【发布时间】：2018-05-02 19:16:57
【问题描述】：
我有一个实现谷歌地图的活动。当我启动它时，活动会停止几秒钟，直到地图完全加载。 我想使用 ProgressDialog 直到地图未加载，但我无法在后台线程中启动它，因为地图必须在主线程中加载，如 this link 中所述。
如何在不使用 AsyncTask 的情况下完成它？
否则，有没有办法像谷歌地图应用程序一样立即启动活动并以灰色背景显示未加载的地图？
这是onCreate方法的代码：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mappa);
databaseHelper = new MyDatabaseHelper(this);
Bundle b = getIntent().getExtras();
String placeAddress= "";
if(b != null)
placeAddress= b.getString("indirizzo");
setUpMapIfNeeded();
gMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
gMap.setMyLocationEnabled(true);
UiSettings settings = gMap.getUiSettings();
settings.setMyLocationButtonEnabled(true);
LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
String provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
double lat = location.getLatitude();
double lng = location.getLongitude();
position = new LatLng(lat, lng);
if(!placeAddress.equals("")){
Geocoder geocoder = new Geocoder(this, Locale.getDefault());
List<Address> indirizzi = null;
try {
indirizzi = geocoder.getFromLocationName(placeAddress, 1);
} catch (IOException e) {
e.printStackTrace();
}
double latLuogo = indirizzi.get(0).getLatitude();
double lngLuogo = indirizzi.get(0).getLongitude();
LatLng luogo = new LatLng(latLuogo, lngLuogo);
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(luogo)
.zoom(15)
.build();
gMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
else{
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(position)
.zoom(15)
.build();
gMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
LocationListener listener = new LocationListener() {
public void onLocationChanged(Location location){
//makeUseOfNewLocation(location);
}
@Override
public void onProviderDisabled(String arg0) {}
@Override
public void onProviderEnabled(String arg0) {}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
};
locationManager.requestLocationUpdates(provider, 0, 10, listener);
ConnectivityManager connMngr = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo netInfo = connMngr.getActiveNetworkInfo();
if(checkConnection(netInfo) == true ){
loadFromDatabase(); //load markers
gMap.setInfoWindowAdapter(new InfoWindowAdapter(){
@Override
public View getInfoWindow(Marker marker) {
return null;
}
@Override
public View getInfoContents(Marker marker) {
String nome = marker.getTitle();
String indirizzo = marker.getSnippet();
View v = getLayoutInflater().inflate(R.layout.info_window_layout, null);
TextView title = (TextView)v.findViewById(R.id.titleInfoWindow);
title.setText(nome);
TextView snippet = (TextView)v.findViewById(R.id.snippetInfoWindow);
snippet.setText(indirizzo);
ImageView imView = (ImageView)v.findViewById(R.id.info_windowImageView);
impostaImmagine(imView, nome);
return v;
}
});
gMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
@Override
public void onInfoWindowClick(Marker marker) {
final String nome = marker.getTitle();
final String indirizzo = marker.getSnippet();
startLuogoActivity(nome, indirizzo);
}
});
final Geocoder geocoder = new Geocoder(this, Locale.getDefault());
gMap.setOnMapLongClickListener(new GoogleMap.OnMapLongClickListener() {
@Override
public void onMapLongClick(LatLng point) {
List<Address> addresses = null;
if(checkConnection(netInfo) == true){
try {
addresses = geocoder.getFromLocation(point.latitude, point.longitude, 1);
} catch (IOException e) {
e.printStackTrace();
}
if(addresses!=null){
String address = addresses.get(0).getAddressLine(0);
String city = addresses.get(0).getAddressLine(1);
String country = addresses.get(0).getAddressLine(2);
String indirizzo = address + ", " + city + ", " + country;
final Dialog addByClickDialog = onCreateDialogADDByClick(getBaseContext(), indirizzo);
addByClickDialog.show();
Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(50);
}else{
final Dialog nessunaConnessioneDialog = onCreateDialogNessunaConnessione(getBaseContext());
nessunaConnessioneDialog.show();
Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(50);
}
}
else{
final Dialog nessunaConnessioneDialog = onCreateDialogNessunaConnessione(getBaseContext());
nessunaConnessioneDialog.show();
Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(50);
}
}
});
Button addButton = (Button)findViewById(R.id.addButton);
final Dialog addDialog;
if(checkConnection(netInfo) == false){
addDialog = onCreateDialogADD(getBaseContext(), false);
}else{
addDialog = onCreateDialogADD(getBaseContext(), true);
}
addButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
addDialog.show();
}
});
Button deleteButton = (Button)findViewById(R.id.deleteButton);
final Dialog deleteDialog;
if(checkConnection(netInfo) == false){
deleteDialog = onCreateDialogDELETE(getBaseContext(), false);
}else{
deleteDialog = onCreateDialogDELETE(getBaseContext(), true);
}
deleteButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deleteDialog.show();
}
});
}
【问题讨论】：
-
显示代码的主要部分。所以我可以帮助你..
-
你使用的是 MapActivity 还是 MapFragment？
-
为什么需要几秒钟？除非您在主线程上执行其他操作，否则地图加载速度很快。
-
@KunalS.Kushwah 我正在使用 MapFragment
-
@MaciejGórski 我不仅在主线程上加载地图，还从数据库中加载一些标记，设置 infoWindow 布局，一些按钮侦听器和其他东西
标签： android google-maps progressdialog