Android UI control series: AutoCompleteTextView (automatic prompt)

The function of AutoCompleteTextView is similar to the prompt information that pops up close to the input information when Baidu or Google enters information in the search bar. Of course, some adapters are needed here.

provides two smart input boxes in Android, which are MultiAutoCompleteTextView and AutoCompleteTextView. Their functions are roughly the same. The difference between it and AutoCompleteTextView is that MultiAutoCompleteTextView can always add new selection values ​​​​in the input box. The way of writing is also different, you need to call setTokenizer() after setAdapter. Let’s introduce it in detail below.

1. AutoCompleteTextView

1. Introduction

An editable text view that pops up a prompt when the user enters information. The prompt list appears in a drop-down menu from which the user can select an item to complete their input. The prompt list is data obtained from a data adapter.

2. Important methods

clearListSelection(): Clear the selected list item

dismissDropDown(): Close the drop-down menu if it exists

getAdapter(): Obtain the adapter
3. Creation instructions

(1) Layout file

<AutoCompleteTextView  
 android:id="@+id/edit"  
 android:layout_width="match_parent"  
 android:layout_height="wrap_content" />

(2) Program

Instantiate adapter

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line, strs);

Set up the adapter

edit.setAdapter(adapter);

2. MultiAutoCompleteTextView

1. Introduction

Inherited from AutoCompleteTextView, to extend the length of AutoCompleteTextView, you must provide a MultiAutoCompleteTextView.Tokenizer to distinguish different substrings

2. Important methods

enoughToFilter(): Filter when the text length exceeds the threshold

performValidation(): Instead of validating the entire text, this subclass method validates each individual Text token

setTokenizer(MultiAutoCompleteTextView.Tokenizer t); When the user is typing, the tokenizer setting will be used to determine the relevant range of text
3. Instructions for use

(1) Layout file

<MultiAutoCompleteTextView  
 android:id="@+id/edit1"  
 android:layout_width="match_parent"  
 android:layout_height="wrap_content" />

(2) Program

Instantiate the adapter

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line, strs);

Determine the scope

edit1.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer())

The following is an example

AutoCommitTest.java

package org.hualang.auto;  
  
import android.app.Activity;  
import android.os.Bundle;  
import android.widget.ArrayAdapter;  
import android.widget.AutoCompleteTextView;  
import android.widget.MultiAutoCompleteTextView;  
  
public class AutoCommitTest extends Activity {  
    /** Called when the activity is first created. */  
        private static final String[] autoString=new String[]{"welcome","well",  
                "weatch","weexeview","werap"};  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
        //关联关键字  
        ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,  
                        android.R.layout.simple_dropdown_item_1line,  
                        autoString);  
        AutoCompleteTextView autocomplete=(AutoCompleteTextView)findViewById(R.id.auto);  
        autocomplete.setAdapter(adapter);  
        MultiAutoCompleteTextView multi=(MultiAutoCompleteTextView) findViewById(R.id.multi);  
        //将adapter添加到AutoCompleteTextView中  
        multi.setAdapter(adapter);  
        multi.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());  
    }  
}

main.xml

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    >  
<TextView  
    android:layout_width="fill_parent"  
    android:layout_height="wrap_content"  
    android:text="自动提示功能演示"  
    />  
<AutoCompleteTextView  
        android:id="@+id/auto"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
/>  
<MultiAutoCompleteTextView  
        android:id="@+id/multi"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
/>  
</LinearLayout>

The running results are as follows:

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