传递价值另一个活动

Question

I made a WeatherSyncAdapterClass, I create a method and get the latitude and longitude value from GPS.

public void getGPS(){
    Context context = WeatherSyncAdapter.super.getContext();
    gps = new GpsTrack(context);
    if (gps.canGetLocation()) {
        while (lat == 0.0 && lon == 0.0) {
            setLat(gps.getLatitude());
            setLon(gps.getLongitude());
            latitude = Double.toString(lat);
            longitude = Double.toString(lon);
        }
    }
    else {
        gps.showSettingsAlert();
    }
}

...and then I set the URI value for the "locationsetting" with this statement:

    public void setLatLon(double a, double b) {
    //Double.toString(weather.getLatitude()+weather.getLongitude())
    LatLon = Double.toString(a+b);
}

(I just set the uri for the location setting from addition latitude and longitude ^_^, I know this is stupid)

My question is how to pass the "LatLon" value to the "mainActivity" for matching the URI? I know intent will pass the value but i think thats will be bad solution cause will (maybe) open the another activity.

please help me :(((

Answer 1

Intent intent = new Intent(current.this, mainActivity.class);
intent.putExtra("Lat",Double.toString(a));
intent.putExtra("Lon",Double.toString(b));
startActivity(intent);

Using the intents you can pass values to other activities. intent.putExtra method/function will send data in form of key,value pair.

In the MainActivity.class you can use following code to retrive the data from intent

Intent intent = getIntent();
String latitude = intent.getStringExtra("Lat");
String longitude = intent.getStringExtra("Lon");