setText() into a textview from a database

Question

I am new to Android App Development. I am try to view my database using a Textview in my activity.

Here is my setText() java

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_viewlogs); 
TextView tv = (TextView) findViewById(R.id.tvSqlinfo);
LogsDB info = new LogsDB(this);
info.open();
ArrayList<String> data = info.getData();
info.close();
tv.setText(data);
}

I seem to be getting and error at tv.setText(data);. Stating "The method setText(CharSequence) in the type TextView is not applicable for the arguments (ArrayList)" Then when i do the recommended fix it changes

tv.setText(data)

to

tv.setText((CharSequence) data);

Then when I test the application I get an error stating that it cannot be cast. What do I need to change to be able to view my database in the textview?

Any advice and help would be greatly appreciated. Thanks

Answer 1

You probably want to take each String out of the ArrayList and add them to a single String object then add that to your TextView . Something like

String text = "These are my database Strings ";
for (int i=0; i<data.size(), i++)
{
    text = text.concat(data.get(i));  // might want to add a space, ",", or some other separator
}
tv.setText(text);

and you can separate the String s however you want them to be displayed.

Answer 2

If you want to keep it simple you can use

tv.setText(data.toString());

instead of

tv.setText(data);

It will show something like this: ([field1],[field2],...)