大佬教程收集整理的这篇文章主要介绍了使用 Google Maps API 从当前位置获取附近地点的结果，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
这是我的代码：
public class MapsActivity extends AppCompatActivity implements OnMapReadyCallBACk,LOCATIOnListener,Googleapiclient.ConnectionCallBACks,Googleapiclient.onConnectionFailedListener {
GoogleMap mMap;
SupportMapFragment mapFragment;
LOCATIOnrequest mLOCATIOnrequest;
Googleapiclient clIEnt;
LOCATIOn mLastLOCATIOn;
Marker mCurrLOCATIOnMarker;
LatLng latLongCurrent;
@OverrIDe
protected voID onCreate(Bundle savedInstanceStatE) {
super.onCreate(savedInstanceStatE);
setContentVIEw(R.layout.activity_map);
getSupportActionbar().settitle("Map LOCATIOn");
// Obtain the SupportMapFragment and get notifIEd when the map is ready to be used.
mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentByID(R.ID.map);
mapFragment.getMapAsync(this);
}
public voID findRestaurant(View view) {
StringBuilder StringBuilder = new StringBuilder("https://maps.GoogleAPIs.com/maps/API/place/nearbysearch/Json?");
StringBuilder.append("LOCATIOn=" + latLongCurrent.latitude + "," + latLongCurrent.longitudE); //error attempt to read from fIEld 'double...on a null object reference
StringBuilder.append("&radius=" + 1000);
StringBuilder.append("&keyword=" + "restaurant");
StringBuilder.append("&key=" + getresources().getString(R.String.Google_places_key));
String url = StringBuilder.toString();
Object dataTransfer[] = new Object[2];
dataTransfer[0] = mMap;
dataTransfer[1] = url;
NearbySearch nearbySearch = new NearbySearch(this);
nearbySearch.execute(dataTransfer);
}
@OverrIDe
public voID onPause() {
super.onPause();
//stop LOCATIOn updates when Activity is no longer active
if (clIEnt != null) {
LOCATIOnservices.FusedLOCATIOnAPI.removeLOCATIOnupdates(clIEnt,this);
}
}
@OverrIDe
public Boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.map_options,menu);
return true;
}
@OverrIDe
public voID onMapReady(GoogleMap GoogleMap) {
mMap = GoogleMap;
//Initializing the Google Play services
if (androID.os.build.VERSION.SDK_INT >= Build.VERSION_CODEs.M) {
if (ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
//LOCATIOn Permission already granted
buildGoogleapiclient();
mMap.setMyLOCATIOnEnabled(true);
} else {
//request LOCATIOn Permission
checkLOCATIOnPermission();
}
} else {
buildGoogleapiclient();
mMap.setMyLOCATIOnEnabled(true);
}
}
protected synchronized voID buildGoogleapiclient() {
clIEnt = new Googleapiclient.builder(this)
.addConnectionCallBACks(this)
.addOnConnectionFailedListener(this)
.addAPI(LOCATIOnservices.API)
.build();
clIEnt.connect();
}
@OverrIDe
public voID onConnected(Bundle bundlE) {
mLOCATIOnrequest = new LOCATIOnrequest();
mLOCATIOnrequest.seTinterval(1000);
mLOCATIOnrequest.setFastesTinterval(1000);
mLOCATIOnrequest.setPriority(LOCATIOnrequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LOCATIOnservices.FusedLOCATIOnAPI.requestLOCATIOnupdates(clIEnt,mLOCATIOnrequest,this);
}
}
@OverrIDe
public Boolean onoptionsItemSELEcted(MenuItem item) {
// Change the map type based on the user's SELEction.
switch (item.getItemID()) {
case R.ID.normal_map:
mMap.setMapType(GoogleMap.MAP_TYPE_norMAL);
return true;
case R.ID.hybrID_map:
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
return true;
case R.ID.satellite_map:
mMap.setMapType(GoogleMap.MAP_TYPE_SATELliTE);
return true;
case R.ID.terrain_map:
mMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
return true;
default:
return super.onoptionsItemSELEcted(item);
}
}
@OverrIDe
public voID onLOCATIOnChanged(LOCATIOn LOCATIOn) {
mLastLOCATIOn = LOCATIOn;
if (mCurrLOCATIOnMarker != null) {
mCurrLOCATIOnMarker.remove();
}
//Place current LOCATIOn marker
LatLng latLng = new LatLng(LOCATIOn.getLatitude(),LOCATIOn.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("My current position");
mCurrLOCATIOnMarker = mMap.addMarker(markerOptions);
}
public static final int MY_PERMISSIONS_requEST_LOCATION = 99;
private voID checkLOCATIOnPermission() {
if (ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowrequestPermissionRationale(this,Manifest.permission.ACCESS_FINE_LOCATION)) {
new AlertDialog.builder(MapsActivity.this)
.settitle("LOCATIOn Permission Needed")
.setmessage("This app needs the LOCATIOn permission,please accept this to use the LOCATIOn functionality")
.setPositivebutton("OK",new DialogInterface.onClickListener() {
@OverrIDe
public voID onClick(DialogInterface dialogInterface,int i) {
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(MapsActivity.this,new String[]{Manifest.permission.ACCESS_FINE_LOCATION},MY_PERMISSIONS_requEST_LOCATION);
}
}).create().show();
} else {
// No explanation needed,we can request the permission.
ActivityCompat.requestPermissions(this,MY_PERMISSIONS_requEST_LOCATION);
}
}
}
@OverrIDe
public voID onrequestPermissionsResult(int requestCode,String permissions[],int[] grantResults) {
super.onrequestPermissionsResult(requestCode,permissions,grantResults);
switch (requestCodE) {
case MY_PERMISSIONS_requEST_LOCATION: {
// If request is cancelled,the result arrays are empty.
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
if (clIEnt == null) {
buildGoogleapiclient();
}
mMap.setMyLOCATIOnEnabled(true);
}
} else {
Toast.makeText(this,"Permission is denIEd",Toast.LENGTH_LONG).show();
}
return;
}
}
}
private voID moveCamera(LatLng latLang,float zoom,String titlE) {
mMap.moveCamera(CameraupdateFactory.newLatLngZoom(latLang,zoom));
//wriTing the code to drop the pin or marker
MarkerOptions options = new MarkerOptions().position(latLang).title(titlE);
mMap.addMarker(options);
}
@OverrIDe
public voID onConnectionSuspended(int i) {
}
@OverrIDe
public voID onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
}
这是我的类 NearbySearch.java 代码如下：
public class NearbySearch extends AsyncTask<Object,String,String> {
GoogleMap mMap;
String url;
inputStream is;
BufferedReader bufferedReader;
StringBuilder StringBuilder;
String data;
public NearbySearch(MapsActivity mapsActivity) {
}
@OverrIDe
protected String doInBACkground(Object... objects) {
//requesTing for the response from the Google places API
mMap = (GoogleMap) objects[0];
try {
URL myUrl = new URL(url);
httpURLConnection httpURLConnection = (httpURLConnection) myUrl.openConnection();
is = httpURLConnection.geTinputStream();
bufferedReader = new BufferedReader(new inputStreamReader(is));
String line = "";
StringBuilder = new StringBuilder();
while ((line = bufferedReader.readline()) != null) {
StringBuilder.append(linE);
}
//Receiving the data from Json
data = StringBuilder.toString();
} catch (MalformedURLException E) {
e.printstacktrace();
} catch (IOException E) {
e.printstacktrace();
}
return data;
}
@OverrIDe
protected voID onPostExecute(String s) {
try {
JsONObject parentObject = new JsONObject(s);
JsONArray resultArray = parentObject.getJsONArray("results");
for (int i = 0; i < resultArray.length(); i++) {
JsONObject JsonObject = resultArray.getJsONObject(i);
JsONObject LOCATIOnObject = JsonObject.getJsONObject("geometry").getJsONObject("LOCATIOn");
String latitude = JsonObject.getString("lat");
String longitude = JsonObject.getString("lng");
JsONObject nameObject = resultArray.getJsONObject(i);
String nameRestaurant = nameObject.getString("name");
String vicinity = nameObject.getString("vicinity");
LatLng latLng = new LatLng(Double.parseDouble(latitudE),Double.parseDouble(longitudE));
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.title(vicinity);
markerOptions.position(latLng);
mMap.addMarker(markerOptions);
}
} catch (JsONException E) {
e.printstacktrace();
}
super.onPostExecute(s);
}
}
我已成功获取用户的当前位置，但无法找到从当前位置查找附近餐馆的解决方案。请帮助摆脱它，因为我在这里被困了 2 天。请告诉我是否还有其他解决方案。谢谢！
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
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