如何在tabgroup中按下后退按钮时启动活动

Question

我是Android新手，任何人都可以告诉我如何在按下后退按钮时刷新活动。我想刷新视图，使标签不会消失。我发布了一个标签组代码。

public class ReviewTabGroup extends ActivityGroup {
     // Keep this in a static variable to make it accessible for all the nested activities, lets them manipulate the view
    public static ReviewTabGroup group;

        // Need to keep track of the history if you want the back-button to work properly, don't use this if your activities requires a lot of memory.
    private ArrayList<View> history;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          this.history = new ArrayList<View>();
          group = ReviewTabGroup.this;
              // Start the root activity withing the group and get its view
          View view = getLocalActivityManager().startActivity("com.example.application.PeopleTab", new  Intent(this,ReviewTab.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)).getDecorView();

              // Replace the view of this ActivityGroup
          replaceView(view);
       }

    public void replaceView(View v) {
                // Adds the old one to history
        history.add(v);
                // Changes this Groups View to the new View.
        setContentView(v);
    }

    public void back() {
        System.out.println(history.size());
        if(history.size() > 1) {
            history.remove(history.size()-1);
            setContentView(history.get(history.size()-1));
        }else {
            finish();
        }
    }

   public void onBackPressed() {
       ReviewTabGroup.group.back();
        return;
    }
}