动态地将片段添加到片段中

Question

我还没有找到一种方法如何动态地将片段添加到现有的动态添加片段中.你知道吗,如果可能的话？

我这样生成片段:

FragmentManager fragMgr = getSupportFragmentManager();
FragmentTransaction xact = fragMgr.beginTransaction();

if(null == fragMgr.findFragmentByTag(FRAG1_TAG)) {
   xact.add(10101010, new DateTime(), FRAG1_TAG); 
}

if(null == fragMgr.findFragmentByTag(FRAG4_TAG)) {
   xact.add(7777, new loginForm(), FRAG4_TAG);

}

xact.commit(); 

如何添加到另一个FRAG4_TAG片段？

EDIT2:

我硬编码它的ID是为了能够在将来使用它(其中ll是我在XML中的linearLayout):

FrameLayout frml4 = (FrameLayout)inflater.inflate(R.layout.frame,null);
frml4.setId(7777);
frml4.setBackgroundColor(Color.YELLOW);

ll.addView(frml4);

Answer 1

我假设您遇到的问题是没有一个膨胀的视图来添加片段,因为原始片段FRAG4_TAG在您尝试添加之前没有被充气.

您可以将足够的信息传递给Arguments中的FRAG4_TAG,让它知道它应该在视图膨胀之后创建并添加一个片段(或者你需要它拥有的所有片段)到onCreateView上...

活动的布局......

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="MyActivity"/>

    <LinearLayout
        android:orientation="vertical"
        android:id="@+id/main_frag_container"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"/>
</LinearLayout>

活动...

public class MyActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        FragmentManager fm = getFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();

        Fragment fragOne = new MyFragment();
        Bundle arguments = new Bundle();
        arguments.putBoolean("shouldYouCreateAChildFragment", true);
        fragOne.setArguments(arguments);
        ft.add(R.id.main_frag_container, fragOne);
        ft.commit();

    }
}

片段的布局......

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="20dp">
    <TextView
        android:id="@+id/text"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Some fragment"/>

    <LinearLayout
        android:orientation="vertical"
        android:id="@+id/frag_container"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"/>
</LinearLayout>

片段......

public class MyFragment extends Fragment {
    @Override
    public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) {
        ViewGroup layout = (ViewGroup) inflater.inflate(R.layout.frag_layout, container, false);

        boolean shouldCreateChild = getArguments().getBoolean("shouldYouCreateAChildFragment");

        if (shouldCreateChild) {
            FragmentManager fm = getFragmentManager();
            FragmentTransaction ft = fm.beginTransaction();

            fm.beginTransaction();
            Fragment fragTwo = new MyFragment();
            Bundle arguments = new Bundle();
            arguments.putBoolean("shouldYouCreateAChildFragment", false);
            fragTwo.setArguments(arguments);
            ft.add(R.id.frag_container, fragTwo);
            ft.commit();

        }

        return layout;
    }
}

此示例介绍了需要将片段动态添加到尚未充气并添加到层次结构中的片段的情况.将片段添加到已经被充气并添加到层次结构中的片段就像​​指定要通过ID添加的目标片段容器一样简单.