我正在构建一个Android应用程序并使用mapActivity。
但问题是，当我运行我的应用程序时，没有显示地图。
这是我的活动代码：
public class MainActivitytut extends FragmentActivity{
GoogleMap map;
private static MapController mMapController;
private static final LatLng GOLDEN_GATE_BRIDGE =
new LatLng(37.828891,-122.485884);
private static final LatLng APPLE =
new LatLng(37.3325004578, -122.03099823);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maintut);
map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
if (map == null) {
Toast.makeText(this, "Google Maps not available",
Toast.LENGTH_LONG).show();
}
}
这是我的xml：
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android">
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
<TextView
android:id="@+id/locinfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="104dp"
android:layout_marginTop="113dp"
android:text="TextView" />
</RelativeLayout>
根据最新的Google Map需要更新问题。
答案 0 :(得分：-1)
以下是您问题的更新代码：
package com.amal.googlemap;
import java.io.IOException;
import java.util.List;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import android.content.Context;
import android.location.Address;
import android.location.Geocoder;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.widget.Toast;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class MainActivitytut extends FragmentActivity{
GoogleMap googleMap;
MarkerOptions markerOptions;
LatLng latLng;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maintut);
SupportMapFragment supportMapFragment = (SupportMapFragment)
getSupportFragmentManager().findFragmentById(R.id.map);
// Getting a reference to the map
googleMap = supportMapFragment.getMap();
// Setting a click event handler for the map
googleMap.setOnMapClickListener(new OnMapClickListener() {
@Override
public void onMapClick(LatLng arg0) {
// Getting the Latitude and Longitude of the touched location
latLng = arg0;
String lat = latLng.toString();
Toast.makeText(getApplicationContext(), lat,
Toast.LENGTH_LONG).show();
// Clears the previously touched position
googleMap.clear();
// Animating to the touched position
googleMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));
// Creating a marker
markerOptions = new MarkerOptions();
// Setting the position for the marker
markerOptions.position(latLng);
// Placing a marker on the touched position
googleMap.addMarker(markerOptions);
// Adding Marker on the touched location with address
new ReverseGeocodingTask(getBaseContext()).execute(latLng);
}
});
// map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
// if (map == null) {
// Toast.makeText(this, "Google Maps not available",
// Toast.LENGTH_LONG).show();
//
// }
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is
// present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
// @Override
// public boolean onOptionsItemSelected(MenuItem item) {
//
// switch (item.getItemId()) {
//
// case R.id.menu_sethybrid:
// map.setMapType(GoogleMap.MAP_TYPE_HYBRID);
// break;
//
// case R.id.menu_showtraffic:
// map.setTrafficEnabled(true);
// break;
//
// case R.id.menu_zoomin:
// map.animateCamera(CameraUpdateFactory.zoomIn());
// break;
//
// case R.id.menu_zoomout:
// map.animateCamera(CameraUpdateFactory.zoomOut());
// break;
//
// case R.id.menu_gotolocation:
// CameraPosition cameraPosition = new CameraPosition.Builder()
// .target(GOLDEN_GATE_BRIDGE) // Sets the center of the map to
// // Golden Gate Bridge
// .zoom(17) // Sets the zoom
// .bearing(90) // Sets the orientation of the camera to east
// .tilt(30) // Sets the tilt of the camera to 30 degrees
// .build(); // Creates a CameraPosition from the builder
// map.animateCamera(CameraUpdateFactory.newCameraPosition(
// cameraPosition));
// break;
//
// case R.id.menu_addmarker:
// // ---using the default marker---
// /*
// map.addMarker(new MarkerOptions()
// .position(GOLDEN_GATE_BRIDGE)
// .title("Golden Gate Bridge") .snippet("San Francisco")
// .icon(BitmapDescriptorFactory
// .defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));
// */
//
// map.addMarker(new MarkerOptions()
// .position(GOLDEN_GATE_BRIDGE)
// .title("Golden Gate Bridge")
// .snippet("San Francisco")
// .icon(BitmapDescriptorFactory
// .fromResource(R.drawable.ic_launcher)));
// break;
//
// case R.id.menu_getcurrentlocation:
// // ---get your current location and display a blue dot---
// map.setMyLocationEnabled(true);
//
// break;
//
// case R.id.menu_showcurrentlocation:
// Location myLocation = map.getMyLocation();
// LatLng myLatLng = new LatLng(myLocation.getLatitude(),
// myLocation.getLongitude());
//
// CameraPosition myPosition = new CameraPosition.Builder()
// .target(myLatLng).zoom(17).bearing(90).tilt(30).build();
// map.animateCamera(
// CameraUpdateFactory.newCameraPosition(myPosition));
// break;
//
// case R.id.menu_lineconnecttwopoints:
// //---add a marker at Apple---
// map.addMarker(new MarkerOptions()
// .position(APPLE)
// .title("Apple")
// .snippet("Cupertino")
// .icon(BitmapDescriptorFactory.defaultMarker(
// BitmapDescriptorFactory.HUE_AZURE)));
//
// //---draw a line connecting Apple and Golden Gate Bridge---
// map.addPolyline(new PolylineOptions()
// .add(GOLDEN_GATE_BRIDGE, APPLE).width(5).color(Color.RED));
// break;
// }
// return true;
// }
private class ReverseGeocodingTask extends AsyncTask<LatLng, Void, String>{
Context mContext;
public ReverseGeocodingTask(Context context){
super();
mContext = context;
}
// Finding address using reverse geocoding
@Override
protected String doInBackground(LatLng... params) {
Geocoder geocoder = new Geocoder(mContext);
double latitude = params[0].latitude;
double longitude = params[0].longitude;
List<Address> addresses = null;
String addressText="";
try {
addresses = geocoder.getFromLocation(latitude, longitude,1);
} catch (IOException e) {
e.printStackTrace();
}
if(addresses != null && addresses.size() > 0 ){
Address address = addresses.get(0);
addressText = String.format("%s, %s, %s",
address.getMaxAddressLineIndex() > 0 ? address.getAddressLine(0) : "",
address.getLocality(),
address.getCountryName());
}
return addressText;
}
@Override
protected void onPostExecute(String addressText) {
// Setting the title for the marker.
// This will be displayed on taping the marker
markerOptions.title(addressText);
// Placing a marker on the touched position
googleMap.addMarker(markerOptions);
}
}
}
答案 1 :(得分：-1)