(2)搜索页回退键：

SearchActivity

 @Override
 public void onBackPressed() {
  Log.d(TAG, "onBackPressed");
  Intent intent = new Intent(this, HomeActivity.class);
  Window window = HomeActivityGroup.getInstance()
    .getLocalActivityManager()
    .startActivity(HomeActivity.class.getSimpleName(), intent);
  View view = window.getDecorView();
  HomeActivityGroup.getInstance().setContentView(view);
 }