[英]Get location info from autocomplete search feature through json object, Android and google map api
我正在構建一個Android應用,用戶可以在其中按位置搜索並保存位置信息。 搜索框具有自動完成功能,因此,無論何時用戶鍵入內容,他實際上都可以在框中找到建議列表。 我在我的搜索框中實現了這一點。 為此,我使用本教程實現了一個單獨的數據適配器。 但是在這里我只能得到一個名稱列表,但在這里我也需要相應的緯度和經度。 我該怎么辦。 這是我在位置視圖文件中的代碼,
LOC= (AutoCompleteTextView) findViewById(R.id.autoCompleteEditText1);
Context ctx=this;
LOC.setAdapter(new com.cuet.csezeroseven.dao.PlacesAutoCompleteAdapter(this,
R.layout.list_item));
這是我使用的數據適配器,
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.content.Context;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.Filterable;
public class PlacesAutoCompleteAdapter extends ArrayAdapter<String> implements
Filterable {
private ArrayList<String> resultList;
private static final String PLACES_API_BASE = "https://maps.googleapis.com/maps/api/place";
private static final String TYPE_AUTOCOMPLETE = "/autocomplete";
private static final String OUT_JSON = "/json";
//do not change this key
private static final String API_KEY = "my_key";
private static final String TAG = "tag";
public PlacesAutoCompleteAdapter(Context context, int textViewResourceId) {
super(context, textViewResourceId);
}
@Override
public int getCount() {
return resultList.size();
}
@Override
public String getItem(int index) {
return resultList.get(index);
}
public static ArrayList<String> autocomplete(String input) {
ArrayList<String> resultList = null;
HttpURLConnection conn = null;
StringBuilder jsonResults = new StringBuilder();
try {
StringBuilder sb = new StringBuilder(PLACES_API_BASE
+ TYPE_AUTOCOMPLETE + OUT_JSON);
sb.append("?sensor=false&key=" + API_KEY);
sb.append("&components=country:us");
sb.append("&input=" + URLEncoder.encode(input, "utf8"));
URL url = new URL(sb.toString());
conn = (HttpURLConnection) url.openConnection();
InputStreamReader in = new InputStreamReader(conn.getInputStream());
// Load the results into a StringBuilder
int read;
char[] buff = new char[1024];
while ((read = in.read(buff)) != -1) {
jsonResults.append(buff, 0, read);
}
} catch (MalformedURLException e) {
Log.e(TAG, "Error processing Places API URL", e);
return resultList;
} catch (IOException e) {
Log.e(TAG, "Error connecting to Places API", e);
return resultList;
} finally {
if (conn != null) {
conn.disconnect();
}
}
try {
// Create a JSON object hierarchy from the results
JSONObject jsonObj = new JSONObject(jsonResults.toString());
JSONArray predsJsonArray = jsonObj.getJSONArray("predictions");
// Extract the Place descriptions from the results
resultList = new ArrayList<String>(predsJsonArray.length());
for (int i = 0; i < predsJsonArray.length(); i++) {
resultList.add(predsJsonArray.getJSONObject(i).getString(
"description"));
}
} catch (JSONException e) {
Log.e(TAG, "Cannot process JSON results", e);
}
return resultList;
}
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults filterResults = new FilterResults();
if (constraint != null) {
// Retrieve the autocomplete results.
resultList = autocomplete(constraint
.toString());
// Assign the data to the FilterResults
filterResults.values = resultList;
filterResults.count = resultList.size();
}
return filterResults;
}
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
if (results != null && results.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
};
return filter;
}
}
這是完全按照本教程編寫的。
從這個Stackoverflow問題開始 ,我想您必須使用第一個中的“引用”來進行另一個查詢。
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