Android：如何保存GPS座標，並在找到時開始新的活動？

Question

我試圖創建一個簡單的應用程序，從而GPS座標將被存儲，並且只顯示在下一個活動的屏幕上。

到目前爲止，我已經設法讓座標顯示在吐司上，所以我知道代碼正在工作。我在邏輯上遇到問題。當我找到經度和緯度時，我試圖開始一個新的活動（一個將顯示座標）。

任何人都可以提供任何建議，如何我可以做這樣的事情？

public class GPSActivity extends Activity{ 

float longitude  = 0; 
float latitude  = 0; 


@Override 
public void onCreate(Bundle savedInstanceState) { 

super.onCreate(savedInstanceState); 
setContentView(R.layout.main); 


/* Use the LocationManager class to obtain GPS locations */ 
LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
LocationListener mlocListener = new MyLocationListener(); 

mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mlocListener); 

Intent intent = new Intent(this, Display.class); 
Bundle extras = new Bundle(); 


do{ 
    extras.putFloat("long", longitude); 
    extras.putFloat("lat", latitude); 
}while(longitude == 0); 


// if longitude is no longer zero - meaning it is found 
// add extras and call activity. 
if(longitude != 0){ 
    intent.putExtras(extras); 
    startActivity(intent); 
}} // end activity 






/* Class My Location Listener */ 
public class MyLocationListener implements LocationListener { 



@Override 
public void onLocationChanged(Location loc) { 

longitude = (float) loc.getLatitude(); 
latitude = (float) loc.getLongitude(); 

String text = "My current location is: " + "Latitud = " + loc.getLatitude() + "Longitud = " + loc.getLongitude(); 

Toast.makeText(getApplicationContext(), text, Toast.LENGTH_SHORT).show(); 

} 



@Override 
public void onProviderDisabled(String provider){ 

Toast.makeText(getApplicationContext(), "Gps Disabled", Toast.LENGTH_SHORT).show(); 
} 


@Override 
public void onProviderEnabled(String provider) { 

Toast.makeText(getApplicationContext(), "Gps Enabled", Toast.LENGTH_SHORT).show(); 
} 


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

}} // End GPS activity 

Answer 1

不知道爲什麼你已經把那部分中的onCreate（），但如果你將其移動到onLocationChanged（）它應該工作。

public class GPSActivity extends Activity{ 

    float longitude  = 0; 
    float latitude  = 0; 


    @Override 
    public void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 


     /* Use the LocationManager class to obtain GPS locations */ 
     LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
     LocationListener mlocListener = new MyLocationListener(); 

     mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mlocListener); 

    } 

    /* Class My Location Listener */ 
    public class MyLocationListener implements LocationListener {   

    @Override 
    public void onLocationChanged(Location loc) { 

     longitude = (float) loc.getLatitude(); 
     latitude = (float) loc.getLongitude(); 

     String text = "My current location is: " + "Latitud = " + loc.getLatitude() + "Longitud = " + loc.getLongitude(); 

     Toast.makeText(getApplicationContext(), text, Toast.LENGTH_SHORT).show(); 

     Intent intent = new Intent(GPSActivity.this, Display.class); 
     Bundle extras = new Bundle();   

     extras.putFloat("long", longitude); 
     extras.putFloat("lat", latitude);   

     intent.putExtras(extras); 
     startActivity(intent);  

    }