我对 android Google 地图非常陌生.请看一次，让我知道我在哪里做错了。
ExampleApp.java
package com.example.exampleapp;
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.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater.Filter;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Filterable;
import android.widget.Toast;
public class ExampleApp extends Activity implements OnItemClickListener{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
AutoCompleteTextView autoCompView = (AutoCompleteTextView) findViewById(R.id.autocomplete);
autoCompView.setAdapter(new PlacesAutoCompleteAdapter(this, R.layout.list_item));
}
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
// TODO Auto-generated method stub
String str = (String) arg0.getItemAtPosition(arg2);
Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
}
}
class PlacesAutoCompleteAdapter extends ArrayAdapter<String> implements Filterable {
private ArrayList<String> resultList;
public PlacesAutoCompleteAdapter(Context context, int textViewResourceId) {
super(context, textViewResourceId);
}
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";
private static final String API_KEY = "";
@Override
public int getCount() {
return resultList.size();
}
@Override
public String getItem(int index) {
return resultList.get(index);
}
@Override
public android.widget.Filter getFilter() {
Filter filter = new Filter() {
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;
}
private 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:uk");
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(LOG_TAG, "Error processing Places API URL", e);
return resultList;
} catch (IOException e) {
//Log.e(LOG_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(LOG_TAG, "Cannot process JSON results", e);
}
return resultList;
}
protected void publishResults(CharSequence constraint, FilterResults results) {
if (results != null) {
notifyDataSetChanged();
}
else {
notifyDataSetInvalidated();
}
}
@Override
public boolean onLoadClass(Class arg0) {
// TODO Auto-generated method stub
return false;
}};
return (android.widget.Filter) filter;
}
}
FilterResults.java
package com.example.exampleapp;
import java.util.ArrayList;
public class FilterResults {
protected ArrayList<String> values;
protected int count;
}
i write the above code but the application closed .please see once and let me know where i am doing mistake in the above code ?
Thanks in Advance..........