自动完成textview谷歌放置API

我遵循本教程使用谷歌地方api做自动完成textview。 我想要一个自动填充的textview,当我们开始input时,它会自动填写地名。 上面提到的教程正是我所需要的,但它不适合我。 自动填充行动没有发生。有人build议出路吗?

这是主要的活动

public class MainActivity extends Activity { AutoCompleteTextView atvPlaces; PlacesTask placesTask; ParserTask parserTask; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); atvPlaces = (AutoCompleteTextView) findViewById(R.id.atv_places); atvPlaces.setThreshold(1); atvPlaces.addTextChangedListener(new TextWatcher() { @Override public void onTextChanged(CharSequence s, int start, int before, int count) { placesTask = new PlacesTask(); placesTask.execute(s.toString()); } @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { // TODO Auto-generated method stub } @Override public void afterTextChanged(Editable s) { // TODO Auto-generated method stub } }); } /** A method to download json data from url */ private String downloadUrl(String strUrl) throws IOException{ String data = ""; InputStream iStream = null; HttpURLConnection urlConnection = null; try{ URL url = new URL(strUrl); // Creating an http connection to communicate with url urlConnection = (HttpURLConnection) url.openConnection(); // Connecting to url urlConnection.connect(); // Reading data from url iStream = urlConnection.getInputStream(); BufferedReader br = new BufferedReader(new InputStreamReader(iStream)); StringBuilder sb = new StringBuilder(); String line = ""; while( ( line = br.readLine()) != null){ sb.append(line); } data = sb.toString(); br.close(); }catch(Exception e){ Log.d("Exception while downloading url", e.toString()); }finally{ iStream.close(); urlConnection.disconnect(); } return data; } // Fetches all places from GooglePlaces AutoComplete Web Service private class PlacesTask extends AsyncTask<String, Void, String>{ @Override protected String doInBackground(String... place) { // For storing data from web service String data = ""; // Obtain browser key from https://code.google.com/apis/console String key = "key=AIzaSyBB5KBkuA4-qm8QxaXX8FhHqhHsESMdAzI"; String input=""; try { input = "input=" + URLEncoder.encode(place[0], "utf-8"); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } // place type to be searched String types = "types=geocode"; // Sensor enabled String sensor = "sensor=false"; // Building the parameters to the web service String parameters = input+"&"+types+"&"+sensor+"&"+key; // Output format String output = "json"; // Building the url to the web service String url = "https://maps.googleapis.com/maps/api/place/autocomplete/"+output+"?"+parameters; try{ // Fetching the data from we service data = downloadUrl(url); }catch(Exception e){ Log.d("Background Task",e.toString()); } return data; } @Override protected void onPostExecute(String result) { super.onPostExecute(result); // Creating ParserTask parserTask = new ParserTask(); // Starting Parsing the JSON string returned by Web Service parserTask.execute(result); } } /** A class to parse the Google Places in JSON format */ private class ParserTask extends AsyncTask<String, Integer, List<HashMap<String,String>>>{ JSONObject jObject; @Override protected List<HashMap<String, String>> doInBackground(String... jsonData) { List<HashMap<String, String>> places = null; PlaceJSONParser placeJsonParser = new PlaceJSONParser(); try{ jObject = new JSONObject(jsonData[0]); // Getting the parsed data as a List construct places = placeJsonParser.parse(jObject); }catch(Exception e){ Log.d("Exception",e.toString()); } return places; } @Override protected void onPostExecute(List<HashMap<String, String>> result) { String[] from = new String[] { "description"}; int[] to = new int[] { android.R.id.text1 }; // Creating a SimpleAdapter for the AutoCompleteTextView SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), result, android.R.layout.simple_list_item_1, from, to); // Setting the adapter atvPlaces.setAdapter(adapter); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } } 

这是PlaceJSONParser.java

  public class PlaceJSONParser { /** Receives a JSONObject and returns a list */ public List<HashMap<String,String>> parse(JSONObject jObject){ JSONArray jPlaces = null; try { /** Retrieves all the elements in the 'places' array */ jPlaces = jObject.getJSONArray("predictions"); } catch (JSONException e) { e.printStackTrace(); } /** Invoking getPlaces with the array of json object * where each json object represent a place */ return getPlaces(jPlaces); } private List<HashMap<String, String>> getPlaces(JSONArray jPlaces){ int placesCount = jPlaces.length(); List<HashMap<String, String>> placesList = new ArrayList<HashMap<String,String>>(); HashMap<String, String> place = null; /** 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 */ place = getPlace((JSONObject)jPlaces.get(i)); placesList.add(place); } catch (JSONException e) { e.printStackTrace(); } } return placesList; } /** Parsing the Place JSON object */ private HashMap<String, String> getPlace(JSONObject jPlace){ HashMap<String, String> place = new HashMap<String, String>(); String id=""; String reference=""; String description=""; try { description = jPlace.getString("description"); id = jPlace.getString("id"); reference = jPlace.getString("reference"); place.put("description", description); place.put("_id",id); place.put("reference",reference); } catch (JSONException e) { e.printStackTrace(); } return place; } } 

这是CustomAutoCompleteTextView.java

  public class CustomAutoCompleteTextView extends AutoCompleteTextView { public CustomAutoCompleteTextView(Context context, AttributeSet attrs) { super(context, attrs); } /** Returns the place description corresponding to the selected item */ @Override protected CharSequence convertSelectionToString(Object selectedItem) { /** Each item in the autocompetetextview suggestion list is a hashmap object */ HashMap<String, String> hm = (HashMap<String, String>) selectedItem; return hm.get("description"); } } 

这是清单文件

 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.map5" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="18" /> <uses-permission android:name="android.permission.INTERNET"/> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.example.map5.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> 

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