title: TabHost selection tab when Back pressed
body: <p>I have an Android app that uses TabHost. The problem is when I press back button in submenu of tab2 the app go to tab2. i want if Back Pressed, user go to tab 1, Please Help Me, thx
  My TabHost Class :</p>
  
  <pre><code>public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState);
      host = this.getTabHost();
  
  
      host.addTab(host.newTabSpec("one")
              .setIndicator("Home", getResources().getDrawable(R.drawable.home) )
              .setContent(new Intent(this, tab1.class))); 
  
      host.addTab(host.newTabSpec("two")
              .setIndicator("Master", getResources().getDrawable(R.drawable.master_data))
              .setContent(new Intent(this, tab2.class)));
      host.addTab(host.newTabSpec("tree")
              .setIndicator("P.O.S", getResources().getDrawable(R.drawable.pos))
              .setContent(new Intent(this, tab3.class)));
      host.addTab(host.newTabSpec("four")
              .setIndicator("Report", getResources().getDrawable(R.drawable.report))
              .setContent(new Intent(this, tab4.class)));
      host.addTab(host.newTabSpec("five")
              .setIndicator("CSM", getResources().getDrawable(R.drawable.transfer))
              .setContent(new Intent(this, tab5.class)));
  }
  </code></pre>