有个小伙伴遇到了这样一个问题，就是AutoCompleteTextView实现自动填充的功能。同时要具备手机格式化的功能。下拉列表最后一行是有个清除历史的功能。可是点击“清除历史”却把文字要设置进去AutoCompleteTextView中。这样的效果显然很糟糕。所以我就写了这样一个简单的demo。来帮助遇到这种问题的朋友解决这样一个问题。二话不多说直接上代码。
布局文件（activity_main.xml）代码如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Please input:" />
<AutoCompleteTextView
android:id="@+id/actv"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
java文件（MainActivity.java）代码如下：
import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.Selection;
import android.text.TextWatcher;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private AutoCompleteTextView mAutoCompleteTextView;
private String[] mAutoStrs = new String[] { "138 0013 8000", "13800138001",
"13800138002", "13800138003", "13800138004", "138 0013 800清除记录" };
private String mBeforeTextChangedStr = "";
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAutoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.actv);
ArrayAdapter<String> _arrayAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_dropdown_item_1line, mAutoStrs);
mAutoCompleteTextView.setAdapter(_arrayAdapter);
mAutoCompleteTextView.setThreshold(1);// 设置输入一个字符就提示
mAutoCompleteTextView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
String _clearStr = "";
if (arg1 instanceof TextView) {
_clearStr = ((TextView) arg1).getText().toString();
}
if (_clearStr.equals("138 0013 800清楚记录")) {
mAutoCompleteTextView.setText(mBeforeTextChangedStr);
Editable _editable = mAutoCompleteTextView.getText();
Selection.setSelection(_editable, _editable.length());
Toast.makeText(MainActivity.this, "清除成功了!",
Toast.LENGTH_LONG).show();
}
}
});
phoneNumAddSpaceOne(mAutoCompleteTextView);
}
/**
* 手机号格式化代码
*
* @param editText
* EditText对象
*/
public void phoneNumAddSpaceOne(final EditText editText) {
editText.addTextChangedListener(new TextWatcher() {
private int start;
private int before;
private StringBuilder stringBuilder;
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
this.start = start;
this.before = before;
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
String _str = s.toString();
if (!isNumeric(_str.replace(" ", ""))) {
return;
}
mBeforeTextChangedStr = _str;
// 手机号格式化xxx xxxx xxxx
if (s == null || s.length() == 0)
return;
if (stringBuilder == null) {
stringBuilder = new StringBuilder();
} else {
stringBuilder.delete(0, stringBuilder.length());
}
for (int i = 0; i < s.length(); i++) {
if (i != 3 && i != 8 && s.charAt(i) == ' ') {
continue;
} else {
stringBuilder.append(s.charAt(i));
if ((stringBuilder.length() == 4 || stringBuilder
.length() == 9)&& stringBuilder.charAt(stringBuilder.length() - 1) != ' ') {
stringBuilder.insert(stringBuilder.length() - 1,' ');
}
}
}
if (!stringBuilder.toString().equals(s.toString())) {
int index = start + 1;
if (stringBuilder.charAt(start) == ' ') {
if (before == 0) {
index++;
} else {
index--;
}
} else {
if (before == 1) {
index--;
}
}
editText.setText(stringBuilder.toString());
editText.setSelection(index);
}
}
});
}
/**
* 判断字符串是否是数字
*
* @param str
* 需要判断的字符串
* @return
*/
public boolean isNumeric(String str) {
for (int i = str.length(); --i >= 0;) {
int chr = str.charAt(i);
if (chr < 48 || chr > 57)
return false;
}
return true;
}
}
