Android EditText 禁止输入表情

来源：互联网发布：java知识产权管理系统编辑：程序博客网时间：2024/04/27 04:07
public class NoEmoJiEditText extends EditText {    //输入表情前的光标位置    private int cursorPos;    //输入表情前EditText中的文本    private String inputAfterText;    //是否重置了EditText的内容    private boolean resetText;    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();    }    private void initEditText() {        addTextChangedListener(new TextWatcher() {            @Override            public void beforeTextChanged(CharSequence s, int start, int before, int count) {                if (!resetText) {                    cursorPos = getSelectionEnd();                    // 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(cursorPos, cursorPos + count);                        if (containsEmoji(input.toString())) {                            resetText = true;                            Toast.makeText(mContext, "不支持输入Emoji表情符号", Toast.LENGTH_SHORT).show();                            //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) {            }        });    }    /**     * 检测是否有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,则该字符是Emoji表情                return true;            }        }        return false;    }    /**     * 判断是否是Emoji     *     * @param codePoint 比较的单个字符     * @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));    }}
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