android EditText highlight multiple words in the text

问题

I have searched some words in the text of a EditText. After some logic, I get the index of these words. The indices are stored in an arrayList>.

Then I used this function to highlight the color of these words.

    public void changeColor(EditText et, ArrayList<ArrayList<Integer>> arr) {
    Spannable wordtoSpan = new SpannableString(et.getText());
    if (arr==null) return;
    for (int i=0; i<arr.size(); i++){
        wordtoSpan.setSpan(new BackgroundColorSpan(Color.BLUE), arr.get(i).get(0),
                arr.get(i).get(1), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        et.setText(wordtoSpan, TextView.BufferType.SPANNABLE);
        System.out.println("i'm changing color now");
    }
}

However, only the first word was highlight even though the loop was executed by the times of number of words. I tried to replace the EditText with TextView, but still only have one word highlight. Can someone help see what's wrong here? Thank you.

回答1:

it seems to be correct, but it is better to replace your code with

public void changeColor(EditText et, ArrayList<ArrayList<Integer>> arr) {
    Spannable wordtoSpan = new SpannableString(et.getText());
    if (arr==null) return;
    for (int i=0; i<arr.size(); i++){
        wordtoSpan.setSpan(new BackgroundColorSpan(Color.BLUE), arr.get(i).get(0),
            arr.get(i).get(1), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        System.out.println("i'm changing color now");
    }
    et.setText(wordtoSpan);
}

if after this changes, your problem remains yet, i think it might be related to your string indices in "arr"

回答2:

I am not sure but it may happen due to the behavior of edit text and textview with for or while loop. You can't achieve such behavior with for loop. I was trying to do the same for a Karaoke app, and was finally able to do this using runnable and handler. Try to use the following code.

   `String text = yourEditText.getText().toString();
    final String[] wordArray = text.split(" ");
    final Handler handler = new Handler();
    final String[] selString = new String[1];
    Runnable runnable = new Runnable() {
        int i=0;
        @Override
        public void run() {
            selString[0] = wordArray[i];
            i++;
            String str =  et.getText().toString().replaceAll(selString[0], "<font color='red'>"+ selString[0] +"</font>");
            ((EditText)et).setText(Html.fromHtml(str), TextView.BufferType.SPANNABLE);
            if(i<wordArray.length)
                handler.postDelayed(this,500);
        }
    };
    handler.post(runnable);`

The code gets the text entered in edit text by user, split it using space, and highlight words one by one with a time gap of 500 milis.

回答3:

That is what i am using.

 public void setHighLightedText(EditText editText, String textToHighlight) {
    String tvt = editText.getText().toString();
    int ofe = tvt.indexOf(textToHighlight, 0);
    Spannable WordtoSpan = new SpannableString(editText.getText());

    for (int ofs = 0; ofs < tvt.length() && ofe != -1; ofs = ofe + 1) {


        ofe = tvt.indexOf(textToHighlight, ofs);
        if (ofe == -1)
            break;
        else {
            WordtoSpan.setSpan(new BackgroundColorSpan(0xFFFFFF00), ofe, ofe + textToHighlight.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            editText.setText(WordtoSpan, TextView.BufferType.SPANNABLE);
        }
    }
}

来源：https://stackoverflow.com/questions/22890075/android-edittext-highlight-multiple-words-in-the-text

标签

java

android

android-edittext