auto-scrolling TextView in android to bring text into view

Question

I have a TextView that I\'m dynamically adding text to.

in my main.xml file I have the properties set to make my max lines 19 and scrollbar

Answer 1

// Layout Views
    private TextView mConversationView;
    private ScrollView mConversationViewScroller;

use it either in :

public void onCreate(Bundle savedInstanceState)
{
   //...blabla
   setContentView(R.layout.main); 
   //...blablabla
        mConversationView = (TextView) findViewById(R.id.in);       
        mConversationViewScroller = (ScrollView) findViewById(R.id.scroller);
}

or in "special" method e.g. 

public void initializeChatOrSth(...){
        //...blabla
        mConversationView = (TextView) findViewById(R.id.in);       
        mConversationViewScroller = (ScrollView) findViewById(R.id.scroller);
}

public void addTextToTextView()
{

             //...blablabla some code
                byte[] writeBuf = (byte[]) msg.obj;
          // construct a string from the buffer - i needed this or You can use by"stringing"
                String writeMessage = new String(writeBuf);
                mConversationView.append("\n"+"Me:  " + writeMessage);
                mConversationViewScroller.post(new Runnable()
                {
                    public void run()
                    {
                        mConversationViewScroller.fullScroll(View.FOCUS_DOWN);
                    }
                });
}

this one works fine, also we can maually scroll text to the very top - which is impossible when gravity tag in XML is used.

Of course XML (main) the texview should be nested inside scrollview , e.g: