在tabHost中嵌套了ActivityGroup的FragmentActivities

Question

我在应用程序中使用FragmentActivities，需要用嵌套的Activities实现TabHost，这些Activities可以在彼此之间切换。我将ActivityGroup用于此目的：

    public class CustomActivityGroup extends ActivityGroup {
View rootView;
public static CustomActivityGroup group;
private ArrayList<View> history;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.history = new ArrayList<View>(); 
    group = this;
      View view = getLocalActivityManager().startActivity("RegisterActivity", new Intent(this,RegisterActivity.class))
      .getDecorView();
      replaceView(view);
}
public void replaceView(View v) {
    history.add(v);
    setContentView(v);
}
public void back() {
    try {
        if (history.size() > 0) {
        history.remove(history.size() - 1);
        if (history.size() > 0) {
            setContentView(history.get(history.size() - 1));
        } else {
            finish();
        }
    } else {
        finish();
    }
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}
public int getHistorySize() {
    return history.size();
}
@Override
public void onBackPressed() {
    try {
        CustomActivityGroup.group.back();
    } catch (Exception ex) {
    }
    return;
}
}

我切换另一个碎片活动，如下所示：

Intent i = new Intent(this, RegisterActivityCompl.class);
        View view = CustomActivityGroup.group.getLocalActivityManager()  
        .startActivity("RegisterActivityCompl", i  
        .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))  
        .getDecorView();  
        // Again, replace the view  
        CustomActivityGroup.group.replaceView(view);

另一个"活动"成功切换，但随后立即切换到初始状态。原因是什么？

Answer 1

我使用本教程解决了我的问题