将数据从活动发送到已创建的片段

只需在片段中添加一个您想要接收参数的方法,然后在活动中调用该方法。

活动代码:

片段代码:

您可以通过如下捆绑包传输任何数据:

Bundle bundle = new Bundle();
bundle.putInt(key, value);
your_fragment.setArguments(bundle);

Bundle bundle = this.getArguments();
if (bundle != null) {
        int myInt = bundle.getInt(key, defaultValue);
}

https://developer.android.com/training/basics/fragments/communicating.html

我认为您需要的关键部分是:

ArticleFragment articleFrag = (ArticleFragment)
      getSupportFragmentManager().findFragmentById(R.id.article_fragment);

if (articleFrag != null) {
    // If article frag is available, we're in two-pane layout...

    // Call a method in the ArticleFragment to update its content
    articleFrag.updateArticleView(position);
} else {
    // Otherwise, we're in the one-pane layout and must swap frags...

    // Create fragment and give it an argument for the selected article
    ArticleFragment newFragment = new ArticleFragment();
    Bundle args = new Bundle();
    args.putInt(ArticleFragment.ARG_POSITION, position);
    newFragment.setArguments(args);

    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

    // Replace whatever is in the fragment_container view with this fragment,
    // and add the transaction to the back stack so the user can navigate back
    transaction.replace(R.id.fragment_container, newFragment);
    transaction.addToBackStack(null);

    // Commit the transaction
    transaction.commit();
}

首先尝试通过调用findFragmentById(R.id.fragment\u id)来检索片段,如果它不为null,则可以调用在接口中定义的方法来向其发送一些数据。