我正在使用Android Google地图API创建一个应用程序，可以让我映射街道的辅助功能问题。 我的程序允许用户今天在地图上放置n个标记，搜索特定位置或将标记放在用户当前所在的位置（MyLocation按钮）。 我现在正在搜索如何在Android版Google地图API上创建列表。我们的想法是，当标记（放置在地图上的某个位置）被点击时，将出现一个列表，因此用户将能够选择此列表中的一个选项，并且将存储用户选择的值。选项表示用户找到的可访问性问题。 有没有人已经在这个API的某个地方使用了列表？ 这是我的完整代码：
package com.example.i841838.myapplication; import android.app.Dialog; import android.content.Intent; import android.content.SharedPreferences; import android.content.pm.PackageManager; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.provider.MediaStore; import android.support.v4.app.ActivityCompat; import android.support.v4.app.FragmentActivity; import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult; import com.google.android.gms.common.GooglePlayServicesUtil; import com.google.android.gms.maps.CameraUpdateFactory; import com.google.android.gms.maps.GoogleMap; import com.google.android.gms.maps.GoogleMap.OnMapClickListener; import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener; import com.google.android.gms.maps.SupportMapFragment; import com.google.android.gms.maps.model.LatLng; import com.google.android.gms.maps.model.MarkerOptions;
import java.io.File;
import static com.google.android.gms.common.GooglePlayServicesUtil.isGooglePlayServicesAvailable; import static com.google.android.gms.maps.CameraUpdateFactory.newLatLng;
public class MapsActivity extends FragmentActivity {
GoogleMap googleMap;
SharedPreferences sharedPreferences;
int locationCount = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Getting Google Play availability status
int status = isGooglePlayServicesAvailable(getBaseContext());
// Showing status
if (status != ConnectionResult.SUCCESS) { // Google Play Services are not available
int requestCode = 10;
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
dialog.show();
} else { // Google Play Services are available
// Getting reference to the SupportMapFragment of activity_main.xml
SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
// Getting GoogleMap object from the fragment
googleMap = fm.getMap();
// Enabling MyLocation Layer of Google Map
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.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;
}
googleMap.setMyLocationEnabled(true);
// Opening the sharedPreferences object
sharedPreferences = getSharedPreferences("location", 0);
// Getting number of locations already stored
locationCount = sharedPreferences.getInt("locationCount", 0);
// Getting stored zoom level if exists else return 0
String zoom = sharedPreferences.getString("zoom", "0");
// If locations are already saved
if(locationCount!=0){
String lat = "";
String lng = "";
// Iterating through all the locations stored
for(int i=0;i<locationCount;i++){
// Getting the latitude of the i-th location
lat = sharedPreferences.getString("lat"+i,"0");
// Getting the longitude of the i-th location
lng = sharedPreferences.getString("lng"+i,"0");
// Drawing marker on the map
drawMarker(new LatLng(Double.parseDouble(lat), Double.parseDouble(lng)));
}
// Moving CameraPosition to last clicked position
googleMap.moveCamera(newLatLng(new LatLng(Double.parseDouble(lat), Double.parseDouble(lng))));
// Setting the zoom level in the map on last position is clicked
googleMap.animateCamera(CameraUpdateFactory.zoomTo(Float.parseFloat(zoom)));
}
}
googleMap.setOnMapClickListener(new OnMapClickListener() {
@Override
public void onMapClick(LatLng point) {
locationCount++;
// Drawing marker on the map
drawMarker(point);
/** Opening the editor object to write data to sharedPreferences */
SharedPreferences.Editor editor = sharedPreferences.edit();
// Storing the latitude for the i-th location
editor.putString("lat"+ Integer.toString((locationCount-1)), Double.toString(point.latitude));
// Storing the longitude for the i-th location
editor.putString("lng"+ Integer.toString((locationCount-1)), Double.toString(point.longitude));
// Storing the count of locations or marker count
editor.putInt("locationCount", locationCount);
/** Storing the zoom level to the shared preferences */
editor.putString("zoom", Float.toString(googleMap.getCameraPosition().zoom));
/** Saving the values stored in the shared preferences */
editor.commit();
Toast.makeText(getBaseContext(), "Marcador adicionado ao mapa!!!!", Toast.LENGTH_SHORT).show();
}
});
googleMap.setOnMapLongClickListener(new OnMapLongClickListener() {
@Override
public void onMapLongClick(LatLng point) {
// Removing the marker and circle from the Google Map
googleMap.clear();
// Opening the editor object to delete data from sharedPreferences
SharedPreferences.Editor editor = sharedPreferences.edit();
// Clearing the editor
editor.clear();
// Committing the changes
editor.commit();
// Setting locationCount to zero
locationCount=0;
}
});
}
private void drawMarker(LatLng point){ // Creating an instance of MarkerOptions
MarkerOptions markerOptions = new MarkerOptions();
// Setting latitude and longitude for the marker
markerOptions.position(point);
// Adding marker on the Google Map
googleMap.addMarker(markerOptions);
}
}