Я пытаюсь создать приложение, которое сохранит места некоторых памятных мест. Я использую SharedPreferences для сохранения местоположений, но он не сохраняется. Всякий раз, когда пользователь долго нажимает на карту, местоположение сохраняется. Приложение работает нормально, но при повторном открытии оно теряет местоположения.
MainActivity:
public class MainActivity extends AppCompatActivity {
TextView textView;
static ArrayList<String> addresses = new ArrayList<String>();
static ArrayList<LatLng> positions = new ArrayList<LatLng>();
static ArrayAdapter<String> arrayAdapter;
ListView listView;
static int count =0;
static int flag =0;
static int pos;
String countString;
public void add(View view) {
flag=0;
Intent intent = new Intent(this,MapsActivity.class);
startActivity(intent);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SharedPreferences sharedPreferences = this.getSharedPreferences(" com.example.memorableplaces",MODE_PRIVATE);
ArrayList<String> latitudes = new ArrayList<>();
ArrayList<String> longitudes = new ArrayList<>();
try {
countString = sharedPreferences.getString("count","0");
} catch (Exception e) {
e.printStackTrace();
}
count = Integer.parseInt(countString);
Log.i("count",countString);
addresses.clear();
positions.clear();
latitudes.clear();
longitudes.clear();
try {
addresses = (ArrayList<String>) ObjectSerializer.deserialize(sharedPreferences.getString("addresses", ObjectSerializer.serialize(new ArrayList<>())));
latitudes = (ArrayList<String>) ObjectSerializer.deserialize(sharedPreferences.getString("lats", ObjectSerializer.serialize(new ArrayList<>())));
longitudes = (ArrayList<String>) ObjectSerializer.deserialize(sharedPreferences.getString("lons", ObjectSerializer.serialize(new ArrayList<>())));
} catch (Exception e) {
e.printStackTrace();
}
Log.i("size",Integer.toString(addresses.size()));
i f(addresses.size() > 0) {
Log.i("ok","ok");
for (int i = 0; i < latitudes.size(); i++) {
positions.add(new LatLng(Double.parseDouble(latitudes.get(i)), Double.parseDouble(longitudes.get(i))));
}
}
textView = findViewById(R.id.textView);
listView = findViewById(R.id.listView);
arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, addresses);
listView.setAdapter(arrayAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
flag=1;
pos = position;
Intent intent = new Intent(getApplicationContext(), MapsActivity.class);
startActivity(intent);
Log.i("check","see");
}
});
}
}
MapsActivity:
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, GoogleMap.OnMapLongClickListener {
private GoogleMap mMap;
LocationManager locationManager;
LocationListener locationListener;
Marker previous,current;
int flag;
int pos;
String countString;
@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);
}
}
}
@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.setOnMapLongClickListener(this);
if(MainActivity.flag==0) {
locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
Log.i("Location", location.toString());
previous.remove();
LatLng position = new LatLng(location.getLatitude(), location.getLongitude());
current = mMap.addMarker(new MarkerOptions().position(position).title("You are here").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(position, 15));
previous = current;
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
};
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);
LatLng position = new LatLng(lastKnownLocation.getLatitude(), lastKnownLocation.getLongitude());
previous = mMap.addMarker(new MarkerOptions().position(position).title("You are here").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(position, 15));
}
}
else
{
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
}
LatLng position = MainActivity.positions.get(MainActivity.pos);
mMap.addMarker(new MarkerOptions().position(position).title(MainActivity.addresses.get(MainActivity.pos)).icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_CYAN)));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(position, 15));
}
}
@Override
public void onMapLongClick(LatLng latLng) {
Geocoder geocoder = new Geocoder(this, Locale.getDefault());
String address = "";
try {
List<Address> listAdddresses = geocoder.getFromLocation(latLng.latitude,latLng.longitude,1);
if (listAdddresses != null && listAdddresses.size() > 0) {
if (listAdddresses.get(0).getThoroughfare() != null) {
if (listAdddresses.get(0).getSubThoroughfare() != null) {
address += listAdddresses.get(0).getSubThoroughfare() + " ";
}
address += listAdddresses.get(0).getThoroughfare();
}
}
} catch (Exception e) {
e.printStackTrace();
}
if (address.equals("")) {
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm yyyy-MM-dd");
address += sdf.format(new Date());
}
Log.i("yes","all good");
mMap.addMarker(new MarkerOptions().position(latLng).title(address).icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_CYAN)));
Log.i("done","good");
addresses.add(address);
positions.add(latLng);
MainActivity.arrayAdapter.notifyDataSetChanged();
SharedPreferences sharedPreferences = this.getSharedPreferences("com.example.memorableplaces", Context.MODE_PRIVATE);
try {
ArrayList<String> latitudes = new ArrayList<>();
ArrayList<String> longitudes = new ArrayList<>();
for (LatLng coord : positions) {
latitudes.add(Double.toString(coord.latitude));
longitudes.add(Double.toString(coord.longitude));
}
sharedPreferences.edit().putString("places", ObjectSerializer.serialize(addresses)).apply();
sharedPreferences.edit().putString("lats", ObjectSerializer.serialize(latitudes)).apply();
sharedPreferences.edit().putString("lons", ObjectSerializer.serialize(longitudes)).apply();
} catch (Exception e) {
e.printStackTrace();
}
}
}
Класс ObjectSerializer:
public class ObjectSerializer {
public static String serialize(Serializable obj) throws IOException {
if (obj == null) return "";
try {
ByteArrayOutputStream serialObj = new ByteArrayOutputStream();
ObjectOutputStream objStream = new ObjectOutputStream(serialObj);
objStream.writeObject(obj);
objStream.close();
return encodeBytes(serialObj.toByteArray());
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static Object deserialize(String str) throws IOException {
if (str == null || str.length() == 0) return null;
try {
ByteArrayInputStream serialObj = new ByteArrayInputStream(decodeBytes(str));
ObjectInputStream objStream = new ObjectInputStream(serialObj);
return objStream.readObject();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static String encodeBytes(byte[] bytes) {
StringBuffer strBuf = new StringBuffer();
for (int i = 0; i < bytes.length; i++) {
strBuf.append((char) (((bytes[i] >> 4) & 0xF) + ((int) 'a')));
strBuf.append((char) (((bytes[i]) & 0xF) + ((int) 'a')));
}
return strBuf.toString();
}
public static byte[] decodeBytes(String str) {
byte[] bytes = new byte[str.length() / 2];
for (int i = 0; i < str.length(); i+=2) {
char c = str.charAt(i);
bytes[i/2] = (byte) ((c - 'a') << 4);
c = str.charAt(i+1);
bytes[i/2] += (c - 'a');
}
return bytes;
}
}