輸入框帶刪除按鈕, 此乃標配, 實現(xiàn)起來方法也很多, 網(wǎng)上開源也很多.

但是, 沒事就喜歡瞎折騰.

上圖說話.

這里寫圖片描述

這里寫圖片描述

只是在原生的基礎(chǔ)上加了擴展. 相對來說入侵非常少, 使用方法和原生的一模一樣.無任何閹割.

完整代碼:

public class ExEditText extends AppCompatEditText {

    Rect clearRect = new Rect();

    public ExEditText(Context context) {
        super(context);
    }

    public ExEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public ExEditText(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        //在不影響默認過濾規(guī)則的情況下,添加Emoji表情過濾
        if ("emoji".equalsIgnoreCase(String.valueOf(getTag()))) {
            final InputFilter[] filters = getFilters();
            final InputFilter[] newFilters = new InputFilter[filters.length + 1];
            System.arraycopy(filters, 0, newFilters, 0, filters.length);
            newFilters[filters.length] = new EmojiFilter();
            setFilters(newFilters);
        }
    }

    @Override
    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
        super.onFocusChanged(focused, direction, previouslyFocusedRect);
        //焦點改變,檢查是否需要顯示刪除按鈕
        checkEdit(focused);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        //用來計算刪除按鈕所在的矩形區(qū)域
        clearRect.set(w - getPaddingRight() - Math.min(w, h), getPaddingTop(), w - getPaddingRight(), Math.min(w, h) - getPaddingBottom());
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        //檢查點擊刪除按鈕區(qū)域,并且當(dāng)前具有焦點
        if (event.getAction() == MotionEvent.ACTION_DOWN && isFocused()) {
            //檢查是否在刪除按鈕矩形區(qū)域,按下
            if (checkClear(event.getX(), event.getY())) {
                //如果當(dāng)前已經(jīng)是空的, 不處理Touch事件,否則清空文本,達到刪除的效果
                if (!TextUtils.isEmpty(getText())) {
                    setText("");
                    return true;
                }
            }
        }
        return super.onTouchEvent(event);
    }

    private void checkEdit(boolean focused) {
        if (TextUtils.isEmpty(getText()) || !focused) {
            setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
        } else {
            //這里才是關(guān)鍵, 用的是原生的方法顯示刪除圖標.
            setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.base_edit_delete, 0);
        }
    }

    //坐標是否在按鈕區(qū)
    private boolean checkClear(float x, float y) {
        return clearRect.contains(((int) x), (int) y);
    }

    @Override
    protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
        super.onTextChanged(text, start, lengthBefore, lengthAfter);
        //時刻檢查一下
        checkEdit(true);
    }
}

Emoji表情過濾:

可能還是有些特殊的Emoji表情,或者字符表情無法過濾, 抱歉;
如果你發(fā)現(xiàn), 請告知, 讓我們一起完善一下, 謝謝!

public class EmojiFilter implements InputFilter {
    Pattern emojiPattern = Pattern.compile("[\ud83c\udc00-\ud83c\udfff]|[\ud83d\udc00-\ud83d\udfff]|[\u2600-\u27ff]",
            Pattern.UNICODE_CASE | Pattern.CASE_INSENSITIVE);
    private int mMax = -1;//默認不過濾長度

    public EmojiFilter() {
    }

    public EmojiFilter(int max) {
        mMax = max;
    }

    /**
     * 檢測是否有emoji表情
     *
     * @param source
     * @return
     */
    public static boolean containsEmoji(CharSequence 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));
    }

    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart,
                               int dend) {
        if (this.emojiPattern.matcher(source).find() || containsEmoji(source)) {
            return "";
        }

        if (mMax != -1) {
            int keep = mMax - (dest.length() - (dend - dstart));
            if (keep <= 0) {
                return "";
            } else if (keep >= end - start) {
                return null; // keep original
            } else {
                keep += start;
                if (Character.isHighSurrogate(source.charAt(keep - 1))) {
                    --keep;
                    if (keep == start) {
                        return "";
                    }
                }
                return source.subSequence(start, keep);
            }
        }

        return source;
    }
}

至此: 文章就結(jié)束了,如有疑問: QQ群 Android:274306954 Swift:399799363 歡迎您的加入.