Android AutoCompleteTextView控件实现类似百度搜索提示，限制输入数字长度

Android AutoCompleteTextView 控件实现类似被搜索提示，效果如下

1.首先贴出布局代码 activity_main.xml：

<?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>

2.控件下拉列表项布局文件 main_item_row.xml：

<?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>

3.java 代码实现：MainActivity.java

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);
            }
        }
    };
}