Display Two Fragments at the same time

问题

From FragmentPagerAdapter in case 0 I instantiated fragment A this fragment I wanted to display display two fragments inside frag A. The view is not displaying. MyFragmentPagerAdapter is called by the main class to populate the viewpager.

 MyFragmentPagerAdapter extends FragmentPagerAdapter{

   @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

 View rootView = inflater.inflate(R.layout.main, container, false);
final int MARGIN = 16;
leftFrag = new RoundedColourFragment(con.getResources().getColor(
        R.color.android_green), 1f, MARGIN, MARGIN / 2, MARGIN, MARGIN);
rightFrag = new RoundedColourFragment(con.getResources().getColor(
        R.color.honeycombish_blue), 2f, MARGIN / 2, MARGIN, MARGIN,
        MARGIN);

FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.add(R.id.fragg, leftFrag, "left");
ft.add(R.id.fragg2, rightFrag, "right");
ft.commit();

return rootView;
} 
}

XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

     <FrameLayout 

            android:id="@+id/fragg"
            android:layout_weight="2"
            android:layout_width="0dp"
            android:layout_height="match_parent" />

      <FrameLayout

            android:id="@+id/fragg2"
            android:layout_weight="2"
            android:layout_width="0dp"
            android:layout_height="match_parent" />


<android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
    />
</LinearLayout>

回答1:

If you are going to nest fragments inside of fragments, you have to use getChildFragmentManager() to set up the nested fragments, not getFragmentManager(). getChildFragmentManager() is part of API Level 17, and it is also in the Android Support package's backport of fragments.

来源：https://stackoverflow.com/questions/17970021/display-two-fragments-at-the-same-time