如何將緯度和經度數據傳遞到導航抽屜活動

Question

我在我的recyclerview上獲取空數據，我使用位置選取器傳遞緯度和經度數據，其正常工作在我的MapActivity上。但是，當我嘗試將這些數據保存在我的NavigationDrawer項活動，它越來越空，

這裏是我的MapActivity

public class MapsActivity extends AppCompatActivity implements 
     OnMapReadyCallback, NavigationView.OnNavigationItemSelectedListener, View.OnClickListener { 
     @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_maps); 
     assert getSupportActionBar() != null; 
     getSupportActionBar().setDisplayShowHomeEnabled(true); 

     mMapFragment = (SupportMapFragment) getSupportFragmentManager() 
       .findFragmentById(R.id.map); 
     try { 
      manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
      if (!manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) { 
       Intent myIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); 
       startActivity(myIntent); 
      } else { 
       mMapFragment.getMapAsync(this); 
      } 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     initialize(); 
     setupDrawer(); 
    } 

    private void initialize() { 
     search = (Button) findViewById(R.id.btnSerch); 
     assert search != null; 
     search.setOnClickListener(this); 
    } 

    @Override 
    public void onClick(View v) { 
     if (v.getId() == R.id.btnSerch) { 
      PlacePicker.IntentBuilder builder = new PlacePicker.IntentBuilder(); 
      try { 
       startActivityForResult(builder.build(this), PLACE_PICKER_REQUEST); 
      } catch (GooglePlayServicesRepairableException | GooglePlayServicesNotAvailableException e) { 
       e.printStackTrace(); 
      } 
     } 
    } 

    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (requestCode == PLACE_PICKER_REQUEST) { 
      if (resultCode == RESULT_OK) { 
       Place place = PlacePicker.getPlace(data, this); 

       final Double latitude = place.getLatLng().latitude; 
       final Double longitude = place.getLatLng().longitude; 
       final String placeName = String.valueOf(place.getName()); 
       final float radius = 0.5f; 

       LatLng loc2 = new LatLng(latitude, longitude); 
       marker2 = new MarkerOptions().position(loc2).title(placeName).visible(true); 
       mMap.addMarker(marker2); 
       mMap.moveCamera(CameraUpdateFactory.newLatLng(new LatLng(latitude, longitude))); 
      } 
     } 
    } 

    private void setupDrawer() { 
     try { 
      mDrawer = (NavigationView) findViewById(R.id.mNavDrawer); 
      assert mDrawer != null; 
      mDrawer.setNavigationItemSelectedListener(this); 
      mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
      mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, 
        R.string.DrawerOpen, 
        R.string.DrawerClose); 
      mDrawerLayout.addDrawerListener(mDrawerToggle); 
      mDrawerToggle.syncState(); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 

    @Override 
    public boolean onNavigationItemSelected(MenuItem item) { 
     Intent intent = null; 
     if (item.getItemId() == R.id.navigation_item_1) { 
      mDrawerLayout.closeDrawer(GravityCompat.START); 
      intent = new Intent(MapsActivity.this, LocationList.class); 
      startActivity(intent); 
      return true; 
     } 
     if (item.getItemId() == R.id.navigation_item_2) { 
      mDrawerLayout.closeDrawer(GravityCompat.START); 
      intent = new Intent(this, AboutUs.class); 
      startActivity(intent); 
      return true; 
     } 
     if (item.getItemId() == R.id.navigation_item_3) { 
      mDrawerLayout.closeDrawer(GravityCompat.START); 
      intent = new Intent(this, Help.class); 
      startActivity(intent); 
      return true; 
     } 
     return false; 
    } 

的代碼在我LocationList類我有recycleview和IM試圖設置緯度logtitude數據在上面。我怎麼做。

這裏是我的LocationListActivity

public class LocationList extends AppCompatActivity { 
    private List<Locations> locationsList = new ArrayList<>(); 
    private RecyclerView recyclerView; 
    private LocationAdapter mAdapter; 
    int PLACE_PICKER_REQUEST = 1; 
    String placeName; 
    Double latitude, longitude; 

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

     recyclerView = (RecyclerView) findViewById(R.id.recycler_view); 

     mAdapter = new LocationAdapter(locationsList); 
     RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext()); 
     recyclerView.setLayoutManager(mLayoutManager); 
     recyclerView.setItemAnimator(new DefaultItemAnimator()); 
     recyclerView.setAdapter(mAdapter); 

     prepareLocationData(); 
    } 

    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (requestCode == PLACE_PICKER_REQUEST) { 
      if (resultCode == RESULT_OK) { 
       Place place = PlacePicker.getPlace(data, this); 
       latitude = place.getLatLng().latitude; 
       longitude = place.getLatLng().longitude; 
       placeName = String.valueOf(place.getName()); 
      } 
     } 
    } 

    private void prepareLocationData() { 
     Locations locations = new Locations(placeName, latitude, longitude); 
     locationsList.add(locations); 
     mAdapter.notifyDataSetChanged(); 
    } 
} 

的代碼，當我運行的代碼，它越來越空，我不知道如何來傳遞數據，plz幫助我..這是我的cardview圖像。

Answer 1

您可以將參數添加到您的意圖，並在你的LocationActivity檢索它們。

請參閱以下內容：

設置參數以你的意圖

@Override 
    public boolean onNavigationItemSelected(MenuItem item) { 
     Intent intent = null; 
     if (item.getItemId() == R.id.navigation_item_1) { 
      mDrawerLayout.closeDrawer(GravityCompat.START); 
      intent = new Intent(MapsActivity.this, LocationList.class); 
      intent.putExtra("longitude_key", longitude); 
      intent.putExtra("latitude_key", latitude); 
      startActivity(intent); 
      return true; 
     } 

檢索您的LocationActivity參數

  ... 

Double latitude, longitude; 

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


     if (getIntent() != null) { 
      longitude = getIntent().getDoubleExtra("longitude_key", 0); // set to 0 if not found 
      latitude = getIntent().getDoubleExtra("latitude_key", 0); // set to 0 if not found 
     } 

希望它能幫助。