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POScroll not working in AsyncTask
 

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  1. POScroll not working in AsyncTask
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    <p>I am trying to scroll to a substring in a string of 1000 lines. I notice a lag in the scroll and UI thread. So I thought to use a AsyncTask but as its executed I get the text but not scroll. Here is my code</p> <pre><code> private class LongOperation extends AsyncTask&lt;String, Void, String&gt; { @Override protected String doInBackground(String... params) { SharedPreferences score = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()); int chapter_number_bookmark = score.getInt("chapter_number", 89); int verse_number_bookmark = score.getInt("verse_number", 1); GoToFunction(chapter_number_bookmark,verse_number_bookmark); return "Executed"; } @Override protected void onPostExecute(String result) { Toast.makeText(getApplicationContext(), "Executed", Toast.LENGTH_SHORT).show(); } @Override protected void onPreExecute() { } @Override protected void onProgressUpdate(Void... values) {} } </code></pre> <p>The GoToFunction</p> <pre><code>public void GoToFunction(int chapter, int verse) { int scroll_amt; final TextView shw = (TextView) findViewById(R.id.textViewTab); SharedPreferences score = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()); int chapter_number = chapter; int verse_number = verse; String verse_number_str = Integer.toString(verse_number); SQLiteDatabase as = openOrCreateDatabase("/"+Environment.getExternalStorageDirectory().getPath()+"/tamil/verse", MODE_PRIVATE, null); Cursor a = as.rawQuery("select * from verse"+chapter_number, null); a.moveToFirst(); strTitle = a.getString(a.getColumnIndex("title")); final String strContent_book = a.getString(a.getColumnIndex("content")); int number = a.getInt(a.getColumnIndex("dialogues")); tab.setText("\n\n "+strAthi+strTitle+"\n\n "+strVasa+number+"\n\n "+strContent_book); final int offset_dot = strContent_book.indexOf(verse_number_str_dot); final int offset_comma = strContent_book.indexOf(verse_number_str_comma); a.close(); as.close(); if(offset_comma!=-1||offset_dot!=-1) { if(offset_comma==-1||(offset_dot&lt;offset_comma)) { try { Toast.makeText(getApplicationContext(), "Athiyayam : "+ chapter_number +" Verse : "+ verse_number, Toast.LENGTH_LONG).show(); **scroll(offset_dot); //Scroll function** } catch(Exception e) { Log.e("Scroll_comma", "Exception", e); } } else { try { Toast.makeText(getApplicationContext(), "Athiyayam : "+ chapter_number +" Verse :"+ verse_number, Toast.LENGTH_LONG).show(); scroll(offset_comma); } catch(Exception e) { Log.e("Scroll", "Exception", e); } } } else { Toast.makeText(getApplicationContext(), "Not found", Toast.LENGTH_LONG).show(); } } </code></pre> <p>Scroll Function</p> <pre><code>public void scroll(final int a) { final TextView shw = (TextView) findViewById(R.id.textViewTab); try { mScroll.post(new Runnable() { @Override public void run() { int y = shw.getLayout().getLineForOffset(a); // e.g. I want to scroll to line 40 int n = shw.getLayout().getLineTop(y); mScroll.scrollTo(0, n); } }); } catch(Exception e) { Log.e("scroll", "error", e); } } </code></pre> <p>Here I get the text. But the scroll function doesn't get executed. Also I want to do a spinner activity as the bookmark activity starts and finish as it ends which can be done in PreExecute and PostExecute </p>
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