我一直试图提取goolge地方api照片参考但没有取得任何成功。我想知道是否有人可以帮助我。以下是我的代码：
// KEY Strings
public static String KEY_REFERENCE = "reference"; // id of the place
public static String KEY_NAME = "name"; // name of the place
public static String KEY_VICINITY = "vicinity"; // Place area name
public static String KEY_PHOTO = "photo_reference";
class LoadPlaces extends AsyncTask<String, String, String> {
/**
* getting google places JSON response
* */
protected String doInBackground(String... args) {
// creating Places class object
googlePlaces = new GooglePlaces();
try {
String types = MenuActivity.type;
String keyword = MenuActivity.keyword;
// get nearest places
nearPlaces = googlePlaces.search(gps.getLatitude(),gps.getLongitude(),
types, keyword);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed Places into LISTVIEW
* */
// Get JSON response status
String status = nearPlaces.status;
// Check for OK status
if (status.equals("OK")) {
// Successfully got places details
if (nearPlaces.results != null) {
// loop through each place
for (Place p : nearPlaces.results) {
HashMap<String, String> map = new HashMap<String, String>();
map.put(KEY_REFERENCE, p.reference);
map.put(KEY_NAME, p.name);
map.put(KEY_PHOTO,p.photo);
map.put(KEY_VICINITY, p.vicinity);
// adding HashMap to ArrayList
placesListItems.add(map);
}
// list adapter - removed rating
ListAdapter adapter = new SimpleAdapter(
MainActivity.this, placesListItems,
R.layout.list_item, new String[] {
KEY_REFERENCE, KEY_NAME, KEY_VICINITY, KEY_PHOTO},
new int[] { R.id.reference, R.id.name, R.id.address, R.id.phptp});
// Adding data into ListView
lv.setAdapter(adapter);
}
}
}
以下是执行搜索并解析数据的代码：
public class GooglePlaces {
/** Global instance of the HTTP transport. */
private static final HttpTransport HTTP_TRANSPORT = new NetHttpTransport();
private static final String LOG_KEY = "GGPlace";
// Google API Key
private static final String API_KEY = "";
// Google Places serach
private static final String PLACES_SEARCH_URL = "https://maps.googleapis.com/maps/api/place/nearbysearch/json?&rankby=distance";
private double _latitude;
private double _longitude;
private double _radius;
private String address;
public PlacesList search(double latitude, double longitude, String types, String keyword)
throws Exception {
this._latitude = latitude;
this._longitude = longitude;
try {
HttpRequestFactory httpRequestFactory = createRequestFactory(HTTP_TRANSPORT);
HttpRequest request = httpRequestFactory.buildGetRequest(new GenericUrl(PLACES_SEARCH_URL));
request.getUrl().put("key", API_KEY);
request.getUrl().put("location", _latitude + "," + _longitude);
request.getUrl().put("sensor", "true");
if(types != null)
{
request.getUrl().put("types", types);
request.getUrl().put("keyword", keyword);
}
PlacesList list = request.execute().parseAs(PlacesList.class);
// Check log cat for places response status
Log.d("Places Status", "" + list.status);
return list;
} catch (HttpResponseException e) {
Log.e("Error:", e.getMessage());
return null;
}
}
public static HttpRequestFactory createRequestFactory(
final HttpTransport transport) {
return transport.createRequestFactory(new HttpRequestInitializer() {
public void initialize(HttpRequest request) {
GoogleHeaders headers = new GoogleHeaders();
headers.setApplicationName("APP NAME");
headers.gdataVersion="2";
request.setHeaders(headers);
JsonHttpParser parser = new JsonHttpParser(new JacksonFactory());
request.addParser(parser);
}
});
}
}
这是我的PlaceList类：
public class PlacesList implements Serializable {
@Key
public String status;
@Key
public List<Place> results;
}
这是我的Place课程：
public class Place implements Serializable {
@Key
public String id;
@Key
public String name;
@Key
public String reference;
@Key
public String vicinity;
@Key
public Geometry geometry;
@Key
public List<Photo> photos;
}
最后我的Photo类：
public class Photo implements Serializable {
@Key
public String photo_reference;
@Key
public int height;
@Key
public int width;
}
我想我正在以错误的方式调用或传递photo_reference。我希望有人可以帮助我。我已经在这方面工作了几个星期，几乎完全放弃了。
答案 0 :(得分：0)
首先，您的搜索网址错误。
您必须遵循以下格式：
https://developers.google.com/places/web-service/photos
请参阅下面的完整示例：
如果您下载源代码，它将帮助您了解如何在另一个数组中的数组中获取json字符串。
下面的代码段只是回答您需要获取图片的部分：
package in.wptrafficanalyzer.locationnearbyplacesphotos;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class PlaceJSONParser {
/** Receives a JSONObject and returns a list */
public Place[] parse(JSONObject jObject){
JSONArray jPlaces = null;
try {
/** Retrieves all the elements in the 'places' array */
jPlaces = jObject.getJSONArray("results");
} catch (JSONException e) {
e.printStackTrace();
}
/** Invoking getPlaces with the array of json object
* where each json object represent a place
*/
return getPlaces(jPlaces);
}
private Place[] getPlaces(JSONArray jPlaces){
int placesCount = jPlaces.length();
Place[] places = new Place[placesCount];
/** Taking each place, parses and adds to list object */
for(int i=0; i<placesCount;i++){
try {
/** Call getPlace with place JSON object to parse the place */
places[i] = getPlace((JSONObject)jPlaces.get(i));
} catch (JSONException e) {
e.printStackTrace();
}
}
return places;
}
/** Parsing the Place JSON object */
private Place getPlace(JSONObject jPlace){
Place place = new Place();
try {
// Extracting Place name, if available
if(!jPlace.isNull("name")){
place.mPlaceName = jPlace.getString("name");
}
// Extracting Place Vicinity, if available
if(!jPlace.isNull("vicinity")){
place.mVicinity = jPlace.getString("vicinity");
}
if(!jPlace.isNull("photos")){
JSONArray photos = jPlace.getJSONArray("photos");
place.mPhotos = new Photo[photos.length()];
for(int i=0;i<photos.length();i++){
place.mPhotos[i] = new Photo();
place.mPhotos[i].mWidth = ((JSONObject)photos.get(i)).getInt("width");
place.mPhotos[i].mHeight = ((JSONObject)photos.get(i)).getInt("height");
place.mPhotos[i].mPhotoReference = ((JSONObject)photos.get(i)).getString("photo_reference");
JSONArray attributions = ((JSONObject)photos.get(i)).getJSONArray("html_attributions");
place.mPhotos[i].mAttributions = new Attribution[attributions.length()];
for(int j=0;j<attributions.length();j++){
place.mPhotos[i].mAttributions[j] = new Attribution();
place.mPhotos[i].mAttributions[j].mHtmlAttribution = attributions.getString(j);
}
}
}
place.mLat = jPlace.getJSONObject("geometry").getJSONObject("location").getString("lat");
place.mLng = jPlace.getJSONObject("geometry").getJSONObject("location").getString("lng");
} catch (JSONException e) {
e.printStackTrace();
Log.d("EXCEPTION", e.toString());
}
return place;
}
}
答案 1 :(得分：0)
我首先误解了photo_reference为Base64编码字符串。但这并不是从Google Maps API识别和获取照片的参考参数。将此想象为一个令牌参数。因此，要获取最大宽度为400的照片，可以在下面的URL中使用。
有关更多详细信息，请访问Google地方信息文档 https://developers.google.com/places/web-service/photos