Display variable on-screen using Android by TextViews

I'm having a slight problem trying to display a variable on-screen.

Right now I have a tabbed layout. In the fourth tab there is a nested ActivityGroup which has a mapactivity inside of it.

The trouble is this map activities setContentView is set to R.layout.gps

I am trying to display the distance traveled on-screen ontop or beside the map to show how far the user has travelled.

I can get text to display on-screen by cr开发者_开发技巧eating a text view inside of the XML. However using this method I am unable to link it to a Double variable inside of the activity.

At the same time if I create a TextView t = new TextView(this) it will not be displayed on-screen as the set content is now on it.

If anyone could shed any light on this it would be greatly appreciated.

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Make sure that the TextView you want to use in res/layout/gps.xml has the following in it:

android:id="@+id/mytextview"

And then get use Klaus's code to find your TextView in your Java code:

TextView myTextView = (TextView) findViewById(R.id.mytextview); myTextView.setText("My double value is " + doubleValue);

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Let's assume you have a TextView in your XML with the id of mytextview.

Use:

TextView myTextView = (TextView) findViewById(R.id.mytextview);

to get a dynamic reference to the TextView. Then you can use

myTextView.setText("My double value is " + doubleValue);

to update it as you go along.