问题
I am trying to build a UI combining both static and dynamic elements. For this, I have divided my activity into fragments - all app navigation is then done by replacing fragments instead of navigating between activities.
In my main activity layout, I am using a FrameLayout
:
<FrameLayout
android:id="@+id/mainframe"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:layout_below="@id/topsection"
android:layout_above="@id/lowersection" />
I have a fragment declared as such:
public class MyFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragmentlayout, container, false);
}
}
Then, in my main activity (which extends FragmentActivity and uses the import android.support.v4.app.FragmentActivity
, I am attempting to load this fragment into the frame layout.
MyFragment myf = new MyFragment();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.add(R.id.mainframe, myf);
transaction.commit();
I have followed this from many other examples, however I am receiving a compiler error on the transaction.add()
command, which nobody else seems to have encountered.
The error I am receiving is: The method add(int, Fragment) in the type FragmentTransaction is not applicable for the arguments (int, MyFragment)
.
Why is this? The MyFragment
class extends Fragment
so I would've thought this would work. What am I doing wrong?
Edit: The imports for my main activity are:
import org.joda.time.DateTime;
import android.app.FragmentTransaction;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
回答1:
Check your imports. Use android.support.v4.app.FragmentTransaction
instead of android.app.FragmentTransaction
.
Furthermore be sure you are using android.support.v4.app.Fragment
and calling getSupportFragmentManager()
. It's easy to miss this calls / imports. Thx to saiful103a with the hint of the FragmentManager.
来源:https://stackoverflow.com/questions/20455416/programmatically-adding-fragment-to-framelayout-in-android