片段上的onstart()在android中被调用了两次

我有一个活动,其中有一个片段.在片段的onStart()中,我有所有网络调用.当app来自后台时,onStart()被调用两次,所有网络都被调用了两次,我还观察到onCreate()仅被调用了一次,有些人遇到了这样的问题.请帮帮我.
我的片段交易代码如下

 MainFragment myFragment = new MainFragment ();
                FragmentManager fragmentManager = getSupportFragmentManager();
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.content_frame, myFragment, "MyFragment");
                fragmentTransaction.commitAllowingStateLoss();

提前致谢 ！！！

解决方法:

尝试在替换之前检查片段是否已经添加

final FragmentManager fragmentManager = getSupportFragmentManager();
final Fragment content = fragmentManager.findFragmentById(R.id.content_frame);
if (content == null || !(content instanceof MainFragment)) {
    final FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    final MainFragment myFragment = new MainFragment();
    fragmentTransaction.replace(R.id.content_frame, myFragment, "MyFragment");
    fragmentTransaction.commitAllowingStateLoss();
}