<?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" >    <AutoCompleteTextView        android:id="@+id/autocomplete"        android:layout_width="fill_parent"        android:layout_height="wrap_content" />    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_marginTop="100dp"        android:orientation="horizontal" >        <TextView            android: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" />        <EditText            android: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" >    <TextView        android:id="@+id/brandName"        android:layout_width="fill_parent"        android:layout_height="30dp"        android:textSize="18sp" />    <TextView        android: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;    @Override    public 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() {            @Override            public 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;        @Override        public void beforeTextChanged(CharSequence s, int arg1, int arg2,                int arg3) {            temp = s;        }        @Override        public void onTextChanged(CharSequence s, int arg1, int arg2, int arg3) {        }        @Override        public 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);            }        }    };}