<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical" ><AutoCompleteTextViewandroid:id="@+id/autocomplete"android:layout_width="fill_parent"android:layout_height="wrap_content" /><LinearLayoutandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_marginTop="100dp"android:orientation="horizontal" ><TextViewandroid:id="@+id/tv"android:layout_width="wrap_content"android:layout_height="wrap_content"android:ellipsize="marquee"android:focusable="true"android:focusableInTouchMode="true"android:marqueeRepeatLimit="marquee_forever"android:scrollHorizontally="true"android:text="Please input the text:"android:textSize="18sp" /><EditTextandroid:id="@+id/ET"android:layout_width="fill_parent"android:layout_height="wrap_content"android:hint="只能输入10位数字"android:inputType="number" /></LinearLayout></LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical" ><TextViewandroid:id="@+id/brandName"android:layout_width="fill_parent"android:layout_height="30dp"android:textSize="18sp" /><TextViewandroid:id="@+id/searchText"android:layout_width="fill_parent"android:layout_height="wrap_content"android:visibility="gone" /></LinearLayout>

package com.example.autocompletetextview;import java.util.ArrayList;
import java.util.HashMap;import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AutoCompleteTextView;
import android.widget.EditText;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;public class MainActivity extends Activity {ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();AutoCompleteTextView autoCompleteTextView;private EditText mEditText;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);addItems();autoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.autocompleteTV);SimpleAdapter notes = new SimpleAdapter(this, list,R.layout.main_item_row, new String[] { "brandSearchText","brandName" }, new int[] { R.id.searchText,R.id.brandName });autoCompleteTextView.setAdapter(notes);autoCompleteTextView.setThreshold(1);autoCompleteTextView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {TextView tv = (TextView) arg1.findViewById(R.id.brandName);autoCompleteTextView.setText(tv.getText().toString() + " ");autoCompleteTextView.setSelection((autoCompleteTextView.getText().toString()).length());}});/** TextWatcher操作 */mEditText = (EditText) findViewById(R.id.ET);mEditText.addTextChangedListener(mTextWatcher);}private void addItems() {HashMap<String, String> item;item = new HashMap<String, String>();item.put("brandSearchText", "NOKIA nuojiya NJY");item.put("brandName", "诺基亚");list.add(item);item = new HashMap<String, String>();item.put("brandSearchText", "SVMSUN SX sanxing");item.put("brandName", "三星");list.add(item);item = new HashMap<String, String>();item.put("brandSearchText", "SVMSUN SX sanzhi");item.put("brandName", "三只松鼠");list.add(item);item = new HashMap<String, String>();item.put("brandSearchText", "摩托罗拉  moto MTLL motuoluola motoloar");item.put("brandName", "摩托罗拉");list.add(item);}TextWatcher mTextWatcher = new TextWatcher() {private CharSequence temp;private int editStart;private int editEnd;@Overridepublic void beforeTextChanged(CharSequence s, int arg1, int arg2,int arg3) {temp = s;}@Overridepublic void onTextChanged(CharSequence s, int arg1, int arg2, int arg3) {}@Overridepublic void afterTextChanged(Editable s) {editStart = mEditText.getSelectionStart();editEnd = mEditText.getSelectionEnd();if (temp.length() > 10) {Toast.makeText(MainActivity.this, "你输入的字数已经超过了限制！",Toast.LENGTH_SHORT).show();s.delete(editStart - 1, editEnd);int tempSelection = editStart;mEditText.setText(s);mEditText.setSelection(tempSelection);}}};
}