弹出所有上方的片段后，如何清除EditText? [英] How do I clear EditText after all fragments above it have been popped?

问题描述

在一个Android项目中，我有3个片段，并在用户执行操作时浏览它们.

In an Android project, I have 3 fragments, and I navigate through them during an operation the user does.

FragmentA-> FragmentB-> FragmentC

FragmentA -> FragmentB -> FragmentC

当用户完成操作后，我执行popBackStack返回FragmentA

When the user finishes the operation, I do a popBackStack to return to FragmentA

if(getFragmentManager()!=null)
    if(getFragmentManager().getBackStackEntryCount()>0) {
        getFragmentManager().popBackStack(getFragmentManager()
                    .getBackStackEntryAt(0)
                    .getName(), FragmentManager.POP_BACK_STACK_INCLUSIVE);
    }

我的问题是:

我有一个EditText，用户在其中编写一些文本，并且在调用popBackStack()之后，该片段仍显示文本.

My question is:

I have an EditText, where the user writes some text, and after the call to popBackStack(), the fragment shows with the text still there.

是否有办法知道片段已弹出并重置EditText?

Is there a way to know that the fragment has been popped and reset that EditText?

这是我用来转到下一个屏幕的方法:

This is what I use to go to next screen:

try {
    String backStateName = ((Object) fragment).getClass().getName();
    String fragmentTag = backStateName;

    ft = getSupportFragmentManager().beginTransaction();

    ft.add(R.id.container, fragment, fragmentTag);
    ft.setTransition(FragmentTransaction.TRANSIT_NONE);
    if (addToBackStack)
        ft.addToBackStack(backStateName);
    ft.commit();

} catch (Exception e) {
    Logging.logException(e);
}

推荐答案

使用标记可以轻松完成此操作.

This can be easily done using flags.

这个想法是，当调用popBackStack()时，活动将设置一个标志，FragmentA将在其onResume()中对其进行检查.

The idea is that when the popBackStack() is called, the Activity sets a flag which will be checked by FragmentA in its onResume().

简化步骤:

1. 弹出FragmentC时，请执行以下操作:

1. When popping off FragmentC, do this:

clearEditTextOfA = true;

在FragmentA的onResume()中的

中，执行以下操作:

in onResume() of FragmentA, do this:

if (activityCallback.shouldClearEditText()) {
    editText.setText("");
}

activityCallback是使Fragment与它所放置的Activity通信的接口.请参见

The activityCallback is an interface which lets a Fragment communicate with the Activity it is placed in. See Android Docs.

执行ft.replace()，而不是执行ft.add().

这将使您的片段的onResume()每当它们更改时都会被调用.

This will make the onResume() of your Fragments get called whenever they change.

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