从ArrayAdapter中启动FragmentTransaction [英] Start FragmentTransaction from within ArrayAdapter

问题描述

我有一个带有多个行的ListView.每行都有一个button.

I have a ListView with several rows. Each row has a button.

我希望按钮启动一个FragmentTransaction来替换ListView所在的Fragment.

I want the button to start a FragmentTransaction to replace the Fragment that the ListView is in.

但是，在Adapter的getView()方法中，此行不起作用:

However, in the getView() method of the Adapter, this line does not work:

FragmentTransaction t = getContext().getSupportFragmentManager().beginTransaction();

它不喜欢上下文.

可以通过这种方式完成交易，还是必须在其他地方进行交易?

推荐答案

getSupportFragmentManager()仅为类FragmentActivity定义，而不为Context定义.因此，如果尝试在Context类型的对象上调用该编译器，则编译器将无法解析该调用.

getSupportFragmentManager() is only defined for the class FragmentActivity, not for Context. Thus, the compiler can't resolve the call if you try to call it on an object of type Context.

您可以使用反射来安全地执行此操作.只要您将FragmentActivity作为Context传递，这将始终有效.注意:FragmentActivity是Context的子类，因此您可以在可以传递Context的任何地方传递FragmentActivity.

You can use reflection to do this in a safe way. This will always work as long as you pass your FragmentActivity as the Context. Note: FragmentActivity is a subclass of Context, and thus you can pass FragmentActivity wherever you can pass Context.

因此，请改用以下代码:

So use this code instead:

if (getContext() instanceof FragmentActivity) {
    // We can get the fragment manager
    FragmentActivity activity = (FragmentActivity(getContext()));
    FragmentTransaction t = activity.getSupportFragmentManager().beginTransaction();
}

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