java - 如何在android中部分改变文本的颜色

Question

我有一个句子包含要发布到服务器的消息，例如哇!很棒的照片 #superb #pic#111 #222 喜欢这张照片

我想提取 hastags 并使它们着色并保持其余文本不变。

我尝试了以下代码，但没有用。

private void spannableOperationOnHastag() {
        mPostMessage = edPostMessage.getText().toString().trim();
        String strPreHash = null;
        String strHashText = "";
        if (mPostMessage.contains("#")) {
            try {
                int index = mPostMessage.indexOf("#");
                strPreHash = mPostMessage.substring(0, index);
                SpannableString spannableString = new SpannableString(strPreHash);


                String strHashDummy=mPostMessage.substring(index, mPostMessage.length());
                int hashCount= StringUtils.countMatches(strHashDummy, "#"); // check for number of "#" occurrence and run forloop for getting the number of hastags in the string
                int hasIndex=0;
                for (int i = 0; i <hashCount ; i++) {
                    strHashText = strHashText+strHashDummy.substring(hasIndex, strHashDummy.indexOf(' '))+" ";
                    hasIndex =strHashText.indexOf(" "); // updating new space(" ") position in the index variable
                }


                SpannableString spannableStringBlue = new SpannableString(strHashText);
                spannableStringBlue.setSpan(new ForegroundColorSpan(PublishPostActivity.this.getResources().getColor(R.color.blue)), 0, strHashText.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
                edPostMessage.setText(null); // clearing old string
                edPostMessage.append(spannableString); // setting extracted coloured text
                edPostMessage.append(spannableStringBlue);
            } catch (Exception e) {
                Log.d(TAG, "validatePostMessage() called with " + "e = [" + e + "]");
            }
        }
    }

Answer 1

我自己解决了这个问题。我需要它的任何人都可以引用此代码:)

private void spannableOperationOnHastag() throws Exception{
        mPostMessage = edPostMessage.getText().toString()+" "; // extra space for spannable operations
        List<Integer> listStartPos = new ArrayList<>();
        List<Integer> listEndtPos = new ArrayList<>();

        if (mPostMessage.contains("#")){
            for (int i = 0; i < mPostMessage.length(); i++) {
                if (mPostMessage.charAt(i) == '#') {
                    listStartPos.add(i);
                    Log.d(TAG, "startIndex of # = " + i);
                }
            }
            for (int i = 0; i < listStartPos.size(); i++) {
                int endIndex = mPostMessage.indexOf(' ', listStartPos.get(i));
                listEndtPos.add(endIndex);
                Log.d(TAG, "endIndex of # " + (endIndex));
            }
            SpannableString spanned = SpannableString.valueOf(mPostMessage);
            for (int i = 0; i < listStartPos.size(); i++) {
                spanned = new SpannableString(spanned);
                spanned.setSpan(new ForegroundColorSpan(getResources().getColor(R.color.blue)), listStartPos.get(i), listEndtPos.get(i), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                Log.d(TAG, "substring " + mPostMessage.substring(listStartPos.get(i), listEndtPos.get(i) + 1));
            }
            mPostMessage.trim(); // removing extra space.
            edPostMessage.setText(null);
            edPostMessage.setText(spanned);

        }
    }