Android edittext视图在文本输入上进行裁剪

public class EditTextFilter implements InputFilter {
    private int maxLength;

    public EditTextFilter(int maxLength) {
        this.maxLength = maxLength;
    }

    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
        // 对输入的文本进行裁剪处理
        int keep = maxLength - (dest.length() - (dend - dstart));
        if (keep <= 0) {
            return "";
        } else if (keep >= end - start) {
            return null; // 保持原样
        } else {
            if (source instanceof Spanned) {
                SpannableStringBuilder sp = new SpannableStringBuilder(source);
                TextUtils.copySpansFrom((Spanned) source, start, end, null, sp, 0);
                return sp.subSequence(start, start + keep);
            } else {
                return source.subSequence(start, start + keep);
            }
        }
    }
}

EditText editText = findViewById(R.id.editText);
int maxLength = 10; // 设置最大长度为10个字符
editText.setFilters(new InputFilter[]{new EditTextFilter(maxLength)});