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Save Google Maps to SharedPreferences

 1 year ago
source link: https://www.codesd.com/item/save-google-maps-to-sharedpreferences.html
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Save Google Maps to SharedPreferences

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I'm trying to store my GMaps markers, so when I press back button, and back another time to my maps activity, show my markers on screen.

I've checked out this post Save state when back button is pressed and I got some results, but I'm still far way from my initial objective.

Now I can see my first marker and my last one.

Here goes my code:

public class MapsActivity extends FragmentActivity {

    private GoogleMap mMap; // Might be null if Google Play services APK is not available.
    private List<Marker> markerList;

    public MapsActivity(){
        if(markerList == null){
            markerList = new ArrayList<Marker>();
        }
    }

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

        setUpMapIfNeeded();

        LoadPreferences();
        Intent intent = getIntent();
        Bundle data = intent.getExtras();
        String label = data.getString("sum");
        int newLatitude = data.getInt("firstNumber");
        int newLongitude = data.getInt("secondNumber");

        MarkerOptions mo = new MarkerOptions().position(new LatLng(newLatitude, newLongitude)).title(label);
        markerList.add(mMap.addMarker(mo));
    }

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

    @Override
    public void onBackPressed(){
        super.onBackPressed();
        SavePreferences();
    }

    private void SavePreferences(){
        SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();

        editor.putInt("listSize", markerList.size());

        for(int i = 0; i <markerList.size(); i++){
            editor.putFloat("lat"+i, (float) markerList.get(0).getPosition().latitude);
            editor.putFloat("long"+i, (float) markerList.get(0).getPosition().longitude);
            editor.putString("title"+i, markerList.get(0).getTitle());
        }

        editor.commit();
    }

    private void LoadPreferences(){
        SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);

        int size = sharedPreferences.getInt("listSize", 0);
        for(int i = 0; i < size; i++){
            double lat = (double) sharedPreferences.getFloat("lat"+i,0);
            double longit = (double) sharedPreferences.getFloat("long"+i,0);
            String title = sharedPreferences.getString("title"+i,"NULL");

            markerList.add(mMap.addMarker(new MarkerOptions().position(new LatLng(lat, longit)).title(title)));
        }
    }
}

My question is how can I store my markers that when I back to maps activity show them? (Using this or another approach)


problem:

markerList.get(0)

You are only saving the first index of your array of markers

solution:

feed the index from the foorloop

markerList.get(i)




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