我是刚接触谷歌地图和谷歌地方api的android。从最近一个月开始搜索。但我不成功。 我正在开发一个应用程序，任何人都可以从他/她的位置找到最近的医院/实验室。 请帮我确定问题所在。我将不胜感激。
这是我的清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.naqvi.myapplication">
<!--
The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
Google Maps Android API v2, but you must specify either coarse or fine
location permissions for the 'MyLocation' functionality.
-->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="in.wptrafficanalyzer.locationgeocodingv2.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="com.javapapers.android.googleplacesdetail.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="@string/google_maps_key" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<!--
The API key for Google Maps-based APIs is defined as a string resource.
(See the file "res/values/google_maps_api.xml").
Note that the API key is linked to the encryption key used to sign the APK.
You need a different API key for each encryption key, including the release key that is used to
sign the APK for publishing.
You can define the keys for the debug and release targets in src/debug/ and src/release/.
-->
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="@string/google_maps_key" />
<activity
android:name=".MapsActivity"
android:label="@string/title_activity_maps">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
这是我的主要MapsActivity
public class MapsActivity extends FragmentActivity implements LocationListener {
private static final String GOOGLE_API_KEY = "AIzaSyAVpSjjJ_1PBMsX1phEyzQ6ExwvW3-5PwM";
GoogleMap googleMap;
double latitude = 0;
double longitude = 0;
EditText placeText;
private int PROXIMITY_RADIUS = 5000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//show error dialog if GoolglePlayServices not available
if (!isGooglePlayServicesAvailable()) {
finish();
}
setContentView(R.layout.activity_maps);
placeText = (EditText) findViewById(R.id.actv_Search);
Button btn_find = (Button) findViewById(R.id.btn_find);
SupportMapFragment fragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
googleMap = fragment.getMap();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, 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);
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(bestProvider);
if (location != null) {
onLocationChanged(location);
}
locationManager.requestLocationUpdates(bestProvider, 20000, 0, this);
btn_find.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String type = placeText.getText().toString();
StringBuilder googlePlacesUrl = new StringBuilder("https://maps.googleapis.com/maps/api/place/nearbysearch/json?");
googlePlacesUrl.append("location=" + latitude + "," + longitude);
googlePlacesUrl.append("&radius=" + PROXIMITY_RADIUS);
googlePlacesUrl.append("&types=" + type);
googlePlacesUrl.append("&sensor=true");
googlePlacesUrl.append("&key=" + GOOGLE_API_KEY);
GooglePlacesReadTask googlePlacesReadTask = new GooglePlacesReadTask();
Object[] toPass = new Object[2];
toPass[0] = googleMap;
toPass[1] = googlePlacesUrl.toString();
googlePlacesReadTask.execute(toPass);
}
});
}
private boolean isGooglePlayServicesAvailable() {
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if (ConnectionResult.SUCCESS == status) {
return true;
} else {
GooglePlayServicesUtil.getErrorDialog(status, this, 0).show();
return false;
}
}
@Override
public void onLocationChanged(Location location) {
latitude = location.getLatitude();
longitude = location.getLongitude();
LatLng latLng = new LatLng(latitude, longitude);
googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
googleMap.animateCamera(CameraUpdateFactory.zoomTo(12));
}
@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
}
}
这是我的GooglePlaceReadTask class
public class GooglePlacesReadTask extends AsyncTask<Object, Integer, String> {
String googlePlacesData = null;
GoogleMap googleMap;
@Override
protected String doInBackground(Object... inputObj) {
try {
googleMap = (GoogleMap) inputObj[0];
String googlePlacesUrl = (String) inputObj[1];
Http http = new Http();
googlePlacesData = http.read(googlePlacesUrl);
} catch (Exception e) {
Log.d("Google Place Read Task", e.toString());
}
return googlePlacesData;
}
@Override
protected void onPostExecute(String result) {
PlacesDisplayTask placesDisplayTask = new PlacesDisplayTask();
Object[] toPass = new Object[2];
toPass[0] = googleMap;
toPass[1] = result;
placesDisplayTask.execute(toPass);
}
}
这是Http类
public class Http {
public String read(String httpUrl) throws IOException {
String httpData = "";
InputStream inputStream = null;
HttpURLConnection httpURLConnection = null;
try {
URL url = new URL(httpUrl);
httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.connect();
inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
StringBuffer stringBuffer = new StringBuffer();
String line = "";
while ((line = bufferedReader.readLine()) != null) {
stringBuffer.append(line);
}
httpData = stringBuffer.toString();
bufferedReader.close();
} catch (Exception e) {
Log.d("Exception - reading Http url", e.toString());
} finally {
inputStream.close();
httpURLConnection.disconnect();
}
return httpData;
}
}
这是Places类
public class Places {
public List<HashMap<String, String>> parse(JSONObject jsonObject) {
JSONArray jsonArray = null;
try {
jsonArray = jsonObject.getJSONArray("results");
} catch (JSONException e) {
e.printStackTrace();
}
return getPlaces(jsonArray);
}
private List<HashMap<String, String>> getPlaces(JSONArray jsonArray) {
int placesCount = jsonArray.length();
List<HashMap<String, String>> placesList = new ArrayList<HashMap<String, String>>();
HashMap<String, String> placeMap = null;
for (int i = 0; i < placesCount; i++) {
try {
placeMap = getPlace((JSONObject) jsonArray.get(i));
placesList.add(placeMap);
} catch (JSONException e) {
e.printStackTrace();
}
}
return placesList;
}
private HashMap<String, String> getPlace(JSONObject googlePlaceJson) {
HashMap<String, String> googlePlaceMap = new HashMap<String, String>();
String placeName = "-NA-";
String vicinity = "-NA-";
String latitude = "";
String longitude = "";
String reference = "";
try {
if (!googlePlaceJson.isNull("name")) {
placeName = googlePlaceJson.getString("name");
}
if (!googlePlaceJson.isNull("vicinity")) {
vicinity = googlePlaceJson.getString("vicinity");
}
latitude = googlePlaceJson.getJSONObject("geometry").getJSONObject("location").getString("lat");
longitude = googlePlaceJson.getJSONObject("geometry").getJSONObject("location").getString("lng");
reference = googlePlaceJson.getString("reference");
googlePlaceMap.put("place_name", placeName);
googlePlaceMap.put("vicinity", vicinity);
googlePlaceMap.put("lat", latitude);
googlePlaceMap.put("lng", longitude);
googlePlaceMap.put("reference", reference);
} catch (JSONException e) {
e.printStackTrace();
}
return googlePlaceMap;
}
}
最后PlacesDisplayTask班
public class PlacesDisplayTask扩展了AsyncTask＆gt;＆gt; {
JSONObject googlePlacesJson;
GoogleMap googleMap;
@Override
protected List<HashMap<String, String>> doInBackground(Object... inputObj) {
List<HashMap<String, String>> googlePlacesList = null;
Places placeJsonParser = new Places();
try {
googleMap = (GoogleMap) inputObj[0];
googlePlacesJson = new JSONObject((String) inputObj[1]);
googlePlacesList = placeJsonParser.parse(googlePlacesJson);
} catch (Exception e) {
Log.d("Exception", e.toString());
}
return googlePlacesList;
}
@Override
protected void onPostExecute(List<HashMap<String, String>> list) {
googleMap.clear();
for (int i = 0; i < list.size(); i++) {
MarkerOptions markerOptions = new MarkerOptions();
HashMap<String, String> googlePlace = list.get(i);
double lat = Double.parseDouble(googlePlace.get("lat"));
double lng = Double.parseDouble(googlePlace.get("lng"));
String placeName = googlePlace.get("place_name");
String vicinity = googlePlace.get("vicinity");
LatLng latLng = new LatLng(lat, lng);
markerOptions.position(latLng);
markerOptions.title(placeName + " : " + vicinity);
googleMap.addMarker(markerOptions);
}
}
}