Android - AutoCompleteTextView only works when backspacing

android, autocompletetextview

Solution

Seems like you really need to implement a filter:

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.Filter;
import android.widget.TextView;

public class TestDoctor extends Activity {

  TextView latText;
  TextView lngText;
  AutoCompleteTextView autoText;
  ArrayAdapter<String> adapter;
  private Filter filter;
  private static final int ADDRESS_TRESHOLD = 10;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.test_doctor);

    latText = (TextView) findViewById(R.id.latTextView);
    lngText = (TextView) findViewById(R.id.longTextView);
    autoText = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView);

    Button button = (Button) findViewById(R.id.buttonDoctor);
    button.setOnClickListener(new Button.OnClickListener() {
      public void onClick(View v) {
        new AdapterUpdaterTask().execute();
      }
    });

    autoText.setThreshold(ADDRESS_TRESHOLD);
    autoText.setHint("Οδός Αριθμός, Περιοχή");

    filter = new Filter() {
      @Override
      protected void publishResults(CharSequence constraint,
          FilterResults results) {
      }

      @Override
      protected FilterResults performFiltering(CharSequence constraint) {
        Log.i("Filter",
            "Filter:" + constraint + " thread: " + Thread.currentThread());
        if (constraint != null && constraint.length() > ADDRESS_TRESHOLD) {
          Log.i("Filter", "doing a search ..");
          new AdapterUpdaterTask().execute();
        }
        return null;
      }
    };

    adapter = new ArrayAdapter<String>(this,
        android.R.layout.simple_dropdown_item_1line) {
      public android.widget.Filter getFilter() {
        return filter;
      }
    };

    autoText.setAdapter(adapter);
    adapter.setNotifyOnChange(false);
  }

  @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;
  }

  private List<SimpleAddress> getAddressesFromText(String address) {
    address = address.replace(' ', '+');
    HttpHelper httpHelper = new HttpHelper();
    InputStream inputStream = httpHelper
        .makeHttpGetRequest("http://maps.google.com/maps/api/geocode/json?address="
            + address + "&sensor=false");
    String response = httpHelper.inputStreamToString(inputStream);

    List<SimpleAddress> simpleAddresses = new ArrayList<SimpleAddress>();
    try {
      JSONObject jsonObject = new JSONObject(response);

      int size = ((JSONArray) jsonObject.get("results")).length();

      for (int i = 0; i < size; i++) {
        String formatted_address = ((JSONArray) jsonObject.get("results"))
            .getJSONObject(i).getString("formatted_address");

        Double lng = ((JSONArray) jsonObject.get("results")).getJSONObject(i)
            .getJSONObject("geometry").getJSONObject("location")
            .getDouble("lng");

        Double lat = ((JSONArray) jsonObject.get("results")).getJSONObject(i)
            .getJSONObject("geometry").getJSONObject("location")
            .getDouble("lat");
        simpleAddresses.add(i, new SimpleAddress(formatted_address, lat, lng));
      }
      return simpleAddresses;
    } catch (JSONException e) {
      return null;
    }
  }

  public class AdapterUpdaterTask extends AsyncTask<Void, Void, Void> {
    List<SimpleAddress> simpleAddresses = new ArrayList<SimpleAddress>();

    @Override
    protected Void doInBackground(Void... voids) {
      Log.i("UPDATE", "1");
      try {
        simpleAddresses = getAddressesFromText(autoText.getText().toString());
      } catch (NullPointerException e) {
      }
      Log.i("UPDATE", "2");
      return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
      Log.i("UPDATE", "3");

      int size = simpleAddresses.size();

      if (size > 0) {
        adapter.clear();
        Log.i("ADAPTER_SIZE", "" + size);
        for (int i = 0; i < size; i++) {
          adapter.add(simpleAddresses.get(i).getFormatted_address());
          Log.i("ADDED", simpleAddresses.get(i).getFormatted_address());
        }
        Log.i("UPDATE", "4");

        adapter.notifyDataSetChanged();
        autoText.showDropDown();

      }
      super.onPostExecute(aVoid);
    }
  }

}

Problem

I have an `AutoCompleteTextView` that dynamically updates the list of suggestions as the user types. My problem is that as I type the list gets updated but the drop-down isn't shown! But when I delete a character (backspace) the drop-down shows up! I even tried to explicitly call the `autoText.showDropDown();` after the text change but it doesn't work. Here is my `TextChangedListener`: ``` private TextWatcher textChecker = new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) { } @Override public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) { if(autoText.length()>9){ new GeoTask().execute(); } } @Override public void afterTextChanged(Editable editable) { if(autoText.length()>9){ autoText.showDropDown(); Log.i("UPDATE","showDropDown"); } } }; ``` I even tried resetting the adapter above the `autoText.showDropDown();` but still nothing: ``` autoText.setAdapter(null); autoText.setAdapter(adapter); ``` Is there a way to get it to work? EDIT: Here is the complete code of the activity. Perhaps someone can find what i am doing wrong... ``` public class TestDoctor extends Activity { TextView latText; TextView lngText; AutoCompleteTextView autoText; ArrayAdapter<String> adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.test_doctor); latText = (TextView) findViewById(R.id.latTextView); lngText = (TextView) findViewById(R.id.longTextView); autoText = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView); Button button = (Button) findViewById(R.id.buttonDoctor); button.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { new GeoTask().execute(); } }); autoText.setThreshold(10); autoText.setHint("Οδός Αριθμός, Περιοχή"); adapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line); autoText.setAdapter(adapter); adapter.setNotifyOnChange(true); autoText.addTextChangedListener(textChecker); } private TextWatcher textChecker = new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3){} @Override public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) { if(autoText.length()>9){ new GeoTask().execute(); } } @Override public void afterTextChanged(Editable editable) {} }; @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; } private List<SimpleAddress> getAddressesFromText(String address) { address = address.replace(' ', '+'); HttpHelper httpHelper = new HttpHelper(); InputStream inputStream = httpHelper.makeHttpGetRequest("http://maps.google.com/maps/api/geocode/json?address=" + address + "&sensor=false"); String response = httpHelper.inputStreamToString(inputStream); List<SimpleAddress> simpleAddresses = new ArrayList<SimpleAddress>(); try { JSONObject jsonObject = new JSONObject(response); int size = ((JSONArray) jsonObject.get("results")).length(); for (int i = 0; i<size; i++){ String formatted_address = ((JSONArray) jsonObject.get("results")).getJSONObject(i) .getString("formatted_address"); Double lng = ((JSONArray) jsonObject.get("results")).getJSONObject(i) .getJSONObject("geometry").getJSONObject("location") .getDouble("lng"); Double lat = ((JSONArray) jsonObject.get("results")).getJSONObject(i) .getJSONObject("geometry").getJSONObject("location") .getDouble("lat"); simpleAddresses.add(i,new SimpleAddress(formatted_address,lat,lng)); } return simpleAddresses; } catch (JSONException e) { return null; } } public class GeoTask extends AsyncTask<Void, Void, Void> { List<SimpleAddress> simpleAddresses = new ArrayList<SimpleAddress>(); @Override protected Void doInBackground(Void... voids) { Log.i("UPDATE","1"); try { simpleAddresses = getAddressesFromText(autoText.getText().toString()); } catch (NullPointerException e) { } Log.i("UPDATE","2"); return null; } @Override protected void onPostExecute(Void aVoid) { Log.i("UPDATE", "3"); int size = simpleAddresses.size(); if(size > 0){ adapter.clear(); Log.i("ADAPTER_SIZE",""+size); for (int i = 0; i< size; i++){ adapter.add(simpleAddresses.get(i).getFormatted_address()); Log.i("ADDED",simpleAddresses.get(i).getFormatted_address()); } Log.i("UPDATE","4"); autoText.setAdapter(null); autoText.setAdapter(adapter); autoText.showDropDown(); Log.i("UPDATE","showDropDown"); } super.onPostExecute(aVoid); } } } ``` EDIT 2 i tried also this but still it doesn't work. The dropdown shows only when i press the backspace... ``` @Override public void afterTextChanged(Editable editable) { runOnUiThread(updateAdapter); } ``` ... ``` private Runnable updateAdapter = new Runnable() { public void run(){ Log.i("ADAPTER_UPDATE","start"); adapter.notifyDataSetChanged(); autoText.showDropDown(); Log.i("ADAPTER_UPDATE","end"); } }; ``` NOTE The problem is: I type an address. As i type nothing shows up. But i see in the logcat the the adapter is updated. But the dropdown doesn't show. Then when i delete one character the dropdown shows up??!!

Original source