我尝试将AutoTextCOmplete显示在我所在位置的近处，我在http://coderzpassion.com/android-working-google-places-api/找到了教程。它是一个很好的教程，在运行时不会出错。当我写2个字母时，我看到了自动文本完成工作的一瞬间，但我无法看到它中的内容，因为它看起来如此之快。因此，当我在AutoTextComplete字段中写入内容并且当我输入＆＃34; space＆＃34;时，它就像我没有返回值。我的键盘上的字符我得到这个错误
java.io.FileNotFoundException：https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=30.7333,76.7794&rankby=distance&name=Jamu＆amp; key = [我把钥匙放在这里] 在adapter.MyPlacesAdapter.getPlaces（MyPlacesAdapter.java:126）
和
java.lang.NullPointerException：尝试调用虚方法＆＃39; java.lang.String java.lang.StringBuffer.toString（）＆＃39;在null对象引用上 在com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream（HttpURLConnectionImpl.java:238）
这就是我的要求
private ArrayList<MyGooglePlaces> getPredictions(String constraint)
{
//pass your current latitude and longitude to find nearby and ranky=distance means places will be found in ascending order
// according to distance
double latitude=30.7333;
double longitude=76.7794;
String API_KEY="My API Key";
String url= "https://maps.googleapis.com/maps/api/place/nearbysearch/json?location="+latitude+","+longitude+"&rankby=distance&name="+constraint+"&key="+API_KEY;
return getPlaces(url);
}
这是完整的适配器代码
import android.content.Context;
import android.text.Html;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Array;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
/**
* Created by coderzpassion on 05/03/16.
*/
public class MyPlacesAdapter extends BaseAdapter implements Filterable {
private LayoutInflater mInflater;
Context con;
ArrayList<MyGooglePlaces> places=new ArrayList<MyGooglePlaces>();
public MyPlacesAdapter(Context context) {
super();
mInflater = LayoutInflater.from(context);
con=context;
}
// get total count of array
@Override
public int getCount() {
return places.size();
}
//get item id
@Override
public long getItemId(int position) {
return position;
}
// get Mygoogleplaces object at given position
@Override
public MyGooglePlaces getItem(int position) {
return places.get(position);
}
//Filter to filter the results
@Override
public Filter getFilter() {
Filter filter=new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results=new FilterResults();
if(constraint!=null)
{
places=getPredictions(constraint.toString());
if(places!=null)
{
results.values=places;
results.count=places.size();
}
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
if (results != null && results.count > 0) {
// The API returned at least one result, update the data.
notifyDataSetChanged();
} else {
// The API did not return any results, invalidate the data set.
notifyDataSetInvalidated();
}
}
};
return filter;
}
// method to get different places nearby search location
private ArrayList<MyGooglePlaces> getPredictions(String constraint)
{
//pass your current latitude and longitude to find nearby and ranky=distance means places will be found in ascending order
// according to distance
double latitude=30.7333;
double longitude=76.7794;
String API_KEY="AIzaSyByodZEsDBTC-J3brJ39JiYTkqbtJhlSKo";
String url= "https://maps.googleapis.com/maps/api/place/nearbysearch/json?location="+latitude+","+longitude+"&rankby=distance&name="+constraint+"&key="+API_KEY;
return getPlaces(url);
}
private ArrayList<MyGooglePlaces> getPlaces(String constraint)
{
//code for API level 23 as httpclient is depricated in API 23
StringBuffer sb=null;
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(constraint);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream in = urlConnection.getInputStream();
InputStreamReader isw = new InputStreamReader(in);
int data = isw.read();
sb=new StringBuffer("");
while (data != -1) {
sb.append((char)data);
//char current = (char) data;
data = isw.read();
// System.out.print(current);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
}
return parseGoogleParse(sb.toString());
}
// method to parse the json returned by googleplaces api
private static ArrayList parseGoogleParse(final String response) {
ArrayList<MyGooglePlaces> temp = new ArrayList();
try {
// make an jsonObject in order to parse the response
JSONObject jsonObject = new JSONObject(response);
// make an jsonObject in order to parse the response
if (jsonObject.has("results")) {
JSONArray jsonArray = jsonObject.getJSONArray("results");
for (int i = 0; i < jsonArray.length(); i++) {
MyGooglePlaces poi = new MyGooglePlaces();
if (jsonArray.getJSONObject(i).has("name")) {
poi.setName(jsonArray.getJSONObject(i).optString("name"));
poi.setRating(jsonArray.getJSONObject(i).optString("rating", " "));
if (jsonArray.getJSONObject(i).has("opening_hours")) {
if (jsonArray.getJSONObject(i).getJSONObject("opening_hours").has("open_now")) {
if (jsonArray.getJSONObject(i).getJSONObject("opening_hours").getString("open_now").equals("true")) {
poi.setOpenNow("YES");
} else {
poi.setOpenNow("NO");
}
}
} else {
poi.setOpenNow("Not Known");
}
if (jsonArray.getJSONObject(i).has("geometry"))
{
if (jsonArray.getJSONObject(i).getJSONObject("geometry").has("location"))
{
if (jsonArray.getJSONObject(i).getJSONObject("geometry").getJSONObject("location").has("lat"))
{
poi.setLatLng(Double.parseDouble(jsonArray.getJSONObject(i).getJSONObject("geometry").getJSONObject("location").getString("lat")), Double.parseDouble(jsonArray.getJSONObject(i).getJSONObject("geometry").getJSONObject("location").getString("lng")));
}
}
}
if (jsonArray.getJSONObject(i).has("vicinity")) {
poi.setVicinity(jsonArray.getJSONObject(i).optString("vicinity"));
}
if (jsonArray.getJSONObject(i).has("types")) {
JSONArray typesArray = jsonArray.getJSONObject(i).getJSONArray("types");
for (int j = 0; j < typesArray.length(); j++) {
poi.setCategory(typesArray.getString(j) + ", " + poi.getCategory());
}
}
}
//if(temp.size()<5)
temp.add(poi);
}
}
} catch (Exception e) {
e.printStackTrace();
return new ArrayList();
}
return temp;
}
// View method called for each row of the result
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// A ViewHolder keeps references to children views to avoid unnecessary calls
// to findViewById() on each row.
ViewHolder holder;
// When convertView is not null, we can reuse it directly, there is no need
// to reinflate it. We only inflate a new View when the convertView supplied
// by ListView is null.
if (convertView == null) {
convertView = mInflater.inflate(R.layout.autocomplete, null);
// Creates a ViewHolder and store references to the two children views
// we want to bind data to.
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.myplaces);
holder.address=(TextView)convertView.findViewById(R.id.address);
// Bind the data efficiently with the holder.
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
// If weren't re-ordering this you could rely on what you set last time
holder.text.setText(Html.fromHtml("<b>"+places.get(position).getName()+"<b>"));
holder.address.setText(places.get(position).getVicinity());
return convertView;
}
// viewholder class to hold adapter views
static class ViewHolder {
TextView text,address;
}
}