Cannot convert from android.support.v4.app.Fragmen

Question

I'm doing my first Android app, and wanted to get straight into the ICS API. I have so far created an app using an ActionBar, with swipeable tabs using Viewpager and Fragments.

I do however experience some errors that I keep returning to.

Depending on how I implement it, it always keep going back to an "Type mismatch" error: "cannot convert from android.support.v4.app.Fragment to android.app.Fragment". I have tried removing all import references to either, and this error appears when I only use android.support.v4.app.Fragment in TabListener, FragmentActivity and my two Fragments.

The error occurs in my TabListener:

import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.util.Log;

public class TabListener implements ActionBar.TabListener {
    private android.app.Fragment fragment;
    private Activity activity;
    private ViewPager pager;
    private FragmentTransaction ft;

    public TabListener(Activity activity, Fragment fragment, ViewPager pager) {
        this.activity = activity;
        this.fragment = fragment;
        this.pager = pager;
    }

    @Override
    public void onTabSelected(Tab tab, android.app.FragmentTransaction ft){     
        if (fragment == null) {
            ft.add(fragment, null);
        } else {
            ft.attach(fragment);
        }
    }

    @Override
    public void onTabReselected(Tab tab, android.app.FragmentTransaction ft){
        // TODO Auto-generated method stub
    }

    @Override
    public void onTabUnselected(Tab tab, android.app.FragmentTransaction ft){
        // TODO Auto-generated method stub  
    }
}

By removing "android.app.FragmentTransaction ft", replacing it with just "FragmentTransaction ft", the problem goes awawy. Then new problems arise:

The method onTabReselected(ActionBar.Tab, FragmentTransaction) of type TabListener must override or implement a supertype method TabListener.java

The method onTabSelected(ActionBar.Tab, FragmentTransaction) of type TabListener must override or implement a supertype method TabListener.java

The method onTabUnselected(ActionBar.Tab, FragmentTransaction) of type TabListener must override or implement a supertype method TabListener.java

The type TabListener must implement the inherited abstract method ActionBar.TabListener.onTabReselected(ActionBar.Tab, FragmentTransaction) TabListener.java

The type TabListener must implement the inherited abstract method ActionBar.TabListener.onTabSelected(ActionBar.Tab, FragmentTransaction) TabListener.java

The type TabListener must implement the inherited abstract method ActionBar.TabListener.onTabUnselected(ActionBar.Tab, FragmentTransaction) TabListener.java

Whats going on here?

As you may understand, I'm new to Java and Android development. I feel like I'm pretty close, but I'm not able to solve this problem. I don't understand why it want to "convert from android.support.v4.app.Fragment to android.app.Fragment when I'm not even importing android.app.Fragment anywhere.

I guess it's related to using the compatibility package. (Do I have to use this package at all when creating an app for the newest version of the SDK?)

Answer 1

look here:fragmentTransaction.add(R.id.main_container, new HomeFragment()); you add the fragment ,but follow,you use replace() method ,so you should use replace instead of add()

Answer 2

You can remove the support package, and that should solve your problem. It is only needed when you need functions from Android 3.0 and above in apps for earlier versions.
In your case you get both the default Fragments from ICS, and the Fragments from the support package, and if you happen to get objects from the different packages they will not work together.

Short version; You use either an api level above Honecomb or the support package, not both.