【发布时间】：2020-11-19 20:15:53
【问题描述】：
我无法在共享首选项中保存或检索数据。我有多项活动。 我不确定我哪里出错了。 当我运行该应用程序时，它工作正常，只是数据没有按照我的意愿永久存储。
package com.obhan.weather;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,GoogleMap.OnMapLongClickListener {
private GoogleMap mMap;
LocationManager locationManager;
LocationListener locationListener;
public void centerMapOnLocation(Location location, String title) {
LatLng userLocation = new LatLng(location.getLatitude(), location.getLongitude());
// mMap.clear();
if(title != "Your Location"){
mMap.addMarker(new MarkerOptions().position(userLocation).title(title));
}
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(userLocation, 10));
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(grantResults.length > 0 && grantResults[0]==PackageManager.PERMISSION_GRANTED){
if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)== PackageManager.PERMISSION_GRANTED){
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,locationListener);
Location lastKnownLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
centerMapOnLocation(lastKnownLocation,"Your Location");
}
}
}
@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);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.clear();
mMap.setOnMapLongClickListener((GoogleMap.OnMapLongClickListener) this);
Intent intent = getIntent();
if (intent.getIntExtra("PlaceNumber", 0) == 0) {
//zoom in to users location
locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
centerMapOnLocation(location, "Your Location");
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
};
if (Build.VERSION.SDK_INT < 23) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}else
{
if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)!=PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION},1);
}else{
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,locationListener);
Location lastKnownLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
centerMapOnLocation(lastKnownLocation,"Your Location");
}
}
}
else{
Location placelocation = new Location(LocationManager.GPS_PROVIDER);
placelocation.setLatitude(MemorablePlaces.locations.get(intent.getIntExtra("PlaceNumber",0)).latitude);
placelocation.setLongitude(MemorablePlaces.locations.get(intent.getIntExtra("PlaceNumber",0)).longitude);
centerMapOnLocation(placelocation,MemorablePlaces.places.get(intent.getIntExtra("PlaceNumber",0)));
//mMap.addMarker(new MarkerOptions().position(MainActivity.locations.get(intent.getIntExtra("placeNumber",0))).title(MainActivity.places.get(intent.getIntExtra("placeNumber",0))));
}
// Toast.makeText(this, intent.getStringExtra("PlaceNumber"), Toast.LENGTH_SHORT).show();
// Add a marker in Sydney and move the camera
/* LatLng sydney = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));*/
}
@Override
public void onMapLongClick(LatLng latLng) {
Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
String address="";
try {
List<Address> listAddress =geocoder.getFromLocation(latLng.latitude,latLng.longitude,1);
if(listAddress!=null && listAddress.size()>0){
if(listAddress.get(0).getThoroughfare()!=null){
Log.i("Address",listAddress.get(0).toString());
address += listAddress.get(0).getThoroughfare();
// address = "";
Log.i("SubThrough", listAddress.get(0).getThoroughfare());
}
if(listAddress.get(0).getSubThoroughfare()!=null){
address +=listAddress.get(0).getSubThoroughfare();
}
// address +=listAddress.get(0).getThoroughfare();
// Log.i("Through",address);
}
} catch (IOException e) {
e.printStackTrace();
}
if(address==""){
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm yyyy-MM-dd");
address = sdf.format(new Date());
}
/* if(address=="Unnamed Road"){
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm yyyy-MM-dd");
address = sdf.format(new Date());
}*/
mMap.addMarker(new MarkerOptions().position(latLng).title(address));
MemorablePlaces.places.add(address);
MemorablePlaces.locations.add(latLng);
MemorablePlaces.arrayAdapter.notifyDataSetChanged();
SharedPreferences sharedPreferences = getApplicationContext().getSharedPreferences("com.obhan.memorableplaces", Context.MODE_PRIVATE);
try {
ArrayList<String> latitudes = new ArrayList<>();
ArrayList<String > longitudes = new ArrayList<>();
for(LatLng coordinates: MemorablePlaces.locations){
latitudes.add(Double.toString(coordinates.latitude));
longitudes.add(Double.toString(coordinates.longitude));
}
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("places",ObjectSerializer.serialize(MemorablePlaces.places)).apply();
editor.putString("latitudes",ObjectSerializer.serialize(latitudes)).apply();
editor.putString("longitudes",ObjectSerializer.serialize (longitudes)).apply();
editor.commit();
} catch (IOException e) {
e.printStackTrace();
}
Toast.makeText(this, "Location saved", Toast.LENGTH_SHORT).show();
///address="";
}
}
【问题讨论】：
标签： java android maps sharedpreferences