在Android的地理codeR自动完成 [英] Geocoder autocomplete in android
问题描述
我一直在谷歌上搜索我试图找人有同样的问题,因为我的屁股,没有运气。因此,这里是我的问题:
I've been googling my ass of trying to find someone that are having the same problem as me, without luck. So here's my problem:
我想实现地址的自动完成建议,作为用户类型使用地理codeR Android中一个地方的名字。我想这样的行为大致相同使用combbox JavaScript版本。
I'm trying to implement a autocomplete suggestion of addresses as the user types the name of a place using the geocoder in Android. I want this to behave much the same as the javascript version using a combbox.
我使用的是布局的AutoCompleteTextView,和arrayadapter动态地更新suggestionlist作为用户类型。我已经添加了从什么时候收到onTextChanged()事件调用地理coder.getFromLocationName是使用处理程序调用之前500ms的延迟。如果在500毫秒用户类型的详细信,最后的活动将被取消。我遇到的问题是,建议几乎从未在UI中下拉selectables显示。我得到的地址的建议,但是当我将它们添加到连接到autocomplatetextview适配器他们简单的将不会显示。
I am using a layout with an AutoCompleteTextView, and an arrayadapter to dynamically update the suggestionlist as the user types. I have added a 500ms delay from when the onTextChanged() event is received before a call to the geocoder.getFromLocationName is called using a Handler. If a user types more letter within 500ms, the last event will be cancelled. The problem I am encountering is that the suggestions almost never show up in the UI as selectables in the dropdown. I get the address suggestions, but when I add them to the adapter attached to the autocomplatetextview they simple wont show.
我在一个使用仿真器API级别7上运行这一点,与谷歌的API包括在内。
I'm running this on an emulator using API level 7, with google apis included.
现在一些源$ C $ C来帮助你: 布局:
Now some source code to aid you: The layout:
<LinearLayout android:id="@+id/searchInputLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="6dip"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/searchMessage" />
<EditText android:id="@+id/freetextInput"
android:hint="@string/searchFreetextLabel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@android:drawable/editbox_background" />
<CheckBox android:id="@+id/includeVincinityCheckbox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/includeVincinityLabel"
android:checked="true"
android:onClick="includeVincinityClick" />
<AutoCompleteTextView android:id="@+id/locationInput"
android:hint="@string/locationInputHint"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<Button android:id="@+id/searchButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/searchBtnLabel"
android:onClick="searchBtnClicked" />
</LinearLayout>
我活动的源头code(我省略了$ C $无关C):
The source code of my activity (I've omitted code not relevant):
public class SearchLocationTabActivity extends Activity implements TextWatcher, OnItemSelectedListener {
private static final int MESSAGE_TEXT_CHANGED = 0;
private static final int AUTOCOMPLETE_DELAY = 500;
private static final int THRESHOLD = 3;
private String latitude, longitude;
private List<Address> autoCompleteSuggestionAddresses;
private ArrayAdapter<String> autoCompleteAdapter;
private Handler messageHandler;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.search);
setDefaultKeyMode(DEFAULT_KEYS_SEARCH_LOCAL);
messageHandler = new MyMessageHandler(this, this);
autoCompleteAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, new ArrayList<String>());
autoCompleteAdapter.setNotifyOnChange(false);
AutoCompleteTextView locationinput = (AutoCompleteTextView) findViewById(R.id.locationInput);
locationinput.addTextChangedListener(this);
locationinput.setOnItemSelectedListener(this);
locationinput.setThreshold(THRESHOLD);
locationinput.setAdapter(autoCompleteAdapter);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
messageHandler.removeMessages(MESSAGE_TEXT_CHANGED);
}
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
String value = arg0.toString();
if (!"".equals(value) && value.length() >= THRESHOLD) {
Message msg = Message.obtain(messageHandler, MESSAGE_TEXT_CHANGED, arg0.toString());
messageHandler.sendMessageDelayed(msg, AUTOCOMPLETE_DELAY);
} else {
autoCompleteAdapter.clear();
}
}
@Override
public void afterTextChanged(Editable arg0) {
}
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
if (arg2 < autoCompleteSuggestionAddresses.size()) {
Address selected = autoCompleteSuggestionAddresses.get(arg2);
latitude = Double.toString(selected.getLatitude());
longitude = Double.toString(selected.getLongitude());
}
}
private void notifyResult(List<Address> suggestions) {
latitude = longitude = null;
autoCompleteAdapter.clear();
for (Address a : autoCompleteSuggestionAddresses) {
autoCompleteAdapter.add(a.toString());//TODO: figure out a nice way to display this address in list
}
autoCompleteAdapter.notifyDataSetChanged();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
latitude = longitude = null;
}
private class MyMessageHandler extends Handler {
private Context context;
private AsyncTaskSubscriber subscriber;
public MyMessageHandler(Context context, AsyncTaskSubscriber subscriber) {
this.context = context;
this.subscriber = subscriber;
}
@Override
public void handleMessage(Message msg) {
if (msg.what == MESSAGE_TEXT_CHANGED) {
String enteredText = (String) msg.obj;
try {
autoCompleteSuggestionAddresses = new Geocoder(context).getFromLocationName(enteredText, 10);
notifyResult(response);
} catch (IOException ex) {
Log.e(GeoCoderAsyncTask.class.getName(), "Failed to get autocomplete suggestions", ex);
}
}
}
}
}
任何帮助是非常AP preciated!
Any help is much appreciated!
推荐答案
对于那些谁没有设法去除过滤,这里是我做了什么(还有其他小的修改,但我不认为他们有一定的影响在过滤部分)。这也说明了该项目的点击进行检测,你需要添加一个OnItemClickListener 。
For those who did not managed to remove the filtering, here is what I've done (among other small modifications but I don't think they have an impact on the filtering part). Note also that for a click on one of the item to be detected, you need to add an OnItemClickListener.
autoCompleteAdapter = new ArrayAdapterNoFilter(this, android.R.layout.simple_dropdown_item_1line);
在哪里ArrayAdapterNoFilter从激发了我其他的答案:
public class ArrayAdapterNoFilter extends ArrayAdapter<String> {
public ArrayAdapterNoFilter(Context context, int textViewResourceId) {
super(context, textViewResourceId);
}
private static final NoFilter NO_FILTER = new NoFilter();
/**
* Override ArrayAdapter.getFilter() to return our own filtering.
*/
@Override
public Filter getFilter() {
return NO_FILTER;
}
/**
* Class which does not perform any filtering. Filtering is already done by
* the web service when asking for the list, so there is no need to do any
* more as well. This way, ArrayAdapter.mOriginalValues is not used when
* calling e.g. ArrayAdapter.add(), but instead ArrayAdapter.mObjects is
* updated directly and methods like getCount() return the expected result.
*/
private static class NoFilter extends Filter {
protected FilterResults performFiltering(CharSequence prefix) {
return new FilterResults();
}
protected void publishResults(CharSequence constraint, FilterResults results) {
// Do nothing
}
}
}
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