Trying to add a fragment to my fragment container

问题:

I have created an xml file called editor.xml which contains a FrameLayout. In my main activity I am trying to add my custom fragment to my FrameLayout.

The error I receive when trying to add my fragment is:

The method add(int, Fragment) in the type FragmentTransaction is not applicable for the arguments (int, editorFrag)

However my editorFrag extends Fragment so I am confused on why this is happening. Below is my code for the files I have mentioned. Any help is appreciated.

Editor.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />

editorFrag.java

public class editorFrag extends Fragment
{
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
        Bundle savedInstanceState) 
    {

        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.newlevel, container, false);
    }
}

MainActivity.java

public class editorActivity extends FragmentActivity
{
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.editor);

        // Check that the activity is using the layout version with the fragment_container FrameLayout
        if(findViewById(R.id.fragment_container) != null)
        {
            // if we are being restored from a previous state, then we dont need to do anything and should
            // return or else we could end up with overlapping fragments.
            if(savedInstanceState != null)
                return;

            // Create an instance of editorFrag
            editorFrag firstFrag = new editorFrag();

            // add fragment to the fragment container layout
            getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, firstFrag);
        }
    } 
}

Answered:

Luksprog answered this problem for me below by telling me to check my imports. Eclipse chose to import the SDK version of Fragment instead of the support version that I needed. Thank you for the help.

回答1:

You forgot to commit() your transaction.

回答2:

You also forgot to call the addtoBackStack() method, otherwise your app closes when you hit the back button.

回答3:

add commit() like this

 getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, firstFrag).commit();