android 到目前为止没有成功的匹配

问题描述

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 的背景颜色。

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),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,R.drawable.ic_online,0);

        } else {

            // Setting Foreground color
            spannable.setSpan(new ForegroundColorSpan(context.getResources().getColor(R.color.colorUser)),0);
        }

        return textView;
    }

运行时应用崩溃。

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)

解决方法

find() 方法返回一个 Boolean 指示是否找到了 match，没有 match 你不能得到 index，所以包裹在 if 中{1}} 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,R.drawable.ic_online,0);

        } else {

            // Setting Foreground color
            spannable.setSpan(new ForegroundColorSpan(context.getResources().getColor(R.color.colorUser)),0);
        }
}