如何在活动之间传递参数？
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【中文标题】如何在活动之间传递参数？【英文标题】：How to pass arguments between Activities? 【发布时间】：2019-01-07 20:37:06 【问题描述】：我在一个活动中有一个列表项，在另一个活动中有一个 mapView。我想要做的是，当我单击第一个 listItem 时，它会显示当前位置以及我在那里添加的特定位置，在单击其他 listItems 后，它也会显示当前位置，但不同的特定位置将在相同条件下显示.
List<Hero> heroList;
ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_krakow);
heroList = new ArrayList<>();
heroList.add(new Hero(R.drawable.food,"Restaurant", "Justice League"));
heroList.add(new Hero(R.drawable.captainamerica,"Shopping Mall", "Avengers"));
heroList.add(new Hero(R.drawable.doctorstrange,"Hospital", "Avengers"));
heroList.add(new Hero(R.drawable.ironman,"Pharmacy", "Avengers"));
heroList.add(new Hero(R.drawable.joker,"Library", "Injustice League"));
heroList.add(new Hero(R.drawable.spi,"Second Hand", "Avengers"));
listView = (ListView) findViewById(R.id.listview1);
final MyCustomAdapter adapter = new MyCustomAdapter(this,R.layout.list_item,heroList);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id)
Intent pos = new Intent(getApplicationContext(),MapsActivity2.class);
pos.putExtra("asdas",position);
startActivity(pos);
if (position==0)
Intent myIntent = new Intent(view.getContext(),MapsActivity2.class);
startActivityForResult(myIntent,0);
if (position==1)
Intent myIntent = new Intent(view.getContext(),MapsActivity2.class);
startActivityForResult(myIntent,1);
if (position==2)
Intent myIntent = new Intent(view.getContext(),MapsActivity2.class);
startActivityForResult(myIntent,2);
if (position==3)
Intent myIntent = new Intent(view.getContext(),MapsActivity2.class);
startActivityForResult(myIntent,3);
if (position==4)
Intent myIntent = new Intent(view.getContext(),MapsActivity2.class);
startActivityForResult(myIntent,4);
if (position==5)
Intent myIntent = new Intent(view.getContext(),MapsActivity2.class);
startActivityForResult(myIntent,5);
);
这是我的列表视图
GoogleApiClient.ConnectionCallbacks,GoogleApiClient.OnConnectionFailedListener, com.google.android.gms.location.LocationListener
private static final int MY_PERMISSION_CODE = 1000;
private GoogleMap mMap;
private GoogleApiClient mGoogleApiClient;
private double latitude,longitude;
private Location mLastLocation;
private Marker mMarker;
private LocationRequest mLocationRequest;
IGoogleAPIService mService;
private static final LatLng BaniaLuca = new LatLng(50.064146, 19.935940);
private static final LatLng Cocon = new LatLng(50.047654,19.947358);
private Marker mBaniaLuca;
private Marker mCocon;
int asdas ;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps2);
KrakowActivity asd = new KrakowActivity();
Bundle extras = getIntent().getExtras();
if(extras != null)
int asdas = extras.getInt("asdas");
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
mService = Common.getGoogleAPIService();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
checkLocationPermission();
private boolean checkLocationPermission()
if (ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
if (ActivityCompat.shouldShowRequestPermissionRationale(this,Manifest.permission.ACCESS_FINE_LOCATION))
ActivityCompat.requestPermissions(this,new String[]
Manifest.permission.ACCESS_FINE_LOCATION
,MY_PERMISSION_CODE);
else
ActivityCompat.requestPermissions(this,new String[]
Manifest.permission.ACCESS_FINE_LOCATION
,MY_PERMISSION_CODE);
return false;
else
return true;
@Override
public void onMapReady(GoogleMap googleMap)
mMap = googleMap;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED)
buildGoogleApiClien();
mMap.setMyLocationEnabled(true);
else
buildGoogleApiClien();
mMap.setMyLocationEnabled(true);
private synchronized void buildGoogleApiClien()
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
@Override
public void onConnected(@Nullable Bundle bundle)
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED)
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,mLocationRequest,this);
@Override
public void onConnectionSuspended(int i)
mGoogleApiClient.connect();
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult)
@Override
public void onLocationChanged(Location location)
mLastLocation = location;
if (mMarker != null)
mMarker.remove();
latitude = location.getLatitude();
longitude = location.getLongitude();
LatLng latLng = new LatLng(latitude,longitude);
MarkerOptions markerOptions = new MarkerOptions()
.position(latLng)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
mMarker = mMap.addMarker(markerOptions);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng,13));
// if (asdas == 0)
mBaniaLuca = mMap.addMarker(new MarkerOptions()
.position(BaniaLuca)
.title("BaniaLuca"));
mBaniaLuca.setTag(0);
mCocon = mMap.addMarker(new MarkerOptions()
.position(Cocon)
.title("Cocon"));
mCocon.setTag(0);
// else if (asdas == 1)
/* mBaniaLuca = mMap.addMarker(new MarkerOptions()
.position(BaniaLuca)
.title("asdsad"));
mBaniaLuca.setTag(0);
mCocon = mMap.addMarker(new MarkerOptions()
.position(Cocon)
.title("asdsadasdas"));
mCocon.setTag(0);*/
/* AlertDialog asd = new AlertDialog.Builder(this).create();
asd.setMessage("asdasdsadas");
asd.show(); */
// else if (asdas == 2)
/* AlertDialog asd = new AlertDialog.Builder(this).create();
asd.setMessage("asdasdsadas");
asd.show(); */
//
if (mGoogleApiClient != null)
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient,this);
这是我的 MapView。基本上，我想将（位置）发送到另一个活动，这样它就会明白它点击并更改了地图方向。在此先感谢您的帮助，我是初学者，请原谅我的错误。
【问题讨论】：
到底是什么问题？这是非常基本的，有 许多 示例通过此 只是谷歌。 我知道这是超级基本的。我想要的是在单击不同的 listItems 后，它们将显示相同的活动，但条件不同。 【参考方案1】：您必须使用 Intent 的 Extra 部分。您可以直接传递您想要的坐标，而不是传递列表索引。它假设坐标是链接到列表项的数据的一部分。
【讨论】：
我明白了，非常感谢先生！！以上是关于如何在活动之间传递参数？的主要内容，如果未能解决你的问题，请参考以下文章