Android FragmentManager之beginTransaction（）

使用：

    private Fragment fragment;private FragmentManager fm;fm = getSupportFragmentManager();fragment = fm.findFragmentById(R.id.fragment_container);fm.beginTransaction().add(R.id.fragment_container, fragment).commit();

beginTransaction源码：

 /*** Start a series of edit operations on the Fragments associated with* this FragmentManager.** <p>Note: A fragment transaction can only be created/committed prior* to an activity saving its state.  If you try to commit a transaction* after {@link FragmentActivity#onSaveInstanceState FragmentActivity.onSaveInstanceState()}* (and prior to a following {@link FragmentActivity#onStart FragmentActivity.onStart}* or {@link FragmentActivity#onResume FragmentActivity.onResume()}, you will get an error.* This is because the framework takes care of saving your current fragments* in the state, and if changes are made after the state is saved then they* will be lost.</p>*/public abstract FragmentTransaction beginTransaction();

add源码：

/*** Calls {@link #add(int, Fragment, String)} with a null tag.*/public abstract FragmentTransaction add(@IdRes int containerViewId, Fragment fragment);

commit源码：

 /*** Schedules a commit of this transaction.  The commit does* not happen immediately; it will be scheduled as work on the main thread* to be done the next time that thread is ready.** <p class="note">A transaction can only be committed with this method* prior to its containing activity saving its state.  If the commit is* attempted after that point, an exception will be thrown.  This is* because the state after the commit can be lost if the activity needs to* be restored from its state.  See {@link #commitAllowingStateLoss()} for* situations where it may be okay to lose the commit.</p>* * @return Returns the identifier of this transaction's back stack entry,* if {@link #addToBackStack(String)} had been called.  Otherwise, returns* a negative number.*/public abstract int commit();

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Android FragmentManager之beginTransaction（）

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