问题代码如下：

public class WikiSuggestActivity extends Activity {

public String data;

public List suggest;

public AutoCompleteTextView autoComplete;

public ArrayAdapter aAdapter;

private static final String TAG = "WikiSuggestActivity";

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

suggest = new ArrayList();

autoComplete = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);

autoComplete.setOnItemClickListener(itemClickListener);

autoComplete.addTextChangedListener(new TextWatcher() {

public void afterTextChanged(Editable editable) {

}

public void beforeTextChanged(CharSequence s, int start, int count,

int after) {

}

public void onTextChanged(CharSequence s, int start, int before,

int count) {

String newText = s.toString();

new getJson().execute(newText);

}

});

}

OnItemClickListener itemClickListener = new OnItemClickListener() {

@Override

public void onItemClick(AdapterView> parent, View view, int position,

long id) {

int key = parent.getId();

Log.d(TAG, "key is " + key + " and R.id.autoCompleteTextView1 is "

+ R.id.autoCompleteTextView1);

switch (key) {

case R.id.autoCompleteTextView1:

Log.d(TAG, "I am magic in place!");

break;

}

}

};

class getJson extends AsyncTask {

@Override

protected void onPostExecute(String result) {

super.onPostExecute(result);

aAdapter = new ArrayAdapter(getApplicationContext(),

android.R.layout.simple_dropdown_item_1line, suggest);

autoComplete.setAdapter(aAdapter);

aAdapter.notifyDataSetChanged();

}

@Override

protected String doInBackground(String... key) {

String newText = key[0];

newText = newText.trim();

newText = newText.replace(" ", "+");

try {

HttpClient hClient = new DefaultHttpClient();

HttpGet hGet = new HttpGet(

"http://en.wikipedia.org/w/api.php?action=opensearch&search="

+ newText + "&limit=8&namespace=0&format=json");

ResponseHandler rHandler = new BasicResponseHandler();

data = hClient.execute(hGet, rHandler);

suggest = new ArrayList();

JSONArray jArray = new JSONArray(data);

for (int i = 0; i < jArray.getJSONArray(1).length(); i++) {

String SuggestKey = jArray.getJSONArray(1).getString(i);

suggest.add(SuggestKey);

}

} catch (Exception e) {

Log.w("Error", e.getMessage());

}

return null;

}

}

}

解决方案：

编写simple_dropdown_item_1line.xml文件

android:id="@+id/text1"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:ellipsize="marquee"

android:gravity="left"

android:paddingBottom="5dip"

android:paddingTop="5dip"

android:singleLine="true"

android:textColor="#ff000000"

android:textSize="22sp" />

修改Java代码

aAdapter = new ArrayAdapter(getApplicationContext(),

android.R.layout.simple_dropdown_item_1line, suggest);为：

aAdapter = new ArrayAdapter(getApplicationContext(),

R.layout.simple_dropdown_item_1line, suggest);