Why do I get an error while trying to set the content of a tabspec in android?

Question

I have an android activity in which I\'m using tabs.

public class UnitActivity extends TabActivity {
  @Override
  public void onCreate(Bundle savedInstanceS         


        

Answer 1

You also have to use LayoutInflater after TabHost

LayoutInflater.from(this).inflate(R.layout.unit_data, tabHost.getTabContentView(), true);

I also got stuck with this and finally figure it out.

Answer 2

If you have your tab layout in a different file, you have to inflate the XML.

spec = tabHost.newTabSpec("data");
spec.setIndicator("Data");
// Add the layout to your tab view
getLayoutInflater().inflate(R.layout.unit_data, tabHost.getTabContentView(), true);
spec.setContent(R.id.unit_data);   
tabHost.addTab(spec);

Answer 3

While Activity.setContentView takes an id of a Layout, TabSpec.setContent takes an id of a View. This means you need to pass an id that looks like R.id.something and not R.layout.something.

To solve your particular problem, give the top level view in your layout a view id:

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:id="@+id/unit_data">  <!-- NOTE THE CHANGE -->
  ...
</ScrollView>

and update your source:

public class UnitActivity extends TabActivity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.unit_view);

    TabHost tabHost = getTabHost();
    TabSpec spec;

    spec = tabHost.newTabSpec("controls");
    spec.setIndicator("Control");
    spec.setContent(R.id.unit_control);  // NOTE THE CHANGE
    tabHost.addTab(spec);

    spec = tabHost.newTabSpec("data");
    spec.setIndicator("Data");
    spec.setContent(R.id.unit_data);   // NOTE THE CHANGE
    tabHost.addTab(spec);
  }
}

For more information, see the tab examples in the ApiDemos: