Android 通过重写EditText,实现最简单的@好友

xiaoxiao2021-02-28  16

4月份的代码,有人要用的话直接粘贴过去用就可以

/* *作者:赵星海 *时间:18/04/23 10:28 *用途:@好友的实现 */ public class MsgEditText extends AppCompatEditText { public MsgEditText(Context context) { super(context); } public MsgEditText(Context context, AttributeSet attrs) { super(context, attrs); } public MsgEditText(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } private StringBuilder builder; /** * 添加一个块,在文字的后面添加 * * @param showText 显示到界面的内容 * @param userId 附加属性,比如用户id,邮件id之类的,如果不需要可以去除掉 */ @SuppressLint("ResourceAsColor") public void addAtSpan(String maskText, String showText, String userId) { builder = new StringBuilder(); if (!TextUtils.isEmpty(maskText)) { //已经添加了@ builder.append(maskText).append(showText).append(" "); } else { builder.append(showText).append(" "); } getText().insert(getSelectionStart(), builder.toString()); SpannableString sps = new SpannableString(getText()); int start = getSelectionEnd() - builder.toString().length() - (TextUtils.isEmpty(maskText) ? 1 : 0); int end = getSelectionEnd(); makeSpan(sps, new UnSpanText(start, end, builder.toString()), userId); setText(sps); setSelection(end); } //获取用户Id列表 public String getUserIdString() { MyTextSpan[] spans = getText().getSpans(0, getText().length(), MyTextSpan.class); StringBuilder builder = new StringBuilder(); for (MyTextSpan myTextSpan : spans) { String realText = getText().toString().substring(getText().getSpanStart(myTextSpan), getText().getSpanEnd(myTextSpan)); String showText = myTextSpan.getShowText(); if (realText.equals(showText)) { builder.append(myTextSpan.getUserId()).append(","); } } if (!TextUtils.isEmpty(builder.toString())) { builder.deleteCharAt(builder.length() - 1); } return builder.toString(); } //生成一个需要整体删除的Span private void makeSpan(Spannable sps, UnSpanText unSpanText, String userId) { MyTextSpan what = new MyTextSpan(unSpanText.returnText, userId); int start = unSpanText.start; int end = unSpanText.end; sps.setSpan(what, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); } @Override protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) { super.onTextChanged(text, start, lengthBefore, lengthAfter); //向前删除一个字符,@后的内容必须大于一个字符,可以在后面加一个空格 if (lengthBefore == 1 && lengthAfter == 0) { MyTextSpan[] spans = getText().getSpans(0, getText().length(), MyTextSpan.class); for (MyTextSpan myImageSpan : spans) { if (getText().getSpanEnd(myImageSpan) == start && !text.toString().endsWith(myImageSpan.getShowText())) { getText().delete(getText().getSpanStart(myImageSpan), getText().getSpanEnd(myImageSpan)); break; } } } } private class MyTextSpan extends MetricAffectingSpan { private String showText; private String userId; public MyTextSpan(String showText, String userId) { this.showText = showText; this.userId = userId; } public String getShowText() { return showText; } public String getUserId() { return userId; } @Override public void updateMeasureState(TextPaint p) { } @Override public void updateDrawState(TextPaint tp) { } } private class UnSpanText { int start; int end; String returnText; UnSpanText(int start, int end, String returnText) { this.start = start; this.end = end; this.returnText = returnText; } } }

 

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