AutoCompleteText有以下基本属性：

android:completionHint-->设置下拉菜单中的提示标题-->对应方法：setCompletionHint(CharSequence)

android:completionHintView-->设置下拉菜单中提示标题的视图

android:completionThreshold-->设置用户至少输入几个字符才会有提示-->对应方法：setThreshold(int)

android:dropDownAnchor-->设置下拉菜单的定位“描点”组件，如果没有指定该属性，将使用该TextView本身作为定位“描点”组件-->对应方法：setDropDownAnchor(int)

android:dropDownHeight-->设置下拉菜单的高度-->对应方法：setDropDownHeight(int)

android:dropDownHorizontalOffset-->设置下拉菜单与文本框之间的水平偏移。默认为与文本框左对齐

andorid:dropDownVerticalOffset-->设置。。。。。。。。。。。。垂直偏移。。。。。。。。紧挨。

android:dropDownWidth-->设置下拉菜单的宽度-->对应放法：setDropDownWidth

android:popupBackground-->设置下拉菜单的背景-->对应方法：setDropDownBackgroundResource(int)

下面我们看个实例：

activity_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:layout_marginTop="5dp"
        android:textColor="#382aff"
        android:textSize="24sp"
        android:layout_gravity="center_horizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/title" />
    <!--指定输入一个字符后提示-->
    <AutoCompleteTextView
        android:id="@+id/auto"
        android:singleLine="true"
        android:completionHint="@string/selectBook"
        android:completionThreshold="1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <MultiAutoCompleteTextView
        android:id="@+id/mAuto"
        android:completionThreshold="1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

MainActivity.java

package cn.edu.hpu.acm.autoCompleteTextViewTest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.MultiAutoCompleteTextView;

public class MainActivity extends AppCompatActivity {
    private AutoCompleteTextView autoCompleteTextView;
    private MultiAutoCompleteTextView multiAutoCompleteTextView;
    private String[] books = new String[]{
            "疯狂Java讲义",
            "疯狂Android讲义",
            "疯狂Ajax讲义",
            "疯狂Workflow讲义"
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        autoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.auto);
        multiAutoCompleteTextView = (MultiAutoCompleteTextView) findViewById(R.id.mAuto);
        //创建一个ArrayAdapter，封装数组
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_dropdown_item_1line,books);
        //设置Adapter
        autoCompleteTextView.setAdapter(adapter);
        multiAutoCompleteTextView.setAdapter(adapter);
        //设置分隔符
        multiAutoCompleteTextView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

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