我使用devloper.android.com中的google代码 我使用该应用程序，但在模拟器中它只显示交叉线而不是地图 那么在模拟器中是否有用于显示地图的设置 HelloItemizedOverlay.java
package com.HelloGoogleMaps;
import java.util.ArrayList;
import android.app.AlertDialog;
import android.content.Context;
import android.graphics.drawable.Drawable;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.OverlayItem;
public class HelloItemizedOverlay extends ItemizedOverlay {
ArrayList<OverlayItem> mOverlays;
Context mContext;
public HelloItemizedOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
mOverlays = new ArrayList<OverlayItem>();
// TODO Auto-generated constructor stub
}
public HelloItemizedOverlay(Drawable defaultMarker, Context context) {
super(defaultMarker);
mContext = context;
}
@Override
protected OverlayItem createItem(int i) {
// TODO Auto-generated method stub
return mOverlays.get(i);
}
@Override
public int size() {
// TODO Auto-generated method stub
return mOverlays.size();
}
public void addOverlay(OverlayItem overlay) {
mOverlays.add(overlay);
populate();
}
@Override
protected boolean onTap(int index) {
OverlayItem item = mOverlays.get(index);
AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
dialog.setTitle(item.getTitle());
dialog.setMessage(item.getSnippet());
dialog.show();
return true;
}
}
HelloGoogleMaps.java
package com.HelloGoogleMaps;
import java.util.List;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;
import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
public class HelloGoogleMaps extends MapActivity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
MapView mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.androidmarker);
HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(drawable);
GeoPoint point = new GeoPoint(19240000,-99120000);
OverlayItem overlayitem = new OverlayItem(point, "Hola, Mundo!",
"I'm in Mexico City!");
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
}
@Override
protected boolean isRouteDisplayed() {
return false;
}
}
Android Manifest.xml
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".HelloGoogleMaps"
android:label="@string/app_name"
android:theme="@android:style/Theme.NoTitleBar">>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<uses-library android:name="com.google.android.maps" android:required="true"></uses-library>
答案 0 :(得分：1)
您是否在{x} android:apiKey的{{1}}中添加了MapView个属性？如果没有，layout是如何获取APIKey以供您使用MapView。
答案 1 :(得分：0)
根据this tutorial on "Using Google Maps in Android"：
如果您的应用程序设法加载但您看不到地图（您看到的只是一个网格），那么您很可能没有有效的Map键，或者您没有指定INTERNET权限[在您的清单]：
<uses-permission android:name="android.permission.INTERNET" />
答案 2 :(得分：0)
您是否在代理网络内？ 如果是，如果您使用的是Android 2.1仿真器，可能会出现这样的问题吗？
答案 3 :(得分：0)
您是否使用Goole API版本8开发了您的应用程序？ 如果是这样意味着使用google api（版本8）来运行你的应用程序。
我之前也遇到过同样的问题。现在我在我的模拟器上得到了地图。
希望这会有所帮助...
答案 4 :(得分：0)
MAin.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<com.google.android.maps.MapView
android:id="@+id/mapview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:apiKey="0xkjqDikoo8j6Bks9CX7-P1FBT7fNUWC6uQkyyQ"
android:clickable="true" />
</LinearLayout>
` `-------------------------------------------------------------------------
MainActivity Java Class
package com.example.mapsample;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.OverlayItem;
import android.content.Context;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
public class MainActivity extends MapActivity implements LocationListener {
private LocationManager locManager;
private MyItemizedOverlay itemizedOverlay;
private MapView mapView;
private MapController controller;
private double lat;
private double lon;
private double getlat;
private double getlon;
private double[] getlatarr;
private double[] getlonarr;
private GeoPoint point;
private Intent getintent;
OverlayItem overlayItem;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Bundle extras = getIntent().getExtras();
// getlat = getintent.getDoubleExtra("latval", 1);
// getlon = getintent.getDoubleExtra("lonval", 1);
getlatarr = extras.getDoubleArray("latval");
getlonarr = extras.getDoubleArray("lonval");
Log.i("getlatarr", "getlatarr " + getlatarr[0]);
// fetch the map view from the layout
mapView = (MapView) findViewById(R.id.mapview);
// make available zoom controls
mapView.setBuiltInZoomControls(true);
// SetGeoPoints(getlat,getlon);
SetGeoPoints(getlatarr, getlonarr);
}
// public void SetGeoPoints(double nlat,double nlon) {
public void SetGeoPoints(double[] nlat, double[] nlon) {
// TODO Auto-generated method stub
Log.i("nlat", "nlat " + nlat.length);
Log.i("nlon", "nlon " + nlon.length);
// latitude and longitude of Rome ***************for single
// pin*************
// lat = nlat;//41.889882;
// lon = nlon;//12.479267;
// ***************for multiple pin*************
Drawable drawable = this.getResources().getDrawable(R.drawable.map_pin);
itemizedOverlay = new MyItemizedOverlay(drawable, this);
for (int i = 0; i < nlat.length; i++) {
lat = nlat[i];// 41.889882;
lon = nlon[i];// 12.479267;
// create geo point
point = new GeoPoint((int) (lat * 1E6), (int) (lon * 1E6));
// get the MapController object
controller = mapView.getController();
// animate to the desired point
// controller.animateTo(point);
// set the map zoom to 13
// zoom 1 is top world view
controller.setZoom(13);
// fetch the drawable - the pin that will be displayed on the map
// create and add an OverlayItem to the MyItemizedOverlay list
overlayItem = new OverlayItem(point, "", "");
itemizedOverlay.addOverlay(overlayItem);
// add the overlays to the map
mapView.getOverlays().add(itemizedOverlay);
}
mapView.invalidate();
/*
* // Use the location manager through GPS locManager =
* (LocationManager) getSystemService(Context.LOCATION_SERVICE);
* locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
* this);
*
* //get the current location (last known location) from the location
* manager Location location = locManager
* .getLastKnownLocation(LocationManager.GPS_PROVIDER);
*
*
* //if location found display as a toast the current latitude and
* longitude if (location != null) {
*
* Toast.makeText( this, "Current location:\nLatitude: " +
* location.getLatitude() + "\n" + "Longitude: " +
* location.getLongitude(), Toast.LENGTH_LONG).show();
*
* point = new
* GeoPoint((int)(location.getLatitude()*1E6),(int)(location.
* getLongitude() *1E6));
*
* Log.i("point", "point "+point); controller.animateTo(point); } else {
*
* Toast.makeText(this, "Cannot fetch current location!",
* Toast.LENGTH_LONG).show(); }
*
*
*
* //when the current location is found – stop listening for updates
* (preserves battery) locManager.removeUpdates(this);
*/
}
@Override
protected boolean isRouteDisplayed() {
return false;
}
/* When the activity starts up, request updates */
@Override
protected void onResume() {
super.onResume();
// locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,0,
// this);
}
@Override
protected void onPause() {
super.onPause();
// locManager.removeUpdates(this); //activity pauses => stop listening
// for updates
}
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
------------------------------------------------
MapPoints class
package com.example.mapsample;
import java.util.ArrayList;
import java.util.HashMap;
import com.google.android.maps.MapActivity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MapPoints extends Activity implements OnClickListener{
private Button showmapbtn;
// ArrayList<Double> latlist = new ArrayList<Double>();//{41.889882,30.889882,39.889882,42.889882,43.889882};
// ArrayList<Double> longlist = new ArrayList<Double>();//{12.479267,13.479267,14.479267,11.479267,10.479267};;
double[] latlist = {41.889882,41.889862,41.689882,41.889882,41.589882};
double[] longlist = {12.479267,12.479267,12.379267,12.579267,12.979267};;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// latlist.add(41.889882);
// latlist.add(39.889882);
// latlist.add(48.889882);
// latlist.add(30.889882);
//
// latlist.add(12.479267);
// latlist.add(11.889882);
// latlist.add(10.889882);
// latlist.add(15.479267);
showmapbtn = (Button)findViewById(R.id.btnshowmap);
showmapbtn.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.btnshowmap:
Intent mapintent = new Intent(getApplicationContext(),MainActivity.class);
// mapintent.putExtra("latval", 41.889882);
// mapintent.putExtra("lonval", 12.479267);
mapintent.putExtra("latval", latlist);
mapintent.putExtra("lonval", longlist);
// mapintent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(mapintent);
break;
default:
break;
}
}
}
----------------------------------------------------------
MyItemizedOverlay java class
package com.example.mapsample;
import java.util.ArrayList;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.view.MotionEvent;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapView;
import com.google.android.maps.OverlayItem;
public class MyItemizedOverlay extends ItemizedOverlay<OverlayItem> {
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
public MyItemizedOverlay(Drawable defaultMarker, Context ctx) {
super(boundCenterBottom(defaultMarker));
}
public void addOverlay(OverlayItem overlay) {
mOverlays.add(overlay);
populate();
}
public void clear() {
mOverlays.clear();
populate();
}
@Override
protected OverlayItem createItem(int i) {
return mOverlays.get(i);
}
@Override
public int size() {
return mOverlays.size();
}
@Override
protected boolean onTap(int index) {
return true;
}
@Override
public boolean onTouchEvent(MotionEvent event, MapView mapView) {
return false;
}
@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
if (!shadow) {
super.draw(canvas, mapView, false);
}
}
}