Android(安卓)DialogFragment偶发不能清除的问题

对话框现在多用DialogFragment来代替Dialog，在关闭对话框时需要dismiss操作；但如下代码偶发不能dismiss的问题：使用在progress dialog中，发送请求是show，请求完成后dismiss。

public static void show(FragmentManager manager) {DiyDialog dialogFragment = new DiyDialog();try {if (!dialogFragment.isAdded()) {FragmentTransaction fragmentTransaction=manager.beginTransaction();fragmentTransaction.add(dialogFragment, TAG);fragmentTransaction.commitAllowingStateLoss();//manager.executePendingTransactions();}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}@SuppressLint("NewApi")public static void closeDialog(FragmentManager manager) {DiyDialog dialogFragment = (DiyDialog) manager.findFragmentByTag(TAG);if (dialogFragment != null) {dialogFragment.dismissAllowingStateLoss();}}

单步调试时发现，在调用closeDialog时，不能找到此dialogFragment，因此不能正确的做dismiss操作。明明已经show了，怎么找不到呢？查看源码DOC：

/**     * 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.     *     * 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.
     *      * @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();    /**     * Like {@link #commit} but allows the commit to be executed after an     * activity's state is saved.  This is dangerous because the commit can     * be lost if the activity needs to later be restored from its state, so     * this should only be used for cases where it is okay for the UI state     * to change unexpectedly on the user.     */    public abstract int commitAllowingStateLoss();

大概的意思是：安排了一个commit操作，但不会立刻执行。而如下的这个还是也进一步说明了：commit操作被安排在主线程异步执行。如果想要立即执行，执行如下函数将会有效。

/**     * After a {@link FragmentTransaction} is committed with     * {@link FragmentTransaction#commit FragmentTransaction.commit()}, it     * is scheduled to be executed asynchronously on the process's main thread.     * If you want to immediately executing any such pending operations, you     * can call this function (only from the main thread) to do so.  Note that     * all callbacks and other related behavior will be done from within this     * call, so be careful about where this is called from.     *     * @return Returns true if there were any pending transactions to be     * executed.     */    public abstract boolean executePendingTransactions();

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