Android-如何“启动"或“初始化"活动的片段? [英] Android - How do I "start" or "initialize" a Fragment from an activity?

问题描述

我有一个名为DummyFragment的类，该类扩展了Fragment.

I have a class called DummyFragment that extends Fragment.

public class DummyFragment extends Fragment {

    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        setRetainInstance(true);

        Log.i("myapp","test");
    }
}

现在，在我的父级活动中，我要运行"该片段.

Now, in my parent activity, I want to "run" this fragment.

这是我的FirstActivity.java:

public class FirstActivity {

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_first);

        // How do I run/start my fragment? I want it's onCreate method to fire
        Fragment fraggy = new DummyFragment();
    }
}

如何运行/启动片段?我想触发我的DummyFragment的onCreate方法.

How do I run/start my fragment? I want my DummyFragment's onCreate method to fire.

推荐答案

有很多文档！您所需的一切已经在此处.

There's plenty of documentation! Everything you need is already here.

FragmentManager fragmentManager = getFragmentManager()
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

Fragment fraggy = new DummyFragment();
fragmentTransaction.add(R.id.fragment_container, fraggy);
fragmentTransaction.commit();

当然，您需要在活动布局中使用该容器.

Of course, you'll need the container in you activity layout.

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