我有一个以下布局的活动

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="horizontal" >

android:id="@+id/frameLayoutA"

android:layout_width="wrap_content"

android:layout_height="fill_parent"

android:layout_weight="1" >

android:id="@+id/frameLayoutB"

android:layout_width="wrap_content"

android:layout_height="fill_parent"

android:layout_weight="1" >

在onCreate的活动中,我将frameLayoutA中的Fragment_A和Fragment_B加载到frameLayoutB中.

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

fmA=(FrameLayout) findViewById(R.id.frameLayoutA);

fmB=(FrameLayout) findViewById(R.id.frameLayoutB);

fragA=new FragmentA();

fragB=new FragmentB();

fragC=new FragmentC();

addFragmentsInActivity(R.id.frameLayoutA,fragA);

addFragmentsInActivity(R.id.frameLayoutB,fragB);

}

public void addFragmentsInActivity(int id, Fragment fragment)

{

FragmentManager fragmentManager = getFragmentManager();

FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

fragmentTransaction.add(id, fragment);

fragmentTransaction.commit();

}

使用菜单操作,我想在FrameLayoutB中的frameLayoutA和Fragment_C中加载Fragment_B.菜单操作是：

removeFragmentsInActivity(R.id.frameLayoutB,fragB);

addFragmentsInActivity(R.id.frameLayoutB,fragC);

if(!fragB.isAdded()){

Log.e("check", "fragB already removed from frameLayoutB");

removeFragmentsInActivity(R.id.frameLayoutB,fragB);

addFragmentsInActivity(R.id.frameLayoutA,fragB);

}

else{

Log.e("check", "fragB already added");

}

public void removeFragmentsInActivity(int id, Fragment fragment)

{

FragmentManager fragmentManager = getFragmentManager();

FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

fragmentTransaction.remove(fragment);

fragmentTransaction.commit();

}

Fragment_B不显示在frameLayoutA中. frameLayoutA显示Fragment_A.再次单击菜单操作时,将加载Fragment_B.

调试我发现在fragB.isAdded()返回true之后,在fragB.remove()操作完成之后.在第二个菜单操作期间,执行fragB.isAdded()返回false,并执行fragB.add(),并将FragmentB显示在frameLayoutA中.

我明白commit是一个异步操作. isAdded返回true,因为commit是异步的,删除操作commit不会被完成,直到调用fragB.isAdded()为止.是真的吗

请提出解决问题的方法或办法.

问候,

Vibhor