Android AutoCompleteTextView 示例

Android AutoCompleteTextView 根据保留的单词进行字词补全，因此无需编写单词的所有字符。

Android AutoCompleteTextView是可编辑的文本字段，它在下拉菜单中显示建议列表，用户可以仅选择一个建议或值。

Android AutoCompleteTextView是EditText类的子类。而MultiAutoCompleteTextView是AutoCompleteTextView类的子类。

Android AutoCompleteTextView示例

在此示例中，我们将编程语言显示在自动完成文本视图中。所有的编程语言都存储在字符串数组中。我们使用 ArrayAdapter 类来显示数组内容。

让我们看看Android中autocompletetextview的简单示例。

activity_main.xml

从面板中拖动AutoCompleteTextView和TextView，现在activity_main.xml文件将会是这样的：

<?xml version="1.0" encoding="utf-8"?>  
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    xmlns:app="http://schemas.android.com/apk/res-auto"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    tools:context="example.javatpoint.com.autocompletetextview.MainActivity">  

    <TextView  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:text="What is your favourite programming language?"  
        app:layout_constraintBottom_toBottomOf="parent"  
        app:layout_constraintLeft_toLeftOf="parent"  
        app:layout_constraintRight_toRightOf="parent"  
        app:layout_constraintTop_toTopOf="parent"  
        app:layout_constraintVertical_bias="0.032" />  

    <AutoCompleteTextView  
        android:id="@+id/autoCompleteTextView"  
        android:layout_width="200dp"  
        android:layout_height="wrap_content"  
        android:layout_marginLeft="92dp"  
        android:layout_marginTop="144dp"  
        android:text=""  
        app:layout_constraintStart_toStartOf="parent"  
        app:layout_constraintTop_toTopOf="parent" />  

</android.support.constraint.ConstraintLayout>

Activity类

让我们来编写AutoCompleteTextView的代码。

package example.javatpoint.com.autocompletetextview;

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

public class MainActivity extends AppCompatActivity {
    String[] language ={"C","C++","Java",".NET","iPhone","Android","ASP.NET","PHP"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //Creating the instance of ArrayAdapter containing list of language names
        ArrayAdapter adapter = new ArrayAdapter
                (this,android.R.layout.select_dialog_item,language);
        //Getting the instance of AutoCompleteTextView
        AutoCompleteTextView actv =  (AutoCompleteTextView)findViewById(R.id.autoCompleteTextView);
        actv.setThreshold(1);//will start working from first character
        actv.setAdapter(adapter);//setting the adapter data into the AutoCompleteTextView
        actv.setTextColor(Color.RED);
    }
}