[android help] Database insertion taking too much time- android sqlite

I am trying to insert around 2800 records into the sqlite database, it is taking 150 sec, which is way too much! Could anyone please tell how to optimize this insertion.

    public void createVariantEntry(ArrayList> str) {
        InsertHelper ih = new InsertHelper(Database, VARIANT_TABLE_NAME);
        final int varid = ih.getColumnIndex(VARIANT_ID);
        final int varmakeid = ih.getColumnIndex(VARIANT_MAKE_ID);
        final int varmodid = ih.getColumnIndex(VARIANT_MODEL_ID);
        final int varname = ih.getColumnIndex(VARIANT_NAME);
        final int varposteddate = ih.getColumnIndex(VARIANT_POSTED_DATE);               
        for(int i=0;i<1253;i++)
        {           
            ih.prepareForInsert();
            ih.bind(varid, str.get(i).get(0));
            ih.bind(varmakeid, str.get(i).get(1));
            ih.bind(varmodid, str.get(i).get(2));
            ih.bind(varname, str.get(i).get(3));
            ih.bind(varposteddate, str.get(i).get(4));
            ih.execute();
        }                       
        for(int i=1255;i        {               
            ih.prepareForInsert();
            ih.bind(varid, str.get(i).get(0));
            ih.bind(varmakeid, str.get(i).get(1));
            ih.bind(varmodid, str.get(i).get(2));
            ih.bind(varname, str.get(i).get(3));
            ih.bind(varposteddate, str.get(i).get(4));
            ih.execute();
        }           
        ih.close(); 
    }

.

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