【1】如果是tabhost中的activity跳到其他的activity，用这篇blog的方法即可

http://blog.sina.com.cn/s/blog_8db8914301010t31.html

【2】如果是tabhost里面的两个activity

那么用以下代码

getTabHost().setOnTabChangedListener(new OnTabChangeListener() {
    public void onTabChanged(String tabId)
    {
           View currentView = getTabHost().getCurrentView();
           if (getTabHost().getCurrentTab() > currentTab)
           {
               currentView.setAnimation( inFromRightAnimation() );
           }
           else
           {
               currentView.setAnimation( outToRightAnimation() );
           }

currentTab = getTabHost().getCurrentTab();
    }
});

public Animation inFromRightAnimation()
{
   Animation inFromRight = new TranslateAnimation(
           Animation.RELATIVE_TO_PARENT, +1.0f,
           Animation.RELATIVE_TO_PARENT, 0.0f,
           Animation.RELATIVE_TO_PARENT, 0.0f,
           Animation.RELATIVE_TO_PARENT, 0.0f);
   inFromRight.setDuration(240);
   inFromRight.setInterpolator(new AccelerateInterpolator());
   return inFromRight;
}

public Animation outToRightAnimation()
{
   Animation outtoLeft = new TranslateAnimation(
           Animation.RELATIVE_TO_PARENT, -1.0f,
           Animation.RELATIVE_TO_PARENT, 0.0f,
           Animation.RELATIVE_TO_PARENT, 0.0f,
           Animation.RELATIVE_TO_PARENT, 0.0f);
   outtoLeft.setDuration(240);
   outtoLeft.setInterpolator(new AccelerateInterpolator());
   return outtoLeft;
}