Android UI组件学习——AutoCompleteTextView

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Android UI组件学习

自动完成文本框（AutoCompleteTextView）的功能和用法

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AutoCompleteTextView还派生了一个子类：MultiAutoCompleteTextView，该子类功能与AutoCompleteTextView类似，只是MultiAutoCompleteTextView允许输入多个提示项，用分隔符分隔

使用AutoCompleteTextView和MultiAutoCompleteTextView自动完成文本框

程序清单\layout\main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><AutoCompleteTextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/auto"android:completionHint="请选择您喜欢的图书"android:dropDownHorizontalOffset="10dp"android:completionThreshold="1"/><MultiAutoCompleteTextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/mauto"android:completionThreshold="1"/>
</LinearLayout>

MainActivity.java

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.MultiAutoCompleteTextView;import androidx.annotation.Nullable;public class MainActivity extends Activity {private AutoCompleteTextView autoCompleteTextView;private MultiAutoCompleteTextView multiAutoCompleteTextView;//定义字符串作为提示的文本String[] books = new String[]{"疯狂Java讲义", "疯狂Ajax讲义", "疯狂XML讲义", "疯狂WorkFlow讲义"};@Overridepublic void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);//创建一个ArrayAdapter封装数组ArrayAdapter<String> aa = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, books);autoCompleteTextView = findViewById(R.id.auto);multiAutoCompleteTextView = findViewById(R.id.mauto);autoCompleteTextView.setAdapter(aa);multiAutoCompleteTextView.setAdapter(aa);//为MultiAutoCompleteTextView设置分隔符multiAutoCompleteTextView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());}
}