude(); 
      double Longitude = myLocation.getLongitude(); 

      koordsLat = String.valueOf(Latitude); 
      koordsLong = String.valueOf(Longitude); 


     } 




    }); 

而且谷歌地圖佈局：

public class MapsActivity extends FragmentActivity implements LocationListener, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener { 

private GoogleMap mMap; 


double latitude2 = 51.844188; 

double longitude2 = 8.301594; 

public static final String TAG = MapsActivity.class.getSimpleName(); 

private GoogleApiClient mGoogleApiClient; 

private LocationRequest myLocationRequest; 

static final LatLng florakoords = new LatLng(51.844188,8.301594); 

String savedKoordsLat; 
String savedKoordsLong; 









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

    // Macht andere GooglePlayServices einfacher zu benutzen 
    mGoogleApiClient = new GoogleApiClient.Builder(this) 
      .addConnectionCallbacks(this) 
      .addOnConnectionFailedListener(this) 
      .addApi(LocationServices.API) 
      .build(); 

    // Baut das LocationRequest objekt 
    myLocationRequest = LocationRequest.create() 
      .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY) 
      .setInterval(10 * 1000)  // 10 seconds, in millisekunden 
      .setFastestInterval(1 * 1000); // 1 second, in millisekunden 
} 



@Override 
protected void onResume() { 
    super.onResume(); 
    setUpMapIfNeeded(); 
} 





private void setUpMapIfNeeded() { 

    // Do a null check to confirm that we have not already instantiated the map. 
    if (mMap == null) { 

     // Try to obtain the map from the SupportMapFragment. 
     mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)) 
       .getMap(); 

     // Check if we were successful in obtaining the map. 
     if (mMap != null) { 
      setUpMap(); 
     } 
    } 
} 








private void setUpMap() { 


    mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker")); 

    // Erlaubt google maps meine Location zu nutzen 
    mMap.setMyLocationEnabled(true); 

    // Ist dazu da das LocationManager aus getSystemService "importiert" wird wofür LocationManager da ist keine ahnung ... 
    LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 


    // Create a criteria object to retrieve provider (Braucht man um später seine Location zu bestimmen) 
    Criteria criteria = new Criteria(); 

    // Get the name of the best provider (Ein string mit dem namen provider wird erschaffen, per LocationManager.getBestProvider wird der Name des providers wiedergegeben, der am besten zu criteria passt ... braucht man auch um seine LETZTE Location herauszufinden) 
    String provider = locationManager.getBestProvider(criteria, true); 

    // Get Current Location (Der finala part mit dem mann seine Location bekommt) 
    Location myLocation = locationManager.getLastKnownLocation(provider); 

    // set map type (hiermit setzte ich den Kartentyp) 
    mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL); 

    // Get latitude of the current location (Bekommtden Breitengrad meiner Position aus myLocation) 
    double latitude = myLocation.getLatitude(); 

    // Get longtitude of the current location (Bekomme den Längengrad meiner Position aus myLocation) 
    double longitude = myLocation.getLongitude(); 

    // Create a LatLng object for the current location (Latlng speichert die Längengrade und Breitengrade als Koordinaten) 
    LatLng latLng = new LatLng(latitude, longitude); 

    // Show the current location in Google Map (Zeigt die jetzige Location in einer "animation") 
    mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng)); 

    // Zoom in the Google Map (Zoomt zu unserer Position, Erschafft danach einen Marker an unserer Position mit der Nachricht "Du bist hier") 
    mMap.animateCamera(CameraUpdateFactory.zoomTo(14)); 

    // macht nichts ausser Ein Meldungsfenster zu öffnen ... 

    new AlertDialog.Builder(this).setMessage("Made by Lars Matthäus").setNeutralButton("ok",null).show(); 



    mMap.addMarker(new MarkerOptions().position(florakoords)); 





} 

// ------- -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- -----------------------------------

// Ist dazuda, um meine position zu ubdaten 

private void handleNewLocation(Location location) { 

    Marker flora = mMap.addMarker(new MarkerOptions() 
      .position(florakoords) 
      .title("Castle") 
      .alpha(0.7f)); 





    Log.d(TAG, location.toString()); 


    double currentLatitude = location.getLatitude(); 
    double currentLongitude = location.getLongitude(); 

    LatLng latLng = new LatLng(currentLatitude, currentLongitude); 

    mMap.addMarker(new MarkerOptions().position(latLng)).setSnippet("Ich bin hier"); 

    mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng)); 

    double entfernung = vergleicheDistanz(currentLatitude,currentLongitude, latitude2,longitude2); 


    //Rundet Entfernung 
    entfernung = Math.round(100.0 * entfernung)/100.0; 

    String entfernungString = String.valueOf(entfernung); 

    flora.setSnippet(entfernungString); 
    flora.showInfoWindow(); 




    if (entfernung <= 200.0){ 


     new AlertDialog.Builder(this).setMessage("Noch 200 Meter bis zum Auto!").setNeutralButton("ok",null).show(); 


    } 

    else { 

     new AlertDialog.Builder(this).setMessage("Über 200 meter bis zum Auto").setNeutralButton("ok",null).show(); 

    } 

} 

// ------ -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- ----------------------------------

public static float vergleicheDistanz(double latitude, double longitude, double latitude2, double longitude2) { 


    Location locationA = new Location("point A"); 
    locationA.setLatitude(latitude); 
    locationA.setLongitude(longitude); 

    Location locationB = new Location("point B"); 
    locationB.setLatitude(latitude2); 
    locationB.setLongitude(longitude2); 

    float distanz = locationA.distanceTo(locationB); 

    return distanz; 
} 





@Override 
public void onLocationChanged(Location location) { 

    handleNewLocation(location); 
} 





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

} 





@Override 
public void onProviderEnabled(String provider) { 

} 





@Override 
public void onProviderDisabled(String provider) { 

} 





@Override 
public void onConnected(Bundle bundle) { 

    Log.i(TAG, "Location Service Erfolgreich"); 

    //Fragt die letzte Location ab 
    Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient); 
    if (location == null) { 
     LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient ,myLocationRequest, (com.google.android.gms.location.LocationListener) this); 
    } 
    else { 
     handleNewLocation(location);} 
} 







@Override 
public void onConnectionSuspended(int i) { 

    Log.i(TAG, "Location Service gestoppt. Bitte neu starten"); 
} 





@Override 
public void onConnectionFailed(ConnectionResult connectionResult) { 

} 

}

Answer 1

private GoogleMap mMap; // Might be null if Google Play services APK is not available. 


private GoogleApiClient mGoogleApiClient; 
private LocationRequest myLocationRequest; 
public static final String TAG = GoogleMapsActivity.class.getSimpleName(); 

LocationListener listener; 



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



    // Macht andere GooglePlayServices einfacher zu benutzen 
    mGoogleApiClient = new GoogleApiClient.Builder(this) 
      .addApi(LocationServices.API) 
      .build(); 

    // Baut das LocationRequest objekt 
    myLocationRequest = LocationRequest.create() 
      .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY) 
      .setInterval(10 * 1000)  // 10 seconds, in millisekunden 
      .setFastestInterval(1 * 1000); // 1 second, in millisekunden 
} 










@Override 
protected void onResume() { 
    super.onResume(); 
    setUpMapIfNeeded(); 
} 

















private void setUpMapIfNeeded() { 
    // Do a null check to confirm that we have not already instantiated the map. 
    if (mMap == null) { 
     // Try to obtain the map from the SupportMapFragment. 
     mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)) 
       .getMap(); 
     // Check if we were successful in obtaining the map. 
     if (mMap != null) { 
      setUpMap(); 
     } 
    } 
} 










private void setUpMap() { 

    // Erlaubt google maps meine Location zu nutzen 
    mMap.setMyLocationEnabled(true); 

    // Ist dazu da das LocationManager aus getSystemService "importiert" wird wofür LocationManager da ist keine ahnung ... 
    LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 


    // Create a criteria object to retrieve provider (Braucht man um später seine Location zu bestimmen) 
    Criteria criteria = new Criteria(); 

    String provider = locationManager.getBestProvider(criteria, true); 


    Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); 
    if (location == null) { 
     // request location update!! 
     locationManager.requestLocationUpdates (LocationManager.GPS_PROVIDER, 1000, 0, this); 

    } 
    else { 

     double lat = location.getLatitude(); 
     double lon = location.getLongitude(); 


    } 





    // Show the current location in Google Map (Zeigt die jetzige Location in einer "animation") 

    //mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng)); 

    // Zoom in the Google Map (Zoomt zu unserer Position, Erschafft danach einen Marker an unserer Position mit der Nachricht "Du bist hier") 
    mMap.animateCamera(CameraUpdateFactory.zoomTo(14)); 


} 














@Override 
public void onLocationChanged(Location location) { 

} 

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

} 

@Override 
public void onProviderEnabled(String provider) { 

} 

@Override 
public void onProviderDisabled(String provider) { 

} 

}