我是 android 的菜鸟，我正在尝试开发一个基于位置的应用程序。出于某种原因，我无法让 LocationManager 建立我的 Geopoint 以在我的真实位置放置一个图钉。我收到一条错误消息，指出 MapActivity 无法获取连接工厂客户端。我逐字阅读了本教程（http://thenewboston.org/watch.php?cat=6&number=144），所以我不明白为什么它不起作用。此外，如果有人能指出任何实施 google Places api 以查找附近机构并在 mapview 上绘制这些位置的示例项目，我将不胜感激。提前感谢您的帮助！
主要Java
public class FindDealer extends MapActivity implements LocationListener {
MapView finddealer;
long start;
long stop;
MyLocationOverlay compass;
MapController controller;
int x, y;
GeoPoint touchedPoint;
Drawable delta;
List<Overlay> overlayList;
LocationManager lm;
String towers;
int lat;
int lon;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.finddealer);
finddealer = (MapView) findViewById(R.id.mvFindDealer);
finddealer.setBuiltInZoomControls(true);
Touchy tango = new Touchy();
overlayList = finddealer.getOverlays();
overlayList.add(tango);
compass = new MyLocationOverlay(FindDealer.this, finddealer);
overlayList.add(compass);
controller = finddealer.getController();
GeoPoint point = new GeoPoint(51643234, 7848593);//<--Germany
controller.animateTo(point);
controller.setZoom(6);
delta = getResources().getDrawable(R.drawable.ic_launcher);
//placing pinpoint at location
lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria crit = new Criteria();
towers = lm.getBestProvider(crit, false);
Location location = lm.getLastKnownLocation(towers);
if(location != null){
lat = (int) (location.getLatitude()*1E6);
lon = (int) (location.getLongitude()*1E6);
GeoPoint ourLocation = new GeoPoint(lat, lon);
OverlayItem oscar = new OverlayItem(ourLocation, "What's Up", "Homie");
CustomPinPoint custom = new CustomPinPoint(delta, FindDealer.this);
custom.InsertPinpoint(oscar);
overlayList.add(custom);
}else{
Toast.makeText(FindDealer.this, "Couldn't get provider", Toast.LENGTH_SHORT).show();
}
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
compass.disableCompass();
super.onPause();
lm.removeUpdates(this);
finish();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
compass.disableCompass();
super.onResume();
lm.requestLocationUpdates(towers, 500, 1, this);
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
class Touchy extends Overlay{
public boolean onTouchEvent(MotionEvent echo, MapView mike){
if(echo.getAction()==MotionEvent.ACTION_DOWN){
start=echo.getEventTime();
x = (int) echo.getX();
y = (int) echo.getY();
touchedPoint = finddealer.getProjection().fromPixels(x, y);
}
if(echo.getAction()==MotionEvent.ACTION_UP){
stop=echo.getEventTime();
}
if(start - start > 3000){
AlertDialog alert = new AlertDialog.Builder(FindDealer.this).create();
alert.setTitle("Pick");
alert.setMessage("pick again");
alert.setButton("Place pin", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
OverlayItem oscar = new OverlayItem(touchedPoint, "What's Up", "Homie");
CustomPinPoint custom = new CustomPinPoint(delta, FindDealer.this);
custom.InsertPinpoint(oscar);
overlayList.add(custom);
}
});
alert.setButton2("Get Address", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Geocoder geocoder = new Geocoder(getBaseContext(), Locale.getDefault());
try{
List<Address> address = geocoder.getFromLocation(touchedPoint.getLatitudeE6() / 1E6 , touchedPoint.getLongitudeE6() / 1E6, 1);
if (address.size() > 0){
String display = "";
for (int i = 0; i < address.get(0).getMaxAddressLineIndex(); i++ ){
display += address.get(0).getAddressLine(i) + "\n";
}
Toast zulu = Toast.makeText(getBaseContext(), display, Toast.LENGTH_LONG);
zulu.show();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
}
}
});
alert.setButton3("Toggle View", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
if (finddealer.isSatellite()){
finddealer.setSatellite(false);
finddealer.setStreetView(true);
}else{
finddealer.setSatellite(true);
finddealer.setStreetView(false);
}
}
});
alert.show();
return true;
}
return false;
}
}
@Override
public void onLocationChanged(Location l) {
// TODO Auto-generated method stub
lat = (int) (l.getLatitude()* 1E6);
lon = (int) (l.getLongitude()* 1E6);
GeoPoint ourLocation = new GeoPoint(lat, lon);
OverlayItem oscar = new OverlayItem(ourLocation, "What's Up", "Homie");
CustomPinPoint custom = new CustomPinPoint(delta, FindDealer.this);
custom.InsertPinpoint(oscar);
overlayList.add(custom);
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
Toast.makeText(FindDealer.this, "StatusChanged" +provider, Toast.LENGTH_SHORT).show();
}
//Google Places API
public class StoresNearMe {
private String result = "";
private String googleAPIKey = "AIzaSyBXMthQXq878M8RFYvi2rCA8qQTBcFX1i4";
private String searchRadius = "50";
private Location myLocation;
final String TAG = getClass().getSimpleName();
public StoresNearMe(Location location){
myLocation = location;
}//StoresNearMe
public String getStoresNearMe(){
String result = "Nothing";
result = callGoogleWebService(buildURLForGooglePlaces(myLocation));
convertJSONtoArray(result);
return result;
}//getStoresNearMe
private String callGoogleWebService(String url){
HttpClient httpclient = new DefaultHttpClient();
HttpGet request = new HttpGet(url);
//request.addHeader("deviceId", deviceId);
ResponseHandler<String> handler = new BasicResponseHandler();
try {
result = httpclient.execute(request, handler);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
httpclient.getConnectionManager().shutdown();
return result;
}//callWebService
private String buildURLForGooglePlaces(Location location){
String baseUrl = "https://maps.googleapis.com/maps/api/place/search/json?";
String lat = String.valueOf(location.getLatitude());
String lon = String.valueOf(location.getLongitude());
//String type= "establishment|jewelry_store|store";
String keyword= "coin|numismatic|coins|numismatics";
String url = baseUrl + "location=" + lat + "," + lon + "&" +
"radius=" + searchRadius + "keyword" + keyword + "sensor=false" +
"&" + "key=" + googleAPIKey;
Log.d(TAG,url);
return url;`enter code here`
}//buildURLForGooglePlaces
private void convertJSONtoArray(String rawJSON){
try {
JSONObject completeJSONObj = new JSONObject(rawJSON);
String json = completeJSONObj.toString();
Log.d(TAG,json);
JSONArray results = completeJSONObj.getJSONArray("results");
} catch (JSONException e) {
Log.d(TAG,"JSON parsing error - fix it:" + e.getMessage());
}
}//convertJSONtoArray
}//StoresNearMe
}
自定义PinPoint Java
public class CustomPinPoint extends ItemizedOverlay<OverlayItem> {
private ArrayList<OverlayItem> pinpoints = new ArrayList<OverlayItem>();
private Context charlie;
public CustomPinPoint(Drawable defaultMarker) {
super(boundCenter(defaultMarker));
// TODO Auto-generated constructor stub
}
public CustomPinPoint(Drawable mike, Context context) {
// TODO Auto-generated constructor stub
this(mike);
charlie = context;
}
@Override
protected OverlayItem createItem(int i) {
// TODO Auto-generated method stub
return pinpoints.get(i);
}
@Override
public int size() {
// TODO Auto-generated method stub
return pinpoints.size();
}
public void InsertPinpoint(OverlayItem india){
pinpoints.add(india);
this.populate();
}
}
XML 布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<com.google.android.maps.MapView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:apiKey="My key Redacted"
android:id="@+id/mvFindDealer"
android:enabled="true"
android:clickable="true"
/>
</LinearLayout>