不支持表情包的自定义控件NoEmojiEditText

来源：互联网发布：三合一建站系统源码编辑：程序博客网时间：2024/04/27 19:30

public class NoEmojiEditText extends EditText {

private String inputAfterText; // text before input emoji
private boolean resetText; // if reset text

private Context mContext;

public NoEmojiEditText(Context context) {
super(context);
this.mContext = context;
initEditText();
}

public NoEmojiEditText(Context context, AttributeSet attrs) {
super(context, attrs);
this.mContext = context;
initEditText();
}

public NoEmojiEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.mContext = context;
initEditText();
}

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)) {
return true;
}
}
return false;
}

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));
}

private void initEditText() {
addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int before, int count) {
if (!resetText) {
// 这里用s.toString()而不直接用s是因为如果用s，
// 那么，inputAfterText和s在内存中指向的是同一个地址，s改变了，
// inputAfterText也就改变了，那么表情过滤就失败了
inputAfterText = s.toString();
}

}

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (!resetText) {
if (count >= 2) {//表情符号的字符长度最小为2
CharSequence input = s.subSequence(start, start + count);
if (containsEmoji(input.toString())) {
resetText = true;
ToastUtil.showLeToast(mContext, mContext.getString(R.string.unsupport_emoji));
//是表情符号就将文本还原为输入表情符号之前的内容
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) {

}
});
}

}

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