インテントを使用してCustomAdapterからMapActivityにLatlngを送信する

Question

MapActivityを呼び出すOnItemClickListenerメソッドを持つMainActivityのリストビューがあります。マップアクティビティは、CustomAdapter（JSON）から緯度と経度を取得します。目標は、リスト内の項目の1つをクリックしてMapActivityを開き、CustomAdapterから緯度と経度を取得することです。私の問題は、MapActivityがアイテムをクリックせずに直接起動することです。

public class MainActivity extends Activity{ 
private static final String TAG = MainActivity.class.getSimpleName(); 

// resturants json url 
private static final String url = "http://w99ltestapp.w99l.net/w99ltestapp/webservice/?link=getRest"; 
private ProgressDialog pDialog; 
private List<Resturant> resturantList = new ArrayList<Resturant>(); 
private ListView listView; 
private CustomListAdapter adapter; 



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

    listView = (ListView) findViewById(R.id.list); 
    adapter = new CustomListAdapter(this, resturantList); 
    listView.setAdapter(adapter); 
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 


     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      Intent intent = new Intent(view.getContext(), MapsActivity.class); 
      startActivity(intent); 
     }}); 

CustomAdapter

public class CustomListAdapter extends BaseAdapter { 
    private Activity activity; 
    private LayoutInflater inflater; 
    private List<Resturant> resturantItems; 


    ImageLoader imageLoader = AppController.getInstance().getImageLoader(); 

    public CustomListAdapter(Activity activity, List<Resturant> resturantItems) { 
     this.activity = activity; 
     this.resturantItems = resturantItems; } 

@Override 
public int getCount() { 
    return resturantItems.size(); 
} 

@Override 
public Object getItem(int location) { 
    return resturantItems.get(location); 
} 

@Override 
public long getItemId(int position) { 
    return position; 
} 


@Override 
public View getView(int position, View convertView, ViewGroup parent) { 

    if (inflater == null) 
     inflater = (LayoutInflater) activity 
       .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    if (convertView == null) 
     convertView = inflater.inflate(R.layout.list_row, null); 

    if (imageLoader == null) 
     imageLoader = AppController.getInstance().getImageLoader(); 
    NetworkImageView thumbNail = (NetworkImageView) convertView 
      .findViewById(R.id.image); 
    TextView name = (TextView) convertView.findViewById(R.id.name); 
    TextView lat = (TextView) convertView.findViewById(R.id.lat); 
    TextView lng = (TextView) convertView.findViewById(R.id.lng); 


    // getting resturant data for the row 
    Resturant m = resturantItems.get(position); 

    // thumbnail image 
    thumbNail.setImageUrl(m.getImage(), imageLoader); 

    // name 
    name.setText(m.getName()); 

    // SETTING UP AND SENDING DATA 
    lat.setText("Lat: " + String.valueOf(m.getLat())); 

    lng.setText("Lng: " + String.valueOf(m.getLng())); 

    double latitude = Double.parseDouble(String.valueOf(m.getLat())); 
    double longitude = Double.parseDouble(String.valueOf(m.getLng())); 

    LatLng fromPosition = new LatLng(latitude, longitude); 
    //LatLng toPosition = new LatLng(11.145315551, 99.333455333); 


    Intent intent= new Intent(convertView.getContext(), MapsActivity.class); 

    Bundle args = new Bundle(); 
    args.putParcelable("from_position", fromPosition); 
    //args.putParcelable("to_position", toPosition); 

    intent.putExtra("bundle", args); 

    convertView.getContext().sendBroadcast(intent); 

MapsActivity

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback { 
private LatLng fromPosition= new LatLng(-34,151) ; 
// private LatLng toPosition ; 
private GoogleMap mMap; 

@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); 
    Bundle bundle = getIntent().getParcelableExtra("bundle"); 
    fromPosition = bundle.getParcelable("from_position"); 
    toPosition = bundle.getParcelable("to_position"); 
} 


/** 
* Manipulates the map once available. 
* This callback is triggered when the map is ready to be used. 
* This is where we can add markers or lines, add listeners or move the camera. In this case, 
* we just add a marker near Sydney, Australia. 
* If Google Play services is not installed on the device, the user will be prompted to install 
* it inside the SupportMapFragment. This method will only be triggered once the user has 
* installed Google Play services and returned to the app. 
*/ 
@Override 
public void onMapReady(GoogleMap googleMap) { 
    mMap = googleMap; 

    // Add a marker in Sydney and move the camera 
    LatLng sydney =fromPosition; 
    mMap.addMarker(new MarkerOptions().position(sydney).title("resturant")); 
    mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney)); 
} 

}

Answer 1

このようMapsActivityでデータを取得し、あなたはどこにでもアプリケーション内にアクセスするための静的変数を使用することができます。また、あなたの要件に応じてあなたの意図を調整することができます。

だけで、以下のように

のpublic static緯度経度FromPositionはをFromPositionはを使用します。

Answer 2

を

CustomListAdapterからデータをこのように渡し0

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
someView.setOnClikListener(new OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       final int position = mListView.getPositionForView((View) v.getParent()); 
       Intent intent = new Intent(view.getContext(), MapsActivity.class); 
       Bundle bundle = new Bundle(); 
       //Add your data from getFactualResults method to bundle 
       bundle.putString("from_position", your start point); 
       bundle.putString("to_position", your end point); 
       //Add the bundle to the intent 
       intent.putExtras(bundle); 
       startActivity(intent);)); 
      } 
     }); 
}  

を目的に渡すデータをわざわざなぜ

Bundle bundle = getIntent().getExtras(); 

//Extract the data… 
fromPosition = bundle.getString("from_position"); 
toPosition = bundle.getString("to_position");