incompatible types: HomeFragment cannot be converted to Fragment in Android

Question

I'm getting an error in this part of code:

private void displayView(int position) {
    // update the main content by replacing fragments
    Fragment fragment = null;
    switch (position) {
        case 0:
            fragment = new HomeFragment();
            break;
        case 1:
            fragment =new FindPeopleFragment();
            break;
        case 2:
            fragment = new PhotosFragment();
            break;
        case 3:
            fragment = new CommunityFragment();
            break;
        case 4:
            fragment = new PagesFragment();
            break;
        case 5:
            fragment = new WhatsHotFragment();
            break;

        default:
            break;
    }

    if (fragment != null) {
        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.beginTransaction()
                .replace(R.id.frame_container, fragment).commit();

        // update selected item and title, then close the drawer
        mDrawerList.setItemChecked(position, true);
        mDrawerList.setSelection(position);
        setTitle(navMenuTitles[position]);
        mDrawerLayout.closeDrawer(mDrawerList);
    } else {
        // error in creating fragment
        Log.e("MainActivity", "Error in creating fragment");
    }
}

I get

error: incompatible types: HomeFragment cannot be converted to Fragment

this is the imports:

package liorsiag.lgbt;
import android.app.FragmentManager;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import java.util.ArrayList;

and this is the class title:

public class MainActivity extends FragmentActivity {
    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    private ActionBarDrawerToggle mDrawerToggle;

No matter what I've tried I still get this error

I've tried a lot of navigation drawer tutorials, but none of them seem to work.

Yes, HomeFragment extends Fragment and I've changed FragmentActivity to Activity, yet it doesn't work. — Lior, Nov 20 '14 at 10:57
DrawerLayout also uses fragment, in your case it is using from support.v4 library, and you are also using Fragment of base android sdk (which are not same). Take these as v4.Fragment != android.app.Fragment — Murtaza Khursheed Hussain, Nov 20 '14 at 11:14

score 78 · Accepted Answer · edited Aug 05 '17 at 19:16

78

This seems to be an import problem.

When using getFragmentMangager(), make sure that your Fragment classes extend android.app.Fragment class.

If by any chance you are using android.support.v4.app.Fragment (see your imports), then you need to use getSupportFragmentManager() instead

Hope it helps

edited Aug 05 '17 at 19:16

OneCricketeer

179,855
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answered Nov 20 '14 at 11:00

zozelfelfo

3,776
2
21
35

1

Thank you. But I still have a problem now with this line: `FragmentManager fragmentManager = getSupportFragmentManager();` It Says `Cannot resolve method`. – Lior Nov 20 '14 at 11:19
3

`getSupportFragmentManager()` works if your `Activity` is a `FragmentActivity` if that is not the case, use `getFragmentManager()` – zozelfelfo Nov 20 '14 at 11:27
Tried, yet this line: `fragmentManager.beginTransaction().replace(R.id.frame_container, fragment).commit();` does this problem: `Error:(191, 52) error: incompatible types: android.support.v4.app.Fragment cannot be converted to android.app.Fragment`. – Lior Nov 20 '14 at 11:36
Make sure that `fragment` object is an `android.support.v4.app.Fragment` and not an `android.app.Fragment` – zozelfelfo Nov 20 '14 at 12:12
Made sure, didn't solve the problem... It says the problem is what shows the fragments in the activity_main.xml. Any help? – Lior Nov 20 '14 at 12:46
Change this import `import android.app.FragmentManager;`to `import android.support.v4.app.FragmentManager;` – zozelfelfo Nov 20 '14 at 13:21
Changed it but it says it can't resolve `getSupportFragmentManager()` in `FragmentManager fragmentManager = getSupportFragmentManager();`. – Lior Nov 20 '14 at 14:24
@zozelfelfo can you please help me to solve this https://stackoverflow.com/questions/50046175/fragment-cannot-be-converted-to-context-in-android – Nikson Apr 26 '18 at 14:59

score 10 · Answer 2 · answered Nov 20 '14 at 11:03

10

Try changing

import android.app.Fragment;

to

import android.support.v4.app.Fragment;

Use classes from that support lib for all other imports too. Also getSupportFragmentManager() as mentioned in the other answer.

answered Nov 20 '14 at 11:03

ramuta

260
2
11

score 4 · Answer 3 · edited Aug 22 '16 at 13:24

4

In your HomeFragment class

replace:

import android.app.Fragment;

with:

import android.support.v4.app.Fragment;

edited Aug 22 '16 at 13:24

GhostCat

137,827
25
176
248

answered Mar 08 '15 at 09:52

Ammar Rajab

75
8

score 3 · Answer 4 · edited Aug 22 '16 at 13:25

3

In my case i have changed line-1 with line-2

Line-1: import android.app.Fragment;

Line-2: import android.support.v4.app.Fragment;

Its working

edited Aug 22 '16 at 13:25

Burhanuddin Rashid

5,260
6
34
51

answered Jul 12 '16 at 03:33

Harunduet

937
10
11

score 2 · Answer 5 · edited Apr 09 '17 at 08:09

2

use getSupportFragmentManager() Instead of getFragmentManager()

getSupportFragmentManager()
    .beginTransaction()
    .replace(in.jama.app.R.id.container, new Fragment())
    .commit();

edited Apr 09 '17 at 08:09

OneCricketeer

179,855
19
132
245

answered Mar 22 '17 at 13:16

saigopi.me

14,011
2
83
54

score 2 · Answer 6 · answered Aug 30 '17 at 19:07

2

you just have to import android.support.v4.app.Fragment; in the all the FragmentClass();. that's it.

answered Aug 30 '17 at 19:07

Mehul Raj

21
3

score 1 · Answer 7 · answered May 03 '18 at 07:31

1

In Android Studio 2.3 getSupportFragmentManager works with android.support.v4.app but android studio 3.1 you have to use getFragmentManager enter image description here

answered May 03 '18 at 07:31

Faizan Haidar Khan

1,099
1
15
20

score 0 · Answer 8 · edited May 04 '17 at 08:53

0

import android.app.Fragment; works with getFragmentManager() method but before you have to remove the import android.support.v4.app.Fragment;

edited May 04 '17 at 08:53

Robert

5,278
43
65
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answered May 04 '17 at 08:35

Negatu

1

score 0 · Answer 9 · answered Nov 16 '18 at 04:16

If you are using support library, you should ensure to import both Fragment and FragmentManager from the support library. You will also need to ensure to load the support fragment manager.

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
//other imports here...

public class SomeActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_some);

        FragmentManager fm = getSupportFragmentManager();
        Fragment fragment = fm.findFragmentById(R.id.fragment_container);

        if(fragment == null) {
            fragment = new SomeFragment();
            fm.beginTransaction().add(R.id.fragment_container, fragment).commit();
        }

    }
}

score 0 · Answer 10 · answered Oct 31 '22 at 09:45

0

i having same issue so i updated

implementation 'androidx.appcompat:appcompat:1.2.0'

to

implementation 'androidx.appcompat:appcompat:1.3.0-beta01'

it is working fine now

answered Oct 31 '22 at 09:45

BugsCreator

433
3
10

incompatible types: HomeFragment cannot be converted to Fragment in Android

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