在開(kāi)發(fā)中可能多處會(huì)用到過(guò)濾Emoji表情符，一般情況下，我們會(huì)通過(guò)EditText的addTextChangedListener()監(jiān)聽(tīng)來(lái)過(guò)濾Emoji表情，但在實(shí)際開(kāi)發(fā)中會(huì)遇到多個(gè)EditText，為了方便使用，我們可以自定義EditText來(lái)實(shí)現(xiàn)，代碼如下：
package com.piesat.dragonfly.ui.view;
import android.content.Context;
import android.text.Editable;
import android.text.Selection;
import android.text.Spannable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.widget.EditText;
import android.widget.Toast;
/**
* @Description EditText限制輸入表情符號(hào)
* @Authour zhoujp
* @Time 2016年11月18日 下午2:09:58
*
*/
public class ContainsEmojiEditText extends EditText {
// 輸入表情前的光標(biāo)位置
private int cursorPos;
// 輸入表情前EditText中的文本
private String inputAfterText;
// 是否重置了EditText的內(nèi)容
private boolean resetText;
private Context mContext;
public ContainsEmojiEditText(Context context) {
super(context);
this.mContext = context;
initEditText();
}
public ContainsEmojiEditText(Context context, AttributeSet attrs) {
super(context, attrs);
this.mContext = context;
initEditText();
}
public ContainsEmojiEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.mContext = context;
initEditText();
}
// 初始化edittext 控件
private void initEditText() {
addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int before, int count) {
if (!resetText) {
cursorPos = getSelectionEnd();
// 這里用s.toString()而不直接用s是因?yàn)槿绻胹，
// 那么，inputAfterText和s在內(nèi)存中指向的是同一個(gè)地址，s改變了，
// inputAfterText也就改變了，那么表情過(guò)濾就失敗了
inputAfterText = s.toString();
}
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (!resetText) {
if (count >= 2) {// 表情符號(hào)的字符長(zhǎng)度最小為2
CharSequence input = s.subSequence(cursorPos, cursorPos + count);
if (containsEmoji(input.toString())) {
resetText = true;
Toast.makeText(mContext, "不支持輸入表情符號(hào)！", Toast.LENGTH_SHORT).show();
// 是表情符號(hào)就將文本還原為輸入表情符號(hào)之前的內(nèi)容
setText(inputAfterText);
CharSequence text = getText();
if (text instanceof Spannable) {
Spannable spanText = (Spannable) text;
Selection.setSelection(spanText, text.length());
}
}
}
} else {
resetText = false;
}
}
@Override
public void afterTextChanged(Editable editable) {
}
});
}
/**
* 檢測(cè)是否有emoji表情
*
* @param source
* @return
*/
public static boolean containsEmoji(String source) {
int len = source.length();
for (int i = 0; i < len; i++) {
char codePoint = source.charAt(i);
if (!isEmojiCharacter(codePoint)) { // 如果不能匹配,則該字符是Emoji表情
return true;
}
}
return false;
}
/**
* 判斷是否是Emoji
*
* @param codePoint
*? ? ? ? ? ? 比較的單個(gè)字符
* @return
*/
private static boolean isEmojiCharacter(char codePoint) {
return (codePoint == 0x0) || (codePoint == 0x9) || (codePoint == 0xA) || (codePoint == 0xD)
|| ((codePoint >= 0x20) && (codePoint <= 0xD7FF)) || ((codePoint >= 0xE000) && (codePoint <= 0xFFFD))
|| ((codePoint >= 0x10000) && (codePoint <= 0x10FFFF));
}
}
