输入框带删除按钮, 此乃标配, 实现起来方法也很多, 网上开源也很多.
但是, 没事就喜欢瞎折腾.
上图说话.
这里写图片描述 这里写图片描述
只是在原生的基础上加了扩展. 相对来说入侵非常少, 使用方法和原生的一模一样.无任何阉割.
完整代码:
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();
//在不影响默认过滤规则的情况下,添加Emoji表情过滤
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);
//焦点改变,检查是否需要显示删除按钮
checkEdit(focused);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//用来计算删除按钮所在的矩形区域
clearRect.set(w - getPaddingRight() - Math.min(w, h), getPaddingTop(), w - getPaddingRight(), Math.min(w, h) - getPaddingBottom());
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//检查点击删除按钮区域,并且当前具有焦点
if (event.getAction() == MotionEvent.ACTION_DOWN && isFocused()) {
//检查是否在删除按钮矩形区域,按下
if (checkClear(event.getX(), event.getY())) {
//如果当前已经是空的, 不处理Touch事件,否则清空文本,达到删除的效果
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 {
//这里才是关键, 用的是原生的方法显示删除图标.
setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.base_edit_delete, 0);
}
}
//坐标是否在按钮区
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);
//时刻检查一下
checkEdit(true);
}
}
Emoji表情过滤:
可能还是有些特殊的Emoji表情,或者字符表情无法过滤, 抱歉;
如果你发现, 请告知, 让我们一起完善一下, 谢谢!
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;//默认不过滤长度
public EmojiFilter() {
}
public EmojiFilter(int max) {
mMax = max;
}
/**
* 检测是否有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,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));
}
@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: 文章就结束了,如有疑问: QQ群 Android:274306954 Swift:399799363 欢迎您的加入.
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