How to set a click listener in paragraphs and words?

Question

I have a .txt file inside of my assets folder that has a massive HTML in it...

I call it to a string and set this string as a TextView's text:

InputStream is;
TextView tv;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.my_layout);

    tv = (TextView)findViewById(R.id.tv);

    try {
        is = getAssets().open("html.txt");
        tv.setText(Html.fromHtml(convertStreamToString(is)));
    } catch (Exception e) {
        e.printStackTrace();
    }

}

public static String convertStreamToString(InputStream is) throws Exception {
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    StringBuilder sb = new StringBuilder();
    String line = null;
    while ((line = reader.readLine()) != null) {
        sb.append(line).append("\n");
    }
    reader.close();
    return sb.toString();
}

What I want to achieve is:

• The TextView shows the text like it would show in a browser (I'm using Html.fromHtml to achieve this).

• When a user touches a word from that TextView, the word's background color changes (place a mark on this word and the mark will last even if the application is restarted).

• Give the user an option to mark just the word, or the paragraph the word is in.

For the paragraph marking, I thought I could split the string into paragraphs, make a TextView for each paragraph, and set a click listener on it, to change the whole TextView's color...

For the words, I couldn't find any way to achieve that, except to split the HTML string into words and make a TextView for each word (the whole HTML has about 4000 words). And about storing the mark, I don't know either.

Could anyone help me please?