在我的应用程序中，我有一个扩展 MapActivity 的 Activity。在那里我放了一个AutoCompleteTextView 和一个名为“搜索”的按钮，所以我在AutoCompleteTextView 中写的内容并按下搜索按钮它会转到谷歌地图中的那个位置。 AutoCompleteTextView 适用于我在 strings.xml 中提到的少量项目。
但我希望它应该用作谷歌搜索引擎，就像在谷歌搜索框中一样，无论我们开始编写它，它都会自动完成那里的每个单词。
事情是它从谷歌服务器获取数据。是不是？
如果是，那么我如何将数据从 Google 服务器绑定到我的 AutoCompleteTextView 以便它用作 Google 搜索框。
我正在使用安卓 API v2.2。
【问题讨论】：
标签： android autocompletetextview
您必须使用 Google Places API，您需要先生成一个地点 API 密钥，查看此页面：
http://code.google.com/apis/maps/documentation/places/
就我而言，我使用了这段代码：
final ArrayAdapter<String> adapter = new ArrayAdapter<String> (this,R.layout.list_item);
AutoCompleteTextView textView = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
adapter.setNotifyOnChange(true);
textView.setAdapter(adapter);
textView.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before, int count) { if (count%3 == 1) { adapter.clear(); try {
URL googlePlaces = new URL(
// URLEncoder.encode(url,"UTF-8");
"https://maps.googleapis.com/maps/api/place/autocomplete/json?input="+ URLEncoder.encode(s.toString(), "UTF-8")
+"&types=geocode&language=fr&sensor=true&key=<getyourAPIkey>");
URLConnection tc = googlePlaces.openConnection();
Log.d("GottaGo", URLEncoder.encode(s.toString()));
BufferedReader in = new BufferedReader(new InputStreamReader(
tc.getInputStream()));
String line;
StringBuffer sb = new StringBuffer();
while ((line = in.readLine()) != null) {
sb.append(line);
}
JSONObject predictions = new JSONObject(sb.toString());
JSONArray ja = new JSONArray(predictions.getString("predictions"));
for (int i = 0; i < ja.length(); i++) {
JSONObject jo = (JSONObject) ja.get(i);
adapter.add(jo.getString("description"));
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} }
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) { // TODO Auto-generated method stub
}
public void afterTextChanged(Editable s) {
} });
【讨论】：
带有谷歌搜索 API 的 AutoCompleteTextView
你的 xml
<AutoCompleteTextView
android:id="@+id/main_omnibox_input"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:background="@null"
android:hint="Search"
android:focusable="true"
android:focusableInTouchMode="true"
android:selectAllOnFocus="true"
android:singleLine="true"
android:textSize="@dimen/_14sdp" />
Activity.java
this.inputBox = (AutoCompleteTextView) findViewById(R.id.main_omnibox_input);
inputBox.setAdapter(new SearchAutocompleteAdapter(SearchActivity.this, new
SearchAutocompleteAdapter.OnSearchCommitListener() {
@Override
public void onSearchCommit(String text) {
inputBox.setText(text);
inputBox.setSelection(text.length());
}
}));
this.inputBox.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> adapterView, View view, int i, long j) {
String charSequence = ((TextView) view.findViewById(android.R.id.text1)).getText().toString();
inputBox.setText(Html.fromHtml(BrowserUnit.urlWrapper(charSequence)), BufferType.SPANNABLE);
inputBox.setSelection(charSequence.length());
// your code
// updateAlbum(charSequence);
// hideSoftInput(SearchActivity.this.inputBox);
}
});
SearchAdapter 看起来像
public class SearchAutocompleteAdapter extends BaseAdapter implements Filterable {
interface OnSearchCommitListener {
void onSearchCommit(String text);
}
private final Context mContext;
private final OnSearchCommitListener commitListener;
private List<String> completions = new ArrayList<>();
static final String searchCompleteUrl = "https://www.google.com/complete/search?client=firefox&q=%s";
SearchAutocompleteAdapter(Context context, OnSearchCommitListener commitListener) {
mContext = context;
this.commitListener = commitListener;
}
@Override
public int getCount() {
return completions.size();
}
@Override
public Object getItem(int position) {
return completions.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@SuppressLint("ClickableViewAccessibility")
@Override
@SuppressWarnings("ConstantConditions")
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(android.R.layout.simple_dropdown_item_1line, parent, false);
}
TextView textview = convertView.findViewById(android.R.id.text1);
textview.setText(completions.get(position));
Drawable d = ContextCompat.getDrawable(mContext, R.drawable.icon_goarrowsmall);
final int size = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 32, mContext.getResources().getDisplayMetrics());
d.setBounds(0, 0, size, size);
textview.setCompoundDrawables(null, null, d, null);
textview.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent event) {
if (event.getAction() != MotionEvent.ACTION_DOWN) {
return false;
}
TextView t = (TextView) view;
if (event.getX() > t.getWidth() - t.getCompoundPaddingRight()) {
commitListener.onSearchCommit(getItem(position).toString());
return true;
}
return false;
}
});
parent.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent event) {
if (event.getX() > view.getWidth() - size * 2) {
return true;
}
return false;
}
});
return convertView;
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
// Invoked on a worker thread
FilterResults filterResults = new FilterResults();
if (constraint != null) {
List<String> results = getCompletions(constraint.toString());
filterResults.values = results;
filterResults.count = results.size();
}
return filterResults;
}
@Override
@SuppressWarnings("unchecked")
protected void publishResults(CharSequence constraint, FilterResults results) {
if (results != null && results.count > 0) {
completions = (List<String>) results.values;
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
};
}
private List<String> getCompletions(String text) {
int total = 0;
byte[] data = new byte[16384];
try {
URL url = new URL(URLUtil.composeSearchUrl(text, searchCompleteUrl, "%s"));
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
try {
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
while (total <= data.length) {
int count = in.read(data, total, data.length - total);
if (count == -1) {
break;
}
total += count;
}
if (total == data.length) {
// overflow
return new ArrayList<>();
}
} finally {
urlConnection.disconnect();
}
} catch (IOException e) {
return new ArrayList<>();
}
JSONArray jsonArray;
try {
jsonArray = new JSONArray(new String(data, StandardCharsets.UTF_8));
} catch (JSONException e) {
return new ArrayList<>();
}
jsonArray = jsonArray.optJSONArray(1);
if (jsonArray == null) {
return new ArrayList<>();
}
final int MAX_RESULTS = 10;
List<String> result = new ArrayList<>(Math.min(jsonArray.length(), MAX_RESULTS));
for (int i = 0; i < jsonArray.length() && result.size() < MAX_RESULTS; i++) {
String s = jsonArray.optString(i);
if (s != null && !s.isEmpty()) {
result.add(s);
}
}
return result;
}
}
【讨论】：