android - android 目前没有成功匹配

Question

我正在尝试更改特定文本的背景颜色，例如这是文本xxxx 0 visible，我想更改0.

这是我的代码

private TextView setTVBenutzername(View view, Question question, int groupPosition) {
        String BenutzerName = question.Benutzername;
        TextView textView = (TextView) view.findViewById(R.id.txtBenutzername);
        textView.setTag(groupPosition);
        textView.setOnClickListener(this.onGroupClickListenerAll);
        textView.setOnLongClickListener(this.onGroupClickListener);
        Integer Bewertungen;
        Bewertungen = question.Bewertungen;
        if (Bewertungen != null) BenutzerName += " " + Bewertungen + "";
        BenutzerName += " " + question.onlineState.getStateString();
        textView.setText(BenutzerName);

        final Spannable spannable = new SpannableString(textView.getText().toString());
        // Setting Foreground color to the entire text to red
        spannable.setSpan(new ForegroundColorSpan(Color.RED),
                0, textView.getText().toString().length(),
                Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

        // Getting the indices of the number (Bewertungen)
        Matcher matcher = Pattern.compile("\\d+").matcher(textView.getText().toString());
        matcher.find();
        int startIndex = matcher.start();
        int endIndex = matcher.end();

        if (question.online && question.onlineState.state > MainActivity.OnlineState.invisible.state) {

            // Setting Foreground color
            spannable.setSpan(new ForegroundColorSpan(context.getResources().getColor(R.color.colorUserOnline)),
                    startIndex, endIndex,
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

            textView.setText(spannable);
            textView.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_online, 0);

        } else {

            // Setting Foreground color
            spannable.setSpan(new ForegroundColorSpan(context.getResources().getColor(R.color.colorUser)),
                    startIndex, endIndex,
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

            textView.setText(spannable);
            textView.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
        }

        return textView;
    }

运行时应用程序崩溃。

错误是

 java.lang.IllegalStateException: No successful match so far
    at java.util.regex.Matcher.ensureMatch(Matcher.java:1116)
    at java.util.regex.Matcher.start(Matcher.java:1158)
    at java.util.regex.Matcher.start(Matcher.java:1130)
    at de.com.limto.limto1.Controls.QuestionsAdapter.setTVBenutzername(QuestionsAdapter.java:1645)
    at de.com.limto.limto1.Controls.QuestionsAdapter.setGroupView(QuestionsAdapter.java:1203)
    at de.com.limto.limto1.Controls.QuestionsAdapter.getGroupView(QuestionsAdapter.java:1156)
    at android.widget.ExpandableListConnector.getView(ExpandableListConnector.java:446)

标签： androidspannable

Answer 1

find()方法返回 aBoolean指示是否match找到 a ，没有match你就不能得到index，所以包裹在里面的if条件，如下所示

if(matcher.find()){
        int startIndex = matcher.start();
        int endIndex = matcher.end();

        if (question.online && question.onlineState.state > MainActivity.OnlineState.invisible.state) {

            // Setting Foreground color
            spannable.setSpan(new ForegroundColorSpan(context.getResources().getColor(R.color.colorUserOnline)),
                    startIndex, endIndex,
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

            textView.setText(spannable);
            textView.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_online, 0);

        } else {

            // Setting Foreground color
            spannable.setSpan(new ForegroundColorSpan(context.getResources().getColor(R.color.colorUser)),
                    startIndex, endIndex,
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

            textView.setText(spannable);
            textView.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
        }
}