第22章：自动完成文本框AutoCompleteTextView的用法

来源：互联网发布：布艺沙发床价格淘宝编辑：程序博客网时间：2024/06/06 13:22

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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