简介
在Android中提供了两种智能输入框，它们是AutoCompleteTextView、MultiAutoCompleteTextView。它们的功能大致一样，AutoCompleteTextView是从第一个字符就开始联想，而MultiAutoCompleteTextView则可以从指定字符开始联想。 MultiAutoCompleteTextView能够对用户键入的文本进行有效地扩充提示，而不需要用户输入整个内容。（用户输入一部分内容，剩下的部分系统就会给予提示）。使用时，必须提供一个MultiAutoCompleteTextView.Tokenizer用来区分不同的子串。 布局文件中常用属性
- android:completionHint 设置出现在下拉菜单中的提示标题
- android:completionThreshold 设置用户至少输入多少个字符才会显示提示
- android:dropDownHorizontalOffset 下拉菜单于文本框之间的水平偏移。默认与文本框左对齐
- android:dropDownHeight 下拉菜单的高度
- android:dropDownWidth 下拉菜单的宽度
- android:dropDownVerticalOffset 垂直偏移量
代码－Activity
public class MainActivity extends Activity { private AutoCompleteTextView auto_name; private AutoCompleteTextView auto_mail; private MultiAutoCompleteTextView multi_auto_name; private MultiAutoCompleteTextView multi_auto_mail; private MultiAutoCompleteTextView multi_auto_mail2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); auto_name = (AutoCompleteTextView) findViewById(R.id.auto_name); auto_mail = (AutoCompleteTextView) findViewById(R.id.auto_mail); multi_auto_name = (MultiAutoCompleteTextView) findViewById(R.id.multi_auto_name); multi_auto_mail = (MultiAutoCompleteTextView) findViewById(R.id.multi_auto_mail); multi_auto_mail2 = (MultiAutoCompleteTextView) findViewById(R.id.multi_auto_mail2);
//提示框列表的适配器 String[] string_names = getResources().getStringArray(R.array.strings); String[] mail_paths = new String[] { "@163.com", "@qq.com", "@sina.com", "@hotmail.com", "@gmail.com" }; ArrayAdapter<String> adapterName = new ArrayAdapter<String>(this, R.layout.item_auto_textview, string_names); ArrayAdapter<String> adapterMail = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, mail_paths);
auto_mail.setAdapter(adapterName); auto_name.setAdapter(adapterMail); auto_name.setThreshold(1);//设置输入多少字符后提示，默认值为2个，也可通过android:completionThreshold设置
//对于MultiAutoCompleteTextView，用户必须通过setTokenizer设置一个Tokenizer用来区分不同的子串 multi_auto_name.setTokenizer(new CommaTokenizer()); multi_auto_name.setAdapter(adapterName);
multi_auto_mail.setTokenizer(new CommaTokenizer()); multi_auto_mail.setAdapter(adapterMail); multi_auto_mail2.setTokenizer(new MailBoxAssociateTokenizer()); multi_auto_mail2.setAdapter(adapterMail); } }
public class MainActivity extends Activity {
private AutoCompleteTextView auto_name;
private AutoCompleteTextView auto_mail;
private MultiAutoCompleteTextView multi_auto_name;
private MultiAutoCompleteTextView multi_auto_mail;
private MultiAutoCompleteTextView multi_auto_mail2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
auto_name = (AutoCompleteTextView) findViewById(R.id.auto_name);
auto_mail = (AutoCompleteTextView) findViewById(R.id.auto_mail);
multi_auto_name = (MultiAutoCompleteTextView) findViewById(R.id.multi_auto_name);
multi_auto_mail = (MultiAutoCompleteTextView) findViewById(R.id.multi_auto_mail);
multi_auto_mail2 = (MultiAutoCompleteTextView) findViewById(R.id.multi_auto_mail2);
代码-自定义View
/**
* 自定义的MultiAutoCompleteTextView，实现只要输入到@符，就会开始联想邮箱
*/
public class MailBoxAssociateView extends MultiAutoCompleteTextView {
public MailBoxAssociateView(Context context) {
super(context);
}
public MailBoxAssociateView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MailBoxAssociateView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public boolean enoughToFilter() {
// 如果字符中包含‘@‘并且不在第一位，则满足条件
return getText().toString().contains("@") && getText().toString().indexOf("@") > 0;
}
}
代码-自定义分析器
/**
* 自定义的MultiAutoCompleteTextView的分析器，指定从哪个字符开始联想
*/
public class MailBoxAssociateTokenizer implements Tokenizer {
@Override
public int findTokenEnd(CharSequence text, int cursor) {
int i = cursor;
int len = text.length();
while (i < len) {
if (text.charAt(i) == ‘@‘) {
return i;
} else {
i++;
}
}
return len;
}
@Override
public int findTokenStart(CharSequence text, int cursor) {
int index = text.toString().indexOf("@");
if (index < 0) {
index = text.length();
}
if (index >= findTokenEnd(text, cursor)) {
index = 0;
}
return index;
}
@Override
public CharSequence terminateToken(CharSequence text) {
int i = text.length();
while (i > 0 && text.charAt(i - 1) == ‘ ‘) {
i--;
}
if (i > 0 && text.charAt(i - 1) == ‘@‘) {
return text;
} else {
if (text instanceof Spanned) {
SpannableString sp = new SpannableString(text);
TextUtils.copySpansFrom((Spanned) text, 0, text.length(), Object.class, sp, 0);
return sp;
} else {
return text;
}
}
}
}
布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <AutoCompleteTextView android:id="@+id/auto_name" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="AutoCompleteTextView，老白" android:textColor="#f00" android:textSize="16sp" /> <AutoCompleteTextView android:id="@+id/auto_mail" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="AutoCompleteTextView，邮箱" android:textSize="16sp" /> <MultiAutoCompleteTextView android:id="@+id/multi_auto_name" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="MultiAutoCompleteTextView，老白" android:textSize="16sp" /> <MultiAutoCompleteTextView android:id="@+id/multi_auto_mail" android:layout_width="match_parent" android:layout_height="wrap_content" android:completionThreshold="1" android:hint="MultiAutoCompleteTextView，邮箱" android:textSize="16sp" /> <com.bqt.autotv.MailBoxAssociateView android:id="@+id/multi_auto_mail2" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="自定义的MailBoxAssociateView，非常好用" android:textSize="16sp" /> </LinearLayout>
附件列表
时间： 2024-07-29 00:03:37