How to pass the values from multiple strings for insert into a sqlite table using a dbadapter?

On click I want to insert values from 2 strings into a table using a dbadapter class. I am able to insert one string inputparticulars with column name TX_PARTICULARS. But I am unable to insert the 2nd string value into another column named as TX_AMOUNT of the same row.

public long insertTxData(String inputparticulars){         
    SQLiteDatabase db = helper.getWritableDatabase();    
    ContentValues contentvalues = new ContentValues();    
    contentvalues.put(VivzHelper.TX_PARTICULARS,inputparticulars);    
    //contentvalues.put(VivzHelper.TX_AMOUNT, inputamount);        
    contentvalues.put(VivzHelper.TX_DATE, Calendar.DATE);     
    long id = db.insert(VivzHelper.TX_TABLE, null, contentvalues );      
    return id;        
}     

public void  onTxClick(View v)     
{     
    String inputparticulars=particulars.getText().toString();         
    String inputamount=amount.getText().toString();         
    ContentValues contentvalues=new ContentValues();        
    vivzHelper.insertTxData(inputparticulars);
}